mirror of https://github.com/ArduPilot/ardupilot
ArduPPM: redundancy mode
Channel count auto detection post processing code Added a #define : valid frames threshold before detection validation
This commit is contained in:
Olivier ADLER
parent
6a40fcd56a
commit
e0393e541c
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@ -68,6 +68,8 @@ volatile uint8_t servo_input_mode = JUMPER_SELECT_MODE;
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#define SWITCHOVER_1_to_2_DELAY_MS 50 // Delay for switching to receiver 2
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#define SWITCHOVER_2_to_1_DELAY_MS 200 // Delay for switching back to receiver 1
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#define CHANNEL_COUNT_DETECTION_THRESHOLD 10 // Valid frames detected before channel count validation
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// 0 for standard PPM, 1 for PPMv2 (Futaba 760 us 16 Channels), 2 for PPMv3 (Jeti 1050 us 16 channels), 3 for Hitec 9 channels
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// PPM input frame mode receiver 1
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@ -595,6 +597,16 @@ ISR( SERVO_INT_VECTOR )
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// PPM redundancy mode
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// ------------------------------------------------------------------------------
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//---------------------------------------------------------------------
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// Todo : Conversion to PPM output format
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// Todo : sync between PPM input and output after switchover
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// Todo : rework code from line 950 to end of redundancy mode
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// Todo : Add delay inside switchover algo
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// Todo : Add LED code for APM 1.4
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//-------------------------------------------------------------------------
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if( servo_input_mode == PPM_REDUNDANCY_MODE )
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{
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// -------------------------------------
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@ -641,9 +653,13 @@ ISR( SERVO_INT_VECTOR )
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static bool sync_error_ch1 = true;
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static bool sync_error_ch2 = true;
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//---------------------------------------------------------
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// ch2 switchover flag
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static bool switchover_ch2 = false;
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//---------------------------------------------------------
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// Channel count detection ready flag
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static bool channel_count_ready_ch1 = false;
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static bool channel_count_ready_ch2 = false;
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@ -656,6 +672,14 @@ ISR( SERVO_INT_VECTOR )
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static uint8_t channel_count_ch1 = PPM_CH1_MAX_CHANNELS;
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static uint8_t channel_count_ch2 = PPM_CH2_MAX_CHANNELS;
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// Detected Channel count previous value
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static uint8_t previous_channel_count_ch1 = 0;
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static uint8_t previous_channel_count_ch2 = 0;
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// Channel count detection counter
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static uint8_t channel_count_detection_counter_ch1 = 0;
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static uint8_t channel_count_detection_counter_ch1 = 0;
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// -----------------------------------
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// PPM redundancy - decoder
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@ -777,23 +801,111 @@ CHECK_LOOP: // Input PPM pins check loop
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// -----------------------------------------------------------------------------------------------------------------------
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}
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//----------------------------------------------------------------------------------------------------------------------
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// Todo : Conversion to PPM output format
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// Todo : rework code from line 830 to end of redundancy mode
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// Todo : channel count auto detection : write post processing
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// Todo : sync between PPM input and output after switchover
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// Todo : Add delay inside switchover algo
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// Todo : Add LED code for APM 1.4
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//----------------------------------------------------------------------------------------------------------------------
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// -----------------------------------
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// PPM redundancy - Ch2 decoding
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// -----------------------------------
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// Todo : duplicate decoder code for PPM channel 2
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// Check if we have a pin change on PPM channel 2
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if( servo_change & 2 )
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{
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// -----------------------------------------------------------------------------------------------------------------------
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// Check if we've got a high level (raising edge, channel start or sync symbol end)
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if( servo_pins & 2 )
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{
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// Check for pre pulse lenght
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ppm2_prepulse_width = servo_time - ppm2_prepulse_start;
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if ( true ) //Todo optionnal: We could add a test here for channel pre pulse lenght check
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{
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//We have a valid pre pulse
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}
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else
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{
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//We do not have a valid pre pulse
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sync_error_ch2 = true; // Set sync error flag
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sync_ch2 = false; // Reset sync flag
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ppm2_channel = 0; // Reset PPM channel counter
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last_channel_ch2 = false; // Reset last channel flag
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}
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ppm2_start[ ppm2_channel ] = servo_time; // Store pulse start time for PPM2 input
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}
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// -----------------------------------------------------------------------------------------------------------------------
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else // We've got a low level (falling edge, channel end or sync symbol start)
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{
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ppm2_width[ ppm2_channel ] = servo_time - ppm2_start[ ppm2_channel ]; // Calculate channel pulse lenght, or sync symbol lenght
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if(sync_ch2 == true) // Are we synchronized ?
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{
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// Check channel pulse lenght validity
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if( ppm2_width[ ppm2_channel ] > ( PPM_CH2_VAL_MAX - PPM_CH2_CHANNEL_PREPULSE_LENGHT ) ) || ( ppm2_width[ ppm2_channel ] < ( PPM_CH2_VAL_MIN - PPM_CH2_CHANNEL_PREPULSE_LENGHT ) ) // If we have a valid pulse lenght
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{
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// Reset channel error flag
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channel_error_ch2 = false;
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if( ppm2_channel == channel_count_ch2 ) // Check for last channel
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{
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// We are at latest PPM channel
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last_channel_ch2 = true; // Set last channel flag
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sync_ch2 = false; // Reset sync flag
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ppm2_channel = 0; // Reset PPM channel counter
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}
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else // We do not have yet reached the last channel
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{
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// Increment channel counter
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ppm2_channel++;
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}
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}
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else // We do not have a valid channel lenght
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{
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if( ppm2_width[ ppm2_channel ] > PPM_CH2_MIN_SYNC_LENGHT ) || ( ppm2_width[ ppm2_channel ] < PPM_CH2_MAX_SYNC_LENGHT ) //Check for sync symbol
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{
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// We have a valid sync symbol
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if( channel_count_detected_ch2 == false ) // Check if do not have yet channel count detected
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{
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// We have detected channels count
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channel_count_ch2 = ppm2_channel; // Store PPM2 channel count
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channel_count_ready_ch2 = true; // Set PPM2 channel count detection ready flag
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sync_error_ch2 = false; // Reset sync error flag
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sync_ch2 = true; // Set sync flag
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ppm2_channel = 0; // Reset PPM channel counter
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last_channel_ch2 = false; // Reset last channel flag
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}
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else // Channel count had been detected before
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{
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//We should not have a sync symbol here
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sync_error_ch2 = true; // Set sync error flag
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last_channel_ch2 = false; // Reset last channel flag
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sync_ch2 = false; // Reset sync flag
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ppm2_channel = 0; // Reset PPM channel counter
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}
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}
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else // We do not have a valid sync symbol
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{
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channel_error_ch2 = true; // Set channel error flag
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}
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}
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}
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// ------------------------------------------------------------------------------
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else // We are not yet synchronized
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{
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if( ppm2_width[ ppm2_channel ] > PPM_CH2_MIN_SYNC_LENGHT ) || ( ppm2_width[ ppm2_channel ] < PPM_CH2_MAX_SYNC_LENGHT ) //Check for sync symbol
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{
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// We have a valid sync symbol
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sync_error_ch2 = false; // Reset sync error flag
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sync_ch2 = true; // Set sync flag
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}
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else // We did not find a valid sync symbol
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{
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sync_error_ch2 = true; // Set sync error flag
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sync_ch2 = false; // Reset sync flag
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}
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ppm2_channel = 0; // Reset PPM channel counter
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last_channel_ch2 = false; // Reset last channel flag
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}
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}
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ppm2_prepulse_start = servo_time; // Store prepulse start time
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// -----------------------------------------------------------------------------------------------------------------------
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}
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// -----------------------------------
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// PPM redundancy - Post processing
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@ -802,16 +914,20 @@ CHECK_LOOP: // Input PPM pins check loop
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// Could be eventually run in the main loop for performances improvements if necessary
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// sync mode between input and ouptput should clear performance problems
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// -----------------
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// Switchover code
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// -----------------
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// Check for PPM1 validity
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if ( sync_error_ch1 == false ) && ( channel_error_ch1 == false) // PPM1 is valid
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{
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// check for PPM2 forcing (through PPM1 force channel)
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if ( ppm1_width [ SWITCHOVER_CHANNEL ] > PPM_CH1_FORCE_VAL_MIN ) // Force channel active
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if ( ppm1_width [ SWITCHOVER_CHANNEL ] > PPM_CH1_FORCE_VAL_MIN ) // Channel 2 forcing is alive
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{
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// Check for PPM2 validity
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if ( sync_error_ch2 == false ) && ( channel_error_ch2 == false) // PPM2 is valid
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{
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// Check PPM2 selected
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// Check for PPM2 selected
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if ( switchover_ch2 == true ) // PPM2 is selected
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{
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// Do nothing
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@ -827,7 +943,8 @@ CHECK_LOOP: // Input PPM pins check loop
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{
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if ( switchover_ch2 == false ) // PPM1 is selected
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{
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//Do Nothing
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// Load PPM Output with PPM1
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ppm[ ppm1_channel ] = ppm1_width;
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}
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else // PPM1 is not selected
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{
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@ -844,7 +961,8 @@ CHECK_LOOP: // Input PPM pins check loop
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// Check PPM2 selected
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if ( switchover_ch2 == true ) // PPM2 is selected
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{
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// Do nothing
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// Load PPM Output with PPM2
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ppm[ ppm2_channel ] = ppm2_width;
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}
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else // Switch to PPM2
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{
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@ -859,22 +977,80 @@ CHECK_LOOP: // Input PPM pins check loop
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}
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}
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// -----------------------------------
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// Channel count post processing code
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// -----------------------------------
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UPDATE_PPM_OUTPUT: // Update PPM output according to frame validity
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// To enhance: possible global detection flag to avoid 2 channel_count_detected tests
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// Ch1
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if ( channel_count_detected_ch1 == true ) // Channel count for Ch1 was detected
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{
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// Do nothing
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}
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else // Do we have a channel count detection ready ?
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{
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if ( channel_count_ready_ch1 == true ) // If channel count is ready
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{
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// Check for detection counter
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if ( channel_count_detection_counter_ch1 < CHANNEL_COUNT_DETECTION_THRESHOLD ) // Detection counter < Threshold
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{
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// Compare channel count with previous value
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if ( channel_count_ch1 == previous_channel_count_ch1 ) // We have the same value
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{
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channel_count_detection_counter_ch1++; // Increment detection counter
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}
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else // We do not have the same value
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{
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channel_count_detection_counter_ch1 = 0; // Reset detection counter
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}
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previous_channel_count_ch1 = channel_count_ch1; // Load previous channel count with channel count
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}
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else // Detection counter >= Threshold
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{
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channel_count_detected_ch1 = true; // Channel count is now detected
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}
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channel_count_ready_ch1 = false; // Reset channel count detection ready flag
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}
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}
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// Ch2
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if ( channel_count_detected_ch2 == true ) // Channel count for ch2 was detected
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{
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// Do nothing
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}
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else // Do we have a channel count detection ready ?
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{
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if ( channel_count_ready_ch2 == true ) // If channel count is ready
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{
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// Check for detection counter
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if ( channel_count_detection_counter_ch2 < CHANNEL_COUNT_DETECTION_THRESHOLD ) // Detection counter < Threshold
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{
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// Compare channel count with previous value
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if ( channel_count_ch2 == previous_channel_count_ch2 ) // We have the same value
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{
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channel_count_detection_counter_ch2++; // Increment detection counter
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}
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else // We do not have the same value
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{
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channel_count_detection_counter_ch2 = 0; // Reset detection counter
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}
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previous_channel_count_ch2 = channel_count_ch2; // Load previous channel count with channel count
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}
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else // Detection counter >= Threshold
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{
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channel_count_detected_ch2 = true; // Channel count is now detected
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}
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channel_count_ready_ch2 = false; // Reset channel count detection ready flag
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}
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}
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// Update PPM output channel from PPM input 1
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// ppm[ ppm1_channel ] = ppm1_width;
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// Update PPM output channel from PPM input 2
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// ppm[ ppm2_channel ] = ppm2_width;
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/*
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//Reset throttle failsafe timeout
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if( ppm1_channel == 5 ) throttle_timeout = 0;
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//if( ppm2_channel == 5 ) throttle_timeout = 0;
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CHECK_ERROR:
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#if defined (__AVR_ATmega16U2__) || defined (__AVR_ATmega32U2__)
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