[BUG] Stream buffer 's configMESSAGE_BUFFER_LENGTH_TYPE is not portable between little / big endian.

[dry-75]

Describe the bug
Stream buffer 's configMESSAGE_BUFFER_LENGTH_TYPE is not portable between little / big endian.

Target

• Development board: TMS570xxxx
• Instruction Set Architecture: ARMv7, BE
• IDE and version: TI ARM CC v20.x.x
• Toolchain and version: TI ARM CC v20.x.x

Host

• Host OS: Linux x86_x64
• Version: Fedora 32

To Reproduce
Configure FreeRTOS.h with #define configMESSAGE_BUFFER_LENGTH_TYPE uint8_t. Send a message with xMessageBufferSend,
to another thread which is waiting for it on xMessageBufferReceive; The receiver will now spin always getting 0 from the receive, as length of message is always 0, yet data is available in buffer..

Expected behavior
It should receive the exact sent message , once.

Additional context

In stream_buffer.c: in the function :
static size_t prvWriteMessageToBuffer( StreamBuffer_t * const pxStreamBuffer,
const void * pvTxData,
size_t xDataLengthBytes,
size_t xSpace,
size_t xRequiredSpace )

....
( void ) prvWriteBytesToBuffer( pxStreamBuffer, ( const uint8_t * ) &( xDataLengthBytes ), sbBYTES_TO_STORE_MESSAGE_LENGTH );
...

This is not portable between little vs big endian With configMESSAGE_BUFFER_LENGTH_TYPE uint8_t it will write wrong byte on big endian.

The messaging works if the type fixed to 32bits/4bytes, on this system

[dry-75]

Needs something like this to fix:

configMESSAGE_BUFFER_LENGTH_TYPE bufflen= xDataLengthBytes;
xShouldWrite = pdTRUE;
( void ) prvWriteBytesToBuffer( pxStreamBuffer, ( const uint8_t * ) &( bufflen ), sbBYTES_TO_STORE_MESSAGE_LENGTH );

[archigup]

Hi, thanks for the bug report! Looking into it