AN2618 datasheet(21/23 Pages) STMICROELECTRONICS

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AN2618

Code example 7.etpu_pwm.c

21/23

}

if (duty > 0xFFFFFF)

{

errorCode = PARAM_OUT_RANGE;

duty = 0xFFFFFF;

}

// passing function parameter to eTPU function frame

*(pba_32 + ETPU_PWM_PERIOD_OFFSET) = period;

*(pba_32 + ETPU_PWM_DUTY_OFFSET) = duty;

//write hsr

ETPU.CHAN[channel].HSRR.R = ETPU_PWM_UPDATE;

return (errorCode);

}

/********************************************************************************

* FUNCTION

: etpu_pwm_getPulseTime

* PURPOSE:

This function executes on the host CPU.

This function is an application API to read the time stamp of the

begining of the last peroid of the PWM output on the ePTU channel.

********************************************************************************/

int16_t etpu_pwm_getPulseTime(uint8_t channel, uint32_t * startTime)

{

int16_t errorCode = 0;

uint32_t functFrame = ETPU.CHAN[channel].CR.B.CPBA;

uint32_t *pba_32 = &DATA_RAM + (functFrame << 1) + ETPU_PSE_RAM_OFFSET;

// passing function parameter to eTPU function frame

*startTime = *(pba_32 + ETPU_PWM_PULSE_TIME_OFFSET);

return (errorCode);

}

AN2618 Fiches technique(PDF) 21 Page - STMicroelectronics