/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* Copyright (c) 2025 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"
#include "dma.h"
#include "usart.h"
#include "gpio.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include <string.h>
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
#define UART_DMA_BUFFER_SIZE 128U /* 单次回显缓存大小 */
/* 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);
/* USER CODE BEGIN PFP */
static HAL_StatusTypeDef uart_restart_rx_dma(void);
static void uart_send_string(const char *msg);
static void uart_send_banner(void);
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
static uint8_t g_uart_rx_buffer[UART_DMA_BUFFER_SIZE];
static uint8_t g_uart_tx_buffer[UART_DMA_BUFFER_SIZE];
/* 重新启动串口空闲中断 DMA 接收，始终准备下一帧数据 */
static HAL_StatusTypeDef uart_restart_rx_dma(void)
{
HAL_StatusTypeDef status = HAL_UARTEx_ReceiveToIdle_DMA(&huart2,
g_uart_rx_buffer,
UART_DMA_BUFFER_SIZE);
if (status == HAL_OK)
{
if (huart2.hdmarx != NULL)
{
__HAL_DMA_DISABLE_IT(huart2.hdmarx, DMA_IT_HT);
}
}
return status;
}
/* 阻塞方式发送字符串，主要用于提示和回显 */
static void uart_send_string(const char *msg)
{
if ((msg == NULL) || (*msg == '\0'))
{
return;
}
const size_t length = strlen(msg);
if (length == 0U)
{
return;
}
if (HAL_UART_Transmit(&huart2,
(uint8_t *)msg,
(uint16_t)length,
HAL_MAX_DELAY) != HAL_OK)
{
Error_Handler();
}
}
/* 打印启动提示，告知用户当前示例用途 */
static void uart_send_banner(void)
{
uart_send_string("\r\nRocketPi UART echo ready.\r\n");
uart_send_string("Type any text and it will be echoed back.\r\n> ");
}
/* 串口接收到一帧数据后立即回显，并重新打开 DMA 接收 */
void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size)
{
if ((huart != &huart2) || (Size == 0U))
{
return;
}
const uint16_t copy_size = (Size <= UART_DMA_BUFFER_SIZE) ? Size : UART_DMA_BUFFER_SIZE;
memcpy(g_uart_tx_buffer, g_uart_rx_buffer, copy_size);
if (uart_restart_rx_dma() != HAL_OK)
{
Error_Handler();
}
if (HAL_UART_Transmit(&huart2, g_uart_tx_buffer, copy_size, HAL_MAX_DELAY) != HAL_OK)
{
Error_Handler();
}
}
/* 若发生串口错误则重新启动 DMA 接收，保证示例持续运行 */
void HAL_UART_ErrorCallback(UART_HandleTypeDef *huart)
{
if (huart != &huart2)
{
return;
}
if (uart_restart_rx_dma() != HAL_OK)
{
Error_Handler();
}
}
/* 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();
MX_DMA_Init();
MX_USART2_UART_Init();
/* USER CODE BEGIN 2 */
/* 上电后先启动 DMA 接收，再输出提示信息 */
if (uart_restart_rx_dma() != HAL_OK)
{
Error_Handler();
}
uart_send_banner();
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
HAL_Delay(1);
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Configure the main internal regulator output voltage
*/
__HAL_RCC_PWR_CLK_ENABLE();
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLM = 4;
RCC_OscInitStruct.PLL.PLLN = 84;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
RCC_OscInitStruct.PLL.PLLQ = 4;
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_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
{
Error_Handler();
}
}
/* 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 */
