ev_pwm_wave.c

来自「PWM波形发生程序」· C语言 代码 · 共 55 行

//测试功能：在PWM7~PWM12引脚上输出占空比不同的方波，PWM7、PWM9、PWM11引脚的PWM输出方式设置为低有效，
//          PWM8、PWM10、PWM12引脚的PWM输出方式设置为高有效，采用EVB模块中的通用定时器3产生比较时钟。

#include  "ioreg.h"

void inline disable()
{
     asm(" setc INTM");
}

int initial()
{
     asm(" setc SXM");
     asm(" clrc OVM");
     asm(" clrc CNF");
     SCSR1 = 0x81fe;
     WDCR = 0x0e8;
     
     IMR = 0x0000;
     IFR = 0x0ffff;
     WSGR = 0x00;
}

int pwminitial()
{
    MCRC = MCRC|0x007e;
    ACTRB = 0x0666;
    DBTCONB = 0x00;
    CMPR4 = 0x1000;
    CMPR5 = 0x3000;
    CMPR6 = 0x5000;
    T3PR = 0x6000;
    COMCONB = 0x8200;
    T3CON = 0x1000;
}

void interrupt nothing()
{
	return;
}

main()
{
    disable();
    initial();
    pwminitial();
    T3CON = T3CON|0x0040;
    while(1)
    {
    	;
    }
}