FreeRTOS clock running too fast?

Kernel
1

Hello guys,
I am working with a (ARTERY) Cortex M4 MCU with a clock set at 288 MHz.
The problem I am having is the FreeRTOS clock is kind of running too fast.
Example: vTaskDelay( 1000 / portTICK_RATE_MS ) delay last milliseconds and not 1 second as it’s supposed to be.
I guess there is something should be set that I am missing; but I’m a newbie and cannot figure it out.
Any help would be greatly appreciated.
Thank you

2

Are you using SysTick or some other timer to drive FreeRTOS tick? Have you defined configCPU_CLOCK_HZ and configTICK_RATE_HZ correctly in your FreeRTOSConfig.h?

3

When I google “artery cortex m4”, I find an MCU that runs at 96 MHz. Aren’t you overclocking the part?

4

No way, it is the AT32F435ZMT7

5

I had this setting in the FreeRTOSConfig.h header:

#if defined(ICCARM) || defined(__CC_ARM) || defined(GNUC)
#include <stdint.h>
extern uint32_t SystemCoreClock;
#endif
.
.
.
#define configCPU_CLOCK_HZ ( SystemCoreClock )
#define configTICK_RATE_HZ ( ( TickType_t ) 1000 )

Now I have, for testing purposes, replaced (SystemCoreClock) with the value of the clock: 288000000 and it started working as expected.

I guess SystemCoreClock was not providing the real clock value.

Thank you

6

This variable is usually updated by the startup code. You can search for the function where it is updated and try to see why it is not called.

7

I’ll do, thank you very much