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I2C_serial_pi2.py

@@ -38,6 +38,8 @@ class I2C:
         try:
             (count, rd_value) = pi.i2c_read_i2c_block_data(bus, register, bytes_to_read)
             ret_value = ''
+            if len(rd_value) < bytes_to_read:
+                return False, 999
             for cnt in range(bytes_to_read):
                 ret_value += (hex(rd_value[cnt])[2:])
             ret_ack = 1