ChibiOS Free Embedded RTOS

What rew said makes sense and is what i am expecting. Using the UART demo in testhal,

Changing to use:


#define STM32_PLLSRC STM32_PLLSRC_HSI
#define STM32_PLLMUL_VALUE 4


Gave me a faster delay than:



#define STM32_PLLSRC STM32_PLLSRC_HSI
#define STM32_PLLMUL_VALUE 9



Can someone explain ...

My HSE is 8Mhz which is the same as the internal RC.

How about question 2 and 3? Why is chThdSleepMilliseconds() affected by clock settings? Should it not be independent of this setting?

Also, a lower STM32_PLLMUL_VALUE give me a slower clock, hence a longer delay instead of something faster ...

I am using the default files from testhal/UART for STM32F103 and having some difficulty understanding how this works. on ChibiOS 3.0.0

1.) The default demo should provide a system clock frequency of 72Mhz right?
2.) Changing STM32_PLLSRC to STM32_PLLSRC_HSI, the delay seems to be doubled


while ...

I cannot find `US2RT()` are you able to point me to the correct file? The compiler throws an error as well when i use it.

Would appreciate if you can point out any incorrect settings for the clock frequency - https://github.com/kennethlimcp/ChibiOS ... /mcuconf.h

Opps my typo. Should be `US2ST()`?

I did this but the logic analyzer shows a waveform of 0.25us delay..

Hey Giovanni,

Do i use US2RT() for chSysPolledDelayX()? If not, what should be the correct way to use chSysPolledDelayX() to create microsecond delays?

Thanks!
ken