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Diffstat (limited to 'apps/hott_telemetry/messages.c')
-rw-r--r-- | apps/hott_telemetry/messages.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/apps/hott_telemetry/messages.c b/apps/hott_telemetry/messages.c new file mode 100644 index 000000000..8bfb99773 --- /dev/null +++ b/apps/hott_telemetry/messages.c @@ -0,0 +1,87 @@ +/**************************************************************************** + * + * Copyright (C) 2012 PX4 Development Team. All rights reserved. + * Author: @author Simon Wilks <sjwilks@gmail.com> + * + * 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 messages.c + * + */ + +#include "messages.h" + +#include <string.h> +#include <systemlib/systemlib.h> +#include <unistd.h> +#include <uORB/topics/battery_status.h> +#include <uORB/topics/sensor_combined.h> + +static int battery_sub = -1; +static int sensor_sub = -1; + +void messages_init(void) +{ + battery_sub = orb_subscribe(ORB_ID(battery_status)); + sensor_sub = orb_subscribe(ORB_ID(sensor_combined)); +} + +void build_eam_response(uint8_t *buffer, int *size) +{ + /* 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); + + struct eam_module_msg msg; + *size = sizeof(msg); + memset(&msg, 0, *size); + + msg.start = START_BYTE; + msg.eam_sensor_id = ELECTRIC_AIR_MODULE; + msg.sensor_id = EAM_SENSOR_ID; + msg.temperature1 = (uint8_t)(raw.baro_temp_celcius + 20); + msg.temperature2 = TEMP_ZERO_CELSIUS; + msg.main_voltage_L = (uint8_t)(battery.voltage_v * 10); + + uint16_t alt = (uint16_t)(raw.baro_alt_meter + 500); + msg.altitude_L = (uint8_t)alt & 0xff; + msg.altitude_H = (uint8_t)(alt >> 8) & 0xff; + + msg.stop = STOP_BYTE; + + memcpy(buffer, &msg, *size); +}
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