If i2c tools are not working your script won't work either. Your really need to show more info to troubleshoot this...
Chip address conflict perhaps? On Dec 11, 2014 12:39 AM, <[email protected]> wrote: > > > On Thursday, December 11, 2014 11:39:35 AM UTC+5:30, [email protected] > wrote: >> >> Hi, >> >> I am trying to read two bytes of data from a board(slave) using >> BBB(master) through i2c interface. >> >> I connected my board's SDA and SCL lines to P9_18 and P9_17 of BBB >> respectively. >> >> My code is >> >> #include <stdio.h> >> #include <errno.h> >> #include <string.h> >> #include <fcntl.h> >> #include <stdlib.h> >> #include <unistd.h> >> #include <linux/i2c-dev.h> >> #include <sys/ioctl.h> >> >> >> int main() >> { >> int fd,i; >> int addr = 0x43; >> char buffer[10] = {0}; >> >> fd = open("/dev/i2c-1", O_RDWR); // opening i2c-1 file. returns a file >> descriptor used by read >> if(fd < 0) >> { >> printf("i2c failed to open\n"); >> } >> >> if(ioctl(fd, I2C_SLAVE, addr) < 0) >> printf("failed to acquire bus\n"); >> >> if(read(fd,buffer,2) != 2) //reading 2 bytes of data >> { >> printf("i2c read failed\n"); >> >> } >> else >> { >> for(i=0;i<2;i++) >> printf("the data is %d \n",buffer[i]); >> } >> >> >> return 0; >> } >> >> >> >> >> >> >> I got output --- "i2c read failed" >> >> What is the problem in my code? Or any problem in hardware? When I >> checked the following command, I got output like >> >> root@beaglebone:~# i2cdetect -l >> i2c-0 i2c OMAP I2C adapter I2C >> adapter >> i2c-1 i2c OMAP I2C adapter I2C >> adapter >> root@beaglebone:~# ls -l /sys/bus/i2c/devices/i2c-* >> lrwxrwxrwx 1 root root 0 Jan 1 2000 /sys/bus/i2c/devices/i2c-0 -> >> ../../../devices/ocp.3/44e0b000.i2c/i2c-0 >> lrwxrwxrwx 1 root root 0 Jan 1 2000 /sys/bus/i2c/devices/i2c-1 -> >> ../../../devices/ocp.3/4819c000.i2c/i2c-1 >> >> >> Can anyone find problem? Please reply. >> > > > I tried i2cget command but it also showing Error: Read failed. > > What it means? Any hardware problem? How i trace the problem? > > > > > > > > > > > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
