2 * This file is part of the libsigrok project.
4 * Copyright (C) 2020 Andreas Sandberg <andreas@sandberg.pp.se>
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
25 #include <nettle/aes.h>
26 #include <libsigrok/libsigrok.h>
27 #include "libsigrok-internal.h"
30 #define SERIAL_WRITE_TIMEOUT_MS 1
32 #define TC_POLL_LEN 192
33 #define TC_POLL_PERIOD_MS 100
34 #define TC_TIMEOUT_MS 1000
36 static const char POLL_CMD[] = "getva";
38 #define MAGIC_PAC1 0x31636170UL
39 #define MAGIC_PAC2 0x32636170UL
40 #define MAGIC_PAC3 0x33636170UL
42 /* Length of PAC block excluding CRC */
43 #define PAC_DATA_LEN 60
44 /* Length of PAC block including CRC */
47 /* Offset to PAC block from start of poll data */
48 #define OFF_PAC1 (0 * PAC_LEN)
49 #define OFF_PAC2 (1 * PAC_LEN)
50 #define OFF_PAC3 (2 * PAC_LEN)
60 static const uint8_t AES_KEY[] = {
61 0x58, 0x21, 0xfa, 0x56, 0x01, 0xb2, 0xf0, 0x26,
62 0x87, 0xff, 0x12, 0x04, 0x62, 0x2a, 0x4f, 0xb0,
63 0x86, 0xf4, 0x02, 0x60, 0x81, 0x6f, 0x9a, 0x0b,
64 0xa7, 0xf1, 0x06, 0x61, 0x9a, 0xb8, 0x72, 0x88,
67 static const struct binary_analog_channel rdtech_tc_channels[] = {
68 { "V", { 0 + 48, BVT_LE_UINT32, 1e-4, }, 4, SR_MQ_VOLTAGE, SR_UNIT_VOLT },
69 { "I", { 0 + 52, BVT_LE_UINT32, 1e-5, }, 5, SR_MQ_CURRENT, SR_UNIT_AMPERE },
70 { "D+", { 64 + 32, BVT_LE_UINT32, 1e-2, }, 2, SR_MQ_VOLTAGE, SR_UNIT_VOLT },
71 { "D-", { 64 + 36, BVT_LE_UINT32, 1e-2, }, 2, SR_MQ_VOLTAGE, SR_UNIT_VOLT },
72 { "E0", { 64 + 12, BVT_LE_UINT32, 1e-3, }, 3, SR_MQ_ENERGY, SR_UNIT_WATT_HOUR },
73 { "E1", { 64 + 20, BVT_LE_UINT32, 1e-3, }, 3, SR_MQ_ENERGY, SR_UNIT_WATT_HOUR },
77 static int check_pac_crc(uint8_t *data)
82 crc = sr_crc16(SR_CRC16_DEFAULT_INIT, data, PAC_DATA_LEN);
83 crc_field = RL32(data + PAC_DATA_LEN);
85 if (crc != crc_field) {
86 sr_spew("CRC error. Calculated: %0x" PRIx16 ", expected: %0x" PRIx32,
94 static int process_poll_pkt(struct dev_context *devc, uint8_t *dst)
96 struct aes256_ctx ctx;
98 aes256_set_decrypt_key(&ctx, AES_KEY);
99 aes256_decrypt(&ctx, TC_POLL_LEN, dst, devc->buf);
101 if (RL32(dst + OFF_PAC1) != MAGIC_PAC1 ||
102 RL32(dst + OFF_PAC2) != MAGIC_PAC2 ||
103 RL32(dst + OFF_PAC3) != MAGIC_PAC3) {
104 sr_err("Invalid poll packet magic values!");
108 if (!check_pac_crc(dst + OFF_PAC1) ||
109 !check_pac_crc(dst + OFF_PAC2) ||
110 !check_pac_crc(dst + OFF_PAC3)) {
111 sr_err("Invalid poll checksum!");
118 SR_PRIV int rdtech_tc_probe(struct sr_serial_dev_inst *serial, struct dev_context *devc)
121 uint8_t poll_pkt[TC_POLL_LEN];
123 if (serial_write_blocking(serial, &POLL_CMD, sizeof(POLL_CMD) - 1,
124 SERIAL_WRITE_TIMEOUT_MS) < 0) {
125 sr_err("Unable to send probe request.");
129 len = serial_read_blocking(serial, devc->buf, TC_POLL_LEN, TC_TIMEOUT_MS);
130 if (len != TC_POLL_LEN) {
131 sr_err("Failed to read probe response.");
135 if (process_poll_pkt(devc, poll_pkt) != SR_OK) {
136 sr_err("Unrecognized TC device!");
140 devc->channels = rdtech_tc_channels;
141 devc->dev_info.model_name = g_strndup((const char *)poll_pkt + OFF_MODEL, LEN_MODEL);
142 devc->dev_info.fw_ver = g_strndup((const char *)poll_pkt + OFF_FW_VER, LEN_FW_VER);
143 devc->dev_info.serial_num = RL32(poll_pkt + OFF_SERIAL);
148 SR_PRIV int rdtech_tc_poll(const struct sr_dev_inst *sdi)
150 struct dev_context *devc = sdi->priv;
151 struct sr_serial_dev_inst *serial = sdi->conn;
153 if (serial_write_blocking(serial, &POLL_CMD, sizeof(POLL_CMD) - 1,
154 SERIAL_WRITE_TIMEOUT_MS) < 0) {
155 sr_err("Unable to send poll request.");
159 devc->cmd_sent_at = g_get_monotonic_time() / 1000;
164 static void handle_poll_data(const struct sr_dev_inst *sdi)
166 struct dev_context *devc = sdi->priv;
167 uint8_t poll_pkt[TC_POLL_LEN];
171 sr_spew("Received poll packet (len: %d).", devc->buflen);
172 if (devc->buflen != TC_POLL_LEN) {
173 sr_err("Unexpected poll packet length: %i", devc->buflen);
177 if (process_poll_pkt(devc, poll_pkt) != SR_OK) {
178 sr_err("Failed to process poll packet.");
182 for (ch = sdi->channels, i = 0; ch; ch = g_slist_next(ch), i++) {
183 bv_send_analog_channel(sdi, ch->data,
184 &devc->channels[i], poll_pkt, TC_POLL_LEN);
187 sr_sw_limits_update_samples_read(&devc->limits, 1);
190 static void recv_poll_data(struct sr_dev_inst *sdi, struct sr_serial_dev_inst *serial)
192 struct dev_context *devc = sdi->priv;
195 /* Serial data arrived. */
196 while (devc->buflen < TC_POLL_LEN) {
197 len = serial_read_nonblocking(serial, devc->buf + devc->buflen, 1);
204 if (devc->buflen == TC_POLL_LEN)
205 handle_poll_data(sdi);
210 SR_PRIV int rdtech_tc_receive_data(int fd, int revents, void *cb_data)
212 struct sr_dev_inst *sdi;
213 struct dev_context *devc;
214 struct sr_serial_dev_inst *serial;
215 int64_t now, elapsed;
219 if (!(sdi = cb_data))
222 if (!(devc = sdi->priv))
226 if (revents == G_IO_IN)
227 recv_poll_data(sdi, serial);
229 if (sr_sw_limits_check(&devc->limits)) {
230 sr_dev_acquisition_stop(sdi);
234 now = g_get_monotonic_time() / 1000;
235 elapsed = now - devc->cmd_sent_at;
237 if (elapsed > TC_POLL_PERIOD_MS)