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https://github.com/cesanta/mongoose.git
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136 lines
4.9 KiB
C
136 lines
4.9 KiB
C
// Copyright (c) 2018-2021 Cesanta Software Limited
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// All rights reserved
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// https://www.st.com/resource/en/reference_manual/dm00124865-stm32f75xxx-and-stm32f74xxx-advanced-arm-based-32-bit-mcus-stmicroelectronics.pdf
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// Memory map: 2.2.2
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#include "stm32f746xx.h"
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//#include "stm32f7xx_hal.h"
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#include "string.h"
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#define BIT(x) ((uint32_t) 1 << (x))
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#define PIN(bank, num) ((((bank) - 'A') << 8) | (num))
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static inline void spin(uint32_t count) {
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while (count--) asm("nop");
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}
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static inline GPIO_TypeDef *gpio_bank(uint16_t pin) {
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return (GPIO_TypeDef *) (0x40020000 + 0x400 * (pin >> 8));
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}
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static inline void gpio_on(uint16_t pin) {
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gpio_bank(pin)->ODR |= BIT(pin & 255);
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}
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static inline void gpio_off(uint16_t pin) {
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gpio_bank(pin)->ODR &= ~BIT(pin & 255);
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}
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static inline void gpio_toggle(uint16_t pin) {
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gpio_bank(pin)->ODR ^= BIT(pin & 255);
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}
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enum { GPIO_IN, GPIO_OUT, GPIO_AF, GPIO_ANALOG };
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enum { GPIO_PP, GPIO_OD };
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enum { GPIO_SPEED_LOW, GPIO_SPEED_MEDIUM, GPIO_SPEED_HIGH, GPIO_SPEED_INSANE };
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enum { GPIO_PULL_NONE, GPIO_PULL_UP, GPIO_PULL_DOWN };
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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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GPIO_TypeDef *gpio = gpio_bank(pin);
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uint8_t n = pin & 255;
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gpio->MODER &= ~(3 << (n * 2));
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gpio->MODER |= (mode << (n * 2));
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gpio->OTYPER &= ~(1 << n);
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gpio->OTYPER |= (type << n);
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gpio->OSPEEDR &= ~(3 << (n * 2));
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gpio->OSPEEDR |= (speed << (n * 2));
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gpio->PUPDR &= ~(3 << (n * 2));
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gpio->PUPDR |= (pull << (n * 2));
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if (n < 8) {
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gpio->AFR[0] &= 15 << (n * 4);
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gpio->AFR[0] |= af << (n * 4);
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} else {
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gpio->AFR[1] &= 15 << (n * 4);
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gpio->AFR[1] |= af << (n * 4);
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}
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}
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static inline void init_clock(void) {
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RCC->CR |= RCC_CR_HSEBYP | RCC_CR_HSEON; // Start HSE
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while ((RCC->CR & RCC_CR_HSERDY) == 0) (void) 0;
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#define PLL_M 8 // 8MHz HSE down-to 1MHz PLL input
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#define PLL_N 432 // 432 MHz VCO output
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#define PLL_P 2 // 216 MHz PLL output
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#define PLL_Q 9 // 48 MHz (USB)
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RCC->PLLCFGR = PLL_M | (PLL_N << 6) | (((PLL_P >> 1) - 1) << 16) |
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(RCC_PLLCFGR_PLLSRC_HSE) | (PLL_Q << 24);
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RCC->CR |= RCC_CR_PLLON; // Enable the main PLL
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FLASH->ACR = FLASH_ACR_ARTEN | FLASH_ACR_PRFTEN | FLASH_ACR_LATENCY_4WS;
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// Configure AHB/APB prescalers
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// AHB Prescaler = /1 -> 216 MHz
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// APB1 Prescaler = /4 -> 54 MHz
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// APB2 Prescaler = /2 -> 108 MHz
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RCC->CFGR |= RCC_CFGR_HPRE_DIV1;
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RCC->CFGR |= RCC_CFGR_PPRE2_DIV2;
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RCC->CFGR |= RCC_CFGR_PPRE1_DIV4;
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while ((RCC->CR & RCC_CR_PLLRDY) == 0) (void) 0;
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RCC->CFGR &= ~RCC_CFGR_SW; // Select the main PLL
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RCC->CFGR |= RCC_CFGR_SW_PLL; // as system clock source
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while ((RCC->CFGR & RCC_CFGR_SWS) == 0) (void) 0;
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// Ethernet clock
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RCC->AHB1ENR |= RCC_AHB1ENR_ETHMACEN;
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RCC->AHB1ENR |= RCC_AHB1ENR_ETHMACTXEN;
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RCC->AHB1ENR |= RCC_AHB1ENR_ETHMACRXEN;
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}
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#define delay(ms) vTaskDelay(pdMS_TO_TICKS(ms))
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#define LED1 PIN('B', 0) // On-board LED pin
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#define LED2 PIN('B', 7) // On-board LED pin
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#define LED3 PIN('B', 14) // On-board LED pin
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static inline void led_toggle(void) {
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gpio_toggle(LED2);
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}
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static inline void init_ram(void) {
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extern uint32_t _sbss, _ebss;
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extern uint32_t _sdata, _edata, _sidata;
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memset(&_sbss, 0, ((char *) &_ebss - (char *) &_sbss));
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memcpy(&_sdata, &_sidata, ((char *) &_edata - (char *) &_sdata));
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}
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static inline void init_hardware(void) {
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init_ram();
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init_clock();
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RCC->AHB1ENR |= BIT(0) | BIT(1) | BIT(2) | BIT(6); // Init GPIO banks A,B,C,G
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gpio_init(LED1, GPIO_OUT, GPIO_PP, GPIO_SPEED_LOW, GPIO_PULL_NONE, 0);
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gpio_init(LED2, GPIO_OUT, GPIO_PP, GPIO_SPEED_LOW, GPIO_PULL_NONE, 0);
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gpio_init(LED3, GPIO_OUT, GPIO_PP, GPIO_SPEED_LOW, GPIO_PULL_NONE, 0);
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gpio_on(LED2);
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#if 0
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uint16_t a1 = PIN('A', 1), a2 = PIN('A', 2), a7 = PIN('A', 7);
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gpio_init(a1, GPIO_AF, GPIO_PP, GPIO_SPEED_INSANE, GPIO_PULL_NONE, 11);
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gpio_init(a2, GPIO_AF, GPIO_PP, GPIO_SPEED_INSANE, GPIO_PULL_NONE, 11);
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gpio_init(a7, GPIO_AF, GPIO_PP, GPIO_SPEED_INSANE, GPIO_PULL_NONE, 11);
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uint16_t b13 = PIN('B', 13);
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gpio_init(b13, GPIO_AF, GPIO_PP, GPIO_SPEED_INSANE, GPIO_PULL_NONE, 11);
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uint16_t c1 = PIN('C', 1), c4 = PIN('C', 4), c5 = PIN('C', 5);
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gpio_init(c1, GPIO_AF, GPIO_PP, GPIO_SPEED_INSANE, GPIO_PULL_NONE, 11);
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gpio_init(c4, GPIO_AF, GPIO_PP, GPIO_SPEED_INSANE, GPIO_PULL_NONE, 11);
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gpio_init(c5, GPIO_AF, GPIO_PP, GPIO_SPEED_INSANE, GPIO_PULL_NONE, 11);
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uint16_t g2 = PIN('G', 2), g11 = PIN('G', 11), g13 = PIN('G', 13),
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g14 = PIN('G', 14);
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gpio_init(g2, GPIO_AF, GPIO_PP, GPIO_SPEED_INSANE, GPIO_PULL_NONE, 11);
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gpio_init(g11, GPIO_AF, GPIO_PP, GPIO_SPEED_INSANE, GPIO_PULL_NONE, 11);
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gpio_init(g13, GPIO_AF, GPIO_PP, GPIO_SPEED_INSANE, GPIO_PULL_NONE, 11);
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gpio_init(g14, GPIO_AF, GPIO_PP, GPIO_SPEED_INSANE, GPIO_PULL_NONE, 11);
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HAL_Init();
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HAL_NVIC_SetPriority(ETH_IRQn, 0x7, 0);
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HAL_NVIC_EnableIRQ(ETH_IRQn);
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#endif
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}
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