Question about lightweight message queue:

dcooper — Wed, 06 Jan 2016 22:53:34 GMT

I am trying to use _lwmsgq_init(location, num_messages, msg_size) to setup a message queue.

In this case I only need the queue to hold one message at a time and the messages may be a 100+ bytes.

I am using the following to setup the queue:

#define UARTQ_NUM_MESSAGES 1

#define UARTQ_MSG_SIZE 50 //In uint32s, allow for 200 byte messages

#define UARTQ_SIZE ((sizeof(LWMSGQ_STRUCT)/sizeof(_mqx_max_type)) + (UARTQ_NUM_MESSAGES * UARTQ_MSG_SIZE))

uint32_t g_uart_tx_msgq[UARTQ_SIZE];

result = _lwmsgq_init((void*)g_uart_tx_msgq, UARTQ_NUM_MESSAGES, UARTQ_MSG_SIZE);

I seem to have some confusion around the msg_size parameter.

If I use the code above code, it does not work. After receiving a message from the queue the code ends up in the __boot_exception() while(1).

If I set UARTQ_MSG_SIZE to some smaller number (<= 25) and simply allocate the message queue as uint32_t g_uart_tx_msgq[1000], the code runs as expected for messages much larger than 8 bytes.

Is there a limit on the message size for lightweight message queues, or does anyone have other insight into what I am seeing.

Thanks

David

Re: Question about lightweight message queue:

soledad — Fri, 22 Jan 2016 20:26:38 GMT

Hello David,

Which MQX version are you using?

Regards

Soledad

Re: Question about lightweight message queue:

dcooper — Mon, 25 Jan 2016 16:28:18 GMT

The Release Notes in the MQX/doc folder indicate 4.1.0.

Thanks

Re: Question about lightweight message queue:

dcooper — Fri, 05 Feb 2016 23:47:53 GMT

Soledad

Can you provide any insight on this issue?

Thanks

David

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