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author | Simon Wilks <sjwilks@gmail.com> | 2013-05-14 23:53:21 +0200 |
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committer | Simon Wilks <sjwilks@gmail.com> | 2013-05-14 23:53:21 +0200 |
commit | 150eabbf3986bd120908506b97ed7d9e9eed1038 (patch) | |
tree | db80c74c644e7a36b0a9f959f55904ebeb95e4cd | |
parent | 5ebd78345cf815689117af73bc7909145ba71e4c (diff) | |
download | px4-firmware-150eabbf3986bd120908506b97ed7d9e9eed1038.tar.gz px4-firmware-150eabbf3986bd120908506b97ed7d9e9eed1038.tar.bz2 px4-firmware-150eabbf3986bd120908506b97ed7d9e9eed1038.zip |
GPS support - mostly working.
-rw-r--r-- | apps/hott_telemetry/hott_telemetry_main.c | 2 | ||||
-rw-r--r-- | apps/hott_telemetry/messages.c | 87 | ||||
-rw-r--r-- | apps/hott_telemetry/messages.h | 4 |
3 files changed, 87 insertions, 6 deletions
diff --git a/apps/hott_telemetry/hott_telemetry_main.c b/apps/hott_telemetry/hott_telemetry_main.c index 33b721962..f419c95de 100644 --- a/apps/hott_telemetry/hott_telemetry_main.c +++ b/apps/hott_telemetry/hott_telemetry_main.c @@ -230,7 +230,7 @@ hott_telemetry_thread_main(int argc, char *argv[]) break; case GPS_SENSOR_ID: - build_eam_response(buffer, &size); + build_gps_response(buffer, &size); break; default: diff --git a/apps/hott_telemetry/messages.c b/apps/hott_telemetry/messages.c index 2e1a5c064..feec8998c 100644 --- a/apps/hott_telemetry/messages.c +++ b/apps/hott_telemetry/messages.c @@ -39,10 +39,12 @@ #include "messages.h" +#include <math.h> #include <string.h> #include <systemlib/systemlib.h> #include <unistd.h> #include <uORB/topics/battery_status.h> +#include <uORB/topics/home_position.h> #include <uORB/topics/sensor_combined.h> #include <uORB/topics/vehicle_gps_position.h> @@ -51,6 +53,7 @@ static int battery_sub = -1; static int gps_sub = -1; +static int home_sub = -1; static int sensor_sub = -1; void @@ -58,6 +61,7 @@ messages_init(void) { battery_sub = orb_subscribe(ORB_ID(battery_status)); gps_sub = orb_subscribe(ORB_ID(vehicle_gps_position)); + home_sub = orb_subscribe(ORB_ID(home_position)); sensor_sub = orb_subscribe(ORB_ID(sensor_combined)); } @@ -115,22 +119,97 @@ build_gps_response(uint8_t *buffer, size_t *size) msg.sensor_id = GPS_SENSOR_ID; msg.sensor_text_id = GPS_SENSOR_TEXT_ID; + /* Current flight direction */ + msg.flight_direction = (uint8_t)(gps.cog_rad * M_RAD_TO_DEG_F); + + /* GPS speed */ uint16_t speed = (uint16_t)(gps.vel_m_s * 3.6); msg.gps_speed_L = (uint8_t)speed & 0xff; msg.gps_speed_H = (uint8_t)(speed >> 8) & 0xff; - uint16_t alt = (uint16_t)(gps.alt); + /* Get latitude in degrees, minutes and seconds */ + double lat = ((double)(gps.lat)) * 1e-7d; + + msg.latitude_ns = 0; + if (lat < 0) { + msg.latitude_ns = 1; + lat = -lat; + } + + int deg; + int min; + int sec; + convert_to_degrees_minutes_seconds(lat, °, &min, &sec); + + uint16_t lat_min = (uint16_t)(deg * 100 + min); + msg.latitude_min_L = (uint8_t)lat_min & 0xff; + msg.latitude_min_H = (uint8_t)(lat_min >> 8) & 0xff; + uint16_t lat_sec = (uint16_t)(sec); + msg.latitude_sec_L = (uint8_t)lat_sec & 0xff; + msg.latitude_sec_H = (uint8_t)(lat_sec >> 8) & 0xff; + + + /* Get longitude in degrees, minutes and seconds */ + double lon = ((double)(gps.lon)) * 1e-7d; + + msg.longitude_ew = 0; + if (lon < 0) { + msg.longitude_ew = 1; + lon = -lon; + } + + convert_to_degrees_minutes_seconds(lon, °, &min, &sec); + + uint16_t lon_min = (uint16_t)(deg * 100 + min); + msg.longitude_min_L = (uint8_t)lon_min & 0xff; + msg.longitude_min_H = (uint8_t)(lon_min >> 8) & 0xff; + uint16_t lon_sec = (uint16_t)(sec); + msg.longitude_sec_L = (uint8_t)lon_sec & 0xff; + msg.longitude_sec_H = (uint8_t)(lon_sec >> 8) & 0xff; + + /* Altitude */ + uint16_t alt = (uint16_t)(gps.alt * 1e-3 + 500.0f); msg.altitude_L = (uint8_t)alt & 0xff; msg.altitude_H = (uint8_t)(alt >> 8) & 0xff; + /* Distance from home */ + bool updated; + orb_check(home_sub, &updated); + if (updated) { + /* get a local copy of the home position data */ + struct home_position_s home = { 0 }; + orb_copy(ORB_ID(home_position), home_sub, &home); + + uint16_t dist = (uint16_t)get_distance_to_next_waypoint( + (double)home.lat*1e-7, (double)home.lon*1e-7, lat, lon); + warnx("dist %d home.lat %3.6f home.lon %3.6f lat %3.6f lon %3.6f ", + dist, (double)home.lat*1e-7d, (double)home.lon*1e-7d, lat, lon); + msg.distance_L = (uint8_t)dist & 0xff; + msg.distance_H = (uint8_t)(dist >> 8) & 0xff; + + /* Direction back to home */ + uint16_t bearing = (uint16_t)get_bearing_to_next_waypoint( + (double)home.lat*1e-7, (double)home.lon*1e-7, lat, lon) * M_RAD_TO_DEG_F; + msg.home_direction = (uint8_t)bearing >> 1; + } + msg.gps_num_sat = gps.satellites_visible; - /* Display the fix type: 0 = none, 2 = 2D, 3 = 3D */ + /* The GPS fix type: 0 = none, 2 = 2D, 3 = 3D */ + msg.gps_fix_char = (uint8_t)(gps.fix_type + 48); msg.gps_fix = (uint8_t)(gps.fix_type + 48); - // TODO(sjwilks): Complete. - msg.stop = STOP_BYTE; memcpy(buffer, &msg, *size); } + +void +convert_to_degrees_minutes_seconds(double val, int *deg, int *min, int *sec) +{ + *deg = (int)val; + + double delta = val - *deg; + *min = (int)(delta * 60.0); + *sec = (int)(delta * 3600.0); +} diff --git a/apps/hott_telemetry/messages.h b/apps/hott_telemetry/messages.h index c83672c08..4ccc1b311 100644 --- a/apps/hott_telemetry/messages.h +++ b/apps/hott_telemetry/messages.h @@ -145,7 +145,7 @@ struct gps_module_msg { uint8_t latitude_sec_H; /**< Byte 14: 016 3 = 0x03 */ uint8_t longitude_ew; /**< Byte 15: 000 = E= 9° 25’9360 */ - uint8_t longitude_min_L; /**< Byte 16: 150 157 = 0x9D = 0x039D = 0925 */ + uint8_t longitude_min_L; /**< Byte 16: 150 157 = 0x9D = 0x039D = 0925 */ uint8_t longitude_min_H; /**< Byte 17: 003 3 = 0x03 */ uint8_t longitude_sec_L; /**< Byte 18: 056 144 = 0x90 0x2490 = 9360*/ uint8_t longitude_sec_H; /**< Byte 19: 004 36 = 0x24 */ @@ -188,5 +188,7 @@ struct gps_module_msg { void messages_init(void); void build_eam_response(uint8_t *buffer, size_t *size); void build_gps_response(uint8_t *buffer, size_t *size); +void convert_to_degrees_minutes_seconds(double lat, int *deg, int *min, int *sec); + #endif /* MESSAGES_H_ */ |