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/*
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <AP_Common/AP_Common.h>
#include <AP_HAL/AP_HAL.h>
#include <AP_HAL/utility/sparse-endian.h>
#include <AP_Math/crc.h>
#include "AP_Proximity_LightWareSF40C.h"
extern const AP_HAL::HAL& hal;
#define PROXIMITY_SF40C_HEADER 0xAA
#define PROXIMITY_SF40C_DESIRED_OUTPUT_RATE 3
// update the state of the sensor
void AP_Proximity_LightWareSF40C::update(void)
{
if (_uart == nullptr) {
return;
}
// initialise sensor if necessary
initialise();
// process incoming messages
process_replies();
// check for timeout and set health status
if ((_last_distance_received_ms == 0) || ((AP_HAL::millis() - _last_distance_received_ms) > PROXIMITY_SF40C_TIMEOUT_MS)) {
set_status(AP_Proximity::Status::NoData);
} else {
set_status(AP_Proximity::Status::Good);
}
}
// initialise sensor
void AP_Proximity_LightWareSF40C::initialise()
{
// initialise boundary
init_boundary();
// exit immediately if we've sent initialisation requests in the last second
uint32_t now_ms = AP_HAL::millis();
if ((now_ms - _last_request_ms) < 1000) {
return;
}
_last_request_ms = now_ms;
// re-fetch motor state
request_motor_state();
// get token from sensor (required for reseting)
if (!got_token()) {
request_token();
return;
}
// if no replies in last 15 seconds reboot sensor
if ((now_ms > 30000) && (now_ms - _last_reply_ms > 15000)) {
restart_sensor();
return;
}
// if motor is starting up give more time to succeed or fail
if ((_sensor_state.motor_state != MotorState::RUNNING_NORMALLY) &&
(_sensor_state.motor_state != MotorState::FAILED_TO_COMMUNICATE)) {
return;
}
// if motor fails, reset sensor and re-try everything
if (_sensor_state.motor_state == MotorState::FAILED_TO_COMMUNICATE) {
restart_sensor();
return;
}
// motor is running correctly (motor_state is RUNNING_NORMALLY) so request start of streaming
if (!_sensor_state.streaming || (_sensor_state.output_rate != PROXIMITY_SF40C_DESIRED_OUTPUT_RATE)) {
request_stream_start();
return;
}
}
// restart sensor and re-init our state
void AP_Proximity_LightWareSF40C::restart_sensor()
{
// return immediately if no token or a restart has been requested within the last 30sec
uint32_t now_ms = AP_HAL::millis();
if ((_last_restart_ms != 0) && ((now_ms - _last_restart_ms) < 30000)) {
return;
}
// restart sensor and re-initialise sensor state
request_reset();
clear_token();
_last_restart_ms = now_ms;
_sensor_state.motor_state = MotorState::UNKNOWN;
_sensor_state.streaming = false;
_sensor_state.output_rate = 0;
}
// send message to sensor
void AP_Proximity_LightWareSF40C::send_message(MessageID msgid, bool write, const uint8_t *payload, uint16_t payload_len)
{
if ((_uart == nullptr) || (payload_len > PROXIMITY_SF40C_PAYLOAD_LEN_MAX)) {
return;
}
// check for sufficient space in outgoing buffer
if (_uart->txspace() < payload_len + 6U) {
return;
}
// write header
_uart->write((uint8_t)PROXIMITY_SF40C_HEADER);
uint16_t crc = crc_xmodem_update(0, PROXIMITY_SF40C_HEADER);
// write flags including payload length
const uint16_t flags = ((payload_len+1) << 6) | (write ? 0x01 : 0);
_uart->write(LOWBYTE(flags));
crc = crc_xmodem_update(crc, LOWBYTE(flags));
_uart->write(HIGHBYTE(flags));
crc = crc_xmodem_update(crc, HIGHBYTE(flags));
// msgid
_uart->write((uint8_t)msgid);
crc = crc_xmodem_update(crc, (uint8_t)msgid);
// payload
if ((payload_len > 0) && (payload != nullptr)) {
for (uint16_t i = 0; i < payload_len; i++) {
_uart->write(payload[i]);
crc = crc_xmodem_update(crc, payload[i]);
}
}
// checksum
_uart->write(LOWBYTE(crc));
_uart->write(HIGHBYTE(crc));
}
// request motor state
void AP_Proximity_LightWareSF40C::request_motor_state()
{
send_message(MessageID::MOTOR_STATE, false, (const uint8_t *)nullptr, 0);
}
// request start of streaming of distances
void AP_Proximity_LightWareSF40C::request_stream_start()
{
// request output rate
const uint8_t desired_rate = PROXIMITY_SF40C_DESIRED_OUTPUT_RATE; // 0 = 20010, 1 = 10005, 2 = 6670, 3 = 2001
send_message(MessageID::OUTPUT_RATE, true, &desired_rate, sizeof(desired_rate));
// request streaming to start
const le32_t val = htole32(3);
send_message(MessageID::STREAM, true, (const uint8_t*)&val, sizeof(val));
}
// request token of sensor
void AP_Proximity_LightWareSF40C::request_token()
{
// request token
send_message(MessageID::TOKEN, false, nullptr, 0);
}
// request reset of sensor
void AP_Proximity_LightWareSF40C::request_reset()
{
// send reset request
send_message(MessageID::RESET, true, _sensor_state.token, ARRAY_SIZE(_sensor_state.token));
}
// check for replies from sensor
void AP_Proximity_LightWareSF40C::process_replies()
{
if (_uart == nullptr) {
return;
}
int16_t nbytes = _uart->available();
while (nbytes-- > 0) {
const int16_t r = _uart->read();
if ((r < 0) || (r > 0xFF)) {
continue;
}
parse_byte((uint8_t)r);
}
}
// process one byte received on serial port
// state is stored in _msg structure
void AP_Proximity_LightWareSF40C::parse_byte(uint8_t b)
{
// check that payload buffer is large enough
static_assert(ARRAY_SIZE(_msg.payload) == PROXIMITY_SF40C_PAYLOAD_LEN_MAX, "AP_Proximity_LightwareSF40C: check _msg.payload array size ");
// process byte depending upon current state
switch (_msg.state) {
case ParseState::HEADER:
if (b == PROXIMITY_SF40C_HEADER) {
_msg.crc_expected = crc_xmodem_update(0, b);
_msg.state = ParseState::FLAGS_L;
}
break;
case ParseState::FLAGS_L:
_msg.flags_low = b;
_msg.crc_expected = crc_xmodem_update(_msg.crc_expected, b);
_msg.state = ParseState::FLAGS_H;
break;
case ParseState::FLAGS_H:
_msg.flags_high = b;
_msg.crc_expected = crc_xmodem_update(_msg.crc_expected, b);
_msg.payload_len = UINT16_VALUE(_msg.flags_high, _msg.flags_low) >> 6;
if ((_msg.payload_len == 0) || (_msg.payload_len > PROXIMITY_SF40C_PAYLOAD_LEN_MAX)) {
// invalid payload length, abandon message
_msg.state = ParseState::HEADER;
} else {
_msg.state = ParseState::MSG_ID;
}
break;
case ParseState::MSG_ID:
_msg.msgid = (MessageID)b;
_msg.crc_expected = crc_xmodem_update(_msg.crc_expected, b);
if (_msg.payload_len > 1) {
_msg.state = ParseState::PAYLOAD;
} else {
_msg.state = ParseState::CRC_L;
}
_msg.payload_recv = 0;
break;
case ParseState::PAYLOAD:
if (_msg.payload_recv < (_msg.payload_len - 1)) {
_msg.payload[_msg.payload_recv] = b;
_msg.payload_recv++;
_msg.crc_expected = crc_xmodem_update(_msg.crc_expected, b);
}
if (_msg.payload_recv >= (_msg.payload_len - 1)) {
_msg.state = ParseState::CRC_L;
}
break;
case ParseState::CRC_L:
_msg.crc_low = b;
_msg.state = ParseState::CRC_H;
break;
case ParseState::CRC_H:
_msg.crc_high = b;
if (_msg.crc_expected == UINT16_VALUE(_msg.crc_high, _msg.crc_low)) {
process_message();
_last_reply_ms = AP_HAL::millis();
}
_msg.state = ParseState::HEADER;
break;
}
}
// process the latest message held in the _msg structure
void AP_Proximity_LightWareSF40C::process_message()
{
// process payload
switch (_msg.msgid) {
case MessageID::TOKEN:
// copy token into _sensor_state.token variable
if (_msg.payload_recv == ARRAY_SIZE(_sensor_state.token)) {
memcpy(_sensor_state.token, _msg.payload, ARRAY_SIZE(_sensor_state.token));
}
break;
case MessageID::RESET:
// no need to do anything
break;
case MessageID::STREAM:
if (_msg.payload_recv == sizeof(uint32_t)) {
_sensor_state.streaming = (buff_to_uint32(_msg.payload[0], _msg.payload[1], _msg.payload[2], _msg.payload[3]) == 3);
}
break;
case MessageID::DISTANCE_OUTPUT: {
_last_distance_received_ms = AP_HAL::millis();
const uint16_t point_total = buff_to_uint16(_msg.payload[8], _msg.payload[9]);
const uint16_t point_count = buff_to_uint16(_msg.payload[10], _msg.payload[11]);
const uint16_t point_start_index = buff_to_uint16(_msg.payload[12], _msg.payload[13]);
// sanity check point_total
if (point_total == 0) {
break;
}
// prepare to push to object database
Vector3f current_pos;
Matrix3f body_to_ned;
const bool database_ready = database_prepare_for_push(current_pos, body_to_ned);
// process each point
const float angle_inc_deg = (1.0f / point_total) * 360.0f;
const float angle_sign = (frontend.get_orientation(state.instance) == 1) ? -1.0f : 1.0f;
const float angle_correction = frontend.get_yaw_correction(state.instance);
const uint16_t dist_min_cm = distance_min() * 100;
const uint16_t dist_max_cm = distance_max() * 100;
// mini sectors are used to combine several readings together
uint8_t combined_count = 0;
float combined_angle_deg = 0;
float combined_dist_m = INT16_MAX;
for (uint16_t i = 0; i < point_count; i++) {
const uint16_t idx = 14 + (i * 2);
const int16_t dist_cm = (int16_t)buff_to_uint16(_msg.payload[idx], _msg.payload[idx+1]);
const float angle_deg = wrap_360((point_start_index + i) * angle_inc_deg * angle_sign + angle_correction);
const uint8_t sector = convert_angle_to_sector(angle_deg);
// if we've entered a new sector then finish off previous sector
if (sector != _last_sector) {
// update boundary used for avoidance
if (_last_sector != UINT8_MAX) {
update_boundary_for_sector(_last_sector, false);
}
// init for new sector
_last_sector = sector;
_distance[sector] = INT16_MAX;
_distance_valid[sector] = false;
}
// check reading is not within an ignore zone
if (!ignore_reading(angle_deg)) {
// check distance reading is valid
if ((dist_cm >= dist_min_cm) && (dist_cm <= dist_max_cm)) {
const float dist_m = dist_cm * 0.01f;
// update shortest distance for this sector
if (dist_m < _distance[sector]) {
_angle[sector] = angle_deg;
_distance[sector] = dist_m;
_distance_valid[sector] = true;
}
// calculate shortest of last few readings
if (dist_m < combined_dist_m) {
combined_dist_m = dist_m;
combined_angle_deg = angle_deg;
}
combined_count++;
}
}
// send combined distance to object database
if ((i+1 >= point_count) || (combined_count >= PROXIMITY_SF40C_COMBINE_READINGS)) {
if ((combined_dist_m < INT16_MAX) && database_ready) {
database_push(combined_angle_deg, combined_dist_m, _last_distance_received_ms, current_pos,body_to_ned);
}
combined_count = 0;
combined_dist_m = INT16_MAX;
}
}
break;
}
case MessageID::MOTOR_STATE:
if (_msg.payload_recv == 1) {
_sensor_state.motor_state = (MotorState)_msg.payload[0];
}
break;
case MessageID::OUTPUT_RATE:
if (_msg.payload_recv == 1) {
_sensor_state.output_rate = _msg.payload[0];
}
break;
// unsupported messages
case MessageID::PRODUCT_NAME:
case MessageID::HARDWARE_VERSION:
case MessageID::FIRMWARE_VERSION:
case MessageID::SERIAL_NUMBER:
case MessageID::TEXT_MESSAGE:
case MessageID::USER_DATA:
case MessageID::SAVE_PARAMETERS:
case MessageID::STAGE_FIRMWARE:
case MessageID::COMMIT_FIRMWARE:
case MessageID::INCOMING_VOLTAGE:
case MessageID::LASER_FIRING:
case MessageID::TEMPERATURE:
case MessageID::BAUD_RATE:
case MessageID::DISTANCE:
case MessageID::MOTOR_VOLTAGE:
case MessageID::FORWARD_OFFSET:
case MessageID::REVOLUTIONS:
case MessageID::ALARM_STATE:
case MessageID::ALARM1:
case MessageID::ALARM2:
case MessageID::ALARM3:
case MessageID::ALARM4:
case MessageID::ALARM5:
case MessageID::ALARM6:
case MessageID::ALARM7:
break;
}
}
// convert buffer to uint32, uint16
uint32_t AP_Proximity_LightWareSF40C::buff_to_uint32(uint8_t b0, uint8_t b1, uint8_t b2, uint8_t b3) const
{
uint32_t leval = (uint32_t)b0 | (uint32_t)b1 << 8 | (uint32_t)b2 << 16 | (uint32_t)b3 << 24;
return leval;
}
uint16_t AP_Proximity_LightWareSF40C::buff_to_uint16(uint8_t b0, uint8_t b1) const
{
uint16_t leval = (uint16_t)b0 | (uint16_t)b1 << 8;
return leval;
}
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