LED "get_duty" not retrieving correct data

[BrookR]

Hi All,

I'm trying to get my secondary PWMs dutycycle out through the "LEDC_get_duty" command where my ledc_channel array is ledc_channel[2] making primary PWM in pos. 1 and secondary in pos. 2.

Primary register is 11bit and the secondary being 15bit as they are used for different frequencies.

What I see in the serial print in the while loop is the read out of the primary of any number from 0 to 2048; even when the starting value shouldn't be 0.

I've put the code part where the LEDC commands.

Code: Select all

int PWM_primary = map_primary(65);
ledc_set_duty(ledc_channel[0].speed_mode, ledc_channel[0].channel, PWM_primary);
ledc_update_duty(ledc_channel[0].speed_mode, ledc_channel[0].channel);
vTaskDelay(50/portTICK_PERIOD_MS);

//Secondary pwm signal
PWM_Secondary_Time = ((65.0 - (float)Duty_cycle_prev)/abs((float)Duty_cycle_prev - (float)Duty_cycle)) * Total_Time;
    int PWM_Secondary = map_secondary(65);
ledc_set_fade_with_time(LEDC_HIGH_SPEED_MODE,
    LEDC_CHANNEL_1, PWM_Secondary, PWM_Secondary_Time);
ledc_fade_start(LEDC_HIGH_SPEED_MODE,
    LEDC_CHANNEL_1, LEDC_FADE_NO_WAIT);

vTaskDelay(PWM_Secondary_Time/portTICK_PERIOD_MS);
while(secondary_Pres_Dc != 160){
    secondary_Pres_Dc =  ledc_get_duty(ledc_channel[1].speed_mode,ledc_channel[1].channel);
    printf("%lu\n",secondary_Pres_Dc);
    vTaskDelay(100/portTICK_PERIOD_MS); //100ms
}

//PWM_primary
PWM_primary = map_primary(Duty_cycle);
PWM_primary_Time = (((float)Duty_cycle - 65.0)/abs((float)Duty_cycle_prev - (float)Duty_cycle)) * Total_Time;
ledc_set_fade_with_time(LEDC_HIGH_SPEED_MODE,
    LEDC_CHANNEL_0, PWM_primary, PWM_primary_Time);
ledc_fade_start(LEDC_HIGH_SPEED_MODE,
    LEDC_CHANNEL_0, LEDC_FADE_NO_WAIT);

any help here would be greatly apreciated!

[BrookR]

Update - SOLVED:
I've since resolved this issue by altering the position of where the channels are initalised; By initialising them outside of the setup function and along with the global variables, the LEDC_get_duty function can correctly see the GPIO that the channel is associated with.