RE: nrf52832 pwm

lkfanyao — Thu, 04 Apr 2019 09:49:11 GMT

Hi Dmitry, thanks for your reply! I have solved this problem by myself!

The correct configure code as follows:

nrf_drv_pwm_config_t const config2 =
{
.output_pins =
{
EMS_BRIDGE_1_PIN, // channel 0
EMS_BRIDGE_2_PIN, // 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 = NRF_PWM_CLK_16MHz,
.count_mode = NRF_PWM_MODE_UP_AND_DOWN,
.top_value = 8,
.load_mode = NRF_PWM_LOAD_INDIVIDUAL,
.step_mode = NRF_PWM_STEP_AUTO
};

APP_ERROR_CHECK(nrf_drv_pwm_init(&m_pwm2, &config2, NULL));

// This array cannot be allocated on stack (hence "static") and it must
// be in RAM (hence no "const", though its content is not changed).
static nrf_pwm_values_individual_t seq_values[] =
{
0x8002, 0x6
};

nrf_pwm_sequence_t const seq =
{
.values.p_individual = seq_values,
.length = NRF_PWM_VALUES_LENGTH(seq_values),
.repeats = 0,
.end_delay = 0
};

(void)nrf_drv_pwm_simple_playback(&m_pwm2, &seq, 1, NRF_DRV_PWM_FLAG_LOOP);

The correct pwm wave as follow chart:

RE: nrf52832 pwm

Dmitry — Thu, 04 Apr 2019 09:33:58 GMT

Try to set up four samples for each sequence, I had issues with short sequences, length=4 is ok.