pwm.c

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#include "pwm.h"
#include <regx51.h>
#include <absacc.h>

sbit drv_pwm_out0 = P0^1;
sbit drv_pwm_out1 = P0^5;

unsigned char drv_pwm_rate0;
unsigned char drv_pwm_rate1;
unsigned char tick;

void drv_pwm_set_rate(unsigned char index, unsigned char rate)
{
	if(index == 0)
		drv_pwm_rate0 = rate;
	else
		drv_pwm_rate1 = rate;
}

void drv_pwm_on_timer(void)
{
	tick+=DRV_PWM_STEP;

	if(tick >= 100)
		tick = 0;

	drv_pwm_out0 = (tick < drv_pwm_rate0);
	drv_pwm_out1 = (tick < drv_pwm_rate1);
}