attenuator: Print level at time of write.

projects/rfdsatt/attenuator.c

@@ -68,6 +68,8 @@ int attenuator_set(uint8_t channel, uint8_t stage, uint8_t val_qdb)
 	if (val > 0x1f)
 		return -ERANGE;
 
+	printf("Setting CH%u-ST%u to %u dB\r\n", channel, stage, val);
+
 	/* the DAT-31A-SP actually has a B0 which works in half-dB steps,
 	 * but according to the manual it must alsays be 0 */
 	val = val * 2;