285 lines
8.5 KiB
C
285 lines
8.5 KiB
C
/*
|
|
* This file is part of the sigrok project.
|
|
*
|
|
* Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include <glib.h>
|
|
#include "libsigrok.h"
|
|
#include "libsigrok-internal.h"
|
|
#include "protocol.h"
|
|
|
|
/*
|
|
* Driver for various UNI-T multimeters (and rebranded ones).
|
|
*
|
|
* Most UNI-T DMMs can be used with two (three) different PC interface cables:
|
|
* - The UT-D04 USB/HID cable, old version with Hoitek HE2325U chip.
|
|
* - The UT-D04 USB/HID cable, new version with WCH CH9325 chip.
|
|
* - The UT-D01 RS232 cable.
|
|
*
|
|
* This driver is meant to support all three cables, and various DMMs that
|
|
* can be attached to a PC via these cables. Currently only the UT-D04 cable
|
|
* (new version) is supported.
|
|
*
|
|
* The data for one DMM packet (e.g. 14 bytes if the respective DMM uses a
|
|
* Fortune Semiconductor FS9922-DMM4 chip) is spread across multiple
|
|
* 8-byte chunks.
|
|
*
|
|
* An 8-byte chunk looks like this:
|
|
* - Byte 0: 0xfz, where z is the number of actual data bytes in this chunk.
|
|
* - Bytes 1-7: z data bytes, the rest of the bytes should be ignored.
|
|
*
|
|
* Example:
|
|
* f0 00 00 00 00 00 00 00 (no data bytes)
|
|
* f2 55 77 00 00 00 00 00 (2 data bytes, 0x55 and 0x77)
|
|
* f1 d1 00 00 00 00 00 00 (1 data byte, 0xd1)
|
|
*
|
|
* Chips and serial settings used in UNI-T DMMs (and rebranded ones):
|
|
* - UNI-T UT108: ?
|
|
* - UNI-T UT109: ?
|
|
* - UNI-T UT30A: ?
|
|
* - UNI-T UT30E: ?
|
|
* - UNI-T UT60E: Fortune Semiconductor FS9721_LP3
|
|
* - UNI-T UT60G: ?
|
|
* - UNI-T UT61B: ?
|
|
* - UNI-T UT61C: ?
|
|
* - UNI-T UT61D: Fortune Semiconductor FS9922-DMM4
|
|
* - UNI-T UT61E: Cyrustek ES51922
|
|
* - UNI-T UT70B: ?
|
|
* - Voltcraft VC-820: Fortune Semiconductor FS9721_LP3
|
|
* - Voltcraft VC-840: Fortune Semiconductor FS9721_LP3
|
|
* - ...
|
|
*/
|
|
|
|
static void decode_packet(struct dev_context *devc, int dmm, const uint8_t *buf)
|
|
{
|
|
struct sr_datafeed_packet packet;
|
|
struct sr_datafeed_analog analog;
|
|
struct fs9721_info info;
|
|
float floatval;
|
|
int ret;
|
|
|
|
memset(&analog, 0, sizeof(struct sr_datafeed_analog));
|
|
|
|
/* Parse the protocol packet. */
|
|
ret = SR_ERR;
|
|
if (dmm == UNI_T_UT61D)
|
|
ret = sr_dmm_parse_fs9922(buf, &floatval, &analog);
|
|
else if (dmm == VOLTCRAFT_VC820)
|
|
ret = sr_fs9721_parse(buf, &floatval, &analog, &info);
|
|
if (ret != SR_OK) {
|
|
sr_err("Invalid DMM packet, ignoring.");
|
|
return;
|
|
}
|
|
|
|
/* Send a sample packet with one analog value. */
|
|
analog.num_samples = 1;
|
|
analog.data = &floatval;
|
|
packet.type = SR_DF_ANALOG;
|
|
packet.payload = &analog;
|
|
sr_session_send(devc->cb_data, &packet);
|
|
|
|
/* Increase sample count. */
|
|
devc->num_samples++;
|
|
}
|
|
|
|
static int hid_chip_init(struct dev_context *devc, uint16_t baudrate)
|
|
{
|
|
int ret;
|
|
uint8_t buf[5];
|
|
|
|
/* Detach kernel drivers which grabbed this device (if any). */
|
|
if (libusb_kernel_driver_active(devc->usb->devhdl, 0) == 1) {
|
|
ret = libusb_detach_kernel_driver(devc->usb->devhdl, 0);
|
|
if (ret < 0) {
|
|
sr_err("Failed to detach kernel driver: %s.",
|
|
libusb_error_name(ret));
|
|
return SR_ERR;
|
|
}
|
|
sr_dbg("Successfully detached kernel driver.");
|
|
} else {
|
|
sr_dbg("No need to detach a kernel driver.");
|
|
}
|
|
|
|
/* Claim interface 0. */
|
|
if ((ret = libusb_claim_interface(devc->usb->devhdl, 0)) < 0) {
|
|
sr_err("Failed to claim interface 0: %s.",
|
|
libusb_error_name(ret));
|
|
return SR_ERR;
|
|
}
|
|
sr_dbg("Successfully claimed interface 0.");
|
|
|
|
/* Baudrate example: 19230 baud -> HEX(19230) == 0x4b1e */
|
|
buf[0] = baudrate & 0xff; /* Baudrate, LSB */
|
|
buf[1] = (baudrate >> 8) & 0xff; /* Baudrate, MSB */
|
|
buf[2] = 0x00; /* Unknown/unused (?) */
|
|
buf[3] = 0x00; /* Unknown/unused (?) */
|
|
buf[4] = 0x03; /* Unknown, always 0x03. */
|
|
|
|
/* Send HID feature report to setup the baudrate/chip. */
|
|
sr_dbg("Sending initial HID feature report.");
|
|
sr_spew("HID init = 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x (%d baud)",
|
|
buf[0], buf[1], buf[2], buf[3], buf[4], baudrate);
|
|
ret = libusb_control_transfer(
|
|
devc->usb->devhdl, /* libusb device handle */
|
|
LIBUSB_REQUEST_TYPE_CLASS |
|
|
LIBUSB_RECIPIENT_INTERFACE |
|
|
LIBUSB_ENDPOINT_OUT,
|
|
9, /* bRequest: HID set_report */
|
|
0x300, /* wValue: HID feature, report number 0 */
|
|
0, /* wIndex: interface 0 */
|
|
(unsigned char *)&buf, /* payload buffer */
|
|
5, /* wLength: 5 bytes payload */
|
|
1000 /* timeout (ms) */);
|
|
|
|
if (ret < 0) {
|
|
sr_err("HID feature report error: %s.", libusb_error_name(ret));
|
|
return SR_ERR;
|
|
}
|
|
|
|
if (ret != 5) {
|
|
/* TODO: Handle better by also sending the remaining bytes. */
|
|
sr_err("Short packet: sent %d/5 bytes.", ret);
|
|
return SR_ERR;
|
|
}
|
|
|
|
sr_dbg("Successfully sent initial HID feature report.");
|
|
|
|
return SR_OK;
|
|
}
|
|
|
|
static void log_8byte_chunk(const uint8_t *buf)
|
|
{
|
|
sr_spew("8-byte chunk: %02x %02x %02x %02x %02x %02x %02x %02x "
|
|
"(%d data bytes)", buf[0], buf[1], buf[2], buf[3],
|
|
buf[4], buf[5], buf[6], buf[7], (buf[0] & 0x0f));
|
|
}
|
|
|
|
static void log_dmm_packet(const uint8_t *buf)
|
|
{
|
|
sr_dbg("DMM packet: %02x %02x %02x %02x %02x %02x %02x"
|
|
" %02x %02x %02x %02x %02x %02x %02x",
|
|
buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6],
|
|
buf[7], buf[8], buf[9], buf[10], buf[11], buf[12], buf[13]);
|
|
}
|
|
|
|
static int uni_t_dmm_receive_data(int fd, int revents, int dmm, void *cb_data)
|
|
{
|
|
struct sr_dev_inst *sdi;
|
|
struct dev_context *devc;
|
|
int i, ret, len, num_databytes_in_chunk;
|
|
uint8_t buf[CHUNK_SIZE];
|
|
uint8_t *pbuf;
|
|
static gboolean first_run = TRUE, synced_on_first_packet = FALSE;
|
|
static uint64_t data_byte_counter = 0;
|
|
|
|
(void)fd;
|
|
(void)revents;
|
|
|
|
sdi = cb_data;
|
|
devc = sdi->priv;
|
|
|
|
pbuf = devc->protocol_buf;
|
|
|
|
/* On the first run, we need to init the HID chip. */
|
|
if (first_run) {
|
|
/* TODO: The baudrate is DMM-specific (UT61D: 19230). */
|
|
if ((ret = hid_chip_init(devc, 19230)) != SR_OK) {
|
|
sr_err("HID chip init failed: %d.", ret);
|
|
return FALSE;
|
|
}
|
|
memset(pbuf, 0x00, NUM_DATA_BYTES);
|
|
first_run = FALSE;
|
|
}
|
|
|
|
memset(&buf, 0x00, CHUNK_SIZE);
|
|
|
|
/* Get data from EP2 using an interrupt transfer. */
|
|
ret = libusb_interrupt_transfer(
|
|
devc->usb->devhdl, /* libusb device handle */
|
|
LIBUSB_ENDPOINT_IN | 2, /* EP2, IN */
|
|
(unsigned char *)&buf, /* receive buffer */
|
|
CHUNK_SIZE, /* wLength */
|
|
&len, /* actually received byte count */
|
|
1000 /* timeout (ms) */);
|
|
|
|
if (ret < 0) {
|
|
sr_err("USB receive error: %s.", libusb_error_name(ret));
|
|
return FALSE;
|
|
}
|
|
|
|
if (len != CHUNK_SIZE) {
|
|
sr_err("Short packet: received %d/%d bytes.", len, CHUNK_SIZE);
|
|
/* TODO: Print the bytes? */
|
|
return FALSE;
|
|
}
|
|
|
|
log_8byte_chunk((const uint8_t *)&buf);
|
|
|
|
if (buf[0] != 0xf0) {
|
|
/* First time: Synchronize to the start of a packet. */
|
|
if (!synced_on_first_packet) {
|
|
if (dmm == UNI_T_UT61D) {
|
|
/* Valid packets start with '+' or '-'. */
|
|
if ((buf[1] != '+') && buf[1] != '-')
|
|
return TRUE;
|
|
} else if (dmm == VOLTCRAFT_VC820) {
|
|
/* Valid packets have 0x1 as high nibble. */
|
|
if (!sr_fs9721_is_packet_start(buf[1]))
|
|
return TRUE;
|
|
}
|
|
synced_on_first_packet = TRUE;
|
|
sr_spew("Successfully synchronized on first packet.");
|
|
}
|
|
|
|
num_databytes_in_chunk = buf[0] & 0x0f;
|
|
for (i = 0; i < num_databytes_in_chunk; i++)
|
|
pbuf[data_byte_counter++] = buf[1 + i];
|
|
|
|
/* TODO: Handle > 14 bytes in pbuf? Can this happen? */
|
|
if (data_byte_counter == NUM_DATA_BYTES) {
|
|
log_dmm_packet(pbuf);
|
|
data_byte_counter = 0;
|
|
if (!sr_fs9721_packet_valid(pbuf)) {
|
|
sr_err("Invalid packet.");
|
|
return TRUE;
|
|
}
|
|
decode_packet(devc, dmm, pbuf);
|
|
memset(pbuf, 0x00, NUM_DATA_BYTES);
|
|
}
|
|
}
|
|
|
|
/* Abort acquisition if we acquired enough samples. */
|
|
if (devc->limit_samples && devc->num_samples >= devc->limit_samples) {
|
|
sr_info("Requested number of samples reached.");
|
|
sdi->driver->dev_acquisition_stop(sdi, cb_data);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
SR_PRIV int uni_t_ut61d_receive_data(int fd, int revents, void *cb_data)
|
|
{
|
|
return uni_t_dmm_receive_data(fd, revents, UNI_T_UT61D, cb_data);
|
|
}
|
|
|
|
SR_PRIV int voltcraft_vc820_receive_data(int fd, int revents, void *cb_data)
|
|
{
|
|
return uni_t_dmm_receive_data(fd, revents, VOLTCRAFT_VC820, cb_data);
|
|
}
|