本文展示了一个基于STM32F1和FreeRTOS的双LED控制程序。主要内容包括：

1. 系统配置：使用HSI时钟源通过PLL倍频至64MHz，配置系统时钟和外设时钟

2. GPIO初始化：设置PA1-PA3为红色LED输出，PB0-PB2为绿色LED输出

3. FreeRTOS任务创建：

   • TaskRedLED：以400ms周期切换红色LED组
   • TaskGreenLED：以1000ms周期切换绿色LED组

4. 辅助功能：

   • 系统时钟配置
   • 错误处理函数
   • 数字转换工具函数

程序采用FreeRTOS实时操作系统管理两个独立LED控制任务，实现不同频率的LED闪烁效果，展示了基本的RTOS任务创建和调度方法。

main.c

/** ****************************************************************************** * File Name : main.c * Description : Dual LED Toggle with FreeRTOS (native API) ****************************************************************************** */ /* Includes ------------------------------------------------------------------*/ #include "stm32f1xx_hal.h" #include "FreeRTOS.h" #include "task.h" /* Peripheral handles (required by other modules for linker resolution) */ DMA_HandleTypeDef hdma_spi1_tx; DMA_HandleTypeDef hdma_usart1_tx; SPI_HandleTypeDef hspi1; UART_HandleTypeDef huart1; /* Private function prototypes -----------------------------------------------*/ void SystemClock_Config(void); void Error_Handler(void); static void MX_GPIO_Init(void); static void TaskRedLED(void *pvParameters); static void TaskGreenLED(void *pvParameters); int main(void) { /* MCU Configuration----------------------------------------------------------*/ HAL_Init(); /* Configure the system clock */ SystemClock_Config(); /* Initialize all configured peripherals */ MX_GPIO_Init(); /* Create the Red LED toggle task (PA1/PA2/PA3), period = 400ms */ xTaskCreate(TaskRedLED, "RedLED", configMINIMAL_STACK_SIZE, NULL, tskIDLE_PRIORITY + 1, NULL); /* Create the Green LED toggle task (PB0/PB1/PB2), period = 1000ms */ xTaskCreate(TaskGreenLED, "GreenLED", configMINIMAL_STACK_SIZE, NULL, tskIDLE_PRIORITY + 1, NULL); /* Start scheduler */ vTaskStartScheduler(); /* We should never get here as control is now taken by the scheduler */ while (1) { } } /** System Clock Configuration * HSI -> PLL (x16) -> 64MHz SYSCLK, HCLK=32MHz, APB1=8MHz, APB2=16MHz */ void SystemClock_Config(void) { RCC_OscInitTypeDef RCC_OscInitStruct; RCC_ClkInitTypeDef RCC_ClkInitStruct; RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI; RCC_OscInitStruct.HSIState = RCC_HSI_ON; RCC_OscInitStruct.HSICalibrationValue = 16; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI_DIV2; RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL16; if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { Error_Handler(); } RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2; RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV2; RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK) { Error_Handler(); } HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq() / 1000); HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK); /* SysTick_IRQn interrupt configuration */ HAL_NVIC_SetPriority(SysTick_IRQn, 15, 0); } /** Configure GPIO pins for LED control * PA1/PA2/PA3 -> Red LED (Output Push-Pull) * PB0/PB1/PB2 -> Green LED (Output Push-Pull) */ static void MX_GPIO_Init(void) { GPIO_InitTypeDef GPIO_InitStruct; /* GPIO Ports Clock Enable */ __HAL_RCC_GPIOA_CLK_ENABLE(); __HAL_RCC_GPIOB_CLK_ENABLE(); /* Configure PA1, PA2, PA3 as output push-pull for Red LED */ GPIO_InitStruct.Pin = GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_3; 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); /* Configure PB0, PB1, PB2 as output push-pull for Green LED */ GPIO_InitStruct.Pin = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; HAL_GPIO_Init(GPIOB, &GPIO_InitStruct); /* Set initial output level low (LEDs off) */ HAL_GPIO_WritePin(GPIOA, GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_3, GPIO_PIN_RESET); HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2, GPIO_PIN_RESET); } /* TaskRedLED: Toggle Red LED on PA1/PA2/PA3, period = 400ms */ static void TaskRedLED(void *pvParameters) { for(;;) { HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_1 | GPIO_PIN_2 | GPIO_PIN_3); vTaskDelay(pdMS_TO_TICKS(200)); } } /* TaskGreenLED: Toggle Green LED on PB0/PB1/PB2, period = 1000ms */ static void TaskGreenLED(void *pvParameters) { for(;;) { HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2); vTaskDelay(pdMS_TO_TICKS(500)); } } /* TIM1 Period Elapsed Callback - provides HAL time base */ void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) { if (htim->Instance == TIM1) { HAL_IncTick(); } } /* itoa: convert n to characters in s (required by SSD1306 module) */ void itoa(int n, char s[]) { int i, sign; if ((sign = n) < 0) n = -n; i = 0; do { s[i++] = n % 10 + '0'; } while ((n /= 10) > 0); if (sign < 0) s[i++] = '-'; s[i] = '\0'; /* reverse the string */ int j, k; char c; for (j = 0, k = i - 1; j < k; j++, k--) { c = s[j]; s[j] = s[k]; s[k] = c; } } /** * @brief This function is executed in case of error occurrence. */ void Error_Handler(void) { while(1) { } } #ifdef USE_FULL_ASSERT /** * @brief Reports the name of the source file and the source line number * where the assert_param error has occurred. */ void assert_failed(uint8_t* file, uint32_t line) { /* 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) */ } #endif /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/