librpip

librpipPwmDutyPercentWrite

uiuint32_t librpipPwmDutyPercentWrite(uint32_t id, float duty_cycle);

Description

Sets the PWM duty cycle as a percentage of the current period. An alternative to using librpipPwmConfigWrite.

Parameters

• uint32_t id
  The PWM device to read. The PWM device needs to have been detected during the librpipInit().
• float duty_cycle
  The duty cycle as a percentage of the period instead of nano seconds. Valid values are anything between 0.0 (fully off)  and 100.0 (fully on).

Returns

0 on failure, 1 on success.

Example

Configure, enable and then alternate between 25% and 75% duty cycles:

uint32_t feature_set, status;
feature_set = librpipInit(LIBRPIP_BOARD_DETECT, LIBRPIP_FLAG_DEBUG_ON, 0);
if(feature_set & LIBRPIP_FEATURE_PWM0) { 
        librpipPwmConfigWrite(0, 10000, 10000, LIBRPIP_PWM_FLAG_POLARITY_NORMAL);
        librpipPwmStatusWrite(0, LIBRPIP_PWM_STATUS_ON);
        while(1) {
                librpipPwmDutyPercentWrite(0, 25.0);
                sleep(5);
                librpipPwmDutyPercentWrite(0, 75.0);
                sleep(5);
        }
}
librpipClose();