X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=src%2Fhardware%2Fzketech-ebd-usb%2Fprotocol.c;h=4c586f6fd71989deec056a650a2abf96fb4e29a2;hb=b28e391a755e28568b6e0a8161d55d87e0c5f3cc;hp=f4939761d5c67ab31d1d8cc2f90229b3614b496e;hpb=c527132aec5ff8f2fc9646f360a7b0874301e4e7;p=libsigrok.git

diff --git a/src/hardware/zketech-ebd-usb/protocol.c b/src/hardware/zketech-ebd-usb/protocol.c
index f4939761..4c586f6f 100644
--- a/src/hardware/zketech-ebd-usb/protocol.c
+++ b/src/hardware/zketech-ebd-usb/protocol.c
@@ -20,22 +20,310 @@
 #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);
+	ret = serial_write_blocking(serial, buf, count, 0);
+	if (ret < 0) {
+		sr_err("Error sending command: %d.", ret);
+		return ret;
+	}
+
+	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);
+
+	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);
+	if (ret == SR_OK)
+		devc->running = TRUE;
+
+	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;
+
+	ret = send_cmd(serial, start, 10);
+	if (ret)
+		return ret;
+
+	sr_dbg("Current limit: %f.", devc->current_limit);
+	if (ebd_current_is0(devc))
+		return SR_OK;
+
+	ret = send_cfg(serial, devc);
+	if (ret == SR_OK) {
+		sr_dbg("Load activated.");
+		devc->load_activated = TRUE;
+	}
+
+	return ret;
+}
+
+/* Stop the load functionality. */
+SR_PRIV int ebd_loadstop(struct sr_serial_dev_inst *serial, struct dev_context *devc)
+{
+	int ret;
+	uint8_t stop[] = { 0xfa, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xF8 };
+
+	ret = send_cmd(serial, stop, 10);
+	if (ret == SR_OK)
+		devc->load_activated = FALSE;
+
+	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);
+	if (ret == SR_OK) {
+		devc->load_activated = FALSE;
+		devc->running= FALSE;
+	}
+
+	return ret;
+}
+
+/** Read count bytes from the serial connection. */
+SR_PRIV int ebd_read_chars(struct sr_serial_dev_inst *serial, int count, uint8_t *buf)
+{
+	int ret, received, turns;
+
+	received = 0;
+	turns = 0;
+
+	do {
+		ret = serial_read_blocking(serial, buf + received,
+			count - received, serial_timeout(serial, count));
+		if (ret < 0) {
+			sr_err("Error %d reading %d bytes.", ret, count);
+			return ret;
+		}
+		received += ret;
+		turns++;
+	} while ((received < count) && (turns < 100));
+
+	log_buf("Received", buf, received);
+
+	return received;
+}
+
+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, current, current_limit;
+	GSList *l;
 
+	(void)revents;
 	(void)fd;
 
 	if (!(sdi = cb_data))
-		return TRUE;
+		return FALSE;
 
 	if (!(devc = sdi->priv))
-		return TRUE;
+		return FALSE;
+
+	serial = sdi->conn;
 
-	if (revents == G_IO_IN) {
-		/* TODO */
+	uint8_t reply[MSG_LEN];
+	int ret = ebd_read_chars(serial, MSG_LEN, reply);
+
+	/* Tests for correct message. */
+	if (ret != MSG_LEN) {
+		sr_err("Message invalid [Len].");
+		return (ret < 0) ? ret : SR_ERR;
 	}
 
+	uint8_t xor = reply[1] ^ reply[2] ^ reply[3] ^ reply[4] ^ \
+		      reply[5] ^ reply[6] ^ reply[7] ^ reply[8] ^ \
+		      reply[9] ^ reply[10] ^ reply[11] ^ reply[12] ^ \
+		      reply[13] ^ reply[14] ^ reply[15] ^ reply[16];
+
+	if (reply[MSG_FRAME_BEGIN_POS] != MSG_FRAME_BEGIN || \
+			reply[MSG_FRAME_END_POS] != MSG_FRAME_END || \
+			xor != reply[MSG_CHECKSUM_POS]) {
+		sr_err("Message invalid [XOR, BEGIN/END].");
+		return SR_ERR;
+	}
+
+	/* Calculate values. */
+	sr_dbg("V: %02X %02X A: %02X %02X -- Limit %02X %02X", reply[4],
+		reply[5], reply[2], reply[3], reply[10], reply[11]);
+
+	voltage = decode_value(reply[4], reply[5], 1000.0);
+	current = decode_value(reply[2], reply[3], 10000.0);
+	current_limit = decode_value(reply[10], reply[11], 1000.0);
+
+	sr_dbg("Voltage %f", voltage);
+	sr_dbg("Current %f", current);
+	sr_dbg("Current limit %f", current_limit);
+
+	/* 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;
+
+	/* Voltage */
+	l = g_slist_copy(sdi->channels);
+	l = g_slist_remove_link(l, g_slist_nth(l, 1));
+	meaning.channels = l;
+	meaning.mq = SR_MQ_VOLTAGE;
+	meaning.mqflags = SR_MQFLAG_DC;
+	meaning.unit = SR_UNIT_VOLT;
+	analog.data = &voltage;
+	sr_session_send(sdi, &packet);
+	g_slist_free(l);
+
+	/* Current */
+	l = g_slist_copy(sdi->channels);
+	l = g_slist_remove_link(l, g_slist_nth(l, 0));
+	meaning.channels = l;
+	meaning.mq = SR_MQ_CURRENT;
+	meaning.mqflags = SR_MQFLAG_DC;
+	meaning.unit = SR_UNIT_AMPERE;
+	analog.data = &current;
+	sr_session_send(sdi, &packet);
+	g_slist_free(l);
+
+	/* 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_loadstop(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;
+}