Хочу поморгать диодом без библиотек. В целом сетап описан тут. Процессор STM32F030F4P6. Диод подключен, насколько я могу судить, к ноге PA4.
На текущий момент конфигурация такая:
Makefile:
CC = arm-none-eabi-gcc
AS = arm-none-eabi-as
LD = arm-none-eabi-ld
CFLAGS = -mthumb -mcpu=cortex-m0 -O0
.PHONY: all flash
all: app.bin
crt.o: crt.s
app.elf: linker.ld crt.o blink.o
$(LD) -T linker.ld -o app.elf crt.o blink.o
app.bin: app.elf
arm-none-eabi-objcopy -O binary $< $@
flash: app.bin
st-flash --reset write $< 0x8000000
crt.s:
.cpu cortex-m3
.thumb
.word 0x20005000
.word _reset
.thumb_func
_reset:
bl blink
b .
linker.ld:
MEMORY {
FLASH(rx): ORIGIN = 0x08000000, LENGTH = 16K
RAM (xrw): ORIGIN = 0x20000000, LENGTH = 4K
}
blink.c:
#include <stdint.h>
const uint32_t RCC_BASE = 0x40021000;
const uint32_t GPIOA_BASE = 0x48000000;
const uint32_t RCC_AHBENR_OFFSET = 0x14;
const uint8_t RCC_AHBENR_IOPAEN_BIT = 17;
const uint32_t GPIOx_MODER_OFFSET = 0x00;
const uint8_t GPIOx_MODER_MODE4_BIT_OFFSET = 8;
const uint32_t GPIOx_ODR_OFFSET = 0x14;
const uint8_t GPIOx_ODR_OD4_BIT = 4;
void bit_clear(uint32_t address, uint8_t bit);
void bit_set(uint32_t address, uint8_t bit);
void bit_toggle(uint32_t address, uint8_t bit);
void blink(void) {
bit_set(RCC_BASE + RCC_AHBENR_OFFSET, RCC_AHBENR_IOPAEN_BIT);
bit_set(GPIOA_BASE + GPIOx_MODER_OFFSET, GPIOx_MODER_MODE4_BIT_OFFSET);
bit_set(GPIOA_BASE + GPIOx_ODR_OFFSET, GPIOx_ODR_OD4_BIT);
volatile uint32_t counter = 0;
while (1) {
if (counter % 0x10000 == 0) {
bit_toggle(GPIOA_BASE + GPIOx_ODR_OFFSET, GPIOx_ODR_OD4_BIT);
}
counter++;
}
}
void bit_clear(uint32_t address, uint8_t bit) {
uint32_t mask = 1 << bit;
volatile uint32_t *ptr = (uint32_t *) address;
*ptr &= ~mask;
}
void bit_set(uint32_t address, uint8_t bit) {
uint32_t mask = 1 << bit;
volatile uint32_t *ptr = (uint32_t *) address;
*ptr |= mask;
}
void bit_toggle(uint32_t address, uint8_t bit) {
uint32_t mask = 1 << bit;
volatile uint32_t *ptr = (uint32_t *) address;
*ptr ^= mask;
}
Адреса брал из RM0360:
2.2.2 Memory map and register boundary addresses
AHB2 0x4800 0000 - 0x4800 03FF GPIOA
AHB1 0x4002 1000 - 0x4002 13FF RCC
7.4.6
Reset and clock control (RCC)
AHB peripheral clock enable register (RCC_AHBENR)
Address offset: 0x14
Bit 17: IOPAEN: I/O port A clock enable
8.4.1
GPIO port mode register (GPIOx_MODER)
Address offset:0x00
Bits 9:8 Port configuration bits
01: General purpose output mode
8.4.6
GPIO port output data register (GPIOx_ODR)
Address offset: 0x14
Bit 4: Port output databit
Насколько я понял из чтения документации:
- Нужно настроить регистр RCC_AHBENR и включить I/O port A.
- Нужно настроить регистр GPIOx_MODER и включить output mode для PA4.
- Для включения/выключения диода нужно менять бит GPIOx_ODR.
Возможно код на C неправильный, я его знаю плохо, пытался писать максимально просто.
На CubeMX пример с HAL копипастил, он работает, диод моргает. Ниже приведу на всякий случай:
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* Copyright (c) 2023 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
/* USER CODE BEGIN 2 */
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_4);
HAL_Delay(100);
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
{
Error_Handler();
}
}
/**
* @brief GPIO Initialization Function
* @param None
* @retval None
*/
static void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOA_CLK_ENABLE();
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_RESET);
/*Configure GPIO pin : PA4 */
GPIO_InitStruct.Pin = GPIO_PIN_4;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}
/* USER CODE BEGIN 4 */
/* USER CODE END 4 */
/**
* @brief This function is executed in case of error occurrence.
* @retval None
*/
void Error_Handler(void)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* User can add his own implementation to report the HAL error return state */
__disable_irq();
while (1)
{
}
/* USER CODE END Error_Handler_Debug */
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t *file, uint32_t line)
{
/* USER CODE BEGIN 6 */
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
Но я в нём ничего не понимаю, хотелось бы попроще.
