libsigrok/hardware/tondaj-sl-814/protocol.c

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/*
2013-04-23 20:24:30 +00:00
* This file is part of the libsigrok 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"
/* States */
enum {
SEND_INIT,
GET_INIT_REPLY,
SEND_PACKET_REQUEST,
GET_PACKET,
};
static void parse_packet(const uint8_t *buf, float *floatval,
struct sr_datafeed_analog *analog)
{
gboolean is_a, is_fast;
uint16_t intval;
uint8_t level = 0, level_bits;
/* Byte 0 [7:7]: 0 = A, 1 = C */
is_a = ((buf[0] & (1 << 7)) == 0);
/* Byte 0 [6:6]: Unknown/unused? */
/* Byte 0 [5:4]: Level (00 = 40, 01 = 60, 10 = 80, 11 = 100) */
level_bits = (buf[0] >> 4) & 0x03;
if (level_bits == 0)
level = 40;
else if (level_bits == 1)
level = 60;
else if (level_bits == 2)
level = 80;
else if (level_bits == 3)
level = 100;
/* Byte 0 [3:3]: 0 = fast, 1 = slow */
is_fast = ((buf[0] & (1 << 3)) == 0);
/* Byte 0 [2:0]: value[10..8] */
/* Byte 1 [7:0]: value[7..0] */
intval = (buf[0] & 0x7) << 8;
intval |= buf[1];
*floatval = (float)intval;
/* The value on the display always has one digit after the comma. */
*floatval /= 10;
analog->mq = SR_MQ_SOUND_PRESSURE_LEVEL;
analog->unit = SR_UNIT_DECIBEL_SPL;
if (is_a)
analog->mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_A;
else
analog->mqflags |= SR_MQFLAG_SPL_FREQ_WEIGHT_C;
if (is_fast)
analog->mqflags |= SR_MQFLAG_SPL_TIME_WEIGHT_F;
else
analog->mqflags |= SR_MQFLAG_SPL_TIME_WEIGHT_S;
/* TODO: How to handle level? */
(void)level;
}
static void decode_packet(struct sr_dev_inst *sdi)
{
struct sr_datafeed_packet packet;
struct sr_datafeed_analog analog;
struct dev_context *devc;
float floatval;
devc = sdi->priv;
memset(&analog, 0, sizeof(struct sr_datafeed_analog));
parse_packet(devc->buf, &floatval, &analog);
/* Send a sample packet with one analog value. */
analog.probes = sdi->probes;
analog.num_samples = 1;
analog.data = &floatval;
packet.type = SR_DF_ANALOG;
packet.payload = &analog;
sr_session_send(devc->cb_data, &packet);
devc->num_samples++;
}
int tondaj_sl_814_receive_data(int fd, int revents, void *cb_data)
{
struct sr_dev_inst *sdi;
struct dev_context *devc;
struct sr_serial_dev_inst *serial;
uint8_t buf[3];
int ret;
(void)fd;
(void)revents;
sdi = cb_data;
serial = sdi->conn;
devc = sdi->priv;
/* TODO: Parts of this code need to be improved later. */
/* State machine. */
if (devc->state == SEND_INIT) {
/* On the first run, send the "init" command. */
buf[0] = 0x10;
buf[1] = 0x04;
buf[2] = 0x0d;
sr_spew("Sending init command: %02x %02x %02x.",
buf[0], buf[1], buf[2]);
if ((ret = serial_write(serial, buf, 3)) < 0) {
sr_err("Error sending init command: %d.", ret);
return FALSE;
}
devc->state = GET_INIT_REPLY;
} else if (devc->state == GET_INIT_REPLY) {
/* If we just sent the "init" command, get its reply. */
if ((ret = serial_read(serial, buf, 2)) < 0) {
sr_err("Error reading init reply: %d.", ret);
return FALSE;
}
sr_spew("Received init reply: %02x %02x.", buf[0], buf[1]);
/* Expected reply: 0x05 0x0d */
if (buf[0] != 0x05 || buf[1] != 0x0d) {
sr_err("Received incorrect init reply, retrying.");
devc->state = SEND_INIT;
return TRUE;
}
devc->state = SEND_PACKET_REQUEST;
} else if (devc->state == SEND_PACKET_REQUEST) {
/* Request a packet (send 0x30 ZZ 0x0d). */
buf[0] = 0x30;
buf[1] = 0x00; /* ZZ */
buf[2] = 0x0d;
sr_spew("Sending data request command: %02x %02x %02x.",
buf[0], buf[1], buf[2]);
if ((ret = serial_write(serial, buf, 3)) < 0) {
sr_err("Error sending request command: %d.", ret);
return FALSE;
}
devc->buflen = 0;
devc->state = GET_PACKET;
} else if (devc->state == GET_PACKET) {
/* Read a packet from the device. */
ret = serial_read(serial, devc->buf + devc->buflen,
4 - devc->buflen);
if (ret < 0) {
sr_err("Error reading packet: %d.", ret);
return TRUE;
}
devc->buflen += ret;
/* Didn't receive all 4 bytes, yet. */
if (devc->buflen != 4)
return TRUE;
sr_spew("Received packet: %02x %02x %02x %02x.", devc->buf[0],
devc->buf[1], devc->buf[2], devc->buf[3]);
/* Expected reply: AA BB ZZ+1 0x0d */
if (devc->buf[2] != 0x01 || devc->buf[3] != 0x0d) {
sr_err("Received incorrect request reply, retrying.");
devc->state = SEND_PACKET_REQUEST;
return TRUE;
}
decode_packet(sdi);
devc->state = SEND_PACKET_REQUEST;
} else {
sr_err("Invalid state: %d.", devc->state);
return FALSE;
}
/* Stop 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;
}