mirror of
https://github.com/lm-sensors/lm-sensors.git
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Frodo Looijaard
11e88380d5
README.directories contains a description of the directories I created; read it if you have questions about them. doc/design is the design document I sent before through email. doc/useful_addresses.html contains links to I2C, SMBus and sensors information. Note that we may have to change minor i2c things, like Makefiles; this is why I put it in the archive too (we should, of course, send important changes to Simon Vogl). git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@3 7894878c-1315-0410-8ee3-d5d059ff63e0
69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
/* ------------------------------------------------------------------------- */
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/* detect -- look who's there. Gets address acks from all devices on the bus.*/
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/* It should not change any values in the peripherals. */
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/* ------------------------------------------------------------------------- */
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static char *rcsid="$Id: detect.c,v 2.2 1996/11/17 22:03:06 i2c Exp $";
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <errno.h>
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#include <linux/delay.h>
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#include "i2c.h"
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#define Write(a,b,c) err(1,write(a,b,c))
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#define Read(a,b,c) err(0,read(a,b,c))
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void err(int wr, int d){
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if (d==-1){
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printf("%s error: %s !\n",(wr)?"Write":"Read",strerror(errno));
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}
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}
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#define ERR(x) printf("return value: %d\n", (x) );
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int main(int argc, char *argv[]){
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int i,f;
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char b[40],c;
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char *device = "/dev/i2c0";
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/* parse options */
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opterr=1;
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while ( (c=getopt(argc,argv,"hH?d:")) != -1) {
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switch (c){
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case 'd':
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if (optarg)
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device = optarg;
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break;
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case 'h':
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case 'H':
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case '?':
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default:
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printf("%s tries to detect devices on the i2c-bus. Usage:\n",argv[0]);
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printf("-d device device to use\n");
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return 0;
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}
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}
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f=open(device,O_RDWR);
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if (f<0){
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perror("detect");
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exit(1);
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}
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ERR( ioctl(f,I2C_UDELAY,10) );
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ERR( ioctl(f,I2C_MDELAY,0) );
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// ERR( ioctl(f,I2C_RETRIES,3) );
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for (i=0;i<128;i++){
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ioctl(f,I2C_SLAVE,i);
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if (0>read (f,b,0) ) {
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putchar('.');
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} else {
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printf("\n%d worked! \n",i);
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}
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usleep(100);
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fflush(stdout);
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}
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putchar('\n');
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return close(f);
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}
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