X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=src%2Fhardware%2Fhantek-6xxx%2Fprotocol.c;h=12a56ab9d09970589aa0fd1e25c46ed29ebc5cc2;hb=16544b38567ce7fa309c1b7da886f3c0c85b1e29;hp=37380490a80d25bcc1c25c7c0f372d61735ec378;hpb=f2a66a8ee669df5afa1b7bdade6e25ac0857fe4b;p=libsigrok.git

diff --git a/src/hardware/hantek-6xxx/protocol.c b/src/hardware/hantek-6xxx/protocol.c
index 37380490..12a56ab9 100644
--- a/src/hardware/hantek-6xxx/protocol.c
+++ b/src/hardware/hantek-6xxx/protocol.c
@@ -39,11 +39,7 @@ SR_PRIV int hantek_6xxx_open(struct sr_dev_inst *sdi)
 
 	libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 	for (i = 0; devlist[i]; i++) {
-		if ((err = libusb_get_device_descriptor(devlist[i], &des))) {
-			sr_err("Failed to get device descriptor: %s.",
-			       libusb_error_name(err));
-			continue;
-		}
+		libusb_get_device_descriptor(devlist[i], &des);
 
 		if (des.idVendor != devc->profile->fw_vid
 		    || des.idProduct != devc->profile->fw_pid)
@@ -127,7 +123,7 @@ SR_PRIV int hantek_6xxx_get_channeldata(const struct sr_dev_inst *sdi,
 	transfer = libusb_alloc_transfer(0);
 	libusb_fill_bulk_transfer(transfer, usb->devhdl, HANTEK_EP_IN, buf,
 			data_amount, cb, (void *)sdi, 4000);
-	if ((ret = libusb_submit_transfer(transfer)) != 0) {
+	if ((ret = libusb_submit_transfer(transfer)) < 0) {
 		sr_err("Failed to submit transfer: %s.",
 			libusb_error_name(ret));
 		/* TODO: Free them all. */
@@ -219,6 +215,16 @@ SR_PRIV int hantek_6xxx_update_vdiv(const struct sr_dev_inst *sdi)
 	return MIN(ret1, ret2);
 }
 
+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);
+}
+
 SR_PRIV int hantek_6xxx_update_channels(const struct sr_dev_inst *sdi)
 {
 	struct dev_context *devc = sdi->priv;
@@ -234,6 +240,7 @@ SR_PRIV int hantek_6xxx_init(const struct sr_dev_inst *sdi)
 
 	hantek_6xxx_update_samplerate(sdi);
 	hantek_6xxx_update_vdiv(sdi);
+	hantek_6xxx_update_coupling(sdi);
 	// hantek_6xxx_update_channels(sdi); /* Only 2 channel mode supported. */
 
 	return SR_OK;