309 lines
9.3 KiB
C
309 lines
9.3 KiB
C
/*
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* This file is part of the libsigrok project.
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*
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* Copyright (C) 2012-2013 Uwe Hermann <uwe@hermann-uwe.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <string.h>
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#include <glib.h>
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#include "libsigrok.h"
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#include "libsigrok-internal.h"
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#include "protocol.h"
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/*
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* Driver for various UNI-T multimeters (and rebranded ones).
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*
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* Most UNI-T DMMs can be used with two (three) different PC interface cables:
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* - The UT-D04 USB/HID cable, old version with Hoitek HE2325U chip.
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* - The UT-D04 USB/HID cable, new version with WCH CH9325 chip.
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* - The UT-D02 RS232 cable.
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*
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* This driver is meant to support all USB/HID cables, and various DMMs that
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* can be attached to a PC via these cables. Currently only the UT-D04 cable
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* (new version) is supported/tested.
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* The UT-D02 RS232 cable is handled by the 'serial-dmm' driver.
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*
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* The data for one DMM packet (e.g. 14 bytes if the respective DMM uses a
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* Fortune Semiconductor FS9922-DMM4 chip) is spread across multiple
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* 8-byte chunks.
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*
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* An 8-byte chunk looks like this:
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* - Byte 0: 0xfz, where z is the number of actual data bytes in this chunk.
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* - Bytes 1-7: z data bytes, the rest of the bytes should be ignored.
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*
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* Example:
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* f0 00 00 00 00 00 00 00 (no data bytes)
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* f2 55 77 00 00 00 00 00 (2 data bytes, 0x55 and 0x77)
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* f1 d1 00 00 00 00 00 00 (1 data byte, 0xd1)
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*/
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static void decode_packet(struct sr_dev_inst *sdi, int dmm, const uint8_t *buf,
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void *info)
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{
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struct dev_context *devc;
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struct sr_datafeed_packet packet;
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struct sr_datafeed_analog analog;
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float floatval;
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int ret;
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devc = sdi->priv;
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memset(&analog, 0, sizeof(struct sr_datafeed_analog));
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/* Parse the protocol packet. */
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ret = udmms[dmm].packet_parse(buf, &floatval, &analog, info);
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if (ret != SR_OK) {
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sr_dbg("Invalid DMM packet, ignoring.");
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return;
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}
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/* If this DMM needs additional handling, call the resp. function. */
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if (udmms[dmm].dmm_details)
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udmms[dmm].dmm_details(&analog, info);
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/* Send a sample packet with one analog value. */
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analog.probes = sdi->probes;
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analog.num_samples = 1;
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analog.data = &floatval;
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packet.type = SR_DF_ANALOG;
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packet.payload = &analog;
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sr_session_send(devc->cb_data, &packet);
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/* Increase sample count. */
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devc->num_samples++;
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}
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static int hid_chip_init(struct sr_dev_inst *sdi, uint16_t baudrate)
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{
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int ret;
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uint8_t buf[5];
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struct sr_usb_dev_inst *usb;
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usb = sdi->conn;
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/* Detach kernel drivers which grabbed this device (if any). */
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if (libusb_kernel_driver_active(usb->devhdl, 0) == 1) {
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ret = libusb_detach_kernel_driver(usb->devhdl, 0);
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if (ret < 0) {
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sr_err("Failed to detach kernel driver: %s.",
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libusb_error_name(ret));
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return SR_ERR;
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}
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sr_dbg("Successfully detached kernel driver.");
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} else {
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sr_dbg("No need to detach a kernel driver.");
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}
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/* Claim interface 0. */
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if ((ret = libusb_claim_interface(usb->devhdl, 0)) < 0) {
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sr_err("Failed to claim interface 0: %s.",
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libusb_error_name(ret));
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return SR_ERR;
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}
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sr_dbg("Successfully claimed interface 0.");
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/* Set data for the HID feature report (e.g. baudrate). */
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buf[0] = baudrate & 0xff; /* Baudrate, LSB */
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buf[1] = (baudrate >> 8) & 0xff; /* Baudrate, MSB */
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buf[2] = 0x00; /* Unknown/unused (?) */
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buf[3] = 0x00; /* Unknown/unused (?) */
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buf[4] = 0x03; /* Unknown, always 0x03. */
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/* Send HID feature report to setup the baudrate/chip. */
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sr_dbg("Sending initial HID feature report.");
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sr_spew("HID init = 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x (%d baud)",
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buf[0], buf[1], buf[2], buf[3], buf[4], baudrate);
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ret = libusb_control_transfer(
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usb->devhdl, /* libusb device handle */
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LIBUSB_REQUEST_TYPE_CLASS |
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LIBUSB_RECIPIENT_INTERFACE |
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LIBUSB_ENDPOINT_OUT,
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9, /* bRequest: HID set_report */
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0x300, /* wValue: HID feature, report number 0 */
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0, /* wIndex: interface 0 */
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(unsigned char *)&buf, /* payload buffer */
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5, /* wLength: 5 bytes payload */
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1000 /* timeout (ms) */);
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if (ret < 0) {
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sr_err("HID feature report error: %s.", libusb_error_name(ret));
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return SR_ERR;
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}
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if (ret != 5) {
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/* TODO: Handle better by also sending the remaining bytes. */
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sr_err("Short packet: sent %d/5 bytes.", ret);
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return SR_ERR;
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}
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sr_dbg("Successfully sent initial HID feature report.");
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return SR_OK;
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}
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static void log_8byte_chunk(const uint8_t *buf)
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{
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sr_spew("8-byte chunk: %02x %02x %02x %02x %02x %02x %02x %02x "
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"(%d data bytes)", buf[0], buf[1], buf[2], buf[3],
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buf[4], buf[5], buf[6], buf[7], (buf[0] & 0x0f));
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}
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static void log_dmm_packet(const uint8_t *buf)
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{
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sr_dbg("DMM packet: %02x %02x %02x %02x %02x %02x %02x"
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" %02x %02x %02x %02x %02x %02x %02x",
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buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6],
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buf[7], buf[8], buf[9], buf[10], buf[11], buf[12], buf[13]);
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}
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static int get_and_handle_data(struct sr_dev_inst *sdi, int dmm, void *info)
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{
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struct dev_context *devc;
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uint8_t buf[CHUNK_SIZE], *pbuf;
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int i, ret, len, num_databytes_in_chunk;
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struct sr_usb_dev_inst *usb;
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devc = sdi->priv;
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usb = sdi->conn;
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pbuf = devc->protocol_buf;
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/* On the first run, we need to init the HID chip. */
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if (devc->first_run) {
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if ((ret = hid_chip_init(sdi, udmms[dmm].baudrate)) != SR_OK) {
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sr_err("HID chip init failed: %d.", ret);
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return SR_ERR;
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}
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memset(pbuf, 0x00, DMM_BUFSIZE);
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devc->first_run = FALSE;
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}
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memset(&buf, 0x00, CHUNK_SIZE);
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/* Get data from EP2 using an interrupt transfer. */
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ret = libusb_interrupt_transfer(
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usb->devhdl, /* libusb device handle */
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LIBUSB_ENDPOINT_IN | 2, /* EP2, IN */
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(unsigned char *)&buf, /* receive buffer */
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CHUNK_SIZE, /* wLength */
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&len, /* actually received byte count */
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1000 /* timeout (ms) */);
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if (ret < 0) {
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sr_err("USB receive error: %s.", libusb_error_name(ret));
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return SR_ERR;
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}
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if (len != CHUNK_SIZE) {
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sr_err("Short packet: received %d/%d bytes.", len, CHUNK_SIZE);
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/* TODO: Print the bytes? */
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return SR_ERR;
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}
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log_8byte_chunk((const uint8_t *)&buf);
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/* If there are no data bytes just return (without error). */
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if (buf[0] == 0xf0)
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return SR_OK;
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devc->bufoffset = 0;
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/*
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* Append the 1-7 data bytes of this chunk to pbuf.
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*
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* Special case:
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* DMMs with Cyrustek ES51922 chip need serial settings of
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* 19230/7o1. The WCH CH9325 UART to USB/HID chip used in (some
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* versions of) the UNI-T UT-D04 cable however, will also send
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* the parity bit to the host in the 8-byte data chunks. This bit
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* is encoded in bit 7 of each of the 1-7 data bytes and must thus
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* be removed in order for the actual ES51922 protocol parser to
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* work properly.
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*/
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num_databytes_in_chunk = buf[0] & 0x0f;
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for (i = 0; i < num_databytes_in_chunk; i++, devc->buflen++) {
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pbuf[devc->buflen] = buf[1 + i];
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if (udmms[dmm].packet_parse == sr_es51922_parse)
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pbuf[devc->buflen] &= ~(1 << 7);
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}
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/* Now look for packets in that data. */
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while ((devc->buflen - devc->bufoffset) >= udmms[dmm].packet_size) {
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if (udmms[dmm].packet_valid(pbuf + devc->bufoffset)) {
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log_dmm_packet(pbuf + devc->bufoffset);
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decode_packet(sdi, dmm, pbuf + devc->bufoffset, info);
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devc->bufoffset += udmms[dmm].packet_size;
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} else {
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devc->bufoffset++;
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}
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}
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/* Move remaining bytes to beginning of buffer. */
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for (i = 0; i < devc->buflen - devc->bufoffset; i++)
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pbuf[i] = pbuf[devc->bufoffset + i];
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devc->buflen -= devc->bufoffset;
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return SR_OK;
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}
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static int receive_data(int fd, int revents, int dmm, void *info, void *cb_data)
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{
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int ret;
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struct sr_dev_inst *sdi;
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struct dev_context *devc;
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int64_t time_ms;
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(void)fd;
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(void)revents;
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sdi = cb_data;
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devc = sdi->priv;
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if ((ret = get_and_handle_data(sdi, dmm, info)) != SR_OK)
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return FALSE;
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/* Abort acquisition if we acquired enough samples. */
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if (devc->limit_samples && devc->num_samples >= devc->limit_samples) {
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sr_info("Requested number of samples reached.");
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sdi->driver->dev_acquisition_stop(sdi, cb_data);
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}
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if (devc->limit_msec) {
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time_ms = (g_get_monotonic_time() - devc->starttime) / 1000;
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if (time_ms > (int64_t)devc->limit_msec) {
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sr_info("Requested time limit reached.");
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sdi->driver->dev_acquisition_stop(sdi, cb_data);
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return TRUE;
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}
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}
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return TRUE;
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}
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#define RECEIVE_DATA(ID_UPPER, DMM_DRIVER) \
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SR_PRIV int receive_data_##ID_UPPER(int fd, int revents, void *cb_data) { \
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struct DMM_DRIVER##_info info; \
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return receive_data(fd, revents, ID_UPPER, &info, cb_data); }
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/* Driver-specific receive_data() wrappers */
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RECEIVE_DATA(TECPEL_DMM_8061, fs9721)
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RECEIVE_DATA(UNI_T_UT60A, fs9721)
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RECEIVE_DATA(UNI_T_UT60E, fs9721)
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RECEIVE_DATA(UNI_T_UT61D, fs9922)
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RECEIVE_DATA(UNI_T_UT61E, es51922)
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RECEIVE_DATA(VOLTCRAFT_VC820, fs9721)
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RECEIVE_DATA(VOLTCRAFT_VC830, fs9922)
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RECEIVE_DATA(VOLTCRAFT_VC840, fs9721)
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