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LibrePilot/flight/Modules/Altitude/altitude.c

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/**
******************************************************************************
* @addtogroup OpenPilotModules OpenPilot Modules
* @{
* @addtogroup AltitudeModule Altitude Module
* @brief Communicate with BMP085 and update @ref BaroAltitude "BaroAltitude UAV Object"
* @{
*
* @file altitude.c
* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
* @brief Altitude module, handles temperature and pressure readings from BMP085
*
* @see The GNU Public License (GPL) Version 3
*
*****************************************************************************/
/*
* 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, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**
* Output object: BaroAltitude
*
* This module will periodically update the value of the BaroAltitude object.
*
*/
#include "openpilot.h"
#include "hwsettings.h"
#include "altitude.h"
#include "baroaltitude.h" // object that will be updated by the module
#if defined(PIOS_INCLUDE_HCSR04)
#include "sonaraltitude.h" // object that will be updated by the module
#endif
// Private constants
#define STACK_SIZE_BYTES 500
#define TASK_PRIORITY (tskIDLE_PRIORITY+1)
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#define UPDATE_PERIOD 50
// Private types
// Private variables
static xTaskHandle taskHandle;
// down sampling variables
#define alt_ds_size 4
static int32_t alt_ds_temp = 0;
static int32_t alt_ds_pres = 0;
static int alt_ds_count = 0;
static bool altitudeEnabled;
// Private functions
static void altitudeTask(void *parameters);
/**
* Initialise the module, called on startup
* \returns 0 on success or -1 if initialisation failed
*/
int32_t AltitudeStart()
{
if (altitudeEnabled) {
BaroAltitudeInitialize();
#if defined(PIOS_INCLUDE_HCSR04)
SonarAltitudeInitialze();
#endif
// Start main task
xTaskCreate(altitudeTask, (signed char *)"Altitude", STACK_SIZE_BYTES/4, NULL, TASK_PRIORITY, &taskHandle);
TaskMonitorAdd(TASKINFO_RUNNING_ALTITUDE, taskHandle);
return 0;
}
return -1;
}
/**
* Initialise the module, called on startup
* \returns 0 on success or -1 if initialisation failed
*/
int32_t AltitudeInitialize()
{
#ifdef MODULE_Altitude_BUILTIN
altitudeEnabled = 1;
#else
HwSettingsInitialize();
uint8_t optionalModules[HWSETTINGS_OPTIONALMODULES_NUMELEM];
HwSettingsOptionalModulesGet(optionalModules);
if (optionalModules[HWSETTINGS_OPTIONALMODULES_ALTITUDE] == HWSETTINGS_OPTIONALMODULES_ENABLED) {
altitudeEnabled = 1;
} else {
altitudeEnabled = 0;
}
#endif
// init down-sampling data
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alt_ds_temp = 0;
alt_ds_pres = 0;
alt_ds_count = 0;
return 0;
}
MODULE_INITCALL(AltitudeInitialize, AltitudeStart)
/**
* Module thread, should not return.
*/
static void altitudeTask(void *parameters)
{
BaroAltitudeData data;
portTickType lastSysTime;
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#if defined(PIOS_INCLUDE_HCSR04)
SonarAltitudeData sonardata;
int32_t value=0,timeout=5;
float coeff=0.25,height_out=0,height_in=0;
PIOS_HCSR04_Init();
PIOS_HCSR04_Trigger();
#endif
PIOS_BMP085_Init();
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// Main task loop
lastSysTime = xTaskGetTickCount();
while (1)
{
#if defined(PIOS_INCLUDE_HCSR04)
// Compute the current altitude (all pressures in kPa)
if(PIOS_HCSR04_Completed())
{
value = PIOS_HCSR04_Get();
if((value>100) && (value < 15000)) //from 3.4cm to 5.1m
{
height_in = value*0.00034;
height_out = (height_out * (1 - coeff)) + (height_in * coeff);
sonardata.Altitude = height_out; // m/us
}
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// Update the AltitudeActual UAVObject
SonarAltitudeSet(&sonardata);
timeout=5;
PIOS_HCSR04_Trigger();
}
if(timeout--)
{
//retrigger
timeout=5;
PIOS_HCSR04_Trigger();
}
#endif
// Update the temperature data
PIOS_BMP085_StartADC(TemperatureConv);
#ifdef PIOS_BMP085_HAS_GPIOS
xSemaphoreTake(PIOS_BMP085_EOC, portMAX_DELAY);
#else
vTaskDelay(5 / portTICK_RATE_MS);
#endif
PIOS_BMP085_ReadADC();
alt_ds_temp += PIOS_BMP085_GetTemperature();
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// Update the pressure data
PIOS_BMP085_StartADC(PressureConv);
#ifdef PIOS_BMP085_HAS_GPIOS
xSemaphoreTake(PIOS_BMP085_EOC, portMAX_DELAY);
#else
vTaskDelay(26 / portTICK_RATE_MS);
#endif
PIOS_BMP085_ReadADC();
alt_ds_pres += PIOS_BMP085_GetPressure();
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if (++alt_ds_count >= alt_ds_size)
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{
alt_ds_count = 0;
// Convert from 1/10ths of degC to degC
data.Temperature = alt_ds_temp / (10.0 * alt_ds_size);
alt_ds_temp = 0;
// Convert from Pa to kPa
data.Pressure = alt_ds_pres / (1000.0f * alt_ds_size);
alt_ds_pres = 0;
// Compute the current altitude (all pressures in kPa)
data.Altitude = 44330.0 * (1.0 - powf((data.Pressure / (BMP085_P0 / 1000.0)), (1.0 / 5.255)));
// Update the AltitudeActual UAVObject
BaroAltitudeSet(&data);
}
// Delay until it is time to read the next sample
vTaskDelayUntil(&lastSysTime, UPDATE_PERIOD / portTICK_RATE_MS);
}
}
/**
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* @}
* @}
*/