uni-t-dmm: Fix UT61E bug related to the UNI-T UD-D04 cable.

[libsigrok.git] / hardware / uni-t-dmm / api.c

diff --git a/hardware/uni-t-dmm/api.c b/hardware/uni-t-dmm/api.c
index dbab6da95e6ef6261c96cc26eb1764613b63ecc8..05c1c47e4e0204c2b53ec9f4d771a3eaaacb37fa 100644 (file)
--- a/hardware/uni-t-dmm/api.c
+++ b/hardware/uni-t-dmm/api.c
@@ -76,7 +76,16 @@ SR_PRIV struct dmm_info udmms[] = {
                &uni_t_ut61d_driver_info, receive_data_UNI_T_UT61D,
        },
        {
-               "UNI-T", "UT61E", 19230,
+               /*
+                * Important: The actual baudrate of the Cyrustek ES51922 chip
+                * used in this DMM is 19230. However, the WCH CH9325 chip
+                * (UART to USB/HID) used in (some versions of) the UNI-T
+                * UT-D04 cable doesn't support 19230 baud. It only supports
+                * 19200, and setting an unsupported baudrate will result in
+                * the default of 2400 being used (which will not work with
+                * this DMM, of course).
+                */
+               "UNI-T", "UT61E", 19200,
                ES51922_PACKET_SIZE, NULL,
                sr_es51922_packet_valid, sr_es51922_parse,
                NULL,