AnsweredAssumed Answered

STM32F4 problem with USART1 INTERRUPT

Question asked by dariogi88 on Feb 19, 2013
Latest reply on Feb 20, 2013 by Clive One
Hi guys,
I have a problem with my new schede STM32F407VG. Until now I have been used the STM32F100B so now I'm adapting the code that I wrote. Part of my code is USART with interrupt, so I have wrote a code that read from USART1 (pin rx P10 and pin tx P9) and when the buffer is full the tx interrupt is ENABLE. I think that the configuration GPIO is wrong because I have modified only this part. If I send a string by Terminal I receive different data for example if I send sasdas  I receive {\xfe}{\xfe}{\xfe}{\xf0}{\xfe}, I checked the baudrate on the Terminal and it is the same of the USART.
I prefix that the code works on the STM32F100B, where the GPIO configuration is:
  
  GPIO_InitTypeDef GPIO_InitStructure;
  /* Configure USART Tx as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;  
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
 
  /* Configure USART Rx as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; // PA.10 USART1.RX
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);


How is the GPIO configuration for the STM32F4?? I'm very confused.

The code write for the STM32F4 is this, where do I err???
/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx.h"
#include "stm324xg_eval.h"


char StringLoop[6];
/**************************************************************************************/
 
void RCC_Configuration(void)
{
  /* Enable GPIO clock */
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
 
  /* Enable UART clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);


}
 /**************************************************************************************/
 
void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
 // Pin 10 Rx
 GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1);
 // Pin 9 Tx
 GPIO_PinAFConfig( GPIOA, GPIO_PinSource9, GPIO_AF_USART1);


  /* Configure USART Tx as alternate function  */
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  //GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;                         // Is it right??
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);


  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//// Is it right??  Should it be IN FLOATING????
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_Init(GPIOA, &GPIO_InitStructure);  
}
 
/**************************************************************************************/
 
void USART_Configuration(void)
{
  USART_InitTypeDef USART_InitStructure;
  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_Rx | USART_Mode_Tx;
 
  /* USART configuration */
  USART_Init(USART1, &USART_InitStructure);
  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);


  /* Enable the USART1 */
  USART_Cmd(USART1, ENABLE);
    
}
 
/**************************************************************************************/
 
void NVIC_Configuration(void)
{  NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);   
  NVIC_InitTypeDef NVIC_InitStructure; 
// Configure the NVIC Preemption Priority Bits
 NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
  /* Enable the USART1 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);


}
 
/**************************************************************************************/
int main(void)
{
  RCC_Configuration();
 
  GPIO_Configuration();
 
  NVIC_Configuration();
 
  USART_Configuration();
  while(1){
  }
  
}


/**************************************************************************************/
void USART1_IRQHandler(void)
{
  static int tx_index = 0;
  static int rx_index = 0;
  // Interrupt rx
 if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) 
  {
    StringLoop[rx_index++] = USART_ReceiveData(USART1);
    if (rx_index >= (sizeof(StringLoop) - 1))
    { rx_index = 0;
      USART_ITConfig(USART1, USART_IT_TXE, ENABLE);
    }
  }
 // Interrupt tx
  if (USART_GetITStatus(USART1, USART_IT_TXE) != RESET) 
  {
    USART_SendData(USART1, StringLoop[tx_index++]);
 
    if (tx_index >= (sizeof(StringLoop) - 1))
    {tx_index = 0;
          USART_ITConfig(USART1, USART_IT_TXE, DISABLE);
}
  }
}
 




 




 /**************************************************************************************/
#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


THANK!!

Outcomes