Instead of asking what's WRONG with my code, can someone please point me to an example, or provide an example, of the correct way to use xQueueSend from a module other than where the queue handle and function handler are defined?

I'm using FreeeRTOS 8.2.0, in IAR EWARM 7.3, on an STM32F4 controller. I am unable to find an example on the entire web that shows this, and it just happens to be giving me a big headache right now.

Thank you...

It shouldn't make any difference which module the queue handle is defined in. A queue handle is just a variable, so it can be declared in one C file, and then extern'ed in another C file, just like any other variable.

File1.c

/* Declared globally. */
QueueHandle_t xQueue = NULL;


int main( void )
{
   . . .

   xQueue = xQueueCreate( 5, sizeof( uint32_t ) );

   . . .

   /* Start tasks. */

   . . .

   /* Start scheduler. */
}

void vTask1InFile1( void *pvParameters )
{
uint32t DataToSend = 0, DataToReceive;
const TickTypet xBlockTime = pdMSTOTICKS( 200 );

for( ;; )
{
    . . .

    xQueueSend( xQueue, &DataToSend, xBlockTime );

    . . .

    xQueueReceive( xQueue, &DataToReceive, xBlockTime );
}


}

File2.c

void vTask2InFile2( void pvParameters )
{
/ Here the queue handle is extern. */
extern QueueHandle_t xQueue;


uint32t DataToSend = 0, DataToReceive;
const TickTypet xBlockTime = pdMSTOTICKS( 200 );

for( ;; )
{
    . . .

    xQueueSend( xQueue, &DataToSend, xBlockTime );

    . . .

    xQueueReceive( xQueue, &DataToReceive, xBlockTime );
}


}

Regards.