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LibrePilot/flight/modules/Telemetry/telemetry.c

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/**
******************************************************************************
* @addtogroup OpenPilotModules OpenPilot Modules
* @{
* @addtogroup TelemetryModule Telemetry Module
* @brief Main telemetry module
* Starts three tasks (RX, TX, and priority TX) that watch event queues
* and handle all the telemetry of the UAVobjects
* @{
*
* @file telemetry.c
* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
* @brief Telemetry module, handles telemetry and UAVObject updates
* @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
*/
#include <openpilot.h>
#include "telemetry.h"
#include "flighttelemetrystats.h"
#include "gcstelemetrystats.h"
#include "hwsettings.h"
#include "taskinfo.h"
// Private constants
#define MAX_QUEUE_SIZE TELEM_QUEUE_SIZE
#define STACK_SIZE_BYTES PIOS_TELEM_STACK_SIZE
#define TASK_PRIORITY_RX (tskIDLE_PRIORITY + 2)
#define TASK_PRIORITY_TX (tskIDLE_PRIORITY + 2)
#define TASK_PRIORITY_RADRX (tskIDLE_PRIORITY + 2)
#define TASK_PRIORITY_TXPRI (tskIDLE_PRIORITY + 2)
#define REQ_TIMEOUT_MS 250
#define MAX_RETRIES 2
#define STATS_UPDATE_PERIOD_MS 4000
#define CONNECTION_TIMEOUT_MS 8000
// Private types
// Private variables
static uint32_t telemetryPort;
static xQueueHandle queue;
#if defined(PIOS_TELEM_PRIORITY_QUEUE)
static xQueueHandle priorityQueue;
static xTaskHandle telemetryTxPriTaskHandle;
static void telemetryTxPriTask(void *parameters);
#else
#define priorityQueue queue
#endif
static xTaskHandle telemetryTxTaskHandle;
static xTaskHandle telemetryRxTaskHandle;
#ifdef PIOS_INCLUDE_RFM22B
static xTaskHandle radioRxTaskHandle;
#endif
static uint32_t txErrors;
static uint32_t txRetries;
static uint32_t timeOfLastObjectUpdate;
static UAVTalkConnection uavTalkCon;
#ifdef PIOS_INCLUDE_RFM22B
static UAVTalkConnection radioUavTalkCon;
#endif
// Private functions
static void telemetryTxTask(void *parameters);
static void telemetryRxTask(void *parameters);
#ifdef PIOS_INCLUDE_RFM22B
static void radioRxTask(void *parameters);
#endif
static int32_t transmitData(uint8_t *data, int32_t length);
static void registerObject(UAVObjHandle obj);
static void updateObject(UAVObjHandle obj, int32_t eventType);
static int32_t setUpdatePeriod(UAVObjHandle obj, int32_t updatePeriodMs);
static int32_t setLoggingPeriod(UAVObjHandle obj, int32_t updatePeriodMs);
static void processObjEvent(UAVObjEvent *ev);
static void updateTelemetryStats();
static void gcsTelemetryStatsUpdated();
static void updateSettings();
static uint32_t getComPort(bool input);
/**
* Initialise the telemetry module
* \return -1 if initialisation failed
* \return 0 on success
*/
int32_t TelemetryStart(void)
{
// Process all registered objects and connect queue for updates
UAVObjIterate(&registerObject);
// Listen to objects of interest
GCSTelemetryStatsConnectQueue(priorityQueue);
// Start telemetry tasks
xTaskCreate(telemetryTxTask, (signed char *)"TelTx", STACK_SIZE_BYTES / 4, NULL, TASK_PRIORITY_TX, &telemetryTxTaskHandle);
PIOS_TASK_MONITOR_RegisterTask(TASKINFO_RUNNING_TELEMETRYTX, telemetryTxTaskHandle);
xTaskCreate(telemetryRxTask, (signed char *)"TelRx", STACK_SIZE_BYTES / 4, NULL, TASK_PRIORITY_RX, &telemetryRxTaskHandle);
PIOS_TASK_MONITOR_RegisterTask(TASKINFO_RUNNING_TELEMETRYRX, telemetryRxTaskHandle);
#ifdef PIOS_INCLUDE_RFM22B
xTaskCreate(radioRxTask, (signed char *)"RadioRx", STACK_SIZE_BYTES / 4, NULL, TASK_PRIORITY_RADRX, &radioRxTaskHandle);
PIOS_TASK_MONITOR_RegisterTask(TASKINFO_RUNNING_RADIORX, radioRxTaskHandle);
#endif
#if defined(PIOS_TELEM_PRIORITY_QUEUE)
xTaskCreate(telemetryTxPriTask, (signed char *)"TelPriTx", STACK_SIZE_BYTES / 4, NULL, TASK_PRIORITY_TXPRI, &telemetryTxPriTaskHandle);
PIOS_TASK_MONITOR_RegisterTask(TASKINFO_RUNNING_TELEMETRYTXPRI, telemetryTxPriTaskHandle);
#endif
return 0;
}
/**
* Initialise the telemetry module
* \return -1 if initialisation failed
* \return 0 on success
*/
int32_t TelemetryInitialize(void)
{
FlightTelemetryStatsInitialize();
GCSTelemetryStatsInitialize();
// Initialize vars
timeOfLastObjectUpdate = 0;
// Create object queues
queue = xQueueCreate(MAX_QUEUE_SIZE, sizeof(UAVObjEvent));
#if defined(PIOS_TELEM_PRIORITY_QUEUE)
priorityQueue = xQueueCreate(MAX_QUEUE_SIZE, sizeof(UAVObjEvent));
#endif
// Update telemetry settings
telemetryPort = PIOS_COM_TELEM_RF;
HwSettingsInitialize();
updateSettings();
// Initialise UAVTalk
uavTalkCon = UAVTalkInitialize(&transmitData);
#ifdef PIOS_INCLUDE_RFM22B
radioUavTalkCon = UAVTalkInitialize(&transmitData);
#endif
// Create periodic event that will be used to update the telemetry stats
txErrors = 0;
txRetries = 0;
UAVObjEvent ev;
memset(&ev, 0, sizeof(UAVObjEvent));
EventPeriodicQueueCreate(&ev, priorityQueue, STATS_UPDATE_PERIOD_MS);
return 0;
}
MODULE_INITCALL(TelemetryInitialize, TelemetryStart);
/**
* Register a new object, adds object to local list and connects the queue depending on the object's
* telemetry settings.
* \param[in] obj Object to connect
*/
static void registerObject(UAVObjHandle obj)
{
if (UAVObjIsMetaobject(obj)) {
/* Only connect change notifications for meta objects. No periodic updates */
UAVObjConnectQueue(obj, priorityQueue, EV_MASK_ALL_UPDATES);
return;
} else {
UAVObjMetadata metadata;
UAVObjUpdateMode updateMode, loggingMode;
UAVObjGetMetadata(obj, &metadata);
updateMode = UAVObjGetTelemetryUpdateMode(&metadata);
loggingMode = UAVObjGetLoggingUpdateMode(&metadata);
// Setup object for periodic updates
UAVObjEvent ev = {
.obj = obj,
.instId = UAVOBJ_ALL_INSTANCES,
.event = (updateMode == UPDATEMODE_PERIODIC || updateMode == UPDATEMODE_THROTTLED) ? EV_UPDATED_PERIODIC : 0 | (loggingMode == UPDATEMODE_PERIODIC || loggingMode == UPDATEMODE_THROTTLED) ? EV_LOGGING_PERIODIC : 0,
};
EventPeriodicQueueCreate(&ev, queue, 0);
// Setup object for telemetry updates
updateObject(obj, EV_NONE);
}
}
/**
* Update object's queue connections and timer, depending on object's settings
* \param[in] obj Object to updates
*/
static void updateObject(UAVObjHandle obj, int32_t eventType)
{
UAVObjMetadata metadata;
UAVObjUpdateMode updateMode, loggingMode;
int32_t eventMask;
if (UAVObjIsMetaobject(obj)) {
/* This function updates the periodic updates for the object.
* Meta Objects cannot have periodic updates.
*/
PIOS_Assert(false);
return;
}
// Get metadata
UAVObjGetMetadata(obj, &metadata);
updateMode = UAVObjGetTelemetryUpdateMode(&metadata);
loggingMode = UAVObjGetLoggingUpdateMode(&metadata);
// Setup object depending on update mode
eventMask = 0;
switch (updateMode) {
case UPDATEMODE_PERIODIC:
// Set update period
setUpdatePeriod(obj, metadata.telemetryUpdatePeriod);
// Connect queue
eventMask |= EV_UPDATED_PERIODIC | EV_UPDATED_MANUAL | EV_UPDATE_REQ;
break;
case UPDATEMODE_ONCHANGE:
// Set update period
setUpdatePeriod(obj, 0);
// Connect queue
eventMask |= EV_UPDATED | EV_UPDATED_MANUAL | EV_UPDATE_REQ;
break;
case UPDATEMODE_THROTTLED:
if ((eventType == EV_UPDATED_PERIODIC) || (eventType == EV_NONE)) {
// If we received a periodic update, we can change back to update on change
eventMask |= EV_UPDATED | EV_UPDATED_MANUAL | EV_UPDATE_REQ;
// Set update period on initialization and metadata change
if (eventType == EV_NONE) {
setUpdatePeriod(obj, metadata.telemetryUpdatePeriod);
}
} else {
// Otherwise, we just received an object update, so switch to periodic for the timeout period to prevent more updates
eventMask |= EV_UPDATED_PERIODIC | EV_UPDATED_MANUAL | EV_UPDATE_REQ;
}
break;
case UPDATEMODE_MANUAL:
// Set update period
setUpdatePeriod(obj, 0);
// Connect queue
eventMask |= EV_UPDATED_MANUAL | EV_UPDATE_REQ;
break;
}
switch (loggingMode) {
case UPDATEMODE_PERIODIC:
// Set update period
setLoggingPeriod(obj, metadata.loggingUpdatePeriod);
// Connect queue
eventMask |= EV_LOGGING_PERIODIC | EV_LOGGING_MANUAL;
break;
case UPDATEMODE_ONCHANGE:
// Set update period
setLoggingPeriod(obj, 0);
// Connect queue
eventMask |= EV_UPDATED | EV_LOGGING_MANUAL;
break;
case UPDATEMODE_THROTTLED:
if ((eventType == EV_LOGGING_PERIODIC) || (eventType == EV_NONE)) {
// If we received a periodic update, we can change back to update on change
eventMask |= EV_UPDATED | EV_LOGGING_MANUAL;
// Set update period on initialization and metadata change
if (eventType == EV_NONE) {
setLoggingPeriod(obj, metadata.loggingUpdatePeriod);
}
} else {
// Otherwise, we just received an object update, so switch to periodic for the timeout period to prevent more updates
eventMask |= EV_LOGGING_PERIODIC | EV_LOGGING_MANUAL;
}
break;
case UPDATEMODE_MANUAL:
// Set update period
setLoggingPeriod(obj, 0);
// Connect queue
eventMask |= EV_LOGGING_MANUAL;
break;
}
UAVObjConnectQueue(obj, priorityQueue, eventMask);
}
/**
* Processes queue events
*/
static void processObjEvent(UAVObjEvent *ev)
{
UAVObjMetadata metadata;
UAVObjUpdateMode updateMode;
FlightTelemetryStatsData flightStats;
int32_t retries;
int32_t success;
if (ev->obj == 0) {
updateTelemetryStats();
} else if (ev->obj == GCSTelemetryStatsHandle()) {
gcsTelemetryStatsUpdated();
} else {
FlightTelemetryStatsGet(&flightStats);
// Get object metadata
UAVObjGetMetadata(ev->obj, &metadata);
updateMode = UAVObjGetTelemetryUpdateMode(&metadata);
// Act on event
retries = 0;
success = -1;
if ((ev->event == EV_UPDATED && (updateMode == UPDATEMODE_ONCHANGE || updateMode == UPDATEMODE_THROTTLED)) || ev->event == EV_UPDATED_MANUAL || ((ev->event == EV_UPDATED_PERIODIC) && (updateMode != UPDATEMODE_THROTTLED))) {
// Send update to GCS (with retries)
while (retries < MAX_RETRIES && success == -1) {
success = UAVTalkSendObject(uavTalkCon, ev->obj, ev->instId, UAVObjGetTelemetryAcked(&metadata), REQ_TIMEOUT_MS); // call blocks until ack is received or timeout
++retries;
}
// Update stats
txRetries += (retries - 1);
if (success == -1) {
++txErrors;
}
} else if (ev->event == EV_UPDATE_REQ) {
// Request object update from GCS (with retries)
while (retries < MAX_RETRIES && success == -1) {
success = UAVTalkSendObjectRequest(uavTalkCon, ev->obj, ev->instId, REQ_TIMEOUT_MS); // call blocks until update is received or timeout
++retries;
}
// Update stats
txRetries += (retries - 1);
if (success == -1) {
++txErrors;
}
}
// If this is a metaobject then make necessary telemetry updates
if (UAVObjIsMetaobject(ev->obj)) {
updateObject(UAVObjGetLinkedObj(ev->obj), EV_NONE); // linked object will be the actual object the metadata are for
} else {
if (updateMode == UPDATEMODE_THROTTLED) {
// If this is UPDATEMODE_THROTTLED, the event mask changes on every event.
updateObject(ev->obj, ev->event);
}
}
}
// Log UAVObject if necessary
if (ev->obj) {
updateMode = UAVObjGetLoggingUpdateMode(&metadata);
if ((ev->event == EV_UPDATED && (updateMode == UPDATEMODE_ONCHANGE || updateMode == UPDATEMODE_THROTTLED)) || ev->event == EV_LOGGING_MANUAL || ((ev->event == EV_LOGGING_PERIODIC) && (updateMode != UPDATEMODE_THROTTLED))) {
if (ev->instId == UAVOBJ_ALL_INSTANCES) {
success = UAVObjGetNumInstances(ev->obj);
for (retries = 0; retries < success; retries++) {
UAVObjInstanceWriteToLog(ev->obj, retries);
}
} else {
UAVObjInstanceWriteToLog(ev->obj, ev->instId);
}
}
if (updateMode == UPDATEMODE_THROTTLED) {
// If this is UPDATEMODE_THROTTLED, the event mask changes on every event.
updateObject(ev->obj, ev->event);
}
}
}
/**
* Telemetry transmit task, regular priority
*/
static void telemetryTxTask(__attribute__((unused)) void *parameters)
{
UAVObjEvent ev;
// Loop forever
while (1) {
// Wait for queue message
if (xQueueReceive(queue, &ev, portMAX_DELAY) == pdTRUE) {
// Process event
processObjEvent(&ev);
}
}
}
/**
* Telemetry transmit task, high priority
*/
#if defined(PIOS_TELEM_PRIORITY_QUEUE)
static void telemetryTxPriTask(__attribute__((unused)) void *parameters)
{
UAVObjEvent ev;
// Loop forever
while (1) {
// Wait for queue message
if (xQueueReceive(priorityQueue, &ev, portMAX_DELAY) == pdTRUE) {
// Process event
processObjEvent(&ev);
}
}
}
#endif
/**
* Telemetry receive task. Processes queue events and periodic updates.
*/
static void telemetryRxTask(__attribute__((unused)) void *parameters)
{
// Task loop
while (1) {
uint32_t inputPort = getComPort(true);
if (inputPort) {
// Block until data are available
uint8_t serial_data[1];
uint16_t bytes_to_process;
bytes_to_process = PIOS_COM_ReceiveBuffer(inputPort, serial_data, sizeof(serial_data), 500);
if (bytes_to_process > 0) {
for (uint8_t i = 0; i < bytes_to_process; i++) {
UAVTalkProcessInputStream(uavTalkCon, serial_data[i]);
}
}
} else {
vTaskDelay(5);
}
}
}
#ifdef PIOS_INCLUDE_RFM22B
/**
* Radio telemetry receive task. Processes queue events and periodic updates.
*/
static void radioRxTask(__attribute__((unused)) void *parameters)
{
// Task loop
while (1) {
if (telemetryPort) {
// Block until data are available
uint8_t serial_data[1];
uint16_t bytes_to_process;
bytes_to_process = PIOS_COM_ReceiveBuffer(telemetryPort, serial_data, sizeof(serial_data), 500);
if (bytes_to_process > 0) {
for (uint8_t i = 0; i < bytes_to_process; i++) {
UAVTalkProcessInputStream(radioUavTalkCon, serial_data[i]);
}
}
} else {
vTaskDelay(5);
}
}
}
#endif /* PIOS_INCLUDE_RFM22B */
/**
* Transmit data buffer to the modem or USB port.
* \param[in] data Data buffer to send
* \param[in] length Length of buffer
* \return -1 on failure
* \return number of bytes transmitted on success
*/
static int32_t transmitData(uint8_t *data, int32_t length)
{
uint32_t outputPort = getComPort(false);
if (outputPort) {
return PIOS_COM_SendBuffer(outputPort, data, length);
}
return -1;
}
/**
* Set update period of object (it must be already setup for periodic updates)
* \param[in] obj The object to update
* \param[in] updatePeriodMs The update period in ms, if zero then periodic updates are disabled
* \return 0 Success
* \return -1 Failure
*/
static int32_t setUpdatePeriod(UAVObjHandle obj, int32_t updatePeriodMs)
{
UAVObjEvent ev;
// Add object for periodic updates
ev.obj = obj;
ev.instId = UAVOBJ_ALL_INSTANCES;
ev.event = EV_UPDATED_PERIODIC;
return EventPeriodicQueueUpdate(&ev, queue, updatePeriodMs);
}
/**
* Set logging update period of object (it must be already setup for periodic updates)
* \param[in] obj The object to update
* \param[in] updatePeriodMs The update period in ms, if zero then periodic updates are disabled
* \return 0 Success
* \return -1 Failure
*/
static int32_t setLoggingPeriod(UAVObjHandle obj, int32_t updatePeriodMs)
{
UAVObjEvent ev;
// Add object for periodic updates
ev.obj = obj;
ev.instId = UAVOBJ_ALL_INSTANCES;
ev.event = EV_LOGGING_PERIODIC;
return EventPeriodicQueueUpdate(&ev, queue, updatePeriodMs);
}
/**
* Called each time the GCS telemetry stats object is updated.
* Trigger a flight telemetry stats update if a connection is not
* yet established.
*/
static void gcsTelemetryStatsUpdated()
{
FlightTelemetryStatsData flightStats;
GCSTelemetryStatsData gcsStats;
FlightTelemetryStatsGet(&flightStats);
GCSTelemetryStatsGet(&gcsStats);
if (flightStats.Status != FLIGHTTELEMETRYSTATS_STATUS_CONNECTED || gcsStats.Status != GCSTELEMETRYSTATS_STATUS_CONNECTED) {
updateTelemetryStats();
}
}
/**
* Update telemetry statistics and handle connection handshake
*/
static void updateTelemetryStats()
{
UAVTalkStats utalkStats;
FlightTelemetryStatsData flightStats;
GCSTelemetryStatsData gcsStats;
uint8_t forceUpdate;
uint8_t connectionTimeout;
uint32_t timeNow;
// Get stats
UAVTalkGetStats(uavTalkCon, &utalkStats);
#ifdef PIOS_INCLUDE_RFM22B
UAVTalkAddStats(radioUavTalkCon, &utalkStats);
UAVTalkResetStats(radioUavTalkCon);
#endif
UAVTalkResetStats(uavTalkCon);
// Get object data
FlightTelemetryStatsGet(&flightStats);
GCSTelemetryStatsGet(&gcsStats);
// Update stats object
if (flightStats.Status == FLIGHTTELEMETRYSTATS_STATUS_CONNECTED) {
flightStats.RxDataRate = (float)utalkStats.rxBytes / ((float)STATS_UPDATE_PERIOD_MS / 1000.0f);
flightStats.TxDataRate = (float)utalkStats.txBytes / ((float)STATS_UPDATE_PERIOD_MS / 1000.0f);
flightStats.RxFailures += utalkStats.rxErrors;
flightStats.TxFailures += txErrors;
flightStats.TxRetries += txRetries;
txErrors = 0;
txRetries = 0;
} else {
flightStats.RxDataRate = 0;
flightStats.TxDataRate = 0;
flightStats.RxFailures = 0;
flightStats.TxFailures = 0;
flightStats.TxRetries = 0;
txErrors = 0;
txRetries = 0;
}
// Check for connection timeout
timeNow = xTaskGetTickCount() * portTICK_RATE_MS;
if (utalkStats.rxObjects > 0) {
timeOfLastObjectUpdate = timeNow;
}
if ((timeNow - timeOfLastObjectUpdate) > CONNECTION_TIMEOUT_MS) {
connectionTimeout = 1;
} else {
connectionTimeout = 0;
}
// Update connection state
forceUpdate = 1;
if (flightStats.Status == FLIGHTTELEMETRYSTATS_STATUS_DISCONNECTED) {
// Wait for connection request
if (gcsStats.Status == GCSTELEMETRYSTATS_STATUS_HANDSHAKEREQ) {
flightStats.Status = FLIGHTTELEMETRYSTATS_STATUS_HANDSHAKEACK;
}
} else if (flightStats.Status == FLIGHTTELEMETRYSTATS_STATUS_HANDSHAKEACK) {
// Wait for connection
if (gcsStats.Status == GCSTELEMETRYSTATS_STATUS_CONNECTED) {
flightStats.Status = FLIGHTTELEMETRYSTATS_STATUS_CONNECTED;
} else if (gcsStats.Status == GCSTELEMETRYSTATS_STATUS_DISCONNECTED) {
flightStats.Status = FLIGHTTELEMETRYSTATS_STATUS_DISCONNECTED;
}
} else if (flightStats.Status == FLIGHTTELEMETRYSTATS_STATUS_CONNECTED) {
if (gcsStats.Status != GCSTELEMETRYSTATS_STATUS_CONNECTED || connectionTimeout) {
flightStats.Status = FLIGHTTELEMETRYSTATS_STATUS_DISCONNECTED;
} else {
forceUpdate = 0;
}
} else {
flightStats.Status = FLIGHTTELEMETRYSTATS_STATUS_DISCONNECTED;
}
// Update the telemetry alarm
if (flightStats.Status == FLIGHTTELEMETRYSTATS_STATUS_CONNECTED) {
AlarmsClear(SYSTEMALARMS_ALARM_TELEMETRY);
} else {
AlarmsSet(SYSTEMALARMS_ALARM_TELEMETRY, SYSTEMALARMS_ALARM_ERROR);
}
// Update object
FlightTelemetryStatsSet(&flightStats);
// Force telemetry update if not connected
if (forceUpdate) {
FlightTelemetryStatsUpdated();
}
}
/**
* Update the telemetry settings, called on startup.
* FIXME: This should be in the TelemetrySettings object. But objects
* have too much overhead yet. Also the telemetry has no any specific
* settings, etc. Thus the HwSettings object which contains the
* telemetry port speed is used for now.
*/
static void updateSettings()
{
if (telemetryPort) {
// Retrieve settings
uint8_t speed;
HwSettingsTelemetrySpeedGet(&speed);
// Set port speed
switch (speed) {
case HWSETTINGS_TELEMETRYSPEED_2400:
PIOS_COM_ChangeBaud(telemetryPort, 2400);
break;
case HWSETTINGS_TELEMETRYSPEED_4800:
PIOS_COM_ChangeBaud(telemetryPort, 4800);
break;
case HWSETTINGS_TELEMETRYSPEED_9600:
PIOS_COM_ChangeBaud(telemetryPort, 9600);
break;
case HWSETTINGS_TELEMETRYSPEED_19200:
PIOS_COM_ChangeBaud(telemetryPort, 19200);
break;
case HWSETTINGS_TELEMETRYSPEED_38400:
PIOS_COM_ChangeBaud(telemetryPort, 38400);
break;
case HWSETTINGS_TELEMETRYSPEED_57600:
PIOS_COM_ChangeBaud(telemetryPort, 57600);
break;
case HWSETTINGS_TELEMETRYSPEED_115200:
PIOS_COM_ChangeBaud(telemetryPort, 115200);
break;
}
}
}
/**
* Determine input/output com port as highest priority available
* @param[in] input Returns the approproate input com port if true, else the appropriate output com port
*/
static uint32_t getComPort(bool input)
{
#ifndef PIOS_INCLUDE_RFM22B
input = false;
#endif
#if defined(PIOS_INCLUDE_USB)
if (PIOS_COM_Available(PIOS_COM_TELEM_USB)) {
return PIOS_COM_TELEM_USB;
} else
#endif /* PIOS_INCLUDE_USB */
if (!input && PIOS_COM_Available(telemetryPort)) {
return telemetryPort;
} else {
return 0;
}
}
/**
* @}
* @}
*/
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