Posted on September 12, 2017 at 12:58
Here is my code:
#include <stddef.h>
#include 'stm32f10x.h'
// Set state 'value' of bits of 'ref' by the mask.
template <typename T>
void assign_bit(T& ref, uint32_t mask, bool value){
if(value)
ref|=mask;
else
ref&=~mask;
}
// Set config. of TIM1.
void conf_tim1(bool moe, bool ossi, bool ossr,
bool ois1, bool ois1n,
bool cc1e, bool cc1ne, bool cc1p, bool cc1np,
bool oc1ref){
assign_bit(TIM1->BDTR, TIM_BDTR_OSSI, ossi);
assign_bit(TIM1->BDTR, TIM_BDTR_OSSR, ossr);
assign_bit(TIM1->CR2, TIM_CR2_OIS1, ois1);
assign_bit(TIM1->CR2, TIM_CR2_OIS1N, ois1n);
assign_bit(TIM1->CCER, TIM_CCER_CC1E, cc1e);
assign_bit(TIM1->CCER, TIM_CCER_CC1NE, cc1ne);
assign_bit(TIM1->CCER, TIM_CCER_CC1P, cc1p);
assign_bit(TIM1->CCER, TIM_CCER_CC1NP, cc1np);
// OC1M[2:0]=0x4 or OC1M[2:0]=0x5:
// force inactive level / force active level.
TIM1->CCMR1=((oc1ref)?0x5:0x4)<<4;
assign_bit(TIM1->BDTR, TIM_BDTR_MOE, moe);
}
void conf_tim1(uint32_t pack){
conf_tim1(pack&0x200, pack&0x100, pack&0x80,
pack&0x40, pack&0x20,
pack&0x10, pack&0x8, pack&0x4, pack&0x2,
pack&0x1);
}
int main(){
// Enable the necessary peripheral clock.
RCC->APB2ENR|=
RCC_APB2ENR_IOPAEN|
RCC_APB2ENR_IOPBEN|
RCC_APB2ENR_TIM1EN;
// PA8 (TIM1_CH1), PB13 (TIM1_CH1N):
// CNF.MODE=10=0xA (alt. out, push-pull, 2MHz max)
(GPIOA->CRH&=~0xF)|=0xA;
(GPIOB->CRH&=~(0xF<<(13-8)*4))|=0xA<<(13-8)*4;
// Try out possible combinations of configuration bits.
for(int i=0x000; i<=0x3FF; i++){
// Set configuration.
conf_tim1(i);
//Here we can check state of OC1, OC1N (PA8, PB13).
}
// Infinite loop
int j = 0;
while(true){
j++;
}
}
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