STM32 Timer Interrupt unterbricht USART2 beim Senden

[Fun R. (funnyrice)]

Hallo,

ich mache gerade meine ersten (bis hundertsten) Gehversuche mit dem 
STM32F103VET6 im Primer2. Als IDE benutze ich Ride7.

Unter Verwendung der mitgelieferten Beispielprogramme habe ich bis jetzt 
einen String über USART2 gesendet und eine Timebase über Timer2 
Interrupt am laufen. Nun ja, die ersten Schritte halt.

Beim Versuch USART2 und TimerBase zu kombinieren habe ich festgestellt, 
daß die Timerinterrupts TIM_IT_CC2 bis TIM_IT_CC4 den USART2 beim Senden 
stoppen.

Wenn ich also statt

 TIM_ITConfig(TIM2, TIM_IT_CC1 | TIM_IT_CC2 | TIM_IT_CC3 | TIM_IT_CC4, ENABLE);

einfach

 TIM_ITConfig(TIM2, TIM_IT_CC1, ENABLE);

schreibe, dann werden meine 45 Zeichen gesendet.

Ich kann mir nicht erklären warum das so ist.
Hat jemand einen Tipp?

Hab den Code mal angehangen.


Gruß, Fun Rice


 Interrupt Handler

void TIM2_IRQHandler(void)
{
//GPIO_ResetBits(GPIOA, GPIO_Pin_4); // Achtung Test

  if (TIM_GetITStatus(TIM2, TIM_IT_CC1) != RESET)
  {
  
    TIM_ClearITPendingBit(TIM2, TIM_IT_CC1);

    /* Pin PB.06 toggling with frequency = 73.24 Hz */
    GPIO_WriteBit(GPIOB, GPIO_Pin_6, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOB, GPIO_Pin_6)));
    capture = TIM_GetCapture1(TIM2);
    TIM_SetCompare1(TIM2, capture + CCR1_Val);
  }
}

main

/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
* File Name          : main.c
* Author             : MCD Application Team
* Version            : V2.0.3
* Date               : 09/22/2008
* Description        : Main program body
********************************************************************************
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
* CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_lib.h"
#include "stm32f10x_it.h"
/* Private typedef -----------------------------------------------------------*/
typedef enum { FAILED = 0, PASSED = !FAILED} TestStatus;

/* Private define ------------------------------------------------------------*/
//#define OLD_STM32LIB_USED
#define TxBufferSize   (countof(TxBuffer))

/* Private macro -------------------------------------------------------------*/
#define countof(a)   (sizeof(a) / sizeof(*(a)))

/* Private variables ---------------------------------------------------------*/
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;

USART_InitTypeDef USART_InitStructure;
u8 TxBuffer[] = "Buffer Send from USART2 to USART1 using Flags";
u8 RxBuffer[TxBufferSize];
u8 TxCounter = 0, RxCounter = 0;  
TestStatus TransferStatus = FAILED;  
ErrorStatus HSEStartUpStatus;

//vu16 CCR1_Val = 49152;
vu16 CCR1_Val = 480;
vu16 CCR2_Val = 32768;
vu16 CCR3_Val = 16384;
vu16 CCR4_Val = 8192; 

/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);
void USART_Configuration(void);
void TIM2_Configuration(void);
TestStatus Buffercmp(u8* pBuffer1, u8* pBuffer2, u16 BufferLength);
//u8 index = 0;
 

/* Private functions ---------------------------------------------------------*/

/*******************************************************************************
* Function Name  : main
* Description    : Main program
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
int main(void)
{
#ifdef DEBUG
  debug();
#endif

  /* System Clocks Configuration */
  RCC_Configuration();
       
  /* NVIC configuration */
  NVIC_Configuration();

  /* Configure the GPIO ports */
  GPIO_Configuration();

  USART_Configuration();

  TIM2_Configuration();


  while(TxCounter <= 45)
  {   
    /* Send one byte from USART1 to USART2 */
     USART_SendData(USART2, TxBuffer[TxCounter++]);

    
    /* Loop until USART2 DR register is empty */ 
    while(USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET)
    {
    }
     
  } 


  while (1)
  {
  }
}
void TIM2_Configuration(void)
{
/* ---------------------------------------------------------------
    TIM2 Configuration: Output Compare Timing Mode:
    TIM2CLK = 36 MHz, Prescaler = 4, TIM2 counter clock = 7.2 MHz
    CC1 update rate = TIM2 counter clock / CCR1_Val = 146.48 Hz
    CC2 update rate = TIM2 counter clock / CCR2_Val = 219.7 Hz
    CC3 update rate = TIM2 counter clock / CCR3_Val = 439.4 Hz
    CC4 update rate = TIM2 counter clock / CCR4_Val =  878.9 Hz
  --------------------------------------------------------------- */

  /* Time base configuration */
  TIM_TimeBaseStructure.TIM_Period = 65535;
  TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

  /* Prescaler configuration */
  TIM_PrescalerConfig(TIM2, 4, TIM_PSCReloadMode_Immediate);

  /* Output Compare Timing Mode configuration: Channel1 */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Timing;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR1_Val;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; 

  TIM_OC1Init(TIM2, &TIM_OCInitStructure);
  TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Disable);
  
  /* Output Compare Timing Mode configuration: Channel2 */
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR2_Val;

  TIM_OC2Init(TIM2, &TIM_OCInitStructure);

  TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Disable);

  /* Output Compare Timing Mode configuration: Channel3 */
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR3_Val;

  TIM_OC3Init(TIM2, &TIM_OCInitStructure);

  TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Disable);

  /* Output Compare Timing Mode configuration: Channel4 */
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR4_Val;

  TIM_OC4Init(TIM2, &TIM_OCInitStructure);

  TIM_OC4PreloadConfig(TIM2, TIM_OCPreload_Disable);

  /* TIM IT enable */
  TIM_ITConfig(TIM2, TIM_IT_CC1 | TIM_IT_CC2 | TIM_IT_CC3 | TIM_IT_CC4, ENABLE);

  /* TIM2 enable counter */
  TIM_Cmd(TIM2, ENABLE);

}
/*******************************************************************************
* Function Name  : RCC_Configuration
* Description    : Configures the different system clocks.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void RCC_Configuration(void)
{
  /* SYSCLK, HCLK, PCLK2 and PCLK1 configuration -----------------------------*/   
  /* RCC system reset(for debug purpose) */
  RCC_DeInit();

  /* Enable HSE */
  RCC_HSEConfig(RCC_HSE_ON);

  /* Wait till HSE is ready */
  HSEStartUpStatus = RCC_WaitForHSEStartUp();

  if (HSEStartUpStatus == SUCCESS)
  {
    /* Enable Prefetch Buffer */
    FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

    /* Flash 2 wait state */
    FLASH_SetLatency(FLASH_Latency_2);
 
    /* HCLK = SYSCLK */
    RCC_HCLKConfig(RCC_SYSCLK_Div1); 
  
    /* PCLK2 = HCLK */
    RCC_PCLK2Config(RCC_HCLK_Div1); 

    /* PCLK1 = HCLK/2 */
    RCC_PCLK1Config(RCC_HCLK_Div2);

    /* PLLCLK = 12MHz * 6 = 72 MHz */
    RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_6);

    /* Enable PLL */ 
    RCC_PLLCmd(ENABLE);

    /* Wait till PLL is ready */
    while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
    {
    }

    /* Select PLL as system clock source */
    RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

    /* Wait till PLL is used as system clock source */
    while(RCC_GetSYSCLKSource() != 0x08)
    {
    }
  }
  else
  { /* If HSE fails to start-up, the application will have wrong clock configuration.
       User can add here some code to deal with this error */    

    /* Go to infinite loop */
    while (1)
    {
    }



  }

  /* TIM2 clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

  /* GPIOC clock enable */
//  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);    

  /* Enable USART1, GPIOA, GPIOD and AFIO clocks */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 |
                         RCC_APB2Periph_GPIOA |
                         RCC_APB2Periph_GPIOB |
                         RCC_APB2Periph_AFIO, ENABLE);
  /* Enable USART2 clock */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
}

/*******************************************************************************
* Function Name  : GPIO_Configuration
* Description    : Configures the different GPIO ports.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

//#ifdef USE_STM3210B_EVAL
  /* Enable the USART2 Pins Software Remapping */
//  GPIO_PinRemapConfig(GPIO_Remap_USART2, ENABLE);
//#endif

  /* Configure USART1 Tx (PA.09) as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* Configure USART2 Tx as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* Configure USART1 Rx (PA.10) as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
 // PullUp GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* Configure USART2 Rx as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  
  
  /* Configure (PB.06) as output push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOB, &GPIO_InitStructure);  
}

void USART_Configuration(void)
{
/* USART1 and USART2 configuration ------------------------------------------------------*/
  /* USART and USART2 configured as follow:
        - BaudRate = 230400 baud  
        - Word Length = 8 Bits
        - One Stop Bit
        - Even parity
        - Hardware flow control disabled (RTS and CTS signals)
        - Receive and transmit enabled
  */
  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;
  
  /* Configure USART1 */
  USART_Init(USART1, &USART_InitStructure);
  /* Configure USART2 */
  USART_Init(USART2, &USART_InitStructure);
  
  /* Enable the USART1 */
  USART_Cmd(USART1, ENABLE);

  /* Enable the USART2 */
  USART_Cmd(USART2, ENABLE);
  }

/*******************************************************************************
* Function Name  : NVIC_Configuration
* Description    : Configures Vector Table base location.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void NVIC_Configuration(void)
{  
 NVIC_InitTypeDef NVIC_InitStructure;

#ifdef  VECT_TAB_RAM  
  /* Set the Vector Table base location at 0x20000000 */ 
  NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0); 
#else  /* VECT_TAB_FLASH  */
  /* Set the Vector Table base location at 0x08000000 */ 
  NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);   
#endif


  /* Enable the TIM2 gloabal Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQChannel;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

  NVIC_Init(&NVIC_InitStructure); 
}

/*******************************************************************************
* Function Name  : Buffercmp
* Description    : Compares two buffers.
* Input          : - pBuffer1, pBuffer2: buffers to be compared.
*                : - BufferLength: buffer's length
* Output         : None
* Return         : PASSED: pBuffer1 identical to pBuffer2
*                  FAILED: pBuffer1 differs from pBuffer2
*******************************************************************************/
TestStatus Buffercmp(u8* pBuffer1, u8* pBuffer2, u16 BufferLength)
{
  while(BufferLength--)
  {
    if(*pBuffer1 != *pBuffer2)
    {
      return FAILED;
    }
    
    pBuffer1++;
    pBuffer2++;
  }

  return PASSED;  
}

#ifdef  DEBUG
/*******************************************************************************
* Function Name  : assert_failed
* Description    : Reports the name of the source file and the source line number
*                  where the assert_param error has occurred.
* Input          : - file: pointer to the source file name
*                  - line: assert_param error line source number
* Output         : None
* Return         : None
*******************************************************************************/
void assert_failed(u8* file, u32 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 2008 STMicroelectronics *****END OF FILE****/

[Plan (Gast)]

In der Interrupt Routine wird auch nur das Bit
TIM_ClearITPendingBit(TIM2, TIM_IT_CC1);
gelöscht.

Wenn ein anderes Bit den Interrupt auslöst und dieses Bit nicht gelöscht 
wird, so wird automatisch der Interrupt so oft ausgelöst bis das Bit 
gelöscht ist.

Da Du das nicht machst hats Du eine Interrupt-Endlosschleife generiert. 
Mit dem Nebeneffekt dass die Main while Schleife nicht mehr bearbeitet 
wird.

[Fun R. (funnyrice)]

Hallo Plan,

danke für die schnelle Antwort!

Hört sich sehr plausibel an. Hab´s gleich getestet und jetzt 
funktioniert´s.
Vielen Dank nochmal!

Gruß, Fun Rice