实现串口驱动，移植方便

HAL/Src/hal_uart.c

@@ -0,0 +1,154 @@
+/* USER CODE BEGIN Header */
+/**
+  ******************************************************************************
+  * @file           : hal_uart.c
+  * @brief          : UART hardware abstraction layer source file
+  ******************************************************************************
+  */
+/* USER CODE END Header */
+
+#include "hal_uart.h"
+#include "stm32f4xx_hal.h"
+#include "stm32f4xx_hal_uart.h"
+
+/* UART handle */
+static UART_HandleTypeDef huart1;
+
+/**
+ * @brief Initialize UART hardware
+ */
+void hal_uart_init(void) {
+    /* UART initialization is handled by HAL_Init() */
+    
+    /* Configure UART GPIO pins */
+    GPIO_InitTypeDef GPIO_InitStruct = {0};
+    
+    /* Enable UART clock */
+    __HAL_RCC_USART1_CLK_ENABLE();
+    
+    /* Enable GPIO clocks */
+    __HAL_RCC_GPIOA_CLK_ENABLE();
+    
+    /* Configure USART1 Tx (PA9) as alternate function push-pull */
+    GPIO_InitStruct.Pin = GPIO_PIN_9;
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
+    GPIO_InitStruct.Alternate = GPIO_AF7_USART1;
+    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+    
+    /* Configure USART1 Rx (PA10) as alternate function push-pull */
+    GPIO_InitStruct.Pin = GPIO_PIN_10;
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
+    GPIO_InitStruct.Alternate = GPIO_AF7_USART1;
+    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+    
+    /* Initialize UART */
+    huart1.Instance = USART1;
+    huart1.Init.BaudRate = 115200;
+    huart1.Init.WordLength = UART_WORDLENGTH_8B;
+    huart1.Init.StopBits = UART_STOPBITS_1;
+    huart1.Init.Parity = UART_PARITY_NONE;
+    huart1.Init.Mode = UART_MODE_TX_RX;
+    huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
+    huart1.Init.OverSampling = UART_OVERSAMPLING_16;
+    
+    if (HAL_UART_Init(&huart1) != HAL_OK) {
+        /* Initialization Error */
+        while (1);
+    }
+}
+
+/**
+ * @brief Configure UART parameters
+ * @param config: UART configuration structure
+ */
+void hal_uart_config(const hal_uart_config_t *config) {
+    if (config == NULL) {
+        return;
+    }
+    
+    /* Update UART configuration */
+    huart1.Init.BaudRate = config->baudrate;
+    
+    /* Convert parity */
+    switch (config->parity) {
+        case HAL_UART_PARITY_NONE:
+            huart1.Init.Parity = UART_PARITY_NONE;
+            break;
+        case HAL_UART_PARITY_ODD:
+            huart1.Init.Parity = UART_PARITY_ODD;
+            break;
+        case HAL_UART_PARITY_EVEN:
+            huart1.Init.Parity = UART_PARITY_EVEN;
+            break;
+        default:
+            huart1.Init.Parity = UART_PARITY_NONE;
+            break;
+    }
+    
+    /* Convert stop bits */
+    huart1.Init.StopBits = (config->stopbits == HAL_UART_STOPBITS_1) ? 
+                           UART_STOPBITS_1 : UART_STOPBITS_2;
+    
+    /* Convert data bits */
+    huart1.Init.WordLength = (config->databits == HAL_UART_DATABITS_8) ? 
+                            UART_WORDLENGTH_8B : UART_WORDLENGTH_9B;
+    
+    /* Re-initialize UART */
+    if (HAL_UART_Init(&huart1) != HAL_OK) {
+        /* Initialization Error */
+        while (1);
+    }
+}
+
+/**
+ * @brief Send data over UART
+ * @param data: Pointer to data buffer
+ * @param length: Data length in bytes
+ */
+void hal_uart_send(const uint8_t *data, size_t length) {
+    if (data == NULL || length == 0) {
+        return;
+    }
+    
+    HAL_UART_Transmit(&huart1, (uint8_t *)data, length, HAL_MAX_DELAY);
+}
+
+/**
+ * @brief Receive data over UART
+ * @param data: Pointer to data buffer
+ * @param length: Data length to receive in bytes
+ * @retval Number of bytes received
+ */
+size_t hal_uart_receive(uint8_t *data, size_t length) {
+    if (data == NULL || length == 0) {
+        return 0;
+    }
+    
+    HAL_StatusTypeDef status = HAL_UART_Receive(&huart1, data, length, HAL_MAX_DELAY);
+    
+    if (status == HAL_OK) {
+        return length;
+    }
+    
+    return 0;
+}
+
+/**
+ * @brief Check if UART is ready to send
+ * @retval 1 if ready, 0 otherwise
+ */
+uint8_t hal_uart_is_tx_ready(void) {
+    return (HAL_UART_GetState(&huart1) == HAL_UART_STATE_READY) ? 1 : 0;
+}
+
+/**
+ * @brief Check if UART has data to receive
+ * @retval 1 if data available, 0 otherwise
+ */
+uint8_t hal_uart_is_rx_ready(void) {
+    return (HAL_UART_GetState(&huart1) == HAL_UART_STATE_READY) ? 1 : 0;
+}