static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data) { struct dev_context *devc; (void)cb_data; if (sdi->status != SR_ST_ACTIVE) return SR_ERR_DEV_CLOSED; /* Signal USB transfer handler to clean up and stop. */ sdi->status = SR_ST_STOPPING; devc = sdi->priv; if (devc->data_source == DATA_SOURCE_MEMORY && devc->config_dirty) { /* The protocol doesn't have a command to clear stored data; * it clears it whenever new configuration is set. That means * we can't just configure the device any time we want when * it's in DATA_SOURCE_MEMORY mode. The only safe time to do * it is now, when we're sure we've pulled in all the stored * data. */ kecheng_kc_330b_configure(sdi); } return SR_OK; }
static int dev_close(struct sr_dev_inst *sdi) { struct dev_context *devc; struct sr_usb_dev_inst *usb; if (!di->priv) { sr_err("Driver was not initialized."); return SR_ERR; } usb = sdi->conn; if (!usb->devhdl) /* Nothing to do. */ return SR_OK; /* This allows a frontend to configure the device without ever * doing an acquisition step. */ devc = sdi->priv; if (!devc->config_dirty) kecheng_kc_330b_configure(sdi); libusb_release_interface(usb->devhdl, USB_INTERFACE); libusb_close(usb->devhdl); usb->devhdl = NULL; sdi->status = SR_ST_INACTIVE; return SR_OK; }
static int dev_acquisition_start(const struct sr_dev_inst *sdi) { struct sr_dev_driver *di = sdi->driver; struct drv_context *drvc; struct dev_context *devc; struct sr_datafeed_packet packet; struct sr_datafeed_meta meta; struct sr_config *src; struct sr_usb_dev_inst *usb; GVariant *gvar, *rational[2]; const uint64_t *si; int req_len, buf_len, len, ret; unsigned char buf[9]; if (sdi->status != SR_ST_ACTIVE) return SR_ERR_DEV_CLOSED; drvc = di->context; devc = sdi->priv; usb = sdi->conn; devc->num_samples = 0; std_session_send_df_header(sdi); if (devc->data_source == DATA_SOURCE_LIVE) { /* Force configuration. */ kecheng_kc_330b_configure(sdi); if (kecheng_kc_330b_status_get(sdi, &ret) != SR_OK) return SR_ERR; 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. */ } } else { if (kecheng_kc_330b_log_info_get(sdi, buf) != SR_OK) return SR_ERR; devc->mqflags = buf[4] ? SR_MQFLAG_SPL_TIME_WEIGHT_S : SR_MQFLAG_SPL_TIME_WEIGHT_F; devc->mqflags |= buf[5] ? SR_MQFLAG_SPL_FREQ_WEIGHT_C : SR_MQFLAG_SPL_FREQ_WEIGHT_A; devc->stored_samples = (buf[7] << 8) | buf[8]; if (devc->stored_samples == 0) { /* Notify frontend of empty log by sending start/end packets. */ std_session_send_df_end(sdi); return SR_OK; } if (devc->limit_samples && devc->limit_samples < devc->stored_samples) devc->stored_samples = devc->limit_samples; si = kecheng_kc_330b_sample_intervals[buf[1]]; rational[0] = g_variant_new_uint64(si[0]); rational[1] = g_variant_new_uint64(si[1]); gvar = g_variant_new_tuple(rational, 2); src = sr_config_new(SR_CONF_SAMPLE_INTERVAL, gvar); packet.type = SR_DF_META; packet.payload = &meta; meta.config = g_slist_append(NULL, src); sr_session_send(sdi, &packet); g_free(src); } if (!(devc->xfer = libusb_alloc_transfer(0))) return SR_ERR; usb_source_add(sdi->session, drvc->sr_ctx, 10, kecheng_kc_330b_handle_events, (void *)sdi); if (devc->data_source == DATA_SOURCE_LIVE) { buf[0] = CMD_GET_LIVE_SPL; buf_len = 1; devc->state = LIVE_SPL_WAIT; devc->last_live_request = g_get_monotonic_time() / 1000; req_len = 3; } else { buf[0] = CMD_GET_LOG_DATA; buf[1] = 0; buf[2] = 0; buf_len = 4; devc->state = LOG_DATA_WAIT; if (devc->stored_samples < 63) buf[3] = devc->stored_samples; else buf[3] = 63; /* Command ack byte + 2 bytes per sample. */ req_len = 1 + buf[3] * 2; } ret = libusb_bulk_transfer(usb->devhdl, EP_OUT, buf, buf_len, &len, 5); if (ret != 0 || len != 1) { sr_dbg("Failed to start acquisition: %s", libusb_error_name(ret)); libusb_free_transfer(devc->xfer); return SR_ERR; } libusb_fill_bulk_transfer(devc->xfer, usb->devhdl, EP_IN, devc->buf, req_len, kecheng_kc_330b_receive_transfer, (void *)sdi, 15); if (libusb_submit_transfer(devc->xfer) != 0) { libusb_free_transfer(devc->xfer); return SR_ERR; } return SR_OK; }