spk.c

from [e-mail] 电路原理图和详细说明： amd.9966.org或者 arm.9966.org 都是原创,包括boot, loader,u-boot,linu

/*-------------------------------------------------------------------------------------
date:20070625
author: wkj
ver 1.0
contrl SPK GPIO example ,Application direct control HardWare
input:XXXXXX
output:return 0
---------------------------------------------------------------------------------------*/
#include <sys/types.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#include <time.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/file.h>
#include "gpio.h"
#include "main.h"
#include "io.h"
#include <stdarg.h>
#include <memory.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <signal.h>
#define DEVICE_FILE_NAME "scan_keyb"


void    *map_base;      //phy 0xffff f000 virtual address

#define DEBUGMSG(x, y, args...) printf(y, ##args)


//#define DEBUGMSG(x, y, args...)
FILE *f;
int n,fd;

int main(int argc, char *argv[])
{
char num,status=0;
int i,j,count;
int ch;       
 
printf("start\n");
if((fd = open("/dev/mem", O_RDWR | O_SYNC)) == -1){
     DEBUGMSG(DEBUG_ERR, "gpio: Error opening /dev/mem\n");
     exit(-1);
		}
        //map 0xffff
map_base      = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, AT91_SYS);//AT91_SYS = 0xffff f000
    
*((volatile unsigned int*)(map_base + ((PIOB_OFFSET + AT91_PIO_PER )))) = 0x1<<28; //PB28  gpio as SPEAKER
*((volatile unsigned int*)(map_base + ((PIOB_OFFSET + AT91_PIO_OER )))) = 0x1<<28;

for(j=0;j<1000;j++)
  { 
	*((volatile unsigned long*)(map_base + ((PIOB_OFFSET + AT91_PIO_CODR))))
			=  0x1 <<28; 
        printf("%d\n",j);
	usleep(500000);
	*((volatile unsigned long*)(map_base + ((PIOB_OFFSET + AT91_PIO_SODR))))
			=  0x1 <<28; 
	usleep(500000);
  }
close(fd);
return 0;
}