Posted on May 25, 2018 at 22:45
I use 4 channels;
I don't expect you to use this code, but lift concepts...
I use a foreground process to check all the state machines.
this wait utility, just runs that process while it is waiting.
void init_mS_Wait_Timer(void) {
// load the current timer value, save it to the CC register.
// this will interrupt in 1mS
HAL_TIMEx_OCN_Start(&htim2, TIM_CHANNEL_1); // no interrupt call back is initialised on TOC channel
}
void wait(float Seconds) {
if (Seconds < .001) // 1mSeconds
wait_us((int)(Seconds * 1000000));
else
wait_ms((int)(Seconds * 1000));
}
void wait_us(int uS) {
// tuned to 48MHz processor
// 48MHz tuned ok.
// wait around a bit
int i, j = 0; // rubbish to force compilation
while(--uS > 0) {
for (i = 0; i < 9; i++) ;
if (i > 7) j = 6; // rubbish to force compilation
}
}
void wait_ms(int _mS) {
resetTim2ChannelCounter(&htim2, 1);
do {
waitTim2ChannelComplete(&htim2, 1);
} while (--_mS > 0);
}
void waitTim2ChannelComplete(TIM_HandleTypeDef *htim, uint32_t channel) {
uint32_t tmp;
tmp = 0;
while (!tmp) {
checkBackgroundServices();
switch (channel) {
case 1:
tmp = htim->Instance->SR & TIM_SR_CC1IF;
break;
case 2:
tmp = htim->Instance->SR & TIM_SR_CC2IF;
break;
case 3:
tmp = htim->Instance->SR & TIM_SR_CC3IF;
break;
case 4:
tmp = htim->Instance->SR & TIM_SR_CC4IF;
break;
}
}
switch (channel) {
// used to have &=
case 1 : {
htim->Instance->SR = !TIM_SR_CC1IF; // clear the flag
break;
}
case 2: {
htim->Instance->SR = !TIM_SR_CC2IF; // clear the flag
break;
}
case 3: {
htim->Instance->SR = !TIM_SR_CC3IF; // clear the flag
break;
}
case 4: {
htim->Instance->SR = !TIM_SR_CC4IF; // clear the flag
break;
}
}
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