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I2C scanner code for SL030
// by @guyzmo under WTFPL license
// http://i.got.nothing.to/hack/on/run-the-sl030-rfid-reader-on-linux/
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <linux/i2c-dev.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <time.h>
const char STATUS[][32] = {
/*0x00*/ "Operation succeed",
/*0x01*/ "No tag",
/*0x02*/ "Login succeed",
/*0x03*/ "Login fail",
/*0x04*/ "Read fail",
/*0x05*/ "Write fail",
/*0x06*/ "Unable to read after write",
/*0x08*/ "Address overflow",
/*0x09*/ "Download Key fail",
/*0x0A*/ "Collision occur",
/*0x0C*/ "Load key fail",
/*0x0D*/ "Not authenticate",
/*0x0E*/ "Not a value block"
};
int main(void) {
int file;
char filename[40];
const char *buffer;
int addr = 0x50; // Addr of SL030
sprintf(filename,"/dev/i2c-3");
if ((file = open(filename,O_RDWR)) < 0) {
printf("Failed to open the bus.");
exit(1);
}
if (ioctl(file,I2C_SLAVE,addr) < 0) {
printf("Failed to acquire bus access and/or talk to slave.\n");
exit(1);
}
char buf[128] = {0};
for (int i=0;i<128;++i) buf[i] = 0;
// ------------ WRITE COMMAND ------------------
unsigned char reg = 0x01; // Device register to access
buf[0] = 1;
buf[1] = reg;
if (write(file,buf,2) != 2) {
// ERROR HANDLING: i2c transaction failed
printf("Failed to write to the i2c bus.\n");
buffer = strerror(errno);
printf(buffer);
printf("\n\n");
} else {
printf("write success\n\n");
}
for (int i=0;i<128;++i) buf[i] = 0;
struct timespec tim, tim2;
tim.tv_sec = 0;
tim.tv_nsec = 20000000;
nanosleep(&tim,&tim2);
// ------------ READ CARD STATUS ------------------
unsigned short len=0;
unsigned short cmd=0;
unsigned short sta=0;
// Using I2C Read
if (read(file,buf,128) <= 0) {
// ERROR HANDLING: i2c transaction failed
printf("Failed to read from the i2c bus.\n");
buffer = strerror(errno);
printf(buffer);
printf("\n\n");
return 1;
}
len = (unsigned short)buf[0];
cmd = (unsigned short)buf[1];
sta = (unsigned short)buf[2];
printf("Length: %d\n",len);
printf("Command: 0x%02X\n",cmd);
printf("Status: %s\n",STATUS[sta]);
printf("Data: ");
for (int i=3;i<len;++i)
printf("%02X;", buf[i]);
printf("\n\n");
return 0;
}
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