Issue with SPI interrupt

samuelboivineau — Thu, 21 Jan 2016 11:12:06 GMT

Hello,

I am evaluating a K64 platform with the tower, and I am trying to use the SPI with interrupts but I always get some errors caught in the hardfault handler.

When i have crashed, I get :

lr = 0x79f7 =>

326 if (DSPI_DRV_MasterStartTransfer(instance, device) == kStatus_DSPI_Busy)

000079f2: bl 0x7914 <DSPI_DRV_MasterStartTransfer>

000079f6: cmp r0, #4

000079f8: beq.n 0x7a26 <DSPI_DRV_MasterTransferBlocking+90>

334 syncStatus = OSA_SemaWait(&dspiState->irqSync, timeout);

000079fa: add.w r0, r4, #40 ; 0x28

000079fe: ldr r1, [sp, #28]

00007a00: bl 0x82c6 <OSA_SemaWait>

335 }while(syncStatus == kStatus_OSA_Idle);

So I assume the next instruction should be a comparison between the result of DSPI_DRV_MasterStartTransfer and Busy (4) in the function DSPI_DRV_MasterTransferBlocking , but the crash occurs.

I have also pc = 0x1fff3b7c but I can't relate this adress ...

and psr = 0

I have created the IRQ using this declaration :

void MQX_SPI0_IRQHandler(void)

{

DSPI_DRV_IRQHandler(SPI0_IDX);

}

and this code :

{

int i;

dspi_status_t dspiResult;

dspi_master_state_t masterState;

dspi_device_t masterDevice;

dspi_master_user_config_t masterUserConfig = {

.isChipSelectContinuous = false,

.isSckContinuous = false,

.pcsPolarity = kDspiPcs_ActiveLow,

.whichCtar = kDspiCtar0,

.whichPcs = kDspiPcs0

};

uint32_t calculatedBaudRate;

if(!init_ok)

{

// Setup the configuration.

masterDevice.dataBusConfig.bitsPerFrame = 8;

masterDevice.dataBusConfig.clkPhase = kDspiClockPhase_FirstEdge;

masterDevice.dataBusConfig.clkPolarity = kDspiClockPolarity_ActiveHigh;

masterDevice.dataBusConfig.direction = kDspiMsbFirst;

// Initialize master driver.

dspiResult = DSPI_DRV_MasterInit(DSPI_MASTER_INSTANCE,

&masterState,

&masterUserConfig);

if (dspiResult != kStatus_DSPI_Success)

{

PRINT("\r\nERROR: Can not initialize master driver \n\r");

return NONOS_RET_ERR;

}

// Configure baudrate.

masterDevice.bitsPerSec = TRANSFER_BAUDRATE;

dspiResult = DSPI_DRV_MasterConfigureBus(DSPI_MASTER_INSTANCE,

&masterDevice,

&calculatedBaudRate);

if (dspiResult != kStatus_DSPI_Success)

{

PRINT("\r\nERROR: failure in configuration bus\n\r");

return NONOS_RET_ERR;

}

else

{

printf("\r\n Transfer at baudrate %lu \r\n", calculatedBaudRate);

}

if (NULL == OSA_InstallIntHandler(SPI0_IRQn, MQX_SPI0_IRQHandler))

{

PRINT("spi_init:OSA_InstallIntHandler returned 4\n");

return NONOS_RET_ERR;

}

INT_SYS_EnableIRQ(SPI0_IRQn);

NVIC_SetPriority(SPI0_IRQn, 6U);

init_ok = 1;

}

else

{

PRINT("\r\nERROR: init already done\n\r");

return NONOS_RET_ERR;

}

#ifdef SL_PLATFORM_MULTI_THREADED

return OSI_OK;

#else

return NONOS_RET_OK;

#endif

}

The write (that fails and creates the crash) is done this way :

int spi_Write(Fd_t fd, unsigned char *pBuff, int len)

{

dspi_status_t dspiResult;

// Send the data.

dspiResult = DSPI_DRV_MasterTransferBlocking(DSPI_MASTER_INSTANCE,

NULL, // device conf ou NULL si aucun changement

pBuff, // buffer de data a envoyer ou null pour envoyer des 0

NULL, // buffer de data a recevoir ou null si data recue ignoree

len, // quantite de donnee

MASTER_TRANSFER_TIMEOUT); // duree de timeout

if (dspiResult != kStatus_DSPI_Success)

{

//PRINT("spi_Write error\r\n");

return 0;

}

return len;

}

Finally, those functions are called through a task.

I think there is some issue with the IRQ, but I can't get a breakpoint triggered in this IRQ before calling the DSPI driver. If someone has an idea about this ...

Regards

Re: Issue with SPI interrupt

samuelboivineau — Fri, 22 Jan 2016 08:27:14 GMT

After investigation, it appears the issue is related to printf, that overwrites data, especially data pointed by g_dspiStatePtr at 0x1fff89dc. I have set the stack size to 10000 and the heap size to 0x2000. If someone has any idea ...

Re: Issue with SPI interrupt

samuelboivineau — Fri, 22 Jan 2016 10:10:10 GMT

Solved, the data used in the init was local so not kept in memory, which was creating the overwrite.

solution : replace masterState by g_masterState (global)

topic Issue with SPI interrupt in Kinetis Software Development Kit

Issue with SPI interrupt

Re: Issue with SPI interrupt

Re: Issue with SPI interrupt