I've been learning to use the PWM.
This should set the PWM up for a period of around 250ms
NRF_LOG_INFO("Demo 1");
nrf_drv_pwm_config_t const config0 =
{
.output_pins =
{
NRF_DRV_PWM_PIN_NOT_USED, // channel 0
NRF_DRV_PWM_PIN_NOT_USED, // channel 1
NRF_DRV_PWM_PIN_NOT_USED, // channel 2
NRF_DRV_PWM_PIN_NOT_USED // channel 3
},
.irq_priority = APP_IRQ_PRIORITY_LOWEST,
//.base_clock = PWM_PRESCALER_PRESCALER_DIV_1, //16MHz
.base_clock = PWM_PRESCALER_PRESCALER_DIV_128, // 125kHz
.count_mode = NRF_PWM_MODE_UP,
.top_value = 32767, // period
.load_mode = NRF_PWM_LOAD_COMMON,
.step_mode = NRF_PWM_STEP_TRIGGERED
};
APP_ERROR_CHECK(nrf_drv_pwm_init(&m_pwm0, &config0, demo1_handler));
m_used |= USED_PWM(0);
m_demo1_seq_values.channel_0 = 1000; // alternates between these
m_demo1_seq.length = 1; // numb of alternates
nrfx_gpiote_out_set(23);
(void)nrf_drv_pwm_simple_playback(&m_pwm0, &m_demo1_seq, 1,
NRF_DRV_PWM_FLAG_STOP);
After the period is over I expect to clear pin 23.
static void demo1_handler(nrf_drv_pwm_evt_type_t event_type)
{
if (event_type == NRF_DRV_PWM_EVT_FINISHED)
{
nrfx_gpiote_out_clear(23);
restart = true;
return;
I find that its cleared immediately i.e. the PWM period thinks its finished straight away.
The reason I'm asking is I would like to use the ISR to restart the PWM period - like a single shot mode.
kind regards
Liam
