main.c

fft的工业级的EP9315的开发板的所有驱动程序

/****************************************Copyright (c)**************************************************
**                                     研    发    部
**                              http://www.FFTChina.com
**-----------------------------------------文件信息-----------------------------------------------------
**文   件   名: cantest.c
**创   建   人: 
**最后修改日期: 2005年6月30日
**描        述:  
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
/* to produce a pwm of 100khz(10us)and 20% duty cycle with system clock of 14.7456Mhz
   
   Caculate Pwmtermcnt (14.7456M/0.1M) -1 = 146.456 
   Caculate PwmDutyCycle 0.2*(146.456+1)-1= 28.4912

*/  
#include "stdio.h"
#include "stdlib.h"
#include "sys/types.h"
#include "sys/stat.h"
#include "fcntl.h"
#define PwmStt  1
#define PwmStp  0
int main(void)
{
    int fd1,i;
    unsigned long pwmtc ;
    unsigned long pwmduty;
    unsigned long pwmparmt;
    printf("Begin to test fftpwm1 drivers\n");
    fd1=open("/dev/fftpwm1", O_RDWR);            
    if(fd1==-1) {
       perror("open");
       exit(EXIT_FAILURE);
    }
    for(i = 0;i < 6;i++) {
       switch( i )
       {
          case 0: 
             pwmtc  = 146;                 //set the cycle of 10um, 20% duty cycle 
             pwmduty= 28;                   
             pwmparmt = (pwmtc | (pwmduty <<16));
             break;
          case 1:
             pwmtc  = 1465;                //100um of cycle ,20% duty cycle.
             pwmduty= 285;
             pwmparmt = (pwmtc | (pwmduty <<16));
             break;
          case 2:
             pwmtc  = 14646;               //1ms of cycle.
             pwmduty= 2849;
             pwmparmt = (pwmtc | (pwmduty <<16));
             break;
          case 3:
             pwmtc  = 64000;             //10ms of cyle 
             pwmduty= 32000;
             pwmparmt = (pwmtc | (pwmduty <<16));
             break;
          case 4:
             pwmtc  = 146;                
             pwmduty= 56;
             pwmparmt = (pwmtc | (pwmduty <<16));
             break;
          case 5:
             pwmtc  = 146;                
             pwmduty= 112;
             pwmparmt = (pwmtc | (pwmduty <<16));
             break;          
          default:
             break;
       }
       ioctl(fd1,PwmStt,pwmparmt);           //set the pwm cycle and duty cycle                     
       sleep(10);
    }
    ioctl(fd1,PwmStp,0);
    if(close(fd1)<0) {
       perror("close");
       exit(EXIT_FAILURE);
    }
    printf("finished FFT pwm test\n");
    exit(EXIT_SUCCESS);

}