[原创] STM32 L4串口返回电脑发送的数据

xutong 2017-11-2 18:33 楼主

#include "stm32l4xx_hal.h"
#include "periph.h"
UART_HandleTypeDef UartHandle;
uint8_t aRxBuffer;
int main()
{
char ch[]="hello word";
HAL_Init();
SystemClock_Config();
Gpio_Inits();
__HAL_RCC_USART2_CLK_ENABLE();
UartHandle.Instance = USART2;
UartHandle.Init.BaudRate = 9600;
UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
UartHandle.Init.StopBits = UART_STOPBITS_1;
UartHandle.Init.Parity = UART_PARITY_NONE;
UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
UartHandle.Init.Mode = UART_MODE_TX_RX;
HAL_UART_Init(&UartHandle);
HAL_NVIC_SetPriority(USART2_IRQn, 1, 0);
HAL_NVIC_EnableIRQ(USART2_IRQn); //¿aÆô′®¿úÖD¶Ï2
HAL_UART_Receive_IT(&UartHandle,&aRxBuffer,1);
HAL_UART_Transmit(&UartHandle, (uint8_t *)&ch, 10, 0xFFFF);
while(1)
{
HAL_GPIO_TogglePin(GPIOA,GPIO_PIN_5);
HAL_Delay(500);
}
}
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *husartx)
{
HAL_UART_Transmit(&UartHandle,&aRxBuffer,1,0); //·￠ËíArxBuffer
HAL_UART_Receive_IT(&UartHandle,&aRxBuffer,1); //ÖØDÂ¿aÆô½óêÕÖD¶Ï
}
void USART2_IRQHandler(void)
{
HAL_UART_IRQHandler(&UartHandle);
}

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沙发 xutong

#include "periph.h"
void Gpio_Inits(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_GPIOC_CLK_ENABLE();
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Pin = GPIO_PIN_5 ;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
GPIO_InitStruct.Mode =GPIO_MODE_IT_RISING; //??????????
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Pin = GPIO_PIN_13;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
//??2??????
GPIO_InitStruct.Mode=GPIO_MODE_AF_PP;
GPIO_InitStruct.Pin=GPIO_PIN_2;
GPIO_InitStruct.Speed=GPIO_SPEED_FAST;
GPIO_InitStruct.Alternate=GPIO_AF7_USART2;
GPIO_InitStruct.Pull=GPIO_PULLUP;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
GPIO_InitStruct.Alternate=GPIO_AF7_USART2;
GPIO_InitStruct.Mode=GPIO_MODE_AF_OD;
GPIO_InitStruct.Pin=GPIO_PIN_3;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
//??2??????
/* Enable and set EXTI lines 10 to 15 Interrupt to the lowest priority */
HAL_NVIC_SetPriority(EXTI15_10_IRQn, 2, 0); //??????15——10???
HAL_NVIC_EnableIRQ(EXTI15_10_IRQn); //??????
}
void SystemClock_Config(void)
{
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
/* MSI is enabled after System reset, activate PLL with MSI as source */
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
RCC_OscInitStruct.MSIState = RCC_MSI_ON;
RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_6;
RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_MSI;
RCC_OscInitStruct.PLL.PLLM = 1;
RCC_OscInitStruct.PLL.PLLN = 40;
RCC_OscInitStruct.PLL.PLLR = 2;
RCC_OscInitStruct.PLL.PLLP = 7;
RCC_OscInitStruct.PLL.PLLQ = 4;
if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
/* Initialization Error */
while(1);
}
/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
clocks dividers */
RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK)
{
/* Initialization Error */
while(1);
}
}