i2cget: add support for reading without passing command

i2cget can be used without passing command byte i2cget 3 0x50 0x5F <-- should shift out register 0x5F i2cget 3 0x50 <-- should shift out register 0x60
landley · Mar 18, 2023 · ba5b7c2 · ba5b7c2
1 parent e8f2f55
commit ba5b7c2
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/toys/other/i2ctools.c b/toys/other/i2ctools.c
@@ -271,7 +271,10 @@ void i2cget_main(void)
   confirm("Read register 0x%02x from chip 0x%02x on bus %d?", addr, chip, bus);
 
   fd = i2c_open(bus, FLAG(f) ? I2C_SLAVE_FORCE : I2C_SLAVE, chip);
-  if (i2c_read_byte(fd, addr, &byte)==-1) perror_exit("i2c_read_byte");
+  if (toys.optc == 3) {
+    if (i2c_read_byte(fd, addr, &byte)==-1) perror_exit("i2c_read_byte");
+  } else if (read(fd, &byte, 1) != 1) perror_exit("i2c_read");
+
   printf("0x%02x\n", byte);
   close(fd);
 }