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【STM32H7S78-DK测评】期待的串口打印来了
串口在嵌入式工程师眼中的地位非常高，高到拿到开发板后搭建好开发环境后必先要实现之。作为一名嵌入式工程师的我，我也要在第一时间实现串口打印用来调试程序。
在之前的开发板上，调试器只负责调试而无串口，而现在的STM32H7S78上板载的ST-Link v3自带有虚拟串口功能，我们本次也是使用这个虚拟串口来实现调试信息的输出打印。
可以看到连接到了PD0引脚和PD1引脚。阅读datasheet后，可以看到ST-Link的VCP连接到了STM32H7RS的uart4外设上。于是，我们通过STM32CubeMX来配置并生成外设驱动代码。
/**
* [url=home.php?mod=space&uid=247401]@brief[/url] UART MSP Initialization
* This function configures the hardware resources used in this example
* @param huart: UART handle pointer
* @retval None
*/
void HAL_UART_MspInit(UART_HandleTypeDef* huart)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
if(huart->Instance==UART4)
{
/* USER CODE BEGIN UART4_MspInit 0 */
/* USER CODE END UART4_MspInit 0 */
/** Initializes the peripherals clock
*/
PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART234578;
PeriphClkInit.Usart234578ClockSelection = RCC_USART234578CLKSOURCE_PCLK1;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
{
Error_Handler();
}
/* Peripheral clock enable */
__HAL_RCC_UART4_CLK_ENABLE();
__HAL_RCC_GPIOD_CLK_ENABLE();
/**UART4 GPIO Configuration
PD1 ------> UART4_TX
PD0 ------> UART4_RX
*/
GPIO_InitStruct.Pin = GPIO_PIN_1|GPIO_PIN_0;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
GPIO_InitStruct.Alternate = GPIO_AF8_UART4;
HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
/* USER CODE BEGIN UART4_MspInit 1 */
/* USER CODE END UART4_MspInit 1 */
}
}
/**
* @brief UART MSP De-Initialization
* This function freeze the hardware resources used in this example
* @param huart: UART handle pointer
* @retval None
*/
void HAL_UART_MspDeInit(UART_HandleTypeDef* huart)
{
if(huart->Instance==UART4)
{
/* USER CODE BEGIN UART4_MspDeInit 0 */
/* USER CODE END UART4_MspDeInit 0 */
/* Peripheral clock disable */
__HAL_RCC_UART4_CLK_DISABLE();
/**UART4 GPIO Configuration
PD1 ------> UART4_TX
PD0 ------> UART4_RX
*/
HAL_GPIO_DeInit(GPIOD, GPIO_PIN_1|GPIO_PIN_0);
/* USER CODE BEGIN UART4_MspDeInit 1 */
/* USER CODE END UART4_MspDeInit 1 */
}
}
int main(void)
{
/* USER CODE BEGIN 1 */
static uint8_t led_state = 0;
MPU_Config();
/* USER CODE END 1 */
/* Enable the CPU Cache */
/* Enable I-Cache---------------------------------------------------------*/
SCB_EnableICache();
/* Enable D-Cache---------------------------------------------------------*/
SCB_EnableDCache();
/* MCU Configuration--------------------------------------------------------*/
/* Update SystemCoreClock variable according to RCC registers values. */
SystemCoreClockUpdate();
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_UART4_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 */
switch (led_state) {
case 0: {
HAL_GPIO_WritePin(GPIOO, GPIO_PIN_1, GPIO_PIN_RESET);
HAL_GPIO_WritePin(GPIOO, GPIO_PIN_5, GPIO_PIN_RESET);
HAL_GPIO_WritePin(GPIOM, GPIO_PIN_2, GPIO_PIN_SET);
HAL_GPIO_WritePin(GPIOM, GPIO_PIN_3, GPIO_PIN_SET);
led_state = 1;
HAL_UART_Transmit(&huart4, hello_str, sizeof(hello_str) - 1, 1000);
break;
}
case 1: {
HAL_GPIO_WritePin(GPIOO, GPIO_PIN_1, GPIO_PIN_SET);
led_state = 2;
break;
}
case 2: {
HAL_GPIO_WritePin(GPIOO, GPIO_PIN_5, GPIO_PIN_SET);
led_state = 3;
break;
}
case 3: {
HAL_GPIO_WritePin(GPIOM, GPIO_PIN_2, GPIO_PIN_RESET);
led_state = 4;
break;
}
case 4: {
HAL_GPIO_WritePin(GPIOM, GPIO_PIN_3, GPIO_PIN_RESET);
led_state = 0;
break;
}
}
HAL_Delay(200);
}
/* USER CODE END 3 */
}
之后，代码就没有什么难度了！调用一下HAL_Uart_Transmin()即可。效果如下所示：
至此，我们的基础环境实验环节就结束了。接下来，我们也就开始了更高阶的实验了。
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