STM CircleOS forum / systick & App handler call freq

diabolo38 · 2010-05-26 15:48:17

On the stm32-Primers2 manual
4.2.4 Periodic timer2 interrupt
value of 3 doc say 1.5KHz systick freq i do mesure 66ms period =>15Hz
value of 4 doc say 2KHz systick freq i do mesure 50ms period =>20Hz

ther's basicaly a /100 ratio is this any normal ? does circle only call the handler once every 100 systick ?

ntrf.zns · 2010-05-26 17:46:24

Hm. Lets see...

Here it is (menu.c, line 74):

Code:

s32 Appli_Divider = MENU_DIVIDER;

Which is (menu.c, line 32):

Code:

#define MENU_DIVIDER    100

So i guess you're right

Last edited by ntrf.zns (2010-05-26 17:47:38)

diabolo38 · 2010-05-26 19:11:52

You get it i 've been looking at the systick programming and the scheduler source but things where ok there (despite system freq is set to be 8MHz with /8 precaler it get rigts for 64MHz CLK cpu freq)

So the manual is confusing and wrong :

STM32-Primer2 User Manual- 4.2.3 Application scheduler :
Once an application is run (usually through a menu selection), CircleOS will first call an initialization
routine for the application, then will repeatedly call the application handler$1

i'll have to fix this 20Hz is definitively to slow for my application handler need at least 50Hz thanks for getting me the file and line

ntrf.zns · 2010-05-26 19:38:25

You can register your own systick-level handler and register it with UTIL_SetSchHandler. Thats if you do care about compatibility.

diabolo38 · 2010-05-26 20:58:32

Oh yes it will be a better way, it leave menu stuff runnng at a lower rate,
but as i did already changed os for lcd w/o fsmc (i2c on ext con) , fs for create dir , about to disable audio record/playback (spi on ext-connector) keep dma to over stuff mems will be not used and likely shutdown as well ... So i definitively don't care much about full compatibility.

Last edited by diabolo38 (2010-05-26 21:01:02)

# 1 2010-05-26 15:48:17 systick & App handler call freq

systick & App handler call freq

# 2 2010-05-26 17:46:24 systick & App handler call freq

Re: systick & App handler call freq

Code:

Code:

# 3 2010-05-26 19:11:52 systick & App handler call freq

Re: systick & App handler call freq

STM32-Primer2 User Manual- 4.2.3 Application scheduler :

# 4 2010-05-26 19:38:25 systick & App handler call freq

Re: systick & App handler call freq

# 5 2010-05-26 20:58:32 systick & App handler call freq

Re: systick & App handler call freq

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