Hello,
I have an issue that I can't seem to sort out involving the PWM module. I am currently using SDK9.0 and SoftDevice S110 V8.0 and I am using the stock PWM files from the SDK. The problem I am having is that I can't seem to disable and then re-enable the PWM module. I want to turn the PWM module off when I don't need it to save on battery life and power consumption. I am using a total of three PWM channels on 2 instances that I Init in the following way:
APP_PWM_INSTANCE(PWM1,1);
APP_PWM_INSTANCE(PWM2,2);
bool pwm_1_ready_flag;
bool pwm_2_ready_flag;
void pwm_1_ready_callback(uint32_t pwm_id)
{
pwm_1_ready_flag = true;
}
void pwm_2_ready_callback(uint32_t pwm_id)
{
pwm_2_ready_flag = true;
}
void pwm_init(void)
{
ret_code_t err_code;
/* 2-channel PWM, output on LED pins. */
app_pwm_config_t pwm1_cfg = APP_PWM_DEFAULT_CONFIG_2CH(10000L, LED_RED, LED_GREEN);
app_pwm_config_t pwm2_cfg = APP_PWM_DEFAULT_CONFIG_1CH(10000L, LED_BLUE);
/* Set the polarity of the channel. */
pwm1_cfg.pin_polarity[0] = APP_PWM_POLARITY_ACTIVE_HIGH;
pwm1_cfg.pin_polarity[1] = APP_PWM_POLARITY_ACTIVE_HIGH;
pwm2_cfg.pin_polarity[0] = APP_PWM_POLARITY_ACTIVE_HIGH;
/* Initialize and enable PWM. */
err_code = app_pwm_init(&PWM1,&pwm1_cfg,pwm_1_ready_callback);
APP_ERROR_CHECK(err_code);
err_code = app_pwm_init(&PWM2,&pwm2_cfg,pwm_1_ready_callback);
APP_ERROR_CHECK(err_code);
}
Then I enable the PWM module using:
void enable_pwm(void)
{
app_pwm_enable(&PWM1);
app_pwm_enable(&PWM2);
}
Next I display some blinking LED patterns using PWM and then I turn off the PWM module with:
void disable_pwm(void)
{
app_pwm_disable(&PWM1);
app_pwm_disable(&PWM2);
}
I then verify that the power consumption is a lot lower. Everything is good up until this point. I then try to turn the PWM module back on using:
enable_pwm()
and then I execute the following:
for(int i =0; i < 100; i=i+5)
{
if(i <= red_led_value)
{
while (app_pwm_channel_duty_set(&PWM1, 0, i) == NRF_ERROR_BUSY);
}
if(i <= green_led_value)
{
while (app_pwm_channel_duty_set(&PWM1, 1, i) == NRF_ERROR_BUSY);
}
if(i <= blue_led_value)
{
while (app_pwm_channel_duty_set(&PWM2, 0, i) == NRF_ERROR_BUSY);
}
nrf_delay_ms(10);
}
This should make the RGB LED that I have on my board glow to a bright white. Instead my RGB turns yellow and gets stuck at:
while (app_pwm_channel_duty_set(&PWM2, 0, i) == NRF_ERROR_BUSY);
Its almost as if the app_pwm_enable(&PWM2) call didn't turn the second channel of my PWM module back on.
Here is the Timers section of the nrf_drv_config.h file for reference:
/* TIMER */
#define TIMER0_ENABLED 0
#if (TIMER0_ENABLED == 1)
#define TIMER0_CONFIG_FREQUENCY NRF_TIMER_FREQ_16MHz
#define TIMER0_CONFIG_MODE TIMER_MODE_MODE_Timer
#define TIMER0_CONFIG_BIT_WIDTH TIMER_BITMODE_BITMODE_32Bit
#define TIMER0_CONFIG_IRQ_PRIORITY APP_IRQ_PRIORITY_LOW
#define TIMER0_INSTANCE_INDEX 0
#endif
#define TIMER1_ENABLED 1
#if (TIMER1_ENABLED == 1)
#define TIMER1_CONFIG_FREQUENCY NRF_TIMER_FREQ_16MHz
#define TIMER1_CONFIG_MODE TIMER_MODE_MODE_Timer
#define TIMER1_CONFIG_BIT_WIDTH TIMER_BITMODE_BITMODE_16Bit
#define TIMER1_CONFIG_IRQ_PRIORITY APP_IRQ_PRIORITY_LOW
#define TIMER1_INSTANCE_INDEX (TIMER0_ENABLED)
#endif
#define TIMER2_ENABLED 1
#if (TIMER2_ENABLED == 1)
#define TIMER2_CONFIG_FREQUENCY NRF_TIMER_FREQ_16MHz
#define TIMER2_CONFIG_MODE TIMER_MODE_MODE_Timer
#define TIMER2_CONFIG_BIT_WIDTH TIMER_BITMODE_BITMODE_16Bit
#define TIMER2_CONFIG_IRQ_PRIORITY APP_IRQ_PRIORITY_LOW
#define TIMER2_INSTANCE_INDEX (TIMER1_ENABLED+TIMER0_ENABLED)
#endif
#define TIMER_COUNT (TIMER0_ENABLED + TIMER1_ENABLED + TIMER2_ENABLED)
Do you have any thoughts or suggestions as to why my PWM module isn't working as expected? Any help or advice you can offer is greatly appreciated. I also need to mention that I am executing all of the LED patterns, PWM Enable, and PWM Disable calls using the scheduler.
Thanks for your help and support!
-Cory
