serial-dmm: Increase timeout when scanning for DMMs.

We have to wait a bit longer than 1s for a valid DMM packet to arrive,
since for various DMMs some modes (Hz/% for example) the packets will
arrive a lot less often than in other modes. If the waiting period is
too short detection of the DMM will fail.

diff --git a/hardware/serial-dmm/api.c b/hardware/serial-dmm/api.c
index 7091222fddb7c236fa14ec846f798131688698b1..b5892758977a3ce8bdad07134d5256877de0f8be 100644 (file)
--- a/hardware/serial-dmm/api.c
+++ b/hardware/serial-dmm/api.c
@@ -329,7 +329,7 @@ static GSList *sdmm_scan(const char *conn, const char *serialcomm, int dmm)
        /* Let's get a bit of data and see if we can find a packet. */
        len = sizeof(buf);
        ret = serial_stream_detect(serial, buf, &len, dmms[dmm].packet_size,
-                                  dmms[dmm].packet_valid, 1000,
+                                  dmms[dmm].packet_valid, 3000,
                                   dmms[dmm].baudrate);
        if (ret != SR_OK)
                goto scan_cleanup;