Function esp_idf_sys::xStreamBufferReceiveFromISR

pub unsafe extern "C" fn xStreamBufferReceiveFromISR(
    xStreamBuffer: StreamBufferHandle_t,
    pvRxData: *mut c_void,
    xBufferLengthBytes: usize,
    pxHigherPriorityTaskWoken: *mut BaseType_t,
) -> usize

An interrupt safe version of the API function that receives bytes from a stream buffer.

Use xStreamBufferReceive() to read bytes from a stream buffer from a task. Use xStreamBufferReceiveFromISR() to read bytes from a stream buffer from an interrupt service routine (ISR).

@param xStreamBuffer The handle of the stream buffer from which a stream is being received.

@param pvRxData A pointer to the buffer into which the received bytes are copied.

@param xBufferLengthBytes The length of the buffer pointed to by the pvRxData parameter. This sets the maximum number of bytes to receive in one call. xStreamBufferReceive will return as many bytes as possible up to a maximum set by xBufferLengthBytes.

@param pxHigherPriorityTaskWoken It is possible that a stream buffer will have a task blocked on it waiting for space to become available. Calling xStreamBufferReceiveFromISR() can make space available, and so cause a task that is waiting for space to leave the Blocked state. If calling xStreamBufferReceiveFromISR() causes a task to leave the Blocked state, and the unblocked task has a priority higher than the currently executing task (the task that was interrupted), then, internally, xStreamBufferReceiveFromISR() will set *pxHigherPriorityTaskWoken to pdTRUE. If xStreamBufferReceiveFromISR() sets this value to pdTRUE, then normally a context switch should be performed before the interrupt is exited. That will ensure the interrupt returns directly to the highest priority Ready state task. *pxHigherPriorityTaskWoken should be set to pdFALSE before it is passed into the function. See the code example below for an example.

@return The number of bytes read from the stream buffer, if any.

Example use: @code{c} // A stream buffer that has already been created. StreamBuffer_t xStreamBuffer;

void vAnInterruptServiceRoutine( void ) { uint8_t ucRxData[ 20 ]; size_t xReceivedBytes; BaseType_t xHigherPriorityTaskWoken = pdFALSE; // Initialised to pdFALSE.

// Receive the next stream from the stream buffer. xReceivedBytes = xStreamBufferReceiveFromISR( xStreamBuffer, ( void * ) ucRxData, sizeof( ucRxData ), &xHigherPriorityTaskWoken );

if( xReceivedBytes > 0 ) { // ucRxData contains xReceivedBytes read from the stream buffer. // Process the stream here…. }

// If xHigherPriorityTaskWoken was set to pdTRUE inside // xStreamBufferReceiveFromISR() then a task that has a priority above the // priority of the currently executing task was unblocked and a context // switch should be performed to ensure the ISR returns to the unblocked // task. In most FreeRTOS ports this is done by simply passing // xHigherPriorityTaskWoken into portYIELD_FROM_ISR(), which will test the // variables value, and perform the context switch if necessary. Check the // documentation for the port in use for port specific instructions. portYIELD_FROM_ISR( xHigherPriorityTaskWoken ); } @endcode \ingroup StreamBufferManagement