Embest AM3517 Specifications download pdf (Page 61)

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4.7 Linux Application Development

This section will introduce how to conduct application development on the

SOC8200 hardware platform, including the formation of an SOC8200

software environment. Examples will be taken to show the general process

of the development of SOC8200 applications.

4.7.1 LED application development

1. Coding

Led_acc.c source code is shown below, The led lamps on the development

board will flash.

#include <stdio.h>

#include <unistd.h>

#include <sys/types.h>

#include <sys/ipc.h>

#include <sys/ioctl.h>

#include <fcntl.h>

#define LED "/sys/class/leds/led/brightness"

int main(int argc, char *argv[])

{

int f_led;

unsigned char i = 0;

unsigned char dat;

if((f_led = open(LED, O_RDWR)) < 0){

printf("error in open %s",LED);

return -1;

}

for(;;){

i++;

//dat = i&0x1 ? '1':'0';

//dat = (i&0x2)>>1 ? '1':'0';

dat = (i&0x4)>>2 ? '1':'0';

write(f_led, &dat, sizeof(dat));

usleep(300000);

}

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Embest AM3517 Specifications Page 61