glow led -- Using GPIO - Raspberry Pi Forums

please suggest.

suppose want blink led after every 10msec on target in while loop.
need code in target root file system. runs onto target . how

have user space code :

code: select all

code: #include <stdio.h>  #include <string.h>  #include <fcntl.h>  #include <sys/ioctl.h>   #define samsung_led_writereg 0  #define samsung_led_readreg  1   int main(int argc,char **argv)  {      int fd=open("/dev/samsungled",o_rdwr);      int arg;      if(argc==1)          arg=0x00;      else if(argc==2)         {          arg=atoi(argv[1]);      }      if(arg>15)          arg=0;           printf("d\n",arg);              printf("=============test begin=============\n");      if(fd == -1)      {          printf("open file error\n");          exit(0);      }       if(ioctl(fd,arg,0)==-1)      {          printf("ioctl error\n");          exit(0);      }      printf("==============test end===============\n");       close(fd);  }

i new user to rpi , don't use c @ forgive me not understanding example code.

however, did simple thing led asking about, used library rpi called wiringpi designed drive gpio pins , followed simple tutorial on wiringpi website:

first installed using directions on page, first part, didn't need "older" way mentions:
https://projects.drogon.net/raspberry-p ... d-install/

followed simple tutorial leds blinking simple shell script commands:
https://projects.drogon.net/raspberry-p ... ingle-led/

supports c work gpio pins:
https://projects.drogon.net/raspberry-p ... /examples/

hope helps some.

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