Hi everyone,
When I run 4 instances (i.e., x2 PWM channels) of PWM with S210 (same example as the ant_background_scanning from SDK 10), after few seconds of constantly changing PWM duty cycle of 2 out of 4 PWM instances, the chip restarts by itself. Issue was not seen with PWM when softdevice and ANT were not enabled. Initialization of the softdevice and ANT is the same as the abovementioned example and the PWM is initialized as shown below:
APP_PWM_INSTANCE(PWM1,1); // Create the instance "PWM1" using TIMER1.
APP_PWM_INSTANCE(PWM2,2); // Create the instance "PWM2" using TIMER2.
void pwm_ready_callback(uint32_t pwm_id)
{
ready_flag = true;
}
...
int main(void) {
...
setup softdevice and ANT here
...
// begin initialization of PWM channels
app_pwm_config_t pwm1_cfg = APP_PWM_DEFAULT_CONFIG_2CH(4096L, 25, 26);
app_pwm_config_t pwm2_cfg = APP_PWM_DEFAULT_CONFIG_2CH(4096L, 28, 29);
//app_pwm_config_t pwm2_cfg = APP_PWM_DEFAULT_CONFIG_2CH(4096L, 26, 28);
// initialize and enable PWM
pwm1_cfg.pin_polarity[0] = APP_PWM_POLARITY_ACTIVE_HIGH;
pwm1_cfg.pin_polarity[1] = APP_PWM_POLARITY_ACTIVE_HIGH;
err_code = app_pwm_init(&PWM1, &pwm1_cfg, pwm_ready_callback);
APP_ERROR_CHECK(err_code);
pwm2_cfg.pin_polarity[0] = APP_PWM_POLARITY_ACTIVE_HIGH;
pwm2_cfg.pin_polarity[1] = APP_PWM_POLARITY_ACTIVE_HIGH;
err_code = app_pwm_init(&PWM2, &pwm2_cfg, pwm_ready_callback);
APP_ERROR_CHECK(err_code);
// enable PWMs
app_pwm_enable(&PWM1);
app_pwm_enable(&PWM2);
...
while(1) {
while (app_pwm_channel_duty_set(&PWM1, 1, 16) == NRF_ERROR_BUSY); // left forward
while (app_pwm_channel_duty_set(&PWM2, 1, 16) == NRF_ERROR_BUSY); // right backward
nrf_delay_ms(1000);
while (app_pwm_channel_duty_set(&PWM1, 1, 0) == NRF_ERROR_BUSY); // left forward
while (app_pwm_channel_duty_set(&PWM2, 1, 0) == NRF_ERROR_BUSY); // right backward
nrf_delay_ms(1000);
}
One observation that I made was that the PWM gets stuck at the first bit of the while loop when both instances are set to '16' percent before restarting. That is, instead of stopping all PWM after 1 second, the PWM continues at 16% duty cycle for several seconds and then restarts.
Thank you for your help.
