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

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preethi 2014-7-3

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https://ww2.mathworks.cn/matlabcentral/answers/140011-how-to-convert-pwm_change_duty-function-used-in-pic-uc-to-a-pwm-code

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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Answer 1

Uladzimir 2014-7-3

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https://ww2.mathworks.cn/matlabcentral/answers/140011-how-to-convert-pwm_change_duty-function-used-in-pic-uc-to-a-pwm-code#answer_143483

编辑：Uladzimir 2014-7-3

在 MATLAB Online 中打开

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;

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preethi 2014-7-3

could you please explain what tcnts,q,Tcntr is

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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