STM32—USART
阿新 • • 發佈:2019-02-09
前言:
最近在除錯STM32L152晶片的USART配置程式,實現STM32串列埠列印功能,本文總結下STM32L152晶片USART的使用方法。
硬體平臺:STM32L152
軟體平臺:keil v5+cubeMX
函式庫:HAL庫
1:usart初始化
UART_HandleTypeDef huart3; uint8_t rxbuf; void MX_USART3_UART_Init(void) { huart3.Instance = USART3; huart3.Init.BaudRate = 115200; huart3.Init.WordLength = UART_WORDLENGTH_8B; huart3.Init.StopBits = UART_STOPBITS_1; huart3.Init.Parity = UART_PARITY_NONE; huart3.Init.Mode = UART_MODE_TX_RX; huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE; huart3.Init.OverSampling = UART_OVERSAMPLING_16; HAL_UART_Init(&huart3); }
//串列埠gpio初始化
void HAL_UART_MspInit(UART_HandleTypeDef* huart) { GPIO_InitTypeDef GPIO_InitStruct; if(huart->Instance==USART3) { /* Peripheral clock enable */ __HAL_RCC_USART3_CLK_ENABLE(); /**USART3 GPIO Configuration PB10 ------> USART3_TX PB11 ------> USART3_RX */ GPIO_InitStruct.Pin = GPIO_PIN_10|GPIO_PIN_11; GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Pull = GPIO_PULLUP; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH; GPIO_InitStruct.Alternate = GPIO_AF7_USART3;; HAL_GPIO_Init(GPIOB, &GPIO_InitStruct); /* Peripheral interrupt init */ HAL_NVIC_SetPriority(USART3_IRQn, 0, 0); HAL_NVIC_EnableIRQ(USART3_IRQn); } }
//串列埠反初始化
void HAL_UART_MspDeInit(UART_HandleTypeDef* huart) { if(huart->Instance==USART3) { /* Peripheral clock disable */ __HAL_RCC_USART3_CLK_DISABLE(); HAL_GPIO_DeInit(GPIOB, GPIO_PIN_10|GPIO_PIN_11); /* Peripheral interrupt DeInit*/ HAL_NVIC_DisableIRQ(USART3_IRQn); } }
//串列埠中斷回撥函式(響應事件)
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
if(huart->Instance==USART3)
{
//加入處理事件
//如:printf("\GET data!\n");
HAL_UART_Receive_IT(&huart3,&rxbuf,1);//重新使能串列埠中斷
}
}
在STM32L1XX_it.c中加入中斷函式
void USART3_IRQHandler(void)
{
HAL_UART_IRQHandler(&huart3);
}
主函式示例程式碼:
int main(void)
{
HAL_Init( );
SystemClock_Config( );
MX_GPIO_Init( );
MX_USART3_UART_Init();
HAL_UART_Receive_IT(&huart3,&rxbuf,1);//使能串列埠中斷,有串列埠中斷便進入中斷回撥函式
while(1)
{
}
}