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Introduce xMessageBufferNextLengthBytes() and tests for the same.

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Add call to traceTASK_SWITCHED_IN() in vTaskStartScheduler() so trace tools can see the first task to run.
This commit is contained in:
Richard Barry
2018-03-04 19:25:14 +00:00
parent 9ed3a9fe18
commit f9bef06ec0
9 changed files with 121 additions and 3 deletions
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42
FreeRTOS/Source/stream_buffer.c
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@ -792,6 +792,48 @@ size_t xReceivedLength = 0, xBytesAvailable, xBytesToStoreMessageLength;
}
/*-----------------------------------------------------------*/
size_t xStreamBufferNextMessageLengthBytes( StreamBufferHandle_t xStreamBuffer )
{
StreamBuffer_t * const pxStreamBuffer = ( StreamBuffer_t * ) xStreamBuffer; /*lint !e9087 !e9079 Safe cast as StreamBufferHandle_t is opaque Streambuffer_t. */
size_t xReturn, xBytesAvailable, xOriginalTail;
configASSERT( pxStreamBuffer );
/* Ensure the stream buffer is being used as a message buffer. */
if( ( pxStreamBuffer->ucFlags & sbFLAGS_IS_MESSAGE_BUFFER ) != ( uint8_t ) 0 )
{
xBytesAvailable = prvBytesInBuffer( pxStreamBuffer );
if( xBytesAvailable > sbBYTES_TO_STORE_MESSAGE_LENGTH )
{
/* The number of bytes available is greater than the number of bytes
required to hold the length of the next message, so another message
is available. Return its length without removing the length bytes
from the buffer. A copy of the tail is stored so the buffer can be
returned to its prior state as the message is not actually being
removed from the buffer. */
xOriginalTail = pxStreamBuffer->xTail;
( void ) prvReadBytesFromBuffer( pxStreamBuffer, ( uint8_t * ) &xReturn, sbBYTES_TO_STORE_MESSAGE_LENGTH, xBytesAvailable );
pxStreamBuffer->xTail = xOriginalTail;
}
else
{
/* The minimum amount of bytes in a message buffer is
( sbBYTES_TO_STORE_MESSAGE_LENGTH + 1 ), so if xBytesAvailable is
less than sbBYTES_TO_STORE_MESSAGE_LENGTH the only other valid
value is 0. */
configASSERT( xBytesAvailable == 0 );
xReturn = 0;
}
}
else
{
xReturn = 0;
}
return xReturn;
}
/*-----------------------------------------------------------*/
size_t xStreamBufferReceiveFromISR( StreamBufferHandle_t xStreamBuffer,
void *pvRxData,
size_t xBufferLengthBytes,