e12 wrote on Thursday, August 04, 2016:
I have question about freertos Fat I’m using iar compiler and stm32f427
scheduling method is preemptive, I‘m using the hal library,
I’m using sdcard (sandisk extreme 16g)
The graph below relates to the execution time of the SDCARD_WRITE_Task ,
X-axis is program execution time,
Y-axis is the time which the SDCARD_WRITE_Task is complete
As shown in graph SDCARD_WRITE_Task is run every 80ms using vTaskDelayUntil,
As shown in graph SDCARD_WRITE_Task is run every 40ms using vTaskDelayUntil
As you can see in the graph, This increased to periodically run time
(incase 80ms is every 18 second, incase 40ms is every 9 second)
**My question this How is this problem occurs when any part of the problem?
This is the problem of the code? Or is it a hardware problem ?**