2 * This file is part of the libsigrok project.
4 * Copyright (C) 2018-2020 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/>.
23 #include <libsigrok/libsigrok.h>
28 #include "libsigrok-internal.h"
31 /* Read/write timeouts, poll request intervals. */
32 #define PROBE_TO_MS 1000
34 #define POLL_PERIOD_MS 100
36 /* Expected receive data size for poll responses. */
37 #define POLL_RECV_LEN 130
39 /* Command code to request another poll response. */
40 #define UM_CMD_POLL 0xf0
42 static const struct binary_analog_channel rdtech_default_channels[] = {
43 { "V", { 2, BVT_BE_UINT16, 0.01, }, 2, SR_MQ_VOLTAGE, SR_UNIT_VOLT },
44 { "I", { 4, BVT_BE_UINT16, 0.001, }, 3, SR_MQ_CURRENT, SR_UNIT_AMPERE },
45 { "D+", { 96, BVT_BE_UINT16, 0.01, }, 2, SR_MQ_VOLTAGE, SR_UNIT_VOLT },
46 { "D-", { 98, BVT_BE_UINT16, 0.01, }, 2, SR_MQ_VOLTAGE, SR_UNIT_VOLT },
47 { "T", { 10, BVT_BE_UINT16, 1.0, }, 0, SR_MQ_TEMPERATURE, SR_UNIT_CELSIUS },
48 /* Threshold-based recording (mWh) */
49 { "E", { 106, BVT_BE_UINT32, 0.001, }, 3, SR_MQ_ENERGY, SR_UNIT_WATT_HOUR },
53 static const struct binary_analog_channel rdtech_um25c_channels[] = {
54 { "V", { 2, BVT_BE_UINT16, 0.001, }, 3, SR_MQ_VOLTAGE, SR_UNIT_VOLT },
55 { "I", { 4, BVT_BE_UINT16, 0.0001, }, 4, SR_MQ_CURRENT, SR_UNIT_AMPERE },
56 { "D+", { 96, BVT_BE_UINT16, 0.01, }, 2, SR_MQ_VOLTAGE, SR_UNIT_VOLT },
57 { "D-", { 98, BVT_BE_UINT16, 0.01, }, 2, SR_MQ_VOLTAGE, SR_UNIT_VOLT },
58 { "T", { 10, BVT_BE_UINT16, 1.0, }, 0, SR_MQ_TEMPERATURE, SR_UNIT_CELSIUS },
59 /* Threshold-based recording (mWh) */
60 { "E", { 106, BVT_BE_UINT32, 0.001, }, 3, SR_MQ_ENERGY, SR_UNIT_WATT_HOUR },
64 static gboolean csum_ok_fff1(const uint8_t *buf, size_t len)
68 if (len != POLL_RECV_LEN)
71 csum_recv = read_u16be(&buf[len - sizeof(uint16_t)]);
72 if (csum_recv != 0xfff1)
78 static gboolean csum_ok_um34c(const uint8_t *buf, size_t len)
80 static const int positions[] = {
81 1, 3, 7, 9, 15, 17, 19, 23, 31, 39, 41, 45, 49, 53,
82 55, 57, 59, 63, 67, 69, 73, 79, 83, 89, 97, 99, 109,
83 111, 113, 119, 121, 127,
87 uint8_t csum_calc, csum_recv;
89 if (len != POLL_RECV_LEN)
93 for (i = 0; i < ARRAY_SIZE(positions); i++)
94 csum_calc ^= buf[positions[i]];
95 csum_recv = read_u8(&buf[len - sizeof(uint8_t)]);
96 if (csum_recv != csum_calc)
102 static const struct rdtech_um_profile um_profiles[] = {
103 { "UM24C", RDTECH_UM24C, rdtech_default_channels, csum_ok_fff1, },
104 { "UM25C", RDTECH_UM25C, rdtech_um25c_channels, csum_ok_fff1, },
105 { "UM34C", RDTECH_UM34C, rdtech_default_channels, csum_ok_um34c, },
108 static const struct rdtech_um_profile *find_profile(uint16_t id)
111 const struct rdtech_um_profile *profile;
113 for (i = 0; i < ARRAY_SIZE(um_profiles); i++) {
114 profile = &um_profiles[i];
115 if (profile->model_id == id)
121 SR_PRIV const struct rdtech_um_profile *rdtech_um_probe(struct sr_serial_dev_inst *serial)
123 const struct rdtech_um_profile *p;
126 uint8_t buf[RDTECH_UM_BUFSIZE];
131 ret = serial_write_blocking(serial, &req, sizeof(req), WRITE_TO_MS);
133 sr_err("Failed to send probe request.");
137 rcvd = serial_read_blocking(serial, buf, POLL_RECV_LEN, PROBE_TO_MS);
138 if (rcvd != POLL_RECV_LEN) {
139 sr_err("Failed to read probe response.");
143 model_id = read_u16be(&buf[0]);
144 p = find_profile(model_id);
146 sr_err("Unrecognized UM device (0x%.4" PRIx16 ").", model_id);
150 if (!p->csum_ok(buf, rcvd)) {
151 sr_err("Probe response fails checksum verification.");
158 SR_PRIV int rdtech_um_poll(const struct sr_dev_inst *sdi, gboolean force)
160 struct dev_context *devc;
161 int64_t now, elapsed;
162 struct sr_serial_dev_inst *serial;
166 /* Check for expired intervals or forced requests. */
168 now = g_get_monotonic_time() / 1000;
169 elapsed = now - devc->cmd_sent_at;
170 if (!force && elapsed < POLL_PERIOD_MS)
173 /* Send another poll request. Update interval only on success. */
176 ret = serial_write_blocking(serial, &req, sizeof(req), WRITE_TO_MS);
178 sr_err("Unable to send poll request.");
181 devc->cmd_sent_at = now;
186 static void handle_poll_data(const struct sr_dev_inst *sdi)
188 struct dev_context *devc;
193 sr_spew("Received poll packet (len: %zu).", devc->buflen);
194 if (devc->buflen != POLL_RECV_LEN) {
195 sr_err("Unexpected poll packet length: %zu", devc->buflen);
200 for (ch = sdi->channels; ch; ch = g_slist_next(ch)) {
201 bv_send_analog_channel(sdi, ch->data,
202 &devc->profile->channels[ch_idx],
203 devc->buf, devc->buflen);
207 sr_sw_limits_update_samples_read(&devc->limits, 1);
210 static void recv_poll_data(struct sr_dev_inst *sdi, struct sr_serial_dev_inst *serial)
212 struct dev_context *devc;
213 const struct rdtech_um_profile *p;
216 /* Serial data arrived. */
219 while (devc->buflen < POLL_RECV_LEN) {
220 len = serial_read_nonblocking(serial, devc->buf + devc->buflen, 1);
225 /* Check if the poll model ID matches the profile. */
226 if (devc->buflen == 2 && RB16(devc->buf) != p->model_id) {
227 sr_warn("Illegal model ID in poll response (0x%.4" PRIx16 "),"
231 memmove(devc->buf, devc->buf + 1, devc->buflen);
235 if (devc->buflen != POLL_RECV_LEN)
236 sr_warn("Skipping packet, unexpected receive length.");
237 else if (!p->csum_ok(devc->buf, devc->buflen))
238 sr_warn("Skipping packet, checksum verification failed.");
240 handle_poll_data(sdi);
244 SR_PRIV int rdtech_um_receive_data(int fd, int revents, void *cb_data)
246 struct sr_dev_inst *sdi;
247 struct dev_context *devc;
248 struct sr_serial_dev_inst *serial;
252 if (!(sdi = cb_data))
254 if (!(devc = sdi->priv))
257 /* Drain and process receive data as it becomes available. */
259 if (revents == G_IO_IN)
260 recv_poll_data(sdi, serial);
262 /* Check configured acquisition limits. */
263 if (sr_sw_limits_check(&devc->limits)) {
264 sr_dev_acquisition_stop(sdi);
268 /* Periodically emit measurement requests. */
269 (void)rdtech_um_poll(sdi, FALSE);