diff options
Diffstat (limited to 'src/drivers/frsky_telemetry/frsky_data.c')
| -rw-r--r-- | src/drivers/frsky_telemetry/frsky_data.c | 289 |
1 files changed, 289 insertions, 0 deletions
diff --git a/src/drivers/frsky_telemetry/frsky_data.c b/src/drivers/frsky_telemetry/frsky_data.c new file mode 100644 index 000000000..63b2d2d29 --- /dev/null +++ b/src/drivers/frsky_telemetry/frsky_data.c @@ -0,0 +1,289 @@ +/**************************************************************************** + * + * Copyright (c) 2013-2014 PX4 Development Team. All rights reserved. + * Author: Stefan Rado <px4@sradonia.net> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name PX4 nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/** + * @file frsky_data.c + * @author Stefan Rado <px4@sradonia.net> + * + * FrSky telemetry implementation. + * + */ + +#include "frsky_data.h" + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <arch/math.h> +#include <geo/geo.h> + +#include <uORB/topics/battery_status.h> +#include <uORB/topics/sensor_combined.h> +#include <uORB/topics/vehicle_global_position.h> +#include <uORB/topics/vehicle_status.h> + +/* FrSky sensor hub data IDs */ +#define FRSKY_ID_GPS_ALT_BP 0x01 +#define FRSKY_ID_TEMP1 0x02 +#define FRSKY_ID_RPM 0x03 +#define FRSKY_ID_FUEL 0x04 +#define FRSKY_ID_TEMP2 0x05 +#define FRSKY_ID_VOLTS 0x06 +#define FRSKY_ID_GPS_ALT_AP 0x09 +#define FRSKY_ID_BARO_ALT_BP 0x10 +#define FRSKY_ID_GPS_SPEED_BP 0x11 +#define FRSKY_ID_GPS_LONG_BP 0x12 +#define FRSKY_ID_GPS_LAT_BP 0x13 +#define FRSKY_ID_GPS_COURS_BP 0x14 +#define FRSKY_ID_GPS_DAY_MONTH 0x15 +#define FRSKY_ID_GPS_YEAR 0x16 +#define FRSKY_ID_GPS_HOUR_MIN 0x17 +#define FRSKY_ID_GPS_SEC 0x18 +#define FRSKY_ID_GPS_SPEED_AP 0x19 +#define FRSKY_ID_GPS_LONG_AP 0x1A +#define FRSKY_ID_GPS_LAT_AP 0x1B +#define FRSKY_ID_GPS_COURS_AP 0x1C +#define FRSKY_ID_BARO_ALT_AP 0x21 +#define FRSKY_ID_GPS_LONG_EW 0x22 +#define FRSKY_ID_GPS_LAT_NS 0x23 +#define FRSKY_ID_ACCEL_X 0x24 +#define FRSKY_ID_ACCEL_Y 0x25 +#define FRSKY_ID_ACCEL_Z 0x26 +#define FRSKY_ID_CURRENT 0x28 +#define FRSKY_ID_VARIO 0x30 +#define FRSKY_ID_VFAS 0x39 +#define FRSKY_ID_VOLTS_BP 0x3A +#define FRSKY_ID_VOLTS_AP 0x3B + +#define frac(f) (f - (int)f) + +static int battery_sub = -1; +static int sensor_sub = -1; +static int global_position_sub = -1; +static int vehicle_status_sub = -1; + +/** + * Initializes the uORB subscriptions. + */ +void frsky_init() +{ + battery_sub = orb_subscribe(ORB_ID(battery_status)); + global_position_sub = orb_subscribe(ORB_ID(vehicle_global_position)); + sensor_sub = orb_subscribe(ORB_ID(sensor_combined)); + vehicle_status_sub = orb_subscribe(ORB_ID(vehicle_status)); +} + +/** + * Sends a 0x5E start/stop byte. + */ +static void frsky_send_startstop(int uart) +{ + static const uint8_t c = 0x5E; + write(uart, &c, sizeof(c)); +} + +/** + * Sends one byte, performing byte-stuffing if necessary. + */ +static void frsky_send_byte(int uart, uint8_t value) +{ + const uint8_t x5E[] = { 0x5D, 0x3E }; + const uint8_t x5D[] = { 0x5D, 0x3D }; + + switch (value) { + case 0x5E: + write(uart, x5E, sizeof(x5E)); + break; + + case 0x5D: + write(uart, x5D, sizeof(x5D)); + break; + + default: + write(uart, &value, sizeof(value)); + break; + } +} + +/** + * Sends one data id/value pair. + */ +static void frsky_send_data(int uart, uint8_t id, int16_t data) +{ + /* Cast data to unsigned, because signed shift might behave incorrectly */ + uint16_t udata = data; + + frsky_send_startstop(uart); + + frsky_send_byte(uart, id); + frsky_send_byte(uart, udata); /* LSB */ + frsky_send_byte(uart, udata >> 8); /* MSB */ +} + +/** + * Sends frame 1 (every 200ms): + * acceleration values, barometer altitude, temperature, battery voltage & current + */ +void frsky_send_frame1(int uart) +{ + /* get a local copy of the current sensor values */ + struct sensor_combined_s raw; + memset(&raw, 0, sizeof(raw)); + orb_copy(ORB_ID(sensor_combined), sensor_sub, &raw); + + /* get a local copy of the battery data */ + struct battery_status_s battery; + memset(&battery, 0, sizeof(battery)); + orb_copy(ORB_ID(battery_status), battery_sub, &battery); + + /* send formatted frame */ + frsky_send_data(uart, FRSKY_ID_ACCEL_X, + roundf(raw.accelerometer_m_s2[0] * 1000.0f)); + frsky_send_data(uart, FRSKY_ID_ACCEL_Y, + roundf(raw.accelerometer_m_s2[1] * 1000.0f)); + frsky_send_data(uart, FRSKY_ID_ACCEL_Z, + roundf(raw.accelerometer_m_s2[2] * 1000.0f)); + + frsky_send_data(uart, FRSKY_ID_BARO_ALT_BP, + raw.baro_alt_meter); + frsky_send_data(uart, FRSKY_ID_BARO_ALT_AP, + roundf(frac(raw.baro_alt_meter) * 100.0f)); + + frsky_send_data(uart, FRSKY_ID_TEMP1, + roundf(raw.baro_temp_celcius)); + + frsky_send_data(uart, FRSKY_ID_VFAS, + roundf(battery.voltage_v * 10.0f)); + frsky_send_data(uart, FRSKY_ID_CURRENT, + (battery.current_a < 0) ? 0 : roundf(battery.current_a * 10.0f)); + + frsky_send_startstop(uart); +} + +/** + * Formats the decimal latitude/longitude to the required degrees/minutes/seconds. + */ +static float frsky_format_gps(float dec) +{ + float dms_deg = (int) dec; + float dec_deg = dec - dms_deg; + float dms_min = (int) (dec_deg * 60); + float dec_min = (dec_deg * 60) - dms_min; + float dms_sec = dec_min * 60; + + return (dms_deg * 100.0f) + dms_min + (dms_sec / 100.0f); +} + +/** + * Sends frame 2 (every 1000ms): + * GPS course, latitude, longitude, ground speed, GPS altitude, remaining battery level + */ +void frsky_send_frame2(int uart) +{ + /* get a local copy of the global position data */ + struct vehicle_global_position_s global_pos; + memset(&global_pos, 0, sizeof(global_pos)); + orb_copy(ORB_ID(vehicle_global_position), global_position_sub, &global_pos); + + /* get a local copy of the vehicle status data */ + struct vehicle_status_s vehicle_status; + memset(&vehicle_status, 0, sizeof(vehicle_status)); + orb_copy(ORB_ID(vehicle_status), vehicle_status_sub, &vehicle_status); + + /* send formatted frame */ + float course = 0, lat = 0, lon = 0, speed = 0, alt = 0; + char lat_ns = 0, lon_ew = 0; + int sec = 0; + if (global_pos.valid) { + time_t time_gps = global_pos.time_gps_usec / 1000000; + struct tm *tm_gps = gmtime(&time_gps); + + course = (global_pos.yaw + M_PI_F) / M_PI_F * 180.0f; + lat = frsky_format_gps(abs(global_pos.lat) / 10000000.0f); + lat_ns = (global_pos.lat < 0) ? 'S' : 'N'; + lon = frsky_format_gps(abs(global_pos.lon) / 10000000.0f); + lon_ew = (global_pos.lon < 0) ? 'W' : 'E'; + speed = sqrtf(global_pos.vx * global_pos.vx + global_pos.vy * global_pos.vy) + * 25.0f / 46.0f; + alt = global_pos.alt; + sec = tm_gps->tm_sec; + } + + frsky_send_data(uart, FRSKY_ID_GPS_COURS_BP, course); + frsky_send_data(uart, FRSKY_ID_GPS_COURS_AP, frac(course) * 1000.0f); + + frsky_send_data(uart, FRSKY_ID_GPS_LAT_BP, lat); + frsky_send_data(uart, FRSKY_ID_GPS_LAT_AP, frac(lat) * 10000.0f); + frsky_send_data(uart, FRSKY_ID_GPS_LAT_NS, lat_ns); + + frsky_send_data(uart, FRSKY_ID_GPS_LONG_BP, lon); + frsky_send_data(uart, FRSKY_ID_GPS_LONG_AP, frac(lon) * 10000.0f); + frsky_send_data(uart, FRSKY_ID_GPS_LONG_EW, lon_ew); + + frsky_send_data(uart, FRSKY_ID_GPS_SPEED_BP, speed); + frsky_send_data(uart, FRSKY_ID_GPS_SPEED_AP, frac(speed) * 100.0f); + + frsky_send_data(uart, FRSKY_ID_GPS_ALT_BP, alt); + frsky_send_data(uart, FRSKY_ID_GPS_ALT_AP, frac(alt) * 100.0f); + + frsky_send_data(uart, FRSKY_ID_FUEL, + roundf(vehicle_status.battery_remaining * 100.0f)); + + frsky_send_data(uart, FRSKY_ID_GPS_SEC, sec); + + frsky_send_startstop(uart); +} + +/** + * Sends frame 3 (every 5000ms): + * GPS date & time + */ +void frsky_send_frame3(int uart) +{ + /* get a local copy of the battery data */ + struct vehicle_global_position_s global_pos; + memset(&global_pos, 0, sizeof(global_pos)); + orb_copy(ORB_ID(vehicle_global_position), global_position_sub, &global_pos); + + /* send formatted frame */ + time_t time_gps = global_pos.time_gps_usec / 1000000; + struct tm *tm_gps = gmtime(&time_gps); + uint16_t hour_min = (tm_gps->tm_min << 8) | (tm_gps->tm_hour & 0xff); + frsky_send_data(uart, FRSKY_ID_GPS_DAY_MONTH, tm_gps->tm_mday); + frsky_send_data(uart, FRSKY_ID_GPS_YEAR, tm_gps->tm_year); + frsky_send_data(uart, FRSKY_ID_GPS_HOUR_MIN, hour_min); + frsky_send_data(uart, FRSKY_ID_GPS_SEC, tm_gps->tm_sec); + + frsky_send_startstop(uart); +} |