how to convert pwm_change_duty() function used in pic uC to a pwm code

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preethi
preethi 2014-7-3
评论： Uladzimir 2014-7-3
pwm_change_duty() is an already built in function used in pic microcontroller to change duty cycle. how do i convert it into a matlab formula.

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Uladzimir
Uladzimir 2014-7-3
编辑：Uladzimir 2014-7-3
function output = pwmoutput(tctnr,q,Tcntr)
% q - pwm duty assignment 0...1
% Tcntr - pwm counter period
% tau - pwm duty
% tcntr - current pwm counter condition 0...Tcntr
tau = q*Tcntr;
output = tcntr <= tau;
  2 个评论
Uladzimir
Uladzimir 2014-7-3
Pwm timer counts from 0 to timer period. And moment of pwm pin switching is defined by the function pwm_change_duty(). tcntr - is the current value of timer counter. It increments from 0 to Tcntr. Tcntr is maximal quantity of pwm timer clocks. q is the duty factor, which defines the duration of impulse. So output goes high when tcntr is equal tau = q*Tcntr, e. g. tau is the moment of switching.

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