mso-19: Initial analog probe support (unfinished).

[libsigrok.git] / hardware / link-mso19 / protocol.c

diff --git a/hardware/link-mso19/protocol.c b/hardware/link-mso19/protocol.c
index d41a9e72251fc4817e29c3d92f70fc2464c0ed57..ab77a5a15eb26e05f7c5b8353d9948e9a9281164 100644 (file)
--- a/hardware/link-mso19/protocol.c
+++ b/hardware/link-mso19/protocol.c
@@ -333,7 +333,7 @@ SR_PRIV int mso_configure_rate(const struct sr_dev_inst *sdi, uint32_t rate)
        return ret;
 }
 
-SR_PRIV int mso_check_trigger(struct sr_serial_dev_inst *serial, uint8_t * info)
+SR_PRIV int mso_check_trigger(struct sr_serial_dev_inst *serial, uint8_t *info)
 {
        uint16_t ops[] = { mso_trans(REG_TRIGGER, 0) };
        int ret;
@@ -346,7 +346,8 @@ SR_PRIV int mso_check_trigger(struct sr_serial_dev_inst *serial, uint8_t * info)
        uint8_t buf = 0;
        if (serial_read(serial, &buf, 1) != 1)  /* FIXME: Need timeout */
                ret = SR_ERR;
-       *info = buf;
+       if (!info)
+               *info = buf;
 
        sr_dbg("Trigger state is: 0x%x.", *info);
        return ret;