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106 lines
3.7 KiB
C
106 lines
3.7 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 "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_MODE_IN, GPIO_MODE_OUT, GPIO_MODE_AF, GPIO_MODE_ANALOG };
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enum { GPIO_TYPE_PP, GPIO_TYPE_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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enum {
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OUTPUT = GPIO_MODE_OUT | (GPIO_TYPE_PP << 2) | (GPIO_SPEED_MEDIUM << 3) |
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(GPIO_PULL_NONE << 5),
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INPUT = GPIO_MODE_IN | (GPIO_TYPE_PP << 2) | (GPIO_SPEED_MEDIUM << 3) |
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(GPIO_PULL_NONE << 5),
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INPUT_PULLUP = GPIO_MODE_IN | (GPIO_TYPE_PP << 2) | (GPIO_SPEED_MEDIUM << 3) |
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(GPIO_PULL_UP << 5),
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};
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static inline void gpio_init(uint16_t pin, uint8_t state) {
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GPIO_TypeDef *gpio = gpio_bank(pin);
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uint8_t n = pin & 255, mode = state & 3, type = (state >> 2) & 1,
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speed = (state >> 3) & 3, pupdr = (state >> 5) & 3;
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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 |= (pupdr << (n * 2));
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}
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static inline void init_ram(void) {
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extern uint32_t _bss_start, _bss_end;
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extern uint32_t _data_start, _data_end, _data_flash_start;
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memset(&_bss_start, 0, ((char *) &_bss_end - (char *) &_bss_start));
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memcpy(&_data_start, &_data_flash_start,
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((char *) &_data_end - (char *) &_data_start));
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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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}
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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_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); // Init GPIO banks A,B,C
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gpio_init(LED1, OUTPUT);
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gpio_init(LED2, OUTPUT);
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gpio_init(LED3, OUTPUT);
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}
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