pwmusic.c

来自「周立功magic2200实验箱linux增补例子。包括（GPIO zlg7290」· C语言 代码 · 共 73 行

#include "config.h"
#include "music.h"

/* žèÇúÇúÆ× £­ ºç²ÊÃÃÃÃ*/
const uint32 HCMM[] =
{
	_LA, _SO, _MI, _LA, _SO, _MI,
	_LA, _LA, _SO, _LA,
	_LA, _SO, _MI, _LA, _SO, _MI,
	_RE, _RE, _DO, _RE,
	_MI, _MI, _SO, _LA, _DO1, _LA, _SO,
	_MI, _MI, _SO, _DO,
	_MI, _MI, _MI, _MI, _MI,
	_1LA,_1LA,_1SO,_1LA,
};

/* žèÇúœÚÅÄ */
const uint32 HCMM_L[] =
{
	_4, _8, _8, _4, _8, _8,
	_8, _4, _8, _2,
	_4, _8, _8, _4, _8, _8,
	_8, _4, _8, _2,
	_4, _8, _8, _8, _8, _8, _8,
	_8, _4, _8, _2,
	_4, _4, _4, _8, _8,
	_8, _4, _8, _2,
};


/*
********************************************************************************************************
** º¯ÊýÃû³Æ: Delay
** ¹ŠÄÜÃèÊö: ÈíŒþÑÓʱº¯Êý
*******************************************************************************************************
*/
void Delay(uint8 dly)
{
    uint32 i;
    
    for(; dly > 0; dly--)
        for(i = 0; i < 0x7FFF; i++);
}

int main()
{
    int fd;
    uint32 i;
    
    fd = open("/dev/PWM", O_RDONLY);
    if(fd == -1)
    {
        printf("\nCan't open PWM!\n");
        return -1;
    }

    printf("Test PWM2(P0.7) output.\n");

    for(i=0; i<40; i++)
    {
        ioctl(fd, PWM_SET_CYC, Fpclk / HCMM[i]);
        ioctl(fd, PWM_2_SET_DUTY, Fpclk / HCMM[i]/2);
        ioctl(fd, PWM_2_ENABLE);
        Delay(HCMM_L[i]);
    }
     close(fd);
    
    return 0;
}