Hello @Bouraoui Chemli ,
my transmission work properly
but my receiving section not working.
can you help me in that
the receiver interrupt routine is wrong or anything else, i cant't understand.
/* Includes ------------------------------------------------------------------*/
#include "stm32l1xx.h"
#include <stdio.h>
#include <string.h>
void uart2_init(void);
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
//unsigned char rx_count = 0;
unsigned char tx_buff;
unsigned char rx_buff;
//char str[20]="abcd";
#ifdef __GNUC__
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif /* __GNUC__ */
int main(void)
{
uart2_init();
USART2->CR1 |= 0X0010;
//while(1)
//{
//USART2->CR1 |= 0X0008; //Set USART2 TX to send data
//USART_SendData(USART2,'Z');
//USART2->CR1 |= 0X0004;
//tx_buff = (unsigned char )USART_ReceiveData(USART2);
USART2->CR1 |= 0X0008;
USART_SendData(USART2,rx_buff);
//}
while(1);
}
void USART2_IRQHandler(void)
{
if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)//enter interrupt when STM32 receice data.
{
USART2->CR1 |= 0X0004;
USART_ClearITPendingBit(USART2, USART_IT_RXNE);
rx_buff = (unsigned char) USART_ReceiveData(USART2); //receive a char
}
}
void uart2_init(void)
{
/* Bit configuration structure for GPIOA PIN5 and PIN6 */
GPIO_InitTypeDef GPIO_InitStructure;
/* USART configuration structure for USART2 */
USART_InitTypeDef USART_InitStructure;
/* Enalbe clock for USART2, AFIO and GPIOD */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOD, ENABLE);
/* GPIOD PIN5 alternative function Tx */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource5, GPIO_AF_USART2);
/* GPIOD PIN6 alternative function Rx */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOD, GPIO_PinSource6, GPIO_AF_USART2);
USART2->DR = 0 ;
fflush(stdin);
fflush(stdout);
/* Baud rate 9600, 8-bit data, One stop bit
No parity, Do both Rx and Tx, No HW flow control*/
USART_InitStructure.USART_BaudRate = 9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
/* Configure USART2 */
USART_Init(USART2, &USART_InitStructure);
/* Enable RXNE interrupt */
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
/* Enable USART2 global interrupt */
NVIC_EnableIRQ(USART2_IRQn);
/* Enable USART2 */
USART_Cmd(USART2, ENABLE);
}
// Keil specific
int fputc(int ch, FILE *f)
{
if (ch == '\n')
{
while (USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET);
USART_SendData(USART2,0x0a); // Line Feed
while (USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET);
USART_SendData(USART2,0x0d); // Carriage Return
return(ch);
}
while (USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET);
USART_SendData(USART2, (uint8_t)ch);
return ch;
}
// Keil specific
int fgetc(FILE *f)
{
unsigned char rxt;
//wait here till rx buffer if full
//RXNE = 0 : Data is not received
//RXNE = 1 : Received data is ready to be read.
while((USART_GetFlagStatus(USART2,USART_FLAG_RXNE))==RESET);
rxt=USART_ReceiveData(USART2);
USART_ClearFlag(USART2, USART_FLAG_RXNE);
return (rxt);
}
// Keil specific
void clrscr(void)
{
fflush(stdin);
fflush(stdout);
while (USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET);
USART_SendData(USART2,0x0c); // form feed
}
#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 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) */
/* Infinite loop */
while (1)
{
}
}
#endif
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
