stm8s003f channel 1 PWM

[sunnoj]

Posted on February 28, 2016 at 07:02

Hi,

please let me know how to use port b as output port in stm8s003f mode.

Thanks

[li07]

Posted on March 05, 2016 at 23:16

I tested my instructions with STM8S103F3P6, but they will probably also work with STM8S003F3P6. (I am using SDCC, but something like this should work in the other compilers.)

First, using something like STVP, change AFR0 to ''Port C5 Alternate Function = TIM2_CH1, Port C6 Alternate Function = TIM1_CH1, Port C7 Alternate Function = TIM1_CH2''. (That is, AFR0=1, so OPT2 = 0x) Next, configure the PWM normally:

#include <stm8/stm8sh>
void
main() {
CLK_CKDIVR = 0x00; 
// Set the frequency to 16 MHz
CLK_PCKENR1 = 0xFF; 
// Enable peripherals
TIM1_ARRH = 1023>>8; 
//ARR = 1023
TIM1_ARRL = 1023&0xff;
TIM1_CCMR1 = 0x68; 
//PWM mode 1, preload on compare 1
TIM1_CCER1 = 0x01; 
//active high, enable TIM1_CH1
TIM1_BKR = 0x80; 
//enable all TIM1 outputs
TIM1_CR1 = 0x81; 
//enable auto reload preload, enable timer
TIM1_CCR1H = 500>>8; 
//duty cycle: TIM1_CCR1/(ARR+1) so it is 500/1024
TIM1_CCR1L = 500&0xff;
while
(1);
}

This puts a 500/1024 duty cycle on PC6. Hope this helps you.