Pointer bug when using xQueueReceive() with non zero xTicksToWait

Kernel
1

Hi,

This problem occurs when I using FreeRTOSv10.2.1 & FreeRTOSv10.3.1. My chip is based on CM0 and IDE is IAR7.4. The bug description is below:

The first time of for loop excute well. Since there is no data in the queue, and then cpu yield to other task.

xQueueSend_bug_p1
xQueueSend_bug_p11408×586 50.7 KB

2

When cpu returns to current task, and starts second for loop, the pointer value becomes 0x0, as the picture shows, and it will cause a hardfauld error.

xQueueSend_bug_p2
xQueueSend_bug_p21412×585 53.2 KB

3

If I do changes that shows in the follow picture, then the function works properly.

xQueueSend_bug_p3
xQueueSend_bug_p31415×571 49.6 KB

Actually, xQueueSend(), xSemaphoreTake(), etc have the same problem in my chip.

4

It is very hard to comment on what might be going wrong from just these three images. Are you suggesting there is a bug in the queue code? Or noting there is a bug in your code you would like help debugging?

5

Hi Richard,

Thank you for your reply. This problem doubts me for a long time. I want to know what may be the reason of the problem, or you have any suggestions.