kecheng-kc-330b: Check device status before acquisition

[libsigrok.git] / hardware / kecheng-kc-330b / api.c

diff --git a/hardware/kecheng-kc-330b/api.c b/hardware/kecheng-kc-330b/api.c
index 1555ac4872721252bfa2e943fd80680e1399d612..66984e9a2af51f65b2202f5b113edc6772c31d15 100644 (file)
--- a/hardware/kecheng-kc-330b/api.c
+++ b/hardware/kecheng-kc-330b/api.c
@@ -431,6 +431,19 @@ static int dev_acquisition_start(const struct sr_dev_inst *sdi,
        devc->cb_data = cb_data;
        devc->num_samples = 0;
 
+       if (devc->data_source == DATA_SOURCE_LIVE) {
+               if (kecheng_kc_330b_status_get(sdi, &ret) != SR_OK)
+                       return SR_ERR;
+               sr_dbg("st %s", ret == DEVICE_ACTIVE ? "act" : "deact");
+               if (ret != DEVICE_ACTIVE) {
+                       sr_err("Device is inactive");
+                       /* Still continue though, since the device will
+                        * just return 30.0 until the user hits the button
+                        * on the device -- and then start feeding good
+                        * samples back. */
+               }
+       }
+
        if (!(devc->xfer = libusb_alloc_transfer(0)))
                return SR_ERR;