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mongoose/examples/nxp/rt1060-evk-make-freertos-builtin/hal.h
Sergio R. Caprile 5735ee3269 default to flash 1060 
workaround SysTick race condition in FreeRTOS example
2024-01-05 13:49:50 -03:00

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// Copyright (c) 2023 Cesanta Software Limited
// All rights reserved
// https://cache.nxp.com/secured/assets/documents/en/reference-manual/IMXRT1060XRM.pdf
// https://cache.nxp.com/secured/assets/documents/en/user-guide/MIMXRT1060EVKBUM.pdf
#pragma once
#include "MIMXRT1062.h"
#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) - '0') << 8) | (num))
#define PINNO(pin) (pin & 255)
#define PINBANK(pin) (pin >> 8)
// Use LED for blinking, D8: GPIO_AD_B0_08. GPIO1.8 (schematics, RM)
#define LED PIN('1', 8)
#ifndef UART_DEBUG
#define UART_DEBUG LPUART1
#endif
// No settable constants, see sysinit.c
#define SYS_FREQUENCY 600000000UL
static inline void spin(volatile uint32_t count) {
while (count--) (void) 0;
}
enum { CLOCK_OFF = 0U, CLOCK_ON_RUN = 1U, CLOCK_ON_RUN_WAIT = 3U };
static inline void clock_periph(uint32_t index, uint32_t shift, uint32_t val) {
volatile uint32_t *r = &CCM->CCGR0;
SETBITS(r[index], 3UL << shift, val << shift);
}
// which peripheral feeds the pin
static inline void gpio_mux_config(uint16_t index, uint8_t af) {
IOMUXC->SW_MUX_CTL_PAD[index] = af;
}
// which pin feeds the peripheral (2nd stage)
static inline void periph_mux_config(uint16_t index, uint8_t in) {
IOMUXC->SELECT_INPUT[index] = in;
}
enum { GPIO_MODE_INPUT, GPIO_MODE_OUTPUT };
enum { GPIO_OTYPE_PUSH_PULL, GPIO_OTYPE_OPEN_DRAIN };
enum { GPIO_SPEED_LOW, GPIO_SPEED_MEDIUM, GPIO_SPEED_MEDIUM_, GPIO_SPEED_HIGH };
enum { GPIO_PULL_NONE, GPIO_PULL_DOWN, GPIO_PULL_UP };
static inline GPIO_Type *gpio_bank(uint16_t pin) {
static const GPIO_Type *g[] = {NULL, GPIO1, GPIO2, GPIO3, NULL, GPIO5};
return (GPIO_Type *) g[PINBANK(pin)];
}
// pin driver/pull-up/down configuration (ignore "keeper")
static inline void gpio_pad_config(uint16_t index, uint8_t type, uint8_t speed,
uint8_t pull) {
bool dopull = pull > 0;
if (dopull) --pull;
IOMUXC->SW_PAD_CTL_PAD[index] =
IOMUXC_SW_PAD_CTL_PAD_SPEED(speed) | IOMUXC_SW_PAD_CTL_PAD_ODE(type) |
IOMUXC_SW_PAD_CTL_PAD_SRE(speed >= GPIO_SPEED_HIGH) |
IOMUXC_SW_PAD_CTL_PAD_PUE(1) | IOMUXC_SW_PAD_CTL_PAD_PKE(dopull) |
IOMUXC_SW_PAD_CTL_PAD_PUS(pull) | IOMUXC_SW_PAD_CTL_PAD_DSE(7);
}
static inline void gpio_init(uint16_t pin, uint8_t mode, uint8_t type,
uint8_t speed, uint8_t pull) {
GPIO_Type *gpio = gpio_bank(pin);
uint8_t bit = (uint8_t) PINNO(pin);
uint32_t mask = (uint32_t) BIT(PINNO(pin));
clock_periph(4, CCM_CCGR4_CG1_SHIFT, CLOCK_ON_RUN_WAIT); // iomuxc_ipg_clk_s
switch (PINBANK(pin)) {
case 1:
gpio_mux_config(kIOMUXC_SW_MUX_CTL_PAD_GPIO_AD_B0_00 + bit, 5);
gpio_pad_config(kIOMUXC_SW_PAD_CTL_PAD_GPIO_AD_B0_00 + bit, type, speed,
pull);
clock_periph(1, CCM_CCGR1_CG13_SHIFT, CLOCK_ON_RUN_WAIT);
break;
case 2:
gpio_mux_config(kIOMUXC_SW_MUX_CTL_PAD_GPIO_B1_00 + bit, 5);
gpio_pad_config(kIOMUXC_SW_PAD_CTL_PAD_GPIO_B1_00 + bit, type, speed,
pull);
clock_periph(0, CCM_CCGR0_CG15_SHIFT, CLOCK_ON_RUN_WAIT);
break;
case 3:
gpio_mux_config(bit < 12 ? kIOMUXC_SW_MUX_CTL_PAD_GPIO_SD_B1_00 + bit
: bit < 18
? kIOMUXC_SW_MUX_CTL_PAD_GPIO_SD_B0_00 + bit - 12
: kIOMUXC_SW_MUX_CTL_PAD_GPIO_EMC_32 + bit - 18,
5);
gpio_pad_config(bit < 12 ? kIOMUXC_SW_PAD_CTL_PAD_GPIO_SD_B1_00 + bit
: bit < 18
? kIOMUXC_SW_PAD_CTL_PAD_GPIO_SD_B0_00 + bit - 12
: kIOMUXC_SW_PAD_CTL_PAD_GPIO_EMC_32 + bit - 18,
type, speed, pull);
clock_periph(2, CCM_CCGR2_CG13_SHIFT, CLOCK_ON_RUN_WAIT);
break;
case 5:
// TODO(): support sw_mux
clock_periph(1, CCM_CCGR1_CG15_SHIFT, CLOCK_ON_RUN_WAIT);
break;
default:
break;
}
gpio->IMR &= ~mask;
if (mode == GPIO_MODE_INPUT) {
gpio->GDIR &= ~mask;
} else {
gpio->GDIR |= mask;
}
}
static inline void gpio_input(uint16_t pin) {
gpio_init(pin, GPIO_MODE_INPUT, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_MEDIUM,
GPIO_PULL_NONE);
}
static inline void gpio_output(uint16_t pin) {
gpio_init(pin, GPIO_MODE_OUTPUT, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_MEDIUM,
GPIO_PULL_NONE);
}
static inline bool gpio_read(uint16_t pin) {
GPIO_Type *gpio = gpio_bank(pin);
uint32_t mask = (uint32_t) BIT(PINNO(pin));
return gpio->DR & mask;
}
static inline void gpio_write(uint16_t pin, bool value) {
GPIO_Type *gpio = gpio_bank(pin);
uint32_t mask = (uint32_t) BIT(PINNO(pin));
if (value) {
gpio->DR |= mask;
} else {
gpio->DR &= ~mask;
}
}
static inline void gpio_toggle(uint16_t pin) {
gpio_write(pin, !gpio_read(pin));
}
// 14.5 Table 14-4: uart_clk_root
// see sysinit.c for clocks, (14.7.9: defaults to pll3_80m = PLL3/6/1 = 80MHz)
static inline void uart_init(LPUART_Type *uart, unsigned long baud) {
uint8_t af = 2; // Alternate function
uint16_t mr = 0, pr = 0, mt = 0, pt = 0; // pins
uint32_t freq = 80000000; // uart_clk_root frequency
if (uart == LPUART1)
mt = kIOMUXC_SW_MUX_CTL_PAD_GPIO_AD_B0_12,
pt = kIOMUXC_SW_PAD_CTL_PAD_GPIO_AD_B0_12,
mr = kIOMUXC_SW_MUX_CTL_PAD_GPIO_AD_B0_13,
pr = kIOMUXC_SW_PAD_CTL_PAD_GPIO_AD_B0_13;
if (uart == LPUART3)
mt = kIOMUXC_SW_MUX_CTL_PAD_GPIO_AD_B1_06,
pt = kIOMUXC_SW_PAD_CTL_PAD_GPIO_AD_B1_06,
mr = kIOMUXC_SW_MUX_CTL_PAD_GPIO_AD_B1_07,
pr = kIOMUXC_SW_PAD_CTL_PAD_GPIO_AD_B1_07;
if (uart == LPUART1) clock_periph(5, CCM_CCGR5_CG12_SHIFT, CLOCK_ON_RUN_WAIT);
if (uart == LPUART3) clock_periph(0, CCM_CCGR0_CG6_SHIFT, CLOCK_ON_RUN_WAIT);
clock_periph(4, CCM_CCGR4_CG1_SHIFT, CLOCK_ON_RUN_WAIT); // iomuxc_ipg_clk_s
gpio_mux_config(mt, af);
gpio_pad_config(pt, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_MEDIUM, GPIO_PULL_UP);
gpio_mux_config(mr, af);
gpio_pad_config(pr, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_MEDIUM, GPIO_PULL_UP);
uart->GLOBAL |= LPUART_GLOBAL_RST_MASK; // reset, CTRL = 0, defaults
uart->GLOBAL &= ~LPUART_GLOBAL_RST_MASK;
SETBITS(uart->BAUD,
LPUART_BAUD_OSR_MASK | LPUART_BAUD_SBR_MASK | LPUART_BAUD_SBNS_MASK,
LPUART_BAUD_OSR(16 - 1) |
LPUART_BAUD_SBR(freq / (16 * baud))); // Rx sample at 16x
SETBITS(uart->CTRL,
LPUART_CTRL_PE_MASK | LPUART_CTRL_M_MASK | LPUART_CTRL_ILT_MASK |
LPUART_CTRL_IDLECFG_MASK,
LPUART_CTRL_IDLECFG(1) | LPUART_CTRL_ILT(1) |
LPUART_BAUD_SBNS(0)); // no parity, idle 2 chars after 1 stop bit
uart->CTRL |= LPUART_CTRL_TE_MASK | LPUART_CTRL_RE_MASK;
}
static inline void uart_write_byte(LPUART_Type *uart, uint8_t byte) {
uart->DATA = byte;
while ((uart->STAT & LPUART_STAT_TDRE_MASK) == 0) spin(1);
}
static inline void uart_write_buf(LPUART_Type *uart, char *buf, size_t len) {
while (len-- > 0) uart_write_byte(uart, *(uint8_t *) buf++);
}
static inline int uart_read_ready(LPUART_Type *uart) {
(void) uart;
return uart->STAT & LPUART_STAT_RDRF_MASK;
}
static inline uint8_t uart_read_byte(LPUART_Type *uart) {
return (uint8_t) (uart->DATA & 255);
}
static inline void rng_init(void) {
clock_periph(6, CCM_CCGR6_CG6_SHIFT, CLOCK_ON_RUN_WAIT); // trng_clk
SETBITS(TRNG->MCTL,
TRNG_MCTL_PRGM_MASK | TRNG_MCTL_ERR_MASK | TRNG_MCTL_RST_DEF_MASK,
TRNG_MCTL_PRGM(1) | TRNG_MCTL_ERR(1) |
TRNG_MCTL_RST_DEF(1)); // reset to default values
SETBITS(TRNG->MCTL, TRNG_MCTL_PRGM_MASK | TRNG_MCTL_ERR_MASK,
TRNG_MCTL_PRGM(0)); // set to run mode
(void) TRNG->ENT[TRNG_ENT_COUNT - 1]; // start new entropy generation
(void) TRNG->ENT[0]; // defect workaround
}
static inline uint32_t rng_read(void) {
static uint8_t idx = 0;
while ((TRNG->MCTL & TRNG_MCTL_ENT_VAL_MASK) == 0) (void) 0;
uint32_t data = TRNG->ENT[idx++]; // read data
idx %= TRNG_ENT_COUNT; // stay within array limits
if (idx == 0) // we've just read TRNG_ENT_COUNT - 1
(void) TRNG->ENT[0]; // defect workaround
return data;
}
// - PHY has no xtal, XI driven from ENET_REF_CLK1 (labeled as ENET_TX_REF_CLK
// (GPIO_AD_B1_10)), generated by the MCU
// - PHY RST connected to GPIO1.9 (GPIO_AD_B0_09); INTRP/NAND_TREE connected to
// GPIO1.10 (GPIO_AD_B0_10)
// - 41.4 REF_CLK1 is RMII mode reference clock for Rx, Tx, and SMI; it is I/O
// - 11.3.2 IOMUXC_GPR_GPR1
// - bit 13: ENET1_CLK_SEL --> 0 ENET1 TX reference clock driven by
// ref_enetpll and output via ENET_REF_CLK1 (labeled as ENET_REF_CLK
// elsewhere)
// - bit 17: ENET1_TX_CLK_DIR --> 1 ENET1_TX_CLK output driver enabled
// - 14.6.1.3.6 Ethernet PLL (PLL6)
// - 14.8.14: configure PLL6 to generate 50MHz clocks for ENET and RMII.
static inline void ethernet_init(void) {
// setup PLL and clock ENET from it
SETBITS(CCM_ANALOG->PLL_ENET, CCM_ANALOG_PLL_ENET_BYPASS_CLK_SRC_MASK,
CCM_ANALOG_PLL_ENET_BYPASS_MASK |
CCM_ANALOG_PLL_ENET_BYPASS_CLK_SRC(0)); // bypass to 24MHz osc
SETBITS(
CCM_ANALOG->PLL_ENET,
CCM_ANALOG_PLL_ENET_DIV_SELECT_MASK | CCM_ANALOG_PLL_ENET_POWERDOWN_MASK,
CCM_ANALOG_PLL_ENET_DIV_SELECT(1) | CCM_ANALOG_PLL_ENET_ENABLE_MASK);
while ((CCM_ANALOG->PLL_ENET & CCM_ANALOG_PLL_ENET_LOCK_MASK) == 0)
spin(1); // wait until it is stable
CCM_ANALOG->PLL_ENET &= ~CCM_ANALOG_PLL_ENET_BYPASS_MASK;
gpio_init(PIN('1', 9), GPIO_MODE_OUTPUT, GPIO_OTYPE_PUSH_PULL,
GPIO_SPEED_MEDIUM, GPIO_PULL_UP); // set GPIO1.9 as GPIO (PHY \RST)
gpio_write(PIN('1', 9), 0); // reset PHY
gpio_mux_config(kIOMUXC_SW_MUX_CTL_PAD_GPIO_B1_10,
6); // set for ENET_REF_CLK
IOMUXC->SW_MUX_CTL_PAD[kIOMUXC_SW_MUX_CTL_PAD_GPIO_B1_10] |=
IOMUXC_SW_MUX_CTL_PAD_SION(1); // loop signal back from pin
periph_mux_config(kIOMUXC_ENET_IPG_CLK_RMII_SELECT_INPUT,
1); // drive peripheral from B1_10, so RMII clock is taken
// from ENET_REF_CLK
gpio_pad_config(kIOMUXC_SW_PAD_CTL_PAD_GPIO_B1_10, GPIO_OTYPE_PUSH_PULL,
GPIO_SPEED_HIGH, GPIO_PULL_UP);
IOMUXC_GPR->GPR1 |=
IOMUXC_GPR_GPR1_ENET1_TX_CLK_DIR(1); // Set ENET_TX_CLK as output
gpio_mux_config(kIOMUXC_SW_MUX_CTL_PAD_GPIO_B1_04, 3); // set for RXDATA0
periph_mux_config(kIOMUXC_ENET0_RXDATA_SELECT_INPUT,
1); // drive peripheral from B1_04
gpio_pad_config(kIOMUXC_SW_PAD_CTL_PAD_GPIO_B1_04, GPIO_OTYPE_PUSH_PULL,
GPIO_SPEED_HIGH, GPIO_PULL_UP);
gpio_mux_config(kIOMUXC_SW_MUX_CTL_PAD_GPIO_B1_05, 3); // set for RXDATA1
periph_mux_config(kIOMUXC_ENET1_RXDATA_SELECT_INPUT,
1); // drive peripheral from B1_05
gpio_pad_config(kIOMUXC_SW_PAD_CTL_PAD_GPIO_B1_05, GPIO_OTYPE_PUSH_PULL,
GPIO_SPEED_HIGH, GPIO_PULL_UP);
gpio_mux_config(kIOMUXC_SW_MUX_CTL_PAD_GPIO_B1_06, 3); // set for CRS
periph_mux_config(kIOMUXC_ENET_RXEN_SELECT_INPUT,
1); // drive peripheral from B1_06
gpio_pad_config(kIOMUXC_SW_PAD_CTL_PAD_GPIO_B1_06, GPIO_OTYPE_PUSH_PULL,
GPIO_SPEED_HIGH, GPIO_PULL_UP);
gpio_mux_config(kIOMUXC_SW_MUX_CTL_PAD_GPIO_B1_07, 3); // set for TXDATA0
gpio_pad_config(kIOMUXC_SW_PAD_CTL_PAD_GPIO_B1_07, GPIO_OTYPE_PUSH_PULL,
GPIO_SPEED_HIGH, GPIO_PULL_UP);
gpio_mux_config(kIOMUXC_SW_MUX_CTL_PAD_GPIO_B1_08, 3); // set for TXDATA1
gpio_pad_config(kIOMUXC_SW_PAD_CTL_PAD_GPIO_B1_08, GPIO_OTYPE_PUSH_PULL,
GPIO_SPEED_HIGH, GPIO_PULL_UP);
gpio_mux_config(kIOMUXC_SW_MUX_CTL_PAD_GPIO_B1_09, 3); // set for TXEN
gpio_pad_config(kIOMUXC_SW_PAD_CTL_PAD_GPIO_B1_09, GPIO_OTYPE_PUSH_PULL,
GPIO_SPEED_HIGH, GPIO_PULL_UP);
gpio_mux_config(kIOMUXC_SW_MUX_CTL_PAD_GPIO_B1_11, 3); // set for RXERR
periph_mux_config(kIOMUXC_ENET_RXERR_SELECT_INPUT,
1); // drive peripheral from B0_12
gpio_pad_config(kIOMUXC_SW_PAD_CTL_PAD_GPIO_B1_11, GPIO_OTYPE_PUSH_PULL,
GPIO_SPEED_HIGH, GPIO_PULL_UP);
gpio_mux_config(kIOMUXC_SW_MUX_CTL_PAD_GPIO_EMC_40, 4); // set for MDC
gpio_pad_config(kIOMUXC_SW_PAD_CTL_PAD_GPIO_EMC_40, GPIO_OTYPE_PUSH_PULL,
GPIO_SPEED_MEDIUM, GPIO_PULL_UP);
gpio_mux_config(kIOMUXC_SW_MUX_CTL_PAD_GPIO_EMC_41, 4); // set for MDIO
periph_mux_config(kIOMUXC_ENET_MDIO_SELECT_INPUT,
1); // drive peripheral from EMC_41
gpio_pad_config(kIOMUXC_SW_PAD_CTL_PAD_GPIO_EMC_41, GPIO_OTYPE_PUSH_PULL,
GPIO_SPEED_MEDIUM, GPIO_PULL_UP);
gpio_init(PIN('1', 10), GPIO_MODE_OUTPUT, GPIO_OTYPE_PUSH_PULL,
GPIO_SPEED_MEDIUM,
GPIO_PULL_UP); // set GPIO1.10 as GPIO (PHY INTRP/NAND_TREE)
gpio_write(PIN('1', 10), 1); // prevent NAND_TREE
spin(10000); // keep PHY RST low for a while
gpio_write(PIN('1', 9), 1); // deassert RST
gpio_init(PIN('1', 10), GPIO_MODE_INPUT, 0, GPIO_SPEED_MEDIUM,
GPIO_PULL_UP); // setup IRQ (pulled-up)(not used)
clock_periph(1, CCM_CCGR1_CG5_SHIFT, CLOCK_ON_RUN_WAIT); // enet_ipg_clk
NVIC_EnableIRQ(ENET_IRQn); // Setup Ethernet IRQ handler
}
// Helper macro for MAC generation, byte reads not allowed
#define GENERATE_LOCALLY_ADMINISTERED_MAC() \
{ \
2, OCOTP->CFG0 & 255, (OCOTP->CFG0 >> 10) & 255, \
((OCOTP->CFG0 >> 19) ^ (OCOTP->CFG1 >> 19)) & 255, \
(OCOTP->CFG1 >> 10) & 255, OCOTP->CFG1 & 255 \
}
// NOTE: You can fuse your own MAC and read it from OCOTP->MAC0, OCOTP->MAC1,
// OCOTP->MAC2
static inline void flash_init(void) { // QSPI in FlexSPI
// set pins
clock_periph(4, CCM_CCGR4_CG1_SHIFT, CLOCK_ON_RUN_WAIT); // iomuxc_ipg_clk_s
gpio_mux_config(kIOMUXC_SW_MUX_CTL_PAD_GPIO_SD_B1_05, 1); // set for DQS
IOMUXC->SW_MUX_CTL_PAD[kIOMUXC_SW_MUX_CTL_PAD_GPIO_SD_B1_05] |= IOMUXC_SW_MUX_CTL_PAD_SION(1); // loop signal back from pin
periph_mux_config(kIOMUXC_FLEXSPIA_DQS_SELECT_INPUT, 0); // drive peripheral from B1_05
gpio_pad_config(kIOMUXC_SW_PAD_CTL_PAD_GPIO_SD_B1_05, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_HIGH, GPIO_PULL_NONE);
gpio_mux_config(kIOMUXC_SW_MUX_CTL_PAD_GPIO_SD_B1_06, 1); // set for SS
IOMUXC->SW_MUX_CTL_PAD[kIOMUXC_SW_MUX_CTL_PAD_GPIO_SD_B1_06] |= IOMUXC_SW_MUX_CTL_PAD_SION(1); // loop signal back from pin
gpio_pad_config(kIOMUXC_SW_PAD_CTL_PAD_GPIO_SD_B1_06, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_HIGH, GPIO_PULL_NONE);
gpio_mux_config(kIOMUXC_SW_MUX_CTL_PAD_GPIO_SD_B1_07, 1); // set for SCLK
IOMUXC->SW_MUX_CTL_PAD[kIOMUXC_SW_MUX_CTL_PAD_GPIO_SD_B1_07] |= IOMUXC_SW_MUX_CTL_PAD_SION(1); // loop signal back from pin
periph_mux_config(kIOMUXC_FLEXSPIA_SCK_SELECT_INPUT, 0); // drive peripheral from B1_07
gpio_pad_config(kIOMUXC_SW_PAD_CTL_PAD_GPIO_SD_B1_07, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_HIGH, GPIO_PULL_NONE);
gpio_mux_config(kIOMUXC_SW_MUX_CTL_PAD_GPIO_SD_B1_08, 1); // set for DATA0
IOMUXC->SW_MUX_CTL_PAD[kIOMUXC_SW_MUX_CTL_PAD_GPIO_SD_B1_08] |= IOMUXC_SW_MUX_CTL_PAD_SION(1); // loop signal back from pin
periph_mux_config(kIOMUXC_FLEXSPIA_DATA0_SELECT_INPUT, 0); // drive peripheral from B1_08
gpio_pad_config(kIOMUXC_SW_PAD_CTL_PAD_GPIO_SD_B1_08, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_HIGH, GPIO_PULL_NONE);
gpio_mux_config(kIOMUXC_SW_MUX_CTL_PAD_GPIO_SD_B1_09, 1); // set for DATA1
IOMUXC->SW_MUX_CTL_PAD[kIOMUXC_SW_MUX_CTL_PAD_GPIO_SD_B1_09] |= IOMUXC_SW_MUX_CTL_PAD_SION(1); // loop signal back from pin
periph_mux_config(kIOMUXC_FLEXSPIA_DATA1_SELECT_INPUT, 0); // drive peripheral from B1_09
gpio_pad_config(kIOMUXC_SW_PAD_CTL_PAD_GPIO_SD_B1_09, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_HIGH, GPIO_PULL_NONE);
gpio_mux_config(kIOMUXC_SW_MUX_CTL_PAD_GPIO_SD_B1_10, 1); // set for DATA2
IOMUXC->SW_MUX_CTL_PAD[kIOMUXC_SW_MUX_CTL_PAD_GPIO_SD_B1_10] |= IOMUXC_SW_MUX_CTL_PAD_SION(1); // loop signal back from pin
periph_mux_config(kIOMUXC_FLEXSPIA_DATA2_SELECT_INPUT, 0); // drive peripheral from B1_10
gpio_pad_config(kIOMUXC_SW_PAD_CTL_PAD_GPIO_SD_B1_10, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_HIGH, GPIO_PULL_NONE);
gpio_mux_config(kIOMUXC_SW_MUX_CTL_PAD_GPIO_SD_B1_11, 1); // set for DATA3
IOMUXC->SW_MUX_CTL_PAD[kIOMUXC_SW_MUX_CTL_PAD_GPIO_SD_B1_11] |= IOMUXC_SW_MUX_CTL_PAD_SION(1); // loop signal back from pin
periph_mux_config(kIOMUXC_FLEXSPIA_DATA3_SELECT_INPUT, 0); // drive peripheral from B1_11
gpio_pad_config(kIOMUXC_SW_PAD_CTL_PAD_GPIO_SD_B1_11, GPIO_OTYPE_PUSH_PULL, GPIO_SPEED_HIGH, GPIO_PULL_NONE);
// set FlexSPI clock
SETBITS(CCM->CSCMR1, CCM_CSCMR1_FLEXSPI_CLK_SEL_MASK | CCM_CSCMR1_FLEXSPI_PODF_MASK, CCM_CSCMR1_FLEXSPI_CLK_SEL(3) | CCM_CSCMR1_FLEXSPI_PODF(7)); // select PLL3 PFD0 /8
clock_periph(6, CCM_CCGR6_CG5_SHIFT, CLOCK_ON_RUN_WAIT); // enable
}
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