* This file is part of the libsigrok project.
*
* Copyright (C) 2018 Sven Bursch-Osewold <sb_git@bursch.com>
+ * Copyright (C) 2019 King Kévin <kingkevin@cuvoodoo.info>
*
* 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
#include <config.h>
#include "protocol.h"
-SR_PRIV int zketech_ebd_usb_receive_data(int fd, int revents, void *cb_data)
+/* Log a byte-array as hex values. */
+static void log_buf(const char *message, uint8_t buf[], size_t count)
{
- const struct sr_dev_inst *sdi;
+ char buffer[count * 2 + 1];
+
+ for (size_t j = 0; j < count; j++)
+ sprintf(&buffer[2 * j], "%02X", buf[j]);
+
+ buffer[count * 2] = 0;
+
+ sr_dbg("%s: %s [%zu bytes]", message, buffer, count);
+}
+
+/* Send a command to the device. */
+static int send_cmd(struct sr_serial_dev_inst *serial, uint8_t buf[], size_t count)
+{
+ int ret;
+
+ log_buf("Sending", buf, count);
+ for (size_t byte = 0; byte < count; byte++) {
+ ret = serial_write_blocking(serial, &buf[byte], 1, 0);
+ if (ret < 0) {
+ sr_err("Error sending command: %d.", ret);
+ return ret;
+ }
+ g_usleep(10000); // wait between bytes to prevent data loss at the receiving side
+ }
+
+ return (ret == (int)count) ? SR_OK : SR_ERR;
+}
+
+/* Decode high byte and low byte into a float. */
+static float decode_value(uint8_t hi, uint8_t lo, float divisor)
+{
+ return ((float)hi * 240.0 + (float)lo) / divisor;
+}
+
+/* Encode a float into high byte and low byte. */
+static void encode_value(float current, uint8_t *hi, uint8_t *lo, float divisor)
+{
+ int value;
+
+ value = (int)(current * divisor);
+ sr_dbg("Value %d %d %d", value, value / 240, value % 240);
+ *hi = value / 240;
+ *lo = value % 240;
+}
+
+/* Send updated configuration values to the load. */
+static int send_cfg(struct sr_serial_dev_inst *serial, struct dev_context *devc)
+{
+ uint8_t send[] = { 0xfa, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf8 };
+
+ encode_value(devc->current_limit, &send[2], &send[3], 1000.0);
+ encode_value(devc->voltage_limit, &send[4], &send[5], 100.0);
+
+ send[8] = send[1] ^ send[2] ^ send[3] ^ send[4] ^ send[5] ^ send[6] ^ send[7];
+
+ return send_cmd(serial, send, 10);
+}
+
+/* Send the init/connect sequence; drive starts sending voltage and current. */
+SR_PRIV int ebd_init(struct sr_serial_dev_inst *serial, struct dev_context *devc)
+{
+ uint8_t init[] = { 0xfa, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0xf8 };
+
+ (void)devc;
+
+ int ret = send_cmd(serial, init, 10);
+
+ return ret;
+}
+
+/* Start the load functionality. */
+SR_PRIV int ebd_loadstart(struct sr_serial_dev_inst *serial, struct dev_context *devc)
+{
+ uint8_t start[] = { 0xfa, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xf8 };
+ int ret;
+
+ encode_value(devc->current_limit, &start[2], &start[3], 1000.0);
+ encode_value(devc->voltage_limit, &start[4], &start[5], 100.0);
+
+ start[8] = start[1] ^ start[2] ^ start[3] ^ start[4] ^ start[5] ^ start[6] ^ start[7];
+
+ sr_info("Activating load");
+ ret = send_cmd(serial, start, 10);
+ if (ret)
+ return ret;
+
+ sr_dbg("current limit: %.03f", devc->current_limit);
+ sr_dbg("under-voltage threshold: %.02f", devc->voltage_limit);
+ if (ebd_current_is0(devc))
+ return SR_OK;
+
+ return ret;
+}
+
+/* Toggle the load functionality. */
+SR_PRIV int ebd_loadtoggle(struct sr_serial_dev_inst *serial, struct dev_context *devc)
+{
+ int ret;
+ uint8_t toggle[] = { 0xfa, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xF8 };
+
+ (void) devc;
+
+ sr_info("Toggling load");
+ ret = send_cmd(serial, toggle, 10);
+
+ return ret;
+}
+
+/* Stop the drive. */
+SR_PRIV int ebd_stop(struct sr_serial_dev_inst *serial, struct dev_context *devc)
+{
+ uint8_t stop[] = { 0xfa, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, 0xF8 };
+ int ret;
+
+ (void) devc;
+
+ ret = send_cmd(serial, stop, 10);
+
+ return ret;
+}
+
+/** Receive a complete message
+ * @param[in] serial Serial port from which to read the packet
+ * @param[in] length Buffer length
+ * @param[out] buf Buffer to write packet to
+ * @return packet length (0 = timeout, -1 = error)
+ */
+SR_PRIV int ebd_read_message(struct sr_serial_dev_inst *serial, int length, uint8_t *buf)
+{
+ // check parameters
+ if (NULL == serial) {
+ sr_err("Serial device to receive packet missing.");
+ return -1;
+ }
+ if (length < 3) {
+ sr_err("Packet buffer not large enough.");
+ return -1;
+ }
+ if (NULL == buf) {
+ sr_err("Packet buffer missing.");
+ return -1;
+ }
+
+ int ret;
+ gboolean message_complete = FALSE;
+ int message_length = 0;
+ unsigned int turn = 0;
+ const unsigned int TURNS = 200;
+ buf[message_length] = 0;
+ // try to read data
+ while (!message_complete && turn < TURNS) {
+ // wait for header byte
+ message_length = 0;
+ while (MSG_FRAME_BEGIN != buf[0] && turn < TURNS) {
+ ret = serial_read_blocking(serial, &buf[0], 1, serial_timeout(serial, 1));
+ if (ret < 0) {
+ sr_err("Error %d reading byte.", ret);
+ return ret;
+ } else if (1 == ret) {
+ if (MSG_FRAME_BEGIN != buf[message_length]) {
+ sr_warn("Not frame begin byte %02x received", buf[message_length]);
+ } else {
+ sr_dbg("Message header received: %02x", buf[message_length]);
+ message_length += ret;
+ }
+ }
+ turn++;
+ }
+ // read until end byte
+ while (MSG_FRAME_END != buf[message_length - 1] && message_length < length && turn < TURNS) {
+ ret = serial_read_blocking(serial, &buf[message_length], 1, serial_timeout(serial, 1));
+ if (ret < 0) {
+ sr_err("Error %d reading byte.", ret);
+ return ret;
+ } else if (1 == ret) {
+ if (MSG_FRAME_BEGIN == buf[message_length]) {
+ sr_warn("Frame begin before end received");
+ message_length = 1;
+ } else {
+ sr_dbg("Message data received: %02x", buf[message_length]);
+ message_length += ret;
+ }
+ }
+ turn++;
+ }
+ // verify frame
+ if (turn < TURNS) {
+ if (MSG_FRAME_END == buf[message_length - 1]) {
+ message_complete = TRUE;
+ sr_dbg("Message end received");
+ } else {
+ sr_warn("Frame end not received");
+ }
+ } else {
+ sr_warn("Invalid data and timeout");
+ }
+ }
+
+ if (message_complete && message_length > 2) {
+ ret = message_length;
+ } else if (turn >= TURNS) {
+ ret = 0;
+ } else {
+ ret = -1;
+ }
+ return ret;
+}
+
+static void ebd_send_value(const struct sr_dev_inst *sdi, struct sr_channel *ch,
+ float value, enum sr_mq mq, enum sr_unit unit, int digits)
+{
+ struct sr_datafeed_packet packet;
+ struct sr_datafeed_analog analog;
+ struct sr_analog_encoding encoding;
+ struct sr_analog_meaning meaning;
+ struct sr_analog_spec spec;
+
+ sr_analog_init(&analog, &encoding, &meaning, &spec, digits);
+ analog.meaning->channels = g_slist_append(NULL, ch);
+ analog.num_samples = 1;
+ analog.data = &value;
+ analog.meaning->mq = mq;
+ analog.meaning->unit = unit;
+ analog.meaning->mqflags = SR_MQFLAG_DC;
+
+ packet.type = SR_DF_ANALOG;
+ packet.payload = &analog;
+ sr_session_send(sdi, &packet);
+ g_slist_free(analog.meaning->channels);
+}
+
+SR_PRIV int ebd_receive_data(int fd, int revents, void *cb_data)
+{
+ struct sr_dev_inst *sdi;
struct dev_context *devc;
+ struct sr_serial_dev_inst *serial;
+ struct sr_datafeed_packet packet;
+ struct sr_datafeed_analog analog;
+ struct sr_analog_encoding encoding;
+ struct sr_analog_meaning meaning;
+ struct sr_analog_spec spec;
+ float voltage, voltage_dp, voltage_dm, current, current_limit, voltage_limit;
+ (void)revents;
(void)fd;
if (!(sdi = cb_data))
- return TRUE;
+ return FALSE;
if (!(devc = sdi->priv))
- return TRUE;
+ return FALSE;
- if (revents == G_IO_IN) {
- /* TODO */
+ serial = sdi->conn;
+ current_limit = devc->current_limit;
+ voltage_limit = devc->voltage_limit;
+
+ uint8_t reply[MSG_MAX_LEN];
+ int ret = ebd_read_message(serial, MSG_MAX_LEN, reply);
+
+ /* Tests for correct message. */
+ if (-1 == ret) {
+ sr_err("Can't receive messages");
+ return SR_ERR;
+ } else if (0 == ret) {
+ sr_err("No messages received");
+ devc->running = FALSE;
+ return 0;
+ } else if (ret != 19 || (reply[1] != 0x00 && reply[1] != 0x0a && reply[1] != 0x64 && reply[1] != 0x6e)) {
+ sr_info("Not measurement message received");
+ return ret;
+ }
+
+ /* Verify checksum */
+ uint8_t checksum = 0;
+ for (int i = 1; i < ret - 1; i++) {
+ checksum ^= reply[i];
+ }
+ if (0 != checksum) {
+ sr_warn("Invalid checksum");
+ return ret; /* Don't exit on wrong checksum, the device can recover */
+ }
+
+ devc->running = TRUE;
+ if (0x00 == reply[1] || 0x64 == reply[1]) {
+ devc->load_activated = FALSE;
+ } else if (0x0a == reply[1] || 0x6e == reply[1]) {
+ devc->load_activated = TRUE;
+ }
+
+ /* Calculate values. */
+ current = decode_value(reply[2], reply[3], 10000.0);
+ voltage = decode_value(reply[4], reply[5], 1000.0);
+ voltage_dp = decode_value(reply[6], reply[7], 1000.0);
+ voltage_dm = decode_value(reply[8], reply[9], 1000.0);
+ if (0x0a == reply[1]) {
+ current_limit = decode_value(reply[10], reply[11], 1000.0);
+ voltage_limit = decode_value(reply[12], reply[13], 100.0);
}
+ sr_dbg("VBUS current %.04f A", current);
+ sr_dbg("VBUS voltage %.03f V", voltage);
+ sr_dbg("D+ voltage %.03f V", voltage_dp);
+ sr_dbg("D- voltage %.03f V", voltage_dm);
+ if (0x0a == reply[1]) {
+ sr_dbg("Current limit %.03f A", current_limit);
+ sr_dbg("Voltage limit %.03f A", voltage_limit);
+ }
+
+ // update load state
+ if (devc->load_activated && ebd_current_is0(devc)) {
+ ebd_loadtoggle(serial, devc);
+ } else if (!devc->load_activated && !ebd_current_is0(devc)) {
+ ebd_loadstart(serial, devc);
+ } else if (devc->load_activated && (current_limit != devc->current_limit || voltage_limit != devc->voltage_limit)) {
+ sr_dbg("Adjusting limit from %.03f A %.03f V to %.03f A %.03f V", current_limit, voltage_limit, devc->current_limit, devc->voltage_limit);
+ send_cfg(serial, devc);
+ }
+
+ /* Begin frame. */
+ std_session_send_df_frame_begin(sdi);
+
+ sr_analog_init(&analog, &encoding, &meaning, &spec, 4);
+
+ packet.type = SR_DF_ANALOG;
+ packet.payload = &analog;
+ analog.num_samples = 1;
+
+ /* Values */
+ ebd_send_value(sdi, sdi->channels->data, current,
+ SR_MQ_VOLTAGE, SR_UNIT_VOLT, 3);
+ ebd_send_value(sdi, sdi->channels->next->data, voltage,
+ SR_MQ_CURRENT, SR_UNIT_AMPERE, 4);
+ ebd_send_value(sdi, sdi->channels->next->next->data, voltage_dp,
+ SR_MQ_VOLTAGE, SR_UNIT_VOLT, 3);
+ ebd_send_value(sdi, sdi->channels->next->next->next->data, voltage_dm,
+ SR_MQ_VOLTAGE, SR_UNIT_VOLT, 3);
+
+ /* End frame. */
+ std_session_send_df_frame_end(sdi);
+
+ sr_sw_limits_update_samples_read(&devc->limits, 1);
+ if (sr_sw_limits_check(&devc->limits))
+ sr_dev_acquisition_stop(sdi);
+
return TRUE;
}
+
+SR_PRIV int ebd_get_current_limit(const struct sr_dev_inst *sdi, float *current)
+{
+ struct dev_context *devc;
+
+ if (!(devc = sdi->priv))
+ return SR_ERR;
+
+ g_mutex_lock(&devc->rw_mutex);
+ *current = devc->current_limit;
+ g_mutex_unlock(&devc->rw_mutex);
+
+ return SR_OK;
+}
+
+SR_PRIV int ebd_set_current_limit(const struct sr_dev_inst *sdi, float current)
+{
+ struct dev_context *devc;
+ int ret;
+
+ if (!(devc = sdi->priv))
+ return SR_ERR;
+
+ g_mutex_lock(&devc->rw_mutex);
+ devc->current_limit = current;
+
+ if (!devc->running) {
+ sr_dbg("Setting current limit later.");
+ g_mutex_unlock(&devc->rw_mutex);
+ return SR_OK;
+ }
+
+ sr_dbg("Setting current limit to %fV.", current);
+
+ if (devc->load_activated) {
+ if (ebd_current_is0(devc)) {
+ /* Stop load. */
+ ret = ebd_loadtoggle(sdi->conn, devc);
+ } else {
+ /* Send new current. */
+ ret = send_cfg(sdi->conn, devc);
+ }
+ } else {
+ if (ebd_current_is0(devc)) {
+ /* Nothing to do. */
+ ret = SR_OK;
+ } else {
+ /* Start load. */
+ ret = ebd_loadstart(sdi->conn, devc);
+ }
+ }
+
+ g_mutex_unlock(&devc->rw_mutex);
+
+ return ret;
+}
+
+SR_PRIV int ebd_get_voltage_limit(const struct sr_dev_inst *sdi, float *voltage)
+{
+ struct dev_context *devc;
+
+ if (!(devc = sdi->priv))
+ return SR_ERR;
+
+ g_mutex_lock(&devc->rw_mutex);
+ *voltage = devc->voltage_limit;
+ g_mutex_unlock(&devc->rw_mutex);
+
+ return SR_OK;
+}
+
+SR_PRIV int ebd_set_voltage_limit(const struct sr_dev_inst *sdi, float voltage)
+{
+ struct dev_context *devc;
+ int ret;
+
+ if (!(devc = sdi->priv))
+ return SR_ERR;
+
+ g_mutex_lock(&devc->rw_mutex);
+ devc->voltage_limit = voltage;
+
+ if (!devc->running) {
+ sr_dbg("Setting voltage limit later.");
+ g_mutex_unlock(&devc->rw_mutex);
+ return SR_OK;
+ }
+
+ sr_dbg("Setting voltage limit to %fV.", voltage);
+
+ if (devc->load_activated) {
+ if (ebd_current_is0(devc)) {
+ /* Stop load. */
+ ret = ebd_loadtoggle(sdi->conn, devc);
+ } else {
+ /* Send new current. */
+ ret = send_cfg(sdi->conn, devc);
+ }
+ } else {
+ if (ebd_current_is0(devc)) {
+ /* Nothing to do. */
+ ret = SR_OK;
+ } else {
+ /* Start load. */
+ ret = ebd_loadstart(sdi->conn, devc);
+ }
+ }
+
+ g_mutex_unlock(&devc->rw_mutex);
+
+ return ret;
+}
+
+SR_PRIV gboolean ebd_current_is0(struct dev_context *devc)
+{
+ return devc->current_limit < 0.001;
+}
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