STM8S103F3 tsspop20 Alternate Function Remapping AFR0

dhemaius · ‎2009-09-11

Posted on September 11, 2009 at 10:24

dhemaius · ‎2011-05-17

Posted on May 17, 2011 at 15:04

Hi,

I'm having trouble trying to remap TIM1_CH1 and TIM1_CH2 using AFR0 option bit. In the memory window in debug mode, Option Byte @0x4803 holds de right value, but I can't get the output to change state on the proper pins.

I have TIM1_CH3 and TIM1_CH4 working just fine with the exact same configuration as _CH1 and _CH2. So I know this is not a configuration issue.

Is there any specific algo to follow at power-up to make sure alternate function remapping works or is there any issue with that particular remapping on that device?

Thanks,

Francis Savaria

brazov2 · ‎2011-05-17

Posted on May 17, 2011 at 15:04

Hi,

Did you read value @0x4804? It'd equal to FEh, if not try to write 01h @0x4803 and FEh @0x4804 and then reset the device.

coluber

dhemaius · ‎2011-05-17

Posted on May 17, 2011 at 15:04

Alright, here is some information I forgot to tell:

- I work with Raisonnace Ride7 environment;

- Option bytes OPT2/NOPT2 values were validated through Memory View debug window and through Option debug window;

- Current desired remapping is 0x05/0xFA (AFR0 & AFR2), but TIM1 OC1 and OC2 still won't work, while OC3 and OC4 are alright;

- I tried AFR0 both alone and with AFR2.

I have designed an alternative for what I need to accomplish, but the day I'm going to need those outputs working is not far. Did I hit a bug or am I just clueless? :-]

Merci d'avance,

Francis Savaria

brazov2 · ‎2011-05-17

Posted on May 17, 2011 at 15:04

Hi,

I've tried your configuration, previously setting both AFR0 and AFR2 and I can see correctly toggle TIM1_CH1(PC6) and TIM1_CH2(PC7).

coluber

dhemaius · ‎2011-05-17

Posted on May 17, 2011 at 15:04

So I must be clueless... :-[

[...]

// set alternate function remapping

FLASH_ProgramOptionByte(0x4803, (AFR0|AFR2));

[...]

// init outputs

GPIO_Init(GPIOC, (GPIO_PIN_7 | GPIO_PIN_6 | GPIO_PIN_4 | GPIO_PIN_3), GPIO_MODE_OUT_PP_LOW_SLOW);

[...]

// enable OC outputs

TIM1->CCER1 |= (u8)(TIM1_CCER1_CC2E | TIM1_CCER1_CC1E);

TIM1->CCER2 |= (u8)(TIM1_CCER2_CC4E | TIM1_CCER2_CC3E);

[...]

All values in the control and config registers are what I want them to be (all 4 channels with the same config) and OC1 (TIM1_IER_CC1IE) interrupt is even working! PC7 and PC6 are working fine as GPIOs.

So... what else do you think I should look for?

brazov2 · ‎2011-05-17

Posted on May 17, 2011 at 15:04

Hi,

In my example I set CCMR1,CCMR2,CCMR3,CCMR4 to 60h (PWM mode1), also MOE is set, and no need to initialize PORTC. I hope this can help you.

coluber