strange interrupt's behaviour

[karoui]

Posted on May 01, 2013 at 12:37

hi,

i want to generate an interrupt when i get a specified value from MEMS acceleromter :when I reach this value sound starts and when I'm below it the sound stops but the interruption behaves contrary to what I want:When i am  above the specified value the sound stops and it's playing if i'm below it!!!!this is my code int main(void){  uint8_t ctrl = 0;   //etat = 0;  LIS302DL_InitTypeDef  LIS302DL_InitStruct;  //LIS302DL_InterruptConfigTypeDef LIS302DL_InterruptStruct;      /* SysTick end of count event each 10ms */  SysTick_Config(SystemCoreClock/ 100);    /* Set configuration of LIS302DL*/  LIS302DL_InitStruct.Power_Mode = LIS302DL_LOWPOWERMODE_ACTIVE;  LIS302DL_InitStruct.Output_DataRate = LIS302DL_DATARATE_100;  LIS302DL_InitStruct.Axes_Enable = LIS302DL_X_ENABLE | LIS302DL_Y_ENABLE | LIS302DL_Z_ENABLE;  LIS302DL_InitStruct.Full_Scale = LIS302DL_FULLSCALE_2_3;  LIS302DL_InitStruct.Self_Test = LIS302DL_SELFTEST_NORMAL;  LIS302DL_Init(&LIS302DL_InitStruct);      /* Set configuration of Internal High Pass Filter of LIS302DL*/ /* LIS302DL_InterruptStruct.Latch_Request = LIS302DL_INTERRUPTREQUEST_LATCHED;  LIS302DL_InterruptStruct.SingleClick_Axes = LIS302DL_CLICKINTERRUPT_Z_ENABLE;  LIS302DL_InterruptStruct.DoubleClick_Axes = LIS302DL_DOUBLECLICKINTERRUPT_Z_ENABLE;  LIS302DL_InterruptConfig(&LIS302DL_InterruptStruct);*/  /* Required delay for the MEMS Accelerometre: Turn-on time = 3/Output data Rate                                                              = 3/100 = 30ms */  Delay(30);    /* Configure Interrupt control register: enable Click interrupt1 */  ctrl = 0x07;  LIS302DL_Write(&ctrl, LIS302DL_CTRL_REG3_ADDR, 1);    /* Enable Interrupt generation on click/double click on Z axis */  ctrl = 0x70;  LIS302DL_Write(&ctrl, LIS302DL_CLICK_CFG_REG_ADDR, 1);    /* Configure Click Threshold on X/Y axis (10 x 0.5g) */  ctrl = 0xAA;  LIS302DL_Write(&ctrl, LIS302DL_CLICK_THSY_X_REG_ADDR, 1);    /* Configure Click Threshold on Z axis (10 x 0.5g) */  ctrl = 0x0A;  LIS302DL_Write(&ctrl, LIS302DL_CLICK_THSZ_REG_ADDR, 1);    /* Configure Time Limit */  ctrl = 0x03;  LIS302DL_Write(&ctrl, LIS302DL_CLICK_TIMELIMIT_REG_ADDR, 1);      /* Configure Latency */  ctrl = 0x7F;  LIS302DL_Write(&ctrl, LIS302DL_CLICK_LATENCY_REG_ADDR, 1);    /* Configure Click Window */  ctrl = 0x7F;  LIS302DL_Write(&ctrl, LIS302DL_CLICK_WINDOW_REG_ADDR, 1);    /* TIM configuration -------------------------------------------------------*/  TIM_Config();   LIS302DL_Read(Buffer, LIS302DL_OUT_X_ADDR, 6);                    XOffset = Buffer[0];  YOffset = Buffer[2];   EXTILine1_Config();    while(1)  {       if (Buffer[4]>=70)    {  /* Generate software interrupt: simulate a rising edge applied on EXTI0 line */  EXTI_GenerateSWInterrupt(EXTI_Line1);    }     //EVAL_AUDIO_Stop(CODEC_PDWN_HW);  }}void EXTILine1_Config(void){      NVIC_InitTypeDef   NVIC_InitStructure;  /* Enable SYSCFG clock */  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);     /* Connect EXTI Line0 to PA0 pin */  SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource1);  /* Configure EXTI Line0 */  EXTI_InitStructure.EXTI_Line = EXTI_Line1;  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;    EXTI_InitStructure.EXTI_LineCmd = ENABLE;  EXTI_Init(&EXTI_InitStructure);   /* Enable and set EXTI Line0 Interrupt to the lowest priority */  NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn;  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01;  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01;  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;  NVIC_Init(&NVIC_InitStructure);}void EXTI1_IRQHandler(void){  if(EXTI_GetITStatus(EXTI_Line1) != RESET)  {       WavePlayBack(I2S_AudioFreq_48k);    /* Clear the EXTI line 0 pending bit */    EXTI_ClearITPendingBit(EXTI_Line1);  }}void WavePlayBack(uint32_t AudioFreq){&sharpif defined MEDIA_IntFLASH     /* Initialize wave player (Codec, DMA, I2C) */  WavePlayerInit(AudioFreq);    /* Play on */  AudioFlashPlay((uint16_t*)(AUDIO_SAMPLE + AUIDO_START_ADDRESS),AUDIO_FILE_SZE,AUIDO_START_ADDRESS);}Thanks in avance  #volatile-main-loop

[dthedens23]

Posted on May 01, 2013 at 17:16

I would not call the function to play the wave file from the ISR.

have the ISR set a flag variable (remember the keyword volatile)then have the main loop test/clear the flag and call the function.There is no main loop!!!