topic Re: xQueueReceive not receiving the data in MCUXpresso SDK

xQueueReceive not receiving the data

vinothkumars — Tue, 15 Jun 2021 17:40:55 GMT

Hi All,

I am working IMX8QM-MEK with SDK (2.5.1).

xQueueSend is able to send the data and return TRUE. But, xQueueReceive not able receive the data.

Re: xQueueReceive not receiving the data

ErichStyger — Tue, 15 Jun 2021 19:04:21 GMT

it would be really good if you could share a bit more of the details, as there might be many causes for this, including some other task already consuming the data.

Or at least provide an reduced example to look at.

Erich

Re: xQueueReceive not receiving the data

vinothkumars — Fri, 18 Jun 2021 05:48:43 GMT

Thank you @ErichStyger

for the quick reply. Please find the example code here,

vendor/nxp/mcu-sdk-auto/SDK_MEK-MIMX8QM/boards/mekmimx8qm/demo_apps/rear_view_camera/cm4_core1/automotive.c

int do_gear_state(struct cmd_tbl_s *cmd_tbl, int argc, char * const argv[])
{
vehicle_state_t vstate;
uint32_t gear_idx;
char *endptr;
if (argc != 2)
return CMD_RET_USAGE;

gear_idx = strtol(argv[1], &endptr, 0);

vstate.type = STATE_TYPE_GEAR;
vstate.value = gear_idx;

if(xQueueSend(xVStateQueue, (void *)&vstate, (TickType_t)0))
{
PRINTF("Sending gear ++++++++++++++++++ \r\n");
}else{
PRINTF("not able to Send gear ++++++++++++++++++ \r\n");
}

return 0;

}




static void vehicle_state_monitor_task(void *pvParameters)
{
EventBits_t resBits;
vehicle_state_t stateMsg;
uint8_t reqData[SRTM_USER_DATA_LENGTH];
static uint32_t pre_gear_state = AUTO_GEAR_NONE;
TaskHandle_t regHandle;

android_registered_flag = 0;
while (true)
{
PRINTF("+++++++++++++++++ %s ++++++++++++++++++ \r\n", __func__);
if (xQueueReceive(xVStateQueue, &stateMsg, portMAX_DELAY))
{

PRINTF("+++++++++++++++++ %s ++++++++++++++++++ 1\r\n", __func__);

}

}

Re: xQueueReceive not receiving the data

ErichStyger — Fri, 18 Jun 2021 06:28:57 GMT

Hi @vinothkumars ,

that code looks good in general, so I don't see an obvious problem.

What I would suggest:

- check your task stack sizes, if there is enough stack space available. You have

SRTM_USER_DATA_LENGTH

which potentially could be very large

- You need to check you code with the debugger: inspect the queue with the FreeRTOS views (see https://mcuoneclipse.com/2017/03/18/better-freertos-debugging-in-eclipse/)

I hope this helps,

Erich

Re: xQueueReceive not receiving the data

vinothkumars — Fri, 18 Jun 2021 08:57:12 GMT

Thank you @ErichStyger for your reply.

Re: xQueueReceive not receiving the data

vinothkumars — Mon, 21 Jun 2021 18:05:48 GMT

Hi @ErichStyger

It is problem with Camera and display resource. I commented those resource uses and it's working