Can't configure Timer2 configuration registers

thibaut2 · ‎2012-08-13

Posted on August 13, 2012 at 16:15

Hi.

I'm trying to use Input Capture mode on Timer2 (channel 3) on an STM8S105 (discovery board). It won't work, and when i m watching peripheral registers with appropriated breakpoints, the registers aren't changing from default value.

I m using STVD with cosmic compiler. I'm using firmware libraries. (i already checked out, that every macros was pointing to the right register.)

Here's everything relevant in my code :

CLK_PeripheralClockConfig(CLK_PERIPHERAL_TIMER2, ENABLE);

GPIO_Init(GPIOD, GPIO_PIN_2, GPIO_MODE_IN_PU_NO_IT);

//!\ modify option bytes : select TIMR2-CH3 for AFR1

TM2_DISABLE; //macro resetting CEN bit in TMR2->CR1 register

TIM2_DeInit();

TIM2_TimeBaseInit(TIM2_PRESCALER_1, 0xFEFE); // changed from FFFF to FEFE to see if it applies any change to ARR register, and it does not :\

TIM2_ICInit(TIM2_CHANNEL_3,

TIM2_ICPOLARITY_FALLING,

TIM2_ICSELECTION_DIRECTTI,

TIM2_ICPSC_DIV1,

0);

TIM2_ITConfig(TIM2_IT_CC3, ENABLE);

TIM2_CCxCmd(TIM2_CHANNEL_3, ENABLE);

TM2_ENABLE; //macro setting CEN bit in TMR2->CR1 register

Has anyone a clue on chat i forgot to enable so this peripheral might work ?

thibaut2 · ‎2012-08-14

Posted on August 14, 2012 at 14:58

here a more precise example :

TIM2->CR1 |= (uint8_t)TIM2_CR1_CEN;

after this instruction i shall see register of TIM2-CR1 (address 0x5300) change from 0x00 to 0x01.

But it won't work... and i already checked base_address, macros, ref manual, and peripheral registers, they re all pointing to the same address 0x5300.

My clock is also enable. I'm using HSI as main clock.

thibaut2 · ‎2012-08-14

Posted on August 14, 2012 at 15:39

I finally found it, my mistake :\

i was enabling/disabling every peripheral clock, but i had kept timer5 and 6 whereas they re not on STM8S105, and timer5 and 2 share same adress. So disabling timer5 was disabling my clock....

Dumb mistake ...