Octave: Modulation Sine Wave use PWM generate look up table for MCU DAC.

Input the target sample frequency ,sample bits and sample frequency.Generate the duty of PWM(percentage).
Code:

	clc;
	clear;
	sample_bits = 12;#smaple bits
	fs = 10000; #sample frequency
	f = 60; #target frequency
	amp= 2^(sample_bits-1);
	t = 0:1/fs:1/f;
	x = amp*(1+sin(2*pi*f*t));#avoid negative part
	pwm_duty = x/(amp*2);
	bar (pwm_duty);

view raw PWM_SINE.m hosted with ❤ by GitHub

Avoid the negative part cause normally MCU didn't have negative voltage output ability.







Ref:
    1.http://bugworkshop.blogspot.tw/2011/04/blog-post_12.html