kedar1993 wrote on Tuesday, May 07, 2019:
I am trying to use the Zero Copy TX Transfer Mode for Sending Data via UART peripheral but getting an assertion failure at ioutilsGIVE_ZERO_COPY_MUTEX.
In my task, I am calling the the FreeRTOS_write as follows:
const uint8_t text[] = "--------------\r\n";
xReturned = FreeRTOS_ioctl( xUART0Handle, ioctlOBTAIN_WRITE_MUTEX, (void *)(50UL/portTICK_RATE_MS));
if( xReturned == pdTRUE )
{
xReturned = FreeRTOS_write(xUART0Handle, text, 16);
}
Within the FreeRTOS_write function, I am calling the ioutilsINITIATE_ZERO_COPY_TX which initiates the transfer. Once the transfer is complete, the ISR for the peripheral is called where I am calling the
`ioutilsGIVE_ZERO_COPY_MUTEX’.
This is where the assertion fails.
/* Normally a mutex would not be given from an interrupt, especially if
there is a mutex holder, as priority inheritance makes no sense for an
interrupts, only tasks. */
configASSERT(!((pxQueue->uxQueueType == queueQUEUE_IS_MUTEX) && (pxQueue->pxMutexHolder != NULL)));
I am not sure where I am going wrong and would appreciate any help. Thanks!