static void platform_init_freqsensor(unsigned char pin) {
uint32_t tim;
switch(pin) {
case 1:
/* TIM1 CH1 */
tim = TIM1;
gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO8);
gpio_set_af(GPIOA, GPIO_AF1, GPIO8);
break;
};
timer_reset(tim);
timer_set_mode(tim, TIM_CR1_CKD_CK_INT, TIM_CR1_CMS_EDGE, TIM_CR1_DIR_UP);
timer_set_period(tim, 0xFFFFFFFF);
timer_disable_preload(tim);
timer_continuous_mode(tim);
/* Setup output compare registers */
timer_disable_oc_output(tim, TIM_OC1);
timer_disable_oc_output(tim, TIM_OC2);
timer_disable_oc_output(tim, TIM_OC3);
timer_disable_oc_output(tim, TIM_OC4);
/* Set up compare */
timer_ic_set_input(tim, TIM_IC1, TIM_IC_IN_TI1);
timer_ic_set_filter(tim, TIM_IC1, TIM_IC_CK_INT_N_8);
timer_ic_set_polarity(tim, TIM_IC1, TIM_IC_RISING);
timer_set_prescaler(tim, 2*SENSOR_FREQ_DIVIDER); /* Prescale set to map up to 20kHz */
timer_slave_set_mode(tim, TIM_SMCR_SMS_RM);
timer_slave_set_trigger(tim, TIM_SMCR_TS_IT1FP1);
timer_ic_enable(tim, TIM_IC1);
timer_enable_counter(tim);
timer_enable_irq(tim, TIM_DIER_CC1IE);
switch(pin) {
case 1:
nvic_enable_irq(NVIC_TIM1_CC_IRQ);
nvic_set_priority(NVIC_TIM1_CC_IRQ, 64);
break;
}
}
void pwm_input_init(void)
{
int i;
// initialize the arrays to 0
for (i = 0; i < PWM_INPUT_NB; i++) {
pwm_input_duty_tics[i] = 0;
pwm_input_duty_valid[i] = 0;
pwm_input_period_tics[i] = 0;
pwm_input_period_valid[i] = 0;
}
/** Configure timers
* - timer clock enable
* - base configuration
* - enable counter
*/
#if USE_PWM_INPUT_TIM1
rcc_periph_clock_enable(RCC_TIM1);
pwm_input_set_timer(TIM1, PWM_INPUT_TIM1_TICKS_PER_USEC);
#endif
#if USE_PWM_INPUT_TIM2
rcc_periph_clock_enable(RCC_TIM2);
pwm_input_set_timer(TIM2, PWM_INPUT_TIM2_TICKS_PER_USEC);
#endif
#if USE_PWM_INPUT_TIM3
rcc_periph_clock_enable(RCC_TIM3);
pwm_input_set_timer(TIM3, PWM_INPUT_TIM3_TICKS_PER_USEC);
#endif
#if USE_PWM_INPUT_TIM5
rcc_periph_clock_enable(RCC_TIM5);
pwm_input_set_timer(TIM5, PWM_INPUT_TIM5_TICKS_PER_USEC);
#endif
#if USE_PWM_INPUT_TIM8
rcc_periph_clock_enable(RCC_TIM8);
pwm_input_set_timer(TIM8, PWM_INPUT_TIM8_TICKS_PER_USEC);
#endif
#if USE_PWM_INPUT_TIM9
rcc_periph_clock_enable(RCC_TIM9);
pwm_input_set_timer(TIM9, PWM_INPUT_TIM9_TICKS_PER_USEC);
#endif
#ifdef USE_PWM_INPUT1
/* GPIO configuration as input capture for timer */
gpio_setup_pin_af(PWM_INPUT1_GPIO_PORT, PWM_INPUT1_GPIO_PIN, PWM_INPUT1_GPIO_AF, FALSE);
/** TIM configuration: Input Capture mode
* Two IC signals are mapped to the same TI input
*/
timer_ic_set_input(PWM_INPUT1_TIMER, PWM_INPUT1_CHANNEL_PERIOD, PWM_INPUT1_TIMER_INPUT);
timer_ic_set_input(PWM_INPUT1_TIMER, PWM_INPUT1_CHANNEL_DUTY, PWM_INPUT1_TIMER_INPUT);
#if USE_PWM_INPUT1 == PWM_PULSE_TYPE_ACTIVE_LOW
timer_ic_set_polarity(PWM_INPUT1_TIMER, PWM_INPUT1_CHANNEL_PERIOD, TIM_IC_RISING);
timer_ic_set_polarity(PWM_INPUT1_TIMER, PWM_INPUT1_CHANNEL_DUTY, TIM_IC_FALLING);
#elif USE_PWM_INPUT1 == PWM_PULSE_TYPE_ACTIVE_HIGH
timer_ic_set_polarity(PWM_INPUT1_TIMER, PWM_INPUT1_CHANNEL_PERIOD, TIM_IC_FALLING);
timer_ic_set_polarity(PWM_INPUT1_TIMER, PWM_INPUT1_CHANNEL_DUTY, TIM_IC_RISING);
#endif
/* Select the valid trigger input */
timer_slave_set_trigger(PWM_INPUT1_TIMER, PWM_INPUT1_SLAVE_TRIG);
/* Configure the slave mode controller in reset mode */
timer_slave_set_mode(PWM_INPUT1_TIMER, TIM_SMCR_SMS_RM);
/* Enable timer Interrupt(s). */
nvic_set_priority(PWM_INPUT1_IRQ, PWM_INPUT_IRQ_PRIO);
nvic_enable_irq(PWM_INPUT1_IRQ);
#ifdef PWM_INPUT1_IRQ2
nvic_set_priority(PWM_INPUT1_IRQ2, PWM_INPUT_IRQ_PRIO);
nvic_enable_irq(PWM_INPUT1_IRQ2);
#endif
/* Enable the Capture/Compare and Update interrupt requests. */
timer_enable_irq(PWM_INPUT1_TIMER, (PWM_INPUT1_CC_IE | TIM_DIER_UIE));
/* Enable capture channel. */
timer_ic_enable(PWM_INPUT1_TIMER, PWM_INPUT1_CHANNEL_PERIOD);
timer_ic_enable(PWM_INPUT1_TIMER, PWM_INPUT1_CHANNEL_DUTY);
#endif
#ifdef USE_PWM_INPUT2
/* GPIO configuration as input capture for timer */
gpio_setup_pin_af(PWM_INPUT2_GPIO_PORT, PWM_INPUT2_GPIO_PIN, PWM_INPUT2_GPIO_AF, FALSE);
/** TIM configuration: Input Capture mode
* Two IC signals are mapped to the same TI input
*/
timer_ic_set_input(PWM_INPUT2_TIMER, PWM_INPUT2_CHANNEL_PERIOD, PWM_INPUT2_TIMER_INPUT);
timer_ic_set_input(PWM_INPUT2_TIMER, PWM_INPUT2_CHANNEL_DUTY, PWM_INPUT2_TIMER_INPUT);
#if USE_PWM_INPUT2 == PWM_PULSE_TYPE_ACTIVE_LOW
timer_ic_set_polarity(PWM_INPUT2_TIMER, PWM_INPUT2_CHANNEL_PERIOD, TIM_IC_RISING);
timer_ic_set_polarity(PWM_INPUT2_TIMER, PWM_INPUT2_CHANNEL_DUTY, TIM_IC_FALLING);
#elif USE_PWM_INPUT2 == PWM_PULSE_TYPE_ACTIVE_HIGH
timer_ic_set_polarity(PWM_INPUT2_TIMER, PWM_INPUT2_CHANNEL_PERIOD, TIM_IC_FALLING);
timer_ic_set_polarity(PWM_INPUT2_TIMER, PWM_INPUT2_CHANNEL_DUTY, TIM_IC_RISING);
#endif
/* Select the valid trigger input */
timer_slave_set_trigger(PWM_INPUT2_TIMER, PWM_INPUT2_SLAVE_TRIG);
/* Configure the slave mode controller in reset mode */
timer_slave_set_mode(PWM_INPUT2_TIMER, TIM_SMCR_SMS_RM);
/* Enable timer Interrupt(s). */
nvic_set_priority(PWM_INPUT2_IRQ, PWM_INPUT_IRQ_PRIO);
nvic_enable_irq(PWM_INPUT2_IRQ);
#ifdef PWM_INPUT2_IRQ2
nvic_set_priority(PWM_INPUT2_IRQ2, PWM_INPUT_IRQ_PRIO);
nvic_enable_irq(PWM_INPUT2_IRQ2);
#endif
/* Enable the Capture/Compare and Update interrupt requests. */
timer_enable_irq(PWM_INPUT2_TIMER, (PWM_INPUT2_CC_IE | TIM_DIER_UIE));
/* Enable capture channel. */
timer_ic_enable(PWM_INPUT2_TIMER, PWM_INPUT2_CHANNEL_PERIOD);
timer_ic_enable(PWM_INPUT2_TIMER, PWM_INPUT2_CHANNEL_DUTY);
#endif
}