mirror of
https://github.com/cesanta/mongoose.git
synced 2024-12-04 01:39:01 +08:00
standardize TM4C baremetal
This commit is contained in:
Sergio R. Caprile
parent
572a10d5a0
commit
6e97905bce
@ -1,24 +1,50 @@
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TARGET = firmware
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ROOT ?= $(realpath $(CURDIR)/../../..)
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CFLAGS ?= -W -Wall -Wextra -Werror -Wundef -Wshadow -Wdouble-promotion \
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-Wformat-truncation -fno-common -Wconversion \
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-g3 -Os -ffunction-sections -fdata-sections -I. -I$(ROOT) \
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-DMG_ARCH=MG_ARCH_NEWLIB -DMIP_DEBUG=1 -DMG_ENABLE_PACKED_FS=1 \
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-DMG_ENABLE_CUSTOM_MILLIS=1 -DxMG_ENABLE_LINES=1 -DMG_ENABLE_TCPIP=1 -DMG_ENABLE_DRIVER_TM4C=1\
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-mcpu=cortex-m4 -mthumb -mfloat-abi=hard -mfpu=fpv4-sp-d16 $(EXTRA_CFLAGS)
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LDFLAGS ?= -Tlink.ld -nostartfiles -nostdlib --specs nano.specs -lc -lgcc -Wl,--gc-sections -Wl,-Map=$@.map
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SOURCES = boot.c main.c syscalls.c \
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$(ROOT)/mongoose.c \
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$(ROOT)/examples/device-dashboard/packed_fs.c \
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$(ROOT)/examples/device-dashboard/net.c
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CFLAGS = -W -Wall -Wextra -Werror -Wundef -Wshadow -Wdouble-promotion
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CFLAGS += -Wformat-truncation -fno-common -Wconversion -Wno-sign-conversion
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CFLAGS += -g3 -Os -ffunction-sections -fdata-sections
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CFLAGS += -I. -Icmsis_core/CMSIS/Core/Include -Icmsis_tm4c/Device/TI/TM4C/Include
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CFLAGS += -mcpu=cortex-m4 -mthumb -mfloat-abi=hard -mfpu=fpv4-sp-d16
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LDFLAGS ?= -Tlink.ld -nostdlib -nostartfiles --specs nano.specs -lc -lgcc -Wl,--gc-sections -Wl,-Map=$@.map
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all build example: $(TARGET).bin
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SOURCES = main.c syscalls.c sysinit.c
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SOURCES += startup.c # startup file. Compiler-dependent!
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$(TARGET).bin: $(TARGET).elf
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# Mongoose-specific source code files and build options. See https://mongoose.ws/documentation/#build-options
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SOURCES += mongoose.c net.c packed_fs.c
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CFLAGS += -DMG_ENABLE_TCPIP=1 -DMG_ARCH=MG_ARCH_NEWLIB -DMG_ENABLE_CUSTOM_MILLIS=1
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CFLAGS += -DMG_ENABLE_DRIVER_TM4C=1 -DMG_ENABLE_PACKED_FS=1 $(CFLAGS_EXTRA)
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ifeq ($(OS),Windows_NT)
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RM = cmd /C del /Q /F /S
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else
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RM = rm -rf
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endif
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all build example: firmware.bin
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firmware.bin: firmware.elf
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arm-none-eabi-objcopy -O binary $< $@
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$(TARGET).elf: $(SOURCES) mcu.h
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firmware.elf: cmsis_core cmsis_tm4c $(SOURCES) hal.h link.ld
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arm-none-eabi-gcc $(SOURCES) $(CFLAGS) $(LDFLAGS) -o $@
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flash: firmware.bin
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@echo "This requires Uniflash"
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cmsis_core: # ARM CMSIS core headers
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git clone --depth 1 -b 5.9.0 https://github.com/ARM-software/CMSIS_5 $@
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cmsis_tm4c: # CMSIS headers for TM4C series
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git clone --depth 1 --no-checkout https://github.com/speters/CMSIS $@ && cd $@ && git sparse-checkout set Device/TI/TM4C && git checkout
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# Automated remote test. Requires env variable VCON_API_KEY set. See https://vcon.io/automated-firmware-tests/
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DEVICE_URL ?= https://dash.vcon.io/api/v3/devices/1
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update: firmware.bin
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curl --fail-with-body -su :$(VCON_API_KEY) $(DEVICE_URL)/ota --data-binary @$<
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test update: CFLAGS_EXTRA += -DUART_DEBUG=UART1
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test: update
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curl --fail-with-body -su :$(VCON_API_KEY) $(DEVICE_URL)/tx?t=5 | tee /tmp/output.txt
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grep 'READY, IP:' /tmp/output.txt # Check for network init
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grep 'MQTT connected' /tmp/output.txt # Check for MQTT connection success
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clean:
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@rm -rf $(TARGET).* *.su
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$(RM) firmware.* *.su cmsis_core cmsis_tm4c
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175
examples/ti/ek-tm4c1294xl-baremetal/hal.h
Normal file
175
examples/ti/ek-tm4c1294xl-baremetal/hal.h
Normal file
@ -0,0 +1,175 @@
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// Copyright (c) 2022 Cesanta Software Limited
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// All rights reserved
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// https://www.ti.com/lit/pdf/spms433
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#pragma once
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#include "TM4C1294NCPDT.h"
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#define BIT(x) (1UL << (x))
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#define SETBITS(R, CLEARMASK, SETMASK) (R) = ((R) & ~(CLEARMASK)) | (SETMASK)
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#define PIN(bank, num) ((bank << 8) | (num))
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#define PINNO(pin) (pin & 255)
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#define PINBANK(pin) pinbank(pin >> 8)
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// This MCU doesn't have GPIOI nor GPIOO
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static inline unsigned int pinbank(unsigned int bank) {
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bank = bank > 'O' ? bank - 2 : bank > 'I' ? bank - 1 : bank;
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return bank - 'A';
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}
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// 5.5, Table 5-12: configure flash (and EEPROM) timing in accordance to clock
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// freq
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enum {
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PLL_CLK = 25,
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PLL_M = 96,
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PLL_N = 5,
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PLL_Q = 1,
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PSYSDIV = 4
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}; // Run at 120 Mhz
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#define PLL_FREQ (PLL_CLK * PLL_M / PLL_N / PLL_Q / PSYSDIV)
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#define FLASH_CLKHIGH 6
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#define FLASH_WAITST 5
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#define SYS_FREQUENCY (PLL_FREQ * 1000000)
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static inline void spin(volatile uint32_t count) {
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while (count--) (void) 0;
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}
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enum { GPIO_MODE_INPUT, GPIO_MODE_OUTPUT, GPIO_MODE_AF, GPIO_MODE_ANALOG };
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enum { GPIO_OTYPE_PUSH_PULL, GPIO_OTYPE_OPEN_DRAIN };
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enum { GPIO_SPEED_LOW, GPIO_SPEED_HIGH };
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enum { GPIO_PULL_NONE, GPIO_PULL_UP, GPIO_PULL_DOWN };
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#define GPIO(bank) ((GPIOA_AHB_Type *) (GPIOA_AHB_BASE + 0x1000U * (bank)))
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// CMSIS header forces 0xFF mask when writing to DATA (see 10.6 in datasheet)
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// and does not seem to support that feature for writing by defining RESERVED0
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// to read-only
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static inline void gpio_toggle(uint16_t pin) {
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GPIOA_AHB_Type *gpio = GPIO(PINBANK(pin));
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volatile uint32_t *GPIODATA = (volatile uint32_t *) gpio->RESERVED0;
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uint8_t mask = BIT(PINNO(pin));
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GPIODATA[mask] ^= mask;
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}
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static inline int gpio_read(uint16_t pin) {
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GPIOA_AHB_Type *gpio = GPIO(PINBANK(pin));
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volatile uint32_t *GPIODATA = (volatile uint32_t *) gpio->RESERVED0;
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uint8_t mask = BIT(PINNO(pin));
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return GPIODATA[mask] ? 1 : 0;
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}
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static inline void gpio_write(uint16_t pin, bool val) {
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GPIOA_AHB_Type *gpio = GPIO(PINBANK(pin));
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volatile uint32_t *GPIODATA = (volatile uint32_t *) gpio->RESERVED0;
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uint8_t mask = BIT(PINNO(pin));
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GPIODATA[mask] = val ? mask : 0;
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}
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static inline void gpio_init(uint16_t pin, uint8_t mode, uint8_t type,
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uint8_t speed, uint8_t pull, uint8_t af) {
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GPIOA_AHB_Type *gpio = GPIO(PINBANK(pin));
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uint8_t n = (uint8_t) (PINNO(pin));
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SYSCTL->RCGCGPIO |= BIT(PINBANK(pin)); // Enable GPIO clock
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if (mode == GPIO_MODE_ANALOG) {
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gpio->AMSEL |= BIT(PINNO(pin));
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return;
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}
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if (mode == GPIO_MODE_INPUT) {
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gpio->DIR &= ~BIT(PINNO(pin));
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} else if (mode == GPIO_MODE_OUTPUT) {
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gpio->DIR |= BIT(PINNO(pin));
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} else { // GPIO_MODE_AF
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SETBITS(gpio->PCTL, 15UL << ((n & 7) * 4),
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((uint32_t) af) << ((n & 7) * 4));
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gpio->AFSEL |= BIT(PINNO(pin));
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}
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gpio->DEN |= BIT(PINNO(pin)); // Enable pin as digital function
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if (type == GPIO_OTYPE_OPEN_DRAIN)
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gpio->ODR |= BIT(PINNO(pin));
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else // GPIO_OTYPE_PUSH_PULL
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gpio->ODR &= ~BIT(PINNO(pin));
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if (speed == GPIO_SPEED_LOW)
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gpio->SLR |= BIT(PINNO(pin));
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else // GPIO_SPEED_HIGH
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gpio->SLR &= ~BIT(PINNO(pin));
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if (pull == GPIO_PULL_UP) {
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gpio->PUR |= BIT(PINNO(pin)); // setting one...
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} else if (pull == GPIO_PULL_DOWN) {
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gpio->PDR |= BIT(PINNO(pin)); // ...just clears the other
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} else {
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gpio->PUR &= ~BIT(PINNO(pin));
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gpio->PDR &= ~BIT(PINNO(pin));
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}
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}
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static inline void gpio_input(uint16_t pin) {
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gpio_init(pin, GPIO_MODE_INPUT, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_HIGH,
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GPIO_PULL_NONE, 0);
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}
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static inline void gpio_output(uint16_t pin) {
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gpio_init(pin, GPIO_MODE_OUTPUT, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_HIGH,
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GPIO_PULL_NONE, 0);
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}
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static inline void gpio_irq_attach(uint16_t pin) {
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uint8_t irqvecs[] = {16, 17, 18, 19, 20, 30, 31, 32,
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51, 52, 53, 72, 73, 76, 84};
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GPIOA_AHB_Type *gpio = GPIO(PINBANK(pin));
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gpio->IS &= ~BIT(PINNO(pin)); // edge sensitive
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gpio->IBE |= BIT(PINNO(pin)); // both edges
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gpio->IM |= BIT(PINNO(pin)); // enable pin irq
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int irqvec = irqvecs[PINBANK(pin)]; // IRQ vector index, 2.5.2
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NVIC_SetPriority(irqvec, 3);
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NVIC_EnableIRQ(irqvec);
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}
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#ifndef UART_DEBUG
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#define UART_DEBUG UART0
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#endif
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#define UART_OFFSET 0x1000
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#define UART(N) ((UART0_Type *) (UART0_BASE + UART_OFFSET * (N)))
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#define UARTNO(u) ((uint8_t) (((unsigned int) (u) -UART0_BASE) / UART_OFFSET))
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static inline void uart_init(UART0_Type *uart, unsigned long baud) {
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struct uarthw {
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uint16_t rx, tx; // pins
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uint8_t af; // Alternate function
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};
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// rx, tx, af for UART0,1,2
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struct uarthw uarthw[3] = {{PIN('A', 0), PIN('A', 1), 1},
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{PIN('B', 0), PIN('B', 1), 1},
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{PIN('A', 6), PIN('A', 7), 1}}; // or PD4, PD5...
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uint8_t uartno = UARTNO(uart);
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SYSCTL->RCGCUART |= BIT(uartno); // Enable peripheral clock
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gpio_init(uarthw[uartno].tx, GPIO_MODE_AF, GPIO_OTYPE_PUSH_PULL,
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GPIO_SPEED_HIGH, 0, uarthw[uartno].af);
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gpio_init(uarthw[uartno].rx, GPIO_MODE_AF, GPIO_OTYPE_PUSH_PULL,
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GPIO_SPEED_HIGH, 0, uarthw[uartno].af);
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// (16.3.2) ClkDiv = 16 (HSE=0)
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// BRD = BRDI + BRDF = UARTSysClk / (ClkDiv * Baud Rate)
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// UARTFBRD[DIVFRAC] = integer(BRDF * 64 + 0.5)
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// must write in this order
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uart->CTL = 0; // Disable this UART, clear HSE
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uart->IBRD = SYS_FREQUENCY / (16 * baud); // Baud rate, integer part
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uart->FBRD = ((SYS_FREQUENCY % (16 * baud)) >> 26) &
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0x3F; // Baud rate, fractional part
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uart->LCRH = (3 << 5); // 8N1, no FIFOs;
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uart->CTL |= BIT(0) | BIT(9) | BIT(8); // Set UARTEN, RXE, TXE
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}
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static inline void uart_write_byte(UART0_Type *uart, uint8_t byte) {
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uart->DR = byte;
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while ((uart->FR & BIT(7)) == 0) spin(1);
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}
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static inline void uart_write_buf(UART0_Type *uart, char *buf, size_t len) {
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while (len-- > 0) uart_write_byte(uart, *(uint8_t *) buf++);
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}
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static inline int uart_read_ready(UART0_Type *uart) {
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return uart->FR & BIT(6); // If RXFF bit is set, data is ready
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}
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static inline uint8_t uart_read_byte(UART0_Type *uart) {
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return (uint8_t) (uart->DR & 0xFF);
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}
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@ -1,13 +1,13 @@
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ENTRY(_reset);
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ENTRY(Reset_Handler);
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MEMORY {
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flash(rx) : ORIGIN = 0x00000000, LENGTH = 1024k
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flash(rx) : ORIGIN = 0x00000000, LENGTH = 1024k
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sram(rwx) : ORIGIN = 0x20000000, LENGTH = 256k
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}
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_estack = ORIGIN(sram) + LENGTH(sram); /* stack points to end of SRAM */
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SECTIONS {
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.vectors : { KEEP(*(.vectors)) } > flash
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.text : { *(.text*) } > flash
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.text : { *(.text* .text.*) } > flash
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.rodata : { *(.rodata*) } > flash
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.data : {
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@ -17,6 +17,7 @@ SECTIONS {
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_edata = .; /* for init_ram() */
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} > sram AT > flash
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_sidata = LOADADDR(.data);
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. = ALIGN (CONSTANT (COMMONPAGESIZE));
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.bss : {
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_sbss = .; /* for init_ram() */
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@ -1,75 +1,51 @@
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// Copyright (c) 2022 Cesanta Software Limited
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// Copyright (c) 2022-2023 Cesanta Software Limited
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// All rights reserved
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#include "mcu.h"
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#include "hal.h"
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#include "mongoose.h"
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#define LED1 PIN('N', 1) // On-board LED pin
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#define LED2 PIN('N', 0) // On-board LED pin
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#define LED3 PIN('F', 4) // On-board LED pin
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#define LED4 PIN('F', 0) // On-board LED pin
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#define BTN1 PIN('J', 0) // On-board user button
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#define BTN2 PIN('J', 1) // On-board user button
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static uint64_t s_ticks, s_exti; // Counters, increased by IRQ handlers
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#define LED LED1 // Use this LED for blinking
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#define BLINK_PERIOD_MS 1000 // LED blinking period in millis
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static void blink_cb(void *arg) { // Blink periodically
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struct mg_tcpip_if *ifp = arg;
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gpio_toggle(LED1);
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MG_INFO(("Ethernet: %s", ifp->driver->up(ifp) ? "up": "down"));
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}
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uint64_t mg_millis(void) { // Declare our own uptime function
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return s_ticks; // Return number of milliseconds since boot
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}
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void HardFault_Handler(void) { // Escalated fault handler
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gpio_write(LED1, 1);
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gpio_write(LED2, 0);
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for (;;)
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spin(2999999), gpio_toggle(LED1),
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gpio_toggle(LED2); // Alternate LEDs forever
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}
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void SysTick_Handler(void) { // SyStick IRQ handler, triggered every 1ms
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static volatile uint64_t s_ticks; // Milliseconds since boot
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void SysTick_Handler(void) { // SyStick IRQ handler, triggered every 1ms
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s_ticks++;
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}
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void GPIOJ_Handler(void) { // External interrupt handler
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s_exti++;
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struct gpio *gpio = gpio_bank(BTN1);
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if (gpio->GPIOMIS & BIT(PINNO(BTN1))) gpio->GPIOICR = BIT(PINNO(BTN1));
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gpio_write(LED2,
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!gpio_read(BTN1)); // No debounce. Turn LED if button is pressed
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uint64_t mg_millis(void) { // Let Mongoose use our uptime function
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return s_ticks; // Return number of milliseconds since boot
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}
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int main(void) {
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static struct uart *uart = UART0; // Use UART0 (attached to ICDI)
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clock_init(); // Set clock to 120MHz
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systick_init(FREQ / 1000); // Increment s_ticks every ms
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gpio_output(LED1); // Setup user LEDs
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gpio_output(LED2);
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gpio_input(BTN1); // Set button to input
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gpio_irq_attach(BTN1); // generate interrupts
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uart_init(uart, 115200);
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static void timer_fn(void *arg) {
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gpio_toggle(LED); // Blink LED
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struct mg_tcpip_if *ifp = arg; // And show
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const char *names[] = {"down", "up", "ready"}; // network stats
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MG_INFO(("Ethernet: %s, IP: %M, rx:%u, tx:%u, dr:%u, er:%u",
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names[ifp->state], mg_print_ip4, &ifp->ip, ifp->nrecv, ifp->nsent,
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ifp->ndrop, ifp->nerr));
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}
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nvic_enable_irq(40); // Setup Ethernet IRQ handler
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MG_INFO(("Init hw"));
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// See datasheet: https://www.ti.com/lit/pdf/spms433
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static void ethernet_init(void) {
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// Initialise Ethernet. Enable MAC GPIO pins, see
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// https://www.ti.com/lit/pdf/spms433
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// Assign LED3 and LED4 to the EPHY, "activity" and "link", respectively.
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// (20.4.2.4)
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gpio_init(LED3, GPIO_MODE_AF, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_HIGH,
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GPIO_PULL_NONE, 5); // EN0LED1
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gpio_init(LED4, GPIO_MODE_AF, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_HIGH,
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GPIO_PULL_NONE, 5); // EN0LED0
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NVIC_EnableIRQ(EMAC0_IRQn); // Setup Ethernet IRQ handler
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// Initialize Ethernet clocks, see datasheet section 5
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// Turn Flash Prefetch off (silicon errata ETH#02)
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volatile uint32_t *IMC = (uint32_t *) 0x400FD000;
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uint32_t val = IMC[0xFC8 / sizeof(*IMC)];
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uint32_t val = FLASH_CTRL->CONF;
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val &= ~BIT(17);
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val |= BIT(16);
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IMC[0xFC8 / sizeof(*IMC)] = val;
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FLASH_CTRL->CONF = val;
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SYSCTL->RCGCEMAC |= BIT(0); // Enable EMAC clock
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SYSCTL->SREMAC |= BIT(0); // Reset EMAC
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SYSCTL->SREMAC &= ~BIT(0);
|
||||
@ -78,31 +54,48 @@ int main(void) {
|
||||
SYSCTL->SREPHY &= ~BIT(0);
|
||||
while (!(SYSCTL->PREMAC & BIT(0)) || !(SYSCTL->PREPHY & BIT(0)))
|
||||
spin(1); // Wait for reset to complete
|
||||
}
|
||||
|
||||
struct mg_mgr mgr; // Initialize Mongoose event manager
|
||||
mg_mgr_init(&mgr); // and attach it to the MIP interface
|
||||
int main(void) {
|
||||
gpio_output(LED); // Setup leftmost LED
|
||||
uart_init(UART_DEBUG, 115200); // Initialise debug printf
|
||||
ethernet_init(); // Initialise ethernet pins
|
||||
MG_INFO(("Starting, CPU freq %g MHz", (double) SystemCoreClock / 1000000));
|
||||
|
||||
struct mg_mgr mgr; // Initialise
|
||||
mg_mgr_init(&mgr); // Mongoose event manager
|
||||
mg_log_set(MG_LL_DEBUG); // Set log level
|
||||
|
||||
// Initialize Mongoose network stack
|
||||
// Initialise Mongoose network stack
|
||||
// Specify MAC address, and IP/mask/GW in network byte order for static
|
||||
// IP configuration. If IP/mask/GW are unset, DHCP is going to be used
|
||||
struct mg_tcpip_driver_tm4c_data driver_data = {.mdc_cr = 1}; // See driver_tm4c.h
|
||||
struct mg_tcpip_driver_tm4c_data driver_data = {.mdc_cr =
|
||||
1}; // See driver_tm4c.h
|
||||
struct mg_tcpip_if mif = {
|
||||
.mac = {2, 0, 1, 2, 3, 5},
|
||||
.driver = &mg_tcpip_driver_tm4c,
|
||||
.driver_data = &driver_data,
|
||||
};
|
||||
mg_tcpip_init(&mgr, &mif);
|
||||
val = IMC[0xFC8 / sizeof(*IMC)]; // Turn Flash Prefetch on again
|
||||
uint32_t val = FLASH_CTRL->CONF; // Turn Flash Prefetch on again
|
||||
val &= ~BIT(16);
|
||||
val |= BIT(17);
|
||||
IMC[0xFC8 / sizeof(*IMC)] = val;
|
||||
MG_INFO(("Init done, starting main loop"));
|
||||
mg_timer_add(&mgr, 1000, MG_TIMER_REPEAT, blink_cb, &mif);
|
||||
FLASH_CTRL->CONF = val;
|
||||
mg_timer_add(&mgr, BLINK_PERIOD_MS, MG_TIMER_REPEAT, timer_fn, &mif);
|
||||
|
||||
MG_INFO(("MAC: %M. Waiting for IP...", mg_print_mac, mif.mac));
|
||||
while (mif.state != MIP_STATE_READY) {
|
||||
mg_mgr_poll(&mgr, 0);
|
||||
}
|
||||
|
||||
MG_INFO(("Initialising application..."));
|
||||
extern void device_dashboard_fn(struct mg_connection *, int, void *, void *);
|
||||
mg_http_listen(&mgr, "http://0.0.0.0", device_dashboard_fn, NULL);
|
||||
for (;;) mg_mgr_poll(&mgr, 0); // Infinite event loop
|
||||
|
||||
MG_INFO(("Starting event loop"));
|
||||
for (;;) {
|
||||
mg_mgr_poll(&mgr, 0);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -1,257 +0,0 @@
|
||||
// Copyright (c) 2022 Cesanta Software Limited
|
||||
// All rights reserved
|
||||
// https://www.ti.com/lit/pdf/spms433
|
||||
|
||||
#pragma once
|
||||
|
||||
#include <stdbool.h>
|
||||
#include <stdint.h>
|
||||
#include <stdio.h>
|
||||
#include <string.h>
|
||||
|
||||
#define BIT(x) (1UL << (x))
|
||||
#define SETBITS(R, CLEARMASK, SETMASK) (R) = ((R) & ~(CLEARMASK)) | (SETMASK)
|
||||
#define PIN(bank, num) ((bank << 8) | (num))
|
||||
#define PINNO(pin) (pin & 255)
|
||||
#define PINBANK(pin) pinbank(pin >> 8)
|
||||
// This MCU doesn't have GPIOI nor GPIOO
|
||||
static inline unsigned int pinbank(unsigned int bank) {
|
||||
bank = bank > 'O' ? bank - 2 : bank > 'I' ? bank - 1 : bank;
|
||||
return bank - 'A';
|
||||
}
|
||||
|
||||
// 5.5, Table 5-12: configure flash (and EEPROM) timing in accordance to clock
|
||||
// freq
|
||||
enum {
|
||||
PLL_CLK = 25,
|
||||
PLL_M = 96,
|
||||
PLL_N = 5,
|
||||
PLL_Q = 1,
|
||||
PSYSDIV = 4
|
||||
}; // Run at 120 Mhz
|
||||
#define PLL_FREQ (PLL_CLK * PLL_M / PLL_N / PLL_Q / PSYSDIV)
|
||||
#define FLASH_CLKHIGH 6
|
||||
#define FLASH_WAITST 5
|
||||
#define FREQ (PLL_FREQ * 1000000)
|
||||
|
||||
static inline void spin(volatile uint32_t count) {
|
||||
while (count--) asm("nop");
|
||||
}
|
||||
|
||||
struct systick {
|
||||
volatile uint32_t CTRL, LOAD, VAL, CALIB;
|
||||
};
|
||||
#define SYSTICK ((struct systick *) 0xe000e010)
|
||||
static inline void systick_init(uint32_t ticks) {
|
||||
if ((ticks - 1) > 0xffffff) return; // Systick timer is 24 bit
|
||||
SYSTICK->LOAD = ticks - 1;
|
||||
SYSTICK->VAL = 0;
|
||||
SYSTICK->CTRL = BIT(0) | BIT(1) | BIT(2); // Enable systick
|
||||
}
|
||||
|
||||
struct nvic {
|
||||
volatile uint32_t ISER[8], RESERVED0[24], ICER[8], RSERVED1[24], ISPR[8],
|
||||
RESERVED2[24], ICPR[8], RESERVED3[24], IABR[8], RESERVED4[56], IP[240],
|
||||
RESERVED5[644], STIR;
|
||||
};
|
||||
#define NVIC ((struct nvic *) 0xe000e100)
|
||||
static inline void nvic_set_prio(int irq, uint32_t prio) {
|
||||
NVIC->IP[irq] = prio << 4;
|
||||
}
|
||||
static inline void nvic_enable_irq(int irq) {
|
||||
NVIC->ISER[irq >> 5] = (uint32_t) (1 << (irq & 31));
|
||||
}
|
||||
|
||||
struct scb {
|
||||
volatile uint32_t CPUID, ICSR, VTOR, AIRCR, SCR, CCR, SHPR[3], SHCSR, CFSR,
|
||||
HFSR, DFSR, MMFAR, BFAR, AFSR, ID_PFR[2], ID_DFR, ID_AFR, ID_MFR[4],
|
||||
ID_ISAR[5], RESERVED0[1], CLIDR, CTR, CCSIDR, CSSELR, CPACR,
|
||||
RESERVED3[93], STIR, RESERVED4[15], MVFR0, MVFR1, MVFR2, RESERVED5[1],
|
||||
ICIALLU, RESERVED6[1], ICIMVAU, DCIMVAC, DCISW, DCCMVAU, DCCMVAC, DCCSW,
|
||||
DCCIMVAC, DCCISW, RESERVED7[6], ITCMCR, DTCMCR, AHBPCR, CACR, AHBSCR,
|
||||
RESERVED8[1], ABFSR;
|
||||
};
|
||||
#define SCB ((struct scb *) 0xe000ed00)
|
||||
|
||||
struct sysctl {
|
||||
volatile uint32_t DONTCARE0[31], MOSCCTL, RESERVED0[12], RSCLKCFG,
|
||||
RESERVED1[3], MEMTIM0, DONTCARE1[39], PLLFREQ0, PLLFREQ1, PLLSTAT,
|
||||
DONTCARE2[241], SREPHY, DONTCARE3[26], SREMAC, DONTCARE4[26], RCGCGPIO,
|
||||
DONTCARE5[3], RCGCUART, DONTCARE6[5], RCGCEPHY, DONTCARE7[26], RCGCEMAC,
|
||||
DONTCARE8[228], PREPHY, DONTCARE9[26], PREMAC;
|
||||
};
|
||||
#define SYSCTL ((struct sysctl *) 0x400FE000)
|
||||
|
||||
enum { GPIO_MODE_INPUT, GPIO_MODE_OUTPUT, GPIO_MODE_AF, GPIO_MODE_ANALOG };
|
||||
enum { GPIO_OTYPE_PUSH_PULL, GPIO_OTYPE_OPEN_DRAIN };
|
||||
enum { GPIO_SPEED_LOW, GPIO_SPEED_HIGH };
|
||||
enum { GPIO_PULL_NONE, GPIO_PULL_UP, GPIO_PULL_DOWN };
|
||||
|
||||
// 10.3, 10.6
|
||||
struct gpio {
|
||||
volatile uint32_t GPIODATA[256], GPIODIR, GPIOIS, GPIOIBE, GPIOIEV, GPIOIM,
|
||||
GPIORIS, GPIOMIS, GPIOICR, GPIOAFSEL, RESERVED1[55], GPIODR2R, GPIODR4R,
|
||||
GPIODR8R, GPIOODR, GPIOPUR, GPIOPDR, GPIOSLR, GPIODEN, GPIOLOCK, GPIOCR,
|
||||
GPIOAMSEL, GPIOPCTL, GPIOADCCTL, GPIODMACTL, GPIOSI, GPIODR12R,
|
||||
GPIOWAKEPEN, GPIOWAKELVL, GPIOWAKESTAT, RESERVED2[669], GPIOPP, GPIOPC,
|
||||
RESERVED3[2], GPIOPeriphID4, GPIOPeriphID5, GPIOPeriphID6, GPIOPeriphID7,
|
||||
GPIOPeriphID0, GPIOPeriphID1, GPIOPeriphID2, GPIOPeriphID3, GPIOPCellID0,
|
||||
GPIOPCellID1, GPIOPCellID2, GPIOPCellID3;
|
||||
};
|
||||
#define GPIO(N) ((struct gpio *) (0x40058000 + 0x1000 * (N)))
|
||||
|
||||
static struct gpio *gpio_bank(uint16_t pin) {
|
||||
return GPIO(PINBANK(pin));
|
||||
}
|
||||
static inline void gpio_toggle(uint16_t pin) {
|
||||
struct gpio *gpio = gpio_bank(pin);
|
||||
uint8_t mask = BIT(PINNO(pin));
|
||||
gpio->GPIODATA[mask] ^= mask;
|
||||
}
|
||||
static inline int gpio_read(uint16_t pin) {
|
||||
return gpio_bank(pin)->GPIODATA[BIT(PINNO(pin))] ? 1 : 0;
|
||||
}
|
||||
static inline void gpio_write(uint16_t pin, bool val) {
|
||||
struct gpio *gpio = gpio_bank(pin);
|
||||
uint8_t mask = BIT(PINNO(pin));
|
||||
gpio->GPIODATA[mask] = val ? mask : 0;
|
||||
}
|
||||
static inline void gpio_init(uint16_t pin, uint8_t mode, uint8_t type,
|
||||
uint8_t speed, uint8_t pull, uint8_t af) {
|
||||
struct gpio *gpio = gpio_bank(pin);
|
||||
uint8_t n = (uint8_t) (PINNO(pin));
|
||||
SYSCTL->RCGCGPIO |= BIT(PINBANK(pin)); // Enable GPIO clock
|
||||
if (mode == GPIO_MODE_ANALOG) {
|
||||
gpio->GPIOAMSEL |= BIT(PINNO(pin));
|
||||
return;
|
||||
}
|
||||
if (mode == GPIO_MODE_INPUT) {
|
||||
gpio->GPIODIR &= ~BIT(PINNO(pin));
|
||||
} else if (mode == GPIO_MODE_OUTPUT) {
|
||||
gpio->GPIODIR |= BIT(PINNO(pin));
|
||||
} else { // GPIO_MODE_AF
|
||||
SETBITS(gpio->GPIOPCTL, 15UL << ((n & 7) * 4),
|
||||
((uint32_t) af) << ((n & 7) * 4));
|
||||
gpio->GPIOAFSEL |= BIT(PINNO(pin));
|
||||
}
|
||||
gpio->GPIODEN |= BIT(PINNO(pin)); // Enable pin as digital function
|
||||
if (type == GPIO_OTYPE_OPEN_DRAIN)
|
||||
gpio->GPIOODR |= BIT(PINNO(pin));
|
||||
else // GPIO_OTYPE_PUSH_PULL
|
||||
gpio->GPIOODR &= ~BIT(PINNO(pin));
|
||||
if (speed == GPIO_SPEED_LOW)
|
||||
gpio->GPIOSLR |= BIT(PINNO(pin));
|
||||
else // GPIO_SPEED_HIGH
|
||||
gpio->GPIOSLR &= ~BIT(PINNO(pin));
|
||||
if (pull == GPIO_PULL_UP) {
|
||||
gpio->GPIOPUR |= BIT(PINNO(pin)); // setting one...
|
||||
} else if (pull == GPIO_PULL_DOWN) {
|
||||
gpio->GPIOPDR |= BIT(PINNO(pin)); // ...just clears the other
|
||||
} else {
|
||||
gpio->GPIOPUR &= ~BIT(PINNO(pin));
|
||||
gpio->GPIOPDR &= ~BIT(PINNO(pin));
|
||||
}
|
||||
}
|
||||
static inline void gpio_input(uint16_t pin) {
|
||||
gpio_init(pin, GPIO_MODE_INPUT, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_HIGH,
|
||||
GPIO_PULL_UP, 0); // EK does not have pull-up resistors
|
||||
}
|
||||
static inline void gpio_output(uint16_t pin) {
|
||||
gpio_init(pin, GPIO_MODE_OUTPUT, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_HIGH,
|
||||
GPIO_PULL_NONE, 0);
|
||||
}
|
||||
|
||||
static inline void gpio_irq_attach(uint16_t pin) {
|
||||
uint8_t irqvecs[] = {16, 17, 18, 19, 20, 30, 31, 32,
|
||||
51, 52, 53, 72, 73, 76, 84};
|
||||
struct gpio *gpio = gpio_bank(pin);
|
||||
gpio->GPIOIS &= ~BIT(PINNO(pin)); // edge sensitive
|
||||
gpio->GPIOIBE |= BIT(PINNO(pin)); // both edges
|
||||
gpio->GPIOIM |= BIT(PINNO(pin)); // enable pin irq
|
||||
int irqvec = irqvecs[PINBANK(pin)]; // IRQ vector index, 2.5.2
|
||||
nvic_set_prio(irqvec, 3);
|
||||
nvic_enable_irq(irqvec);
|
||||
}
|
||||
|
||||
struct uart {
|
||||
volatile uint32_t UARTDR, UARTRSR, RESERVED0[4], UARTFR, RESERVED1, UARTILPR,
|
||||
UARTIBRD, UARTFBRD, UARTLCRH, UARTCTL, UARTIFLS, UARTIM, UARTRIS, UARTMIS,
|
||||
UARTICR, UARTDMACTL, RESERVED2[22], UART9BITADDR, UART9BITAMASK,
|
||||
RESERVED3[965], UARTPP, RESERVED4, UARTCC, RESERVED5, UARTPeriphID4,
|
||||
UARTPeriphID5, UARTPeriphID6, UARTPeriphID7, UARTPeriphID0, UARTPeriphID1,
|
||||
UARTPeriphID2, UARTPeriphID3, UARTPCellID0, UARTPCellID1, UARTPCellID2,
|
||||
UARTPCellID3;
|
||||
};
|
||||
#define UARTECR UARTRSR
|
||||
#define USART_BASE 0x4000C000
|
||||
#define USART_OFFSET 0x1000
|
||||
#define USART(N) ((struct uart *) (USART_BASE + USART_OFFSET * (N)))
|
||||
#define UARTNO(u) ((uint8_t)(((unsigned int) (u) - USART_BASE) / USART_OFFSET))
|
||||
|
||||
#define UART0 USART(0)
|
||||
|
||||
static inline void uart_init(struct uart *uart, unsigned long baud) {
|
||||
struct uarthw {
|
||||
uint16_t rx, tx; // pins
|
||||
uint8_t af; // Alternate function
|
||||
};
|
||||
// af, rx, tx for UART0
|
||||
struct uarthw uarthw[1] = {{PIN('A', 0), PIN('A', 1), 1}};
|
||||
|
||||
if (uart != UART0) return; // uarthw is not populated for other UARTs
|
||||
|
||||
uint8_t uartno = UARTNO(uart);
|
||||
SYSCTL->RCGCUART |= BIT(uartno); // Enable peripheral clock
|
||||
|
||||
gpio_init(uarthw[uartno].tx, GPIO_MODE_AF, GPIO_OTYPE_PUSH_PULL,
|
||||
GPIO_SPEED_HIGH, 0, uarthw[uartno].af);
|
||||
gpio_init(uarthw[uartno].rx, GPIO_MODE_AF, GPIO_OTYPE_PUSH_PULL,
|
||||
GPIO_SPEED_HIGH, 0, uarthw[uartno].af);
|
||||
// (16.3.2) ClkDiv = 16 (HSE=0)
|
||||
// BRD = BRDI + BRDF = UARTSysClk / (ClkDiv * Baud Rate)
|
||||
// UARTFBRD[DIVFRAC] = integer(BRDF * 64 + 0.5)
|
||||
// must write in this order
|
||||
uart->UARTCTL = 0; // Disable this UART, clear HSE
|
||||
uart->UARTIBRD = FREQ / (16 * baud); // Baud rate, integer part
|
||||
uart->UARTFBRD =
|
||||
((FREQ % (16 * baud)) >> 26) & 0x3F; // Baud rate, fractional part
|
||||
uart->UARTLCRH = (3 << 5); // 8N1, no FIFOs;
|
||||
uart->UARTCTL |= BIT(0) | BIT(9) | BIT(8); // Set UARTEN, RXE, TXE
|
||||
}
|
||||
static inline void uart_write_byte(struct uart *uart, uint8_t byte) {
|
||||
uart->UARTDR = byte;
|
||||
while ((uart->UARTFR & BIT(7)) == 0) spin(1);
|
||||
}
|
||||
static inline void uart_write_buf(struct uart *uart, char *buf, size_t len) {
|
||||
while (len-- > 0) uart_write_byte(uart, *(uint8_t *) buf++);
|
||||
}
|
||||
static inline int uart_read_ready(struct uart *uart) {
|
||||
return uart->UARTFR & BIT(6); // If RXFF bit is set, data is ready
|
||||
}
|
||||
static inline uint8_t uart_read_byte(struct uart *uart) {
|
||||
return (uint8_t) (uart->UARTDR & 0xFF);
|
||||
}
|
||||
|
||||
static inline void clock_init(void) { // Set clock frequency
|
||||
SCB->CPACR |= ((3UL << 10 * 2) | (3UL << 11 * 2)); // Enable FPU
|
||||
asm("DSB");
|
||||
asm("ISB");
|
||||
SETBITS(SYSCTL->MOSCCTL, BIT(3) | BIT(2),
|
||||
BIT(4)); // Enable MOSC circuit (clear NOXTAL and PWRDN, set >10MHz
|
||||
// range)
|
||||
SETBITS(SYSCTL->MEMTIM0,
|
||||
BIT(21) | BIT(5) | 0x1F << 21 | 0xF << 16 | 0x1F << 5 | 0xF << 0,
|
||||
FLASH_CLKHIGH << 22 | FLASH_WAITST << 16 | FLASH_CLKHIGH << 5 |
|
||||
FLASH_WAITST << 0); // Configure flash timing (not yet applied)
|
||||
SETBITS(SYSCTL->RSCLKCFG, 0xF << 24 | (BIT(9) - 1),
|
||||
3 << 24); // Clear PLL divider, set MOSC as PLL source
|
||||
SYSCTL->PLLFREQ1 = (PLL_Q - 1) << 8 | (PLL_N - 1)
|
||||
<< 0; // Set PLL_Q and PLL_N
|
||||
SYSCTL->PLLFREQ0 =
|
||||
BIT(23) | PLL_M << 0; // Set PLL_Q, power up PLL (if it were on, we'd
|
||||
// need to set NEWFREQ in RSCLKCFG instead)
|
||||
while ((SYSCTL->PLLSTAT & BIT(0)) == 0) spin(1); // Wait for lock
|
||||
SYSCTL->RSCLKCFG |=
|
||||
BIT(31) | BIT(28) |
|
||||
(PSYSDIV - 1) << 0; // Update memory timing, use PLL, set clock divisor
|
||||
}
|
||||
1
examples/ti/ek-tm4c1294xl-baremetal/mongoose.c
Symbolic link
1
examples/ti/ek-tm4c1294xl-baremetal/mongoose.c
Symbolic link
@ -0,0 +1 @@
|
||||
../../../mongoose.c
|
||||
1
examples/ti/ek-tm4c1294xl-baremetal/mongoose.h
Symbolic link
1
examples/ti/ek-tm4c1294xl-baremetal/mongoose.h
Symbolic link
@ -0,0 +1 @@
|
||||
../../../mongoose.h
|
||||
1
examples/ti/ek-tm4c1294xl-baremetal/net.c
Symbolic link
1
examples/ti/ek-tm4c1294xl-baremetal/net.c
Symbolic link
@ -0,0 +1 @@
|
||||
../../device-dashboard/net.c
|
||||
1
examples/ti/ek-tm4c1294xl-baremetal/packed_fs.c
Symbolic link
1
examples/ti/ek-tm4c1294xl-baremetal/packed_fs.c
Symbolic link
@ -0,0 +1 @@
|
||||
../../device-dashboard/packed_fs.c
|
||||
@ -2,22 +2,27 @@
|
||||
// All rights reserved
|
||||
|
||||
// Startup code
|
||||
__attribute__((naked, noreturn)) void _reset(void) {
|
||||
__attribute__((naked, noreturn)) void Reset_Handler(void) {
|
||||
// Initialise memory
|
||||
extern long _sbss, _ebss, _sdata, _edata, _sidata;
|
||||
for (long *src = &_sbss; src < &_ebss; src++) *src = 0;
|
||||
for (long *src = &_sdata, *dst = &_sidata; src < &_edata;) *src++ = *dst++;
|
||||
|
||||
// Call main()
|
||||
// Call the clock system initialization function
|
||||
extern void SystemInit(void);
|
||||
SystemInit();
|
||||
// Call static constructors
|
||||
extern void __libc_init_array(void);
|
||||
__libc_init_array();
|
||||
// Call the application entry point
|
||||
extern void main(void);
|
||||
main();
|
||||
for (;;) (void) 0;
|
||||
for (;;) (void) 0; // Infinite loop
|
||||
}
|
||||
|
||||
void __attribute__((weak)) DefaultIRQHandler(void) {
|
||||
for (;;) (void) 0;
|
||||
}
|
||||
|
||||
#define WEAK_ALIAS __attribute__((weak, alias("DefaultIRQHandler")))
|
||||
|
||||
WEAK_ALIAS void NMI_Handler(void);
|
||||
@ -128,11 +133,12 @@ WEAK_ALIAS void I2C7_Handler(void);
|
||||
WEAK_ALIAS void I2C8_Handler(void);
|
||||
WEAK_ALIAS void I2C9_Handler(void);
|
||||
|
||||
// IRQ table, 2.5.1 Table 2-9
|
||||
extern void _estack();
|
||||
|
||||
// IRQ table
|
||||
__attribute__((section(".vectors"))) void (*tab[16 + 114])(void) = {
|
||||
// Cortex interrupts
|
||||
_estack, _reset, NMI_Handler, HardFault_Handler, MemManage_Handler,
|
||||
_estack, Reset_Handler, NMI_Handler, HardFault_Handler, MemManage_Handler,
|
||||
BusFault_Handler, UsageFault_Handler, 0, 0, 0, 0, SVC_Handler,
|
||||
DebugMon_Handler, 0, PendSV_Handler, SysTick_Handler,
|
||||
|
||||
@ -1,6 +1,6 @@
|
||||
#include <sys/stat.h>
|
||||
|
||||
#include "mcu.h"
|
||||
#include "hal.h"
|
||||
|
||||
int _fstat(int fd, struct stat *st) {
|
||||
if (fd < 0) return -1;
|
||||
@ -56,7 +56,7 @@ int _getpid(void) {
|
||||
|
||||
int _write(int fd, char *ptr, int len) {
|
||||
(void) fd, (void) ptr, (void) len;
|
||||
if (fd == 1) uart_write_buf(UART0, ptr, (size_t) len);
|
||||
if (fd == 1) uart_write_buf(UART_DEBUG, ptr, (size_t) len);
|
||||
return -1;
|
||||
}
|
||||
|
||||
@ -84,3 +84,5 @@ int mkdir(const char *path, mode_t mode) {
|
||||
(void) path, (void) mode;
|
||||
return -1;
|
||||
}
|
||||
|
||||
void _init(void) {}
|
||||
|
||||
36
examples/ti/ek-tm4c1294xl-baremetal/sysinit.c
Normal file
36
examples/ti/ek-tm4c1294xl-baremetal/sysinit.c
Normal file
@ -0,0 +1,36 @@
|
||||
// Copyright (c) 2023 Cesanta Software Limited
|
||||
// All rights reserved
|
||||
//
|
||||
// This file contains essentials required by the CMSIS:
|
||||
// uint32_t SystemCoreClock - holds the system core clock value
|
||||
// SystemInit() - initialises the system, e.g. sets up clocks
|
||||
|
||||
#include "hal.h"
|
||||
|
||||
uint32_t SystemCoreClock = SYS_FREQUENCY;
|
||||
|
||||
void SystemInit(void) { // Called automatically by startup code
|
||||
SCB->CPACR |= ((3UL << 10 * 2) | (3UL << 11 * 2)); // Enable FPU
|
||||
asm("DSB");
|
||||
asm("ISB");
|
||||
SETBITS(SYSCTL->MOSCCTL, BIT(3) | BIT(2),
|
||||
BIT(4)); // Enable MOSC circuit (clear NOXTAL and PWRDN, set >10MHz
|
||||
// range)
|
||||
SETBITS(SYSCTL->MEMTIM0,
|
||||
BIT(21) | BIT(5) | 0x1F << 21 | 0xF << 16 | 0x1F << 5 | 0xF << 0,
|
||||
FLASH_CLKHIGH << 22 | FLASH_WAITST << 16 | FLASH_CLKHIGH << 5 |
|
||||
FLASH_WAITST << 0); // Configure flash timing (not yet applied)
|
||||
SETBITS(SYSCTL->RSCLKCFG, 0xF << 24 | (BIT(9) - 1),
|
||||
3 << 24); // Clear PLL divider, set MOSC as PLL source
|
||||
SYSCTL->PLLFREQ1 = (PLL_Q - 1) << 8 | (PLL_N - 1)
|
||||
<< 0; // Set PLL_Q and PLL_N
|
||||
SYSCTL->PLLFREQ0 =
|
||||
BIT(23) | PLL_M << 0; // Set PLL_Q, power up PLL (if it were on, we'd
|
||||
// need to set NEWFREQ in RSCLKCFG instead)
|
||||
while ((SYSCTL->PLLSTAT & BIT(0)) == 0) spin(1); // Wait for lock
|
||||
SYSCTL->RSCLKCFG |=
|
||||
BIT(31) | BIT(28) |
|
||||
(PSYSDIV - 1) << 0; // Update memory timing, use PLL, set clock divisor
|
||||
|
||||
SysTick_Config(SystemCoreClock / 1000); // Sys tick every 1ms
|
||||
}
|
||||
@ -1,40 +0,0 @@
|
||||
# MIP webserver over FreeRTOS on EK-TM4C1294XL
|
||||
|
||||
This firmware uses MIP, an experimental TCP/IP stack of the Mongoose Network Library, running as a FreeRTOS task.
|
||||
It implements the following:
|
||||
|
||||
- Minimal elementary web server, as simple as possible
|
||||
- No dependencies: no HAL, no CMSIS
|
||||
- Hand-written [mcu.h](mcu.h) header based on the [datasheet](https://www.ti.com/lit/pdf/spms433)
|
||||
- Interrupt-driven Ethernet driver
|
||||
- LED blinky, based on another FreeRTOS task
|
||||
- Debug log on UART0 (ICDI)
|
||||
|
||||
## Requirements
|
||||
|
||||
- [GNU make](http://mongoose.ws/tutorials/tools/#gnu-make)
|
||||
- [ARM GCC](http://mongoose.ws/tutorials/tools/#arm-gcc)
|
||||
- [Uniflash](https://mongoose.ws/tutorials/ti/ek-tm4c1294xl-baremetal/#build-and-run) for flashing
|
||||
|
||||
The links above will send you to tutorials on how to install each of those tools in your workstation for Linux, Mac, and Windows.
|
||||
|
||||
You'll also need _git_ so the Makefile can clone the FreeRTOS-Kernel repository. We assume you have it since you got to get this repository somehow. If you don't, and don't want to install it, just get the proper [FreeRTOS-Kernel](https://github.com/FreeRTOS/FreeRTOS-Kernel) version (see the Makefile) from its repository, as you did with the Mongoose repository.
|
||||
|
||||
## Usage
|
||||
|
||||
Plugin your board into USB, and attach an Ethernet cable.
|
||||
To build and flash:
|
||||
|
||||
```sh
|
||||
$ make clean flash
|
||||
```
|
||||
|
||||
To see debug log, use any serial monitor program like `picocom` at 115200 bps and configure it to insert carriage returns after line feeds:
|
||||
|
||||
```sh
|
||||
$ picocom /dev/ttyACM0 -i -b 115200 --imap=lfcrlf
|
||||
```
|
||||
|
||||
There is also a [detailed tutorial on this example](https://mongoose.ws/tutorials/ti/ek-tm4c1294xl-freertos-mip/)
|
||||
|
||||
For more details and benchmark data on MIP, check the [F746ZG baremetal example](../../stm32/nucleo-f746zg-baremetal/)
|
||||
1
examples/ti/ek-tm4c1294xl-freertos/README.md
Normal file
1
examples/ti/ek-tm4c1294xl-freertos/README.md
Normal file
@ -0,0 +1 @@
|
||||
See detailed tutorial at https://mongoose.ws/tutorials/ti/ek-tm4c1294xl-freertos/
|
||||
Loading…
Reference in New Issue
Block a user