X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=src%2Fhardware%2Fhantek-6xxx%2Fprotocol.c;h=a43f72bbb546247abcd8ce68cfce68c19478d501;hb=364b09c2a936fd7e98a879c3532fcd2fee4c1e0a;hp=12a56ab9d09970589aa0fd1e25c46ed29ebc5cc2;hpb=cc5ebc8a3d66e15ade82475ae890e0dafe9b4586;p=libsigrok.git

diff --git a/src/hardware/hantek-6xxx/protocol.c b/src/hardware/hantek-6xxx/protocol.c
index 12a56ab9..a43f72bb 100644
--- a/src/hardware/hantek-6xxx/protocol.c
+++ b/src/hardware/hantek-6xxx/protocol.c
@@ -220,9 +220,13 @@ SR_PRIV int hantek_6xxx_update_coupling(const struct sr_dev_inst *sdi)
 	struct dev_context *devc = sdi->priv;
 	uint8_t coupling = 0xFF & ((devc->coupling[1] << 4) | devc->coupling[0]);
 
-	sr_dbg("update coupling 0x%x", coupling);
-
-	return write_control(sdi, COUPLING_REG, coupling);
+	if (devc->has_coupling) {
+		sr_dbg("update coupling 0x%x", coupling);
+		return write_control(sdi, COUPLING_REG, coupling);
+	} else {
+		sr_dbg("coupling not supported");
+		return SR_OK;
+	}
 }
 
 SR_PRIV int hantek_6xxx_update_channels(const struct sr_dev_inst *sdi)