/**
* @brief Configures and activates the GPT peripheral.
*
* @param[in] gptp pointer to the @p GPTDriver object
*
* @notapi
*/
void gpt_lld_start(GPTDriver *gptp)
{
uint8_t psc;
if (gptp->state == GPT_STOP) {
/* Clock activation.*/
}
/* Configuration.*/
#if AVR_GPT_USE_TIM2 || defined(__DOXYGEN__)
if (gptp == &GPTD2) {
psc = prescaler(gptp->config->frequency, ratio_extended, PRESCALER_SIZE_EXTENDED);
gptp->clock_source = clock_source_extended[psc] & 0x07;
TCCR2A = (1 << WGM21) | (0 << WGM20);
TCCR2B = (0 << WGM22);
OCR2A = F_CPU / ratio_extended[psc] /gptp->config->frequency - 1;
return;
}
#endif
uint8_t i = getTimerIndex(gptp);
psc = prescaler(gptp->config->frequency, ratio_base, PRESCALER_SIZE_BASE);
gptp->clock_source = clock_source_base[psc] & 0x07;
*regs_table[i].tccra = (0 << WGM11) |
(0 << WGM10) |
(0 << COM1A1) |
(0 << COM1A0) |
(0 << COM1B1) |
(0 << COM1B0);
*regs_table[i].tccrb = (1 << WGM12);
*regs_table[i].ocr1 = 0;
*regs_table[i].ocr2 = F_CPU / ratio_base[psc] / gptp->config->frequency - 1;
}
/**
* @brief Configures and activates the GPT peripheral.
*
* @param[in] gptp pointer to the @p GPTDriver object
*
* @notapi
*/
void gpt_lld_start(GPTDriver *gptp) {
NRF_TIMER_Type *tim = gptp->tim;
if (gptp->state == GPT_STOP) {
osalDbgAssert(gptp->cc_int < NRF5_TIMER_COMPARE_NUM,
"invalid capture/compare index");
tim->INTENSET = TIMER_INTENSET_COMPARE0_Msk << gptp->cc_int;
#if NRF5_GPT_USE_TIMER0
if (&GPTD1 == gptp)
nvicEnableVector(TIMER0_IRQn, NRF5_GPT_TIMER0_IRQ_PRIORITY);
#endif
#if NRF5_GPT_USE_TIMER1
if (&GPTD2 == gptp)
nvicEnableVector(TIMER1_IRQn, NRF5_GPT_TIMER1_IRQ_PRIORITY);
#endif
#if NRF5_GPT_USE_TIMER2
if (&GPTD3 == gptp)
nvicEnableVector(TIMER2_IRQn, NRF5_GPT_TIMER2_IRQ_PRIORITY);
#endif
}
/* Prescaler value calculation.*/
tim->PRESCALER = prescaler(gptp->config->frequency);
/* Timer configuration.*/
tim->MODE = TIMER_MODE_MODE_Timer << TIMER_MODE_MODE_Pos;
switch (gptp->config->resolution) {
case 8:
tim->BITMODE = TIMER_BITMODE_BITMODE_08Bit << TIMER_BITMODE_BITMODE_Pos;
break;
case 16:
tim->BITMODE = TIMER_BITMODE_BITMODE_16Bit << TIMER_BITMODE_BITMODE_Pos;
break;
#if NRF5_GPT_USE_TIMER0
case 24:
tim->BITMODE = TIMER_BITMODE_BITMODE_24Bit << TIMER_BITMODE_BITMODE_Pos;
break;
case 32:
tim->BITMODE = TIMER_BITMODE_BITMODE_32Bit << TIMER_BITMODE_BITMODE_Pos;
break;
#endif
default:
osalDbgAssert(FALSE, "invalid timer resolution");
break;
};
}
int Max6651ClosedLoop::prescalerMultiplier() const{
// 0 --> 1
// 1 --> 2
// 2 --> 4
// 3 --> 8
// 4 --> 16
// n --> 2^n
int n = int(prescaler());
//return (n == 0) ? 0 : 1 << n;
return (1 << (n+1)) >> 1;
}
