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// main board (and software running on it) of the task of interfacing with any
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// of the RC system.
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// The 8 channels (from the RC receiver) need to be combined and fed to two
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// interrupts on the Arduino. They need to be combined in such a way as to
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// alternate pulses between the two interrupts (which are alternately used to
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// If this turns out to be the case, you will need to arrange for the pulses to
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// wire up the channels in an order whereby the pulses alternatively alternately
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// between the two interrupts and adjust the channel order below.
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#include "config.h"
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#include "receiver.h"
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// the width of the display of a single channel (in chars)
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// the channel's expected range for use in drawing (should be similar to
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// {MAX,MIN}_PULSE_WIDTH values)
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#define GRAPH_MIN 1000
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#define GRAPH_MAX 2000
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pinMode( LED_PIN, OUTPUT );
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digitalWrite( LED_PIN, LOW );
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void draw_graph( unsigned long channel_values[] )
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static char graph[ GRAPH_SIZE + 2 ];
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static char inited_graph = false;
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for( int a = 1; a < GRAPH_SIZE + 1; a++ )
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graph[ GRAPH_SIZE + 1 ] = 0;
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for( int a = 0; a < NUM_CHANNELS; a++ ) {
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unsigned long value = max( 0,
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min( channel_values[ a ], GRAPH_MAX ) - GRAPH_MIN );
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int pos = ( GRAPH_SIZE ) * value / ( GRAPH_MAX - GRAPH_MIN );
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graph[ pos + 1 ] = '^';
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Serial.print( graph );
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graph[ pos + 1 ] = '_';
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Serial.println( "|" );
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static bool on = false;
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digitalWrite( LED_PIN, on? HIGH : LOW );
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unsigned long channel_values[ NUM_CHANNELS ];
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int channel_values[ NUM_CHANNELS ];
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// have we read a whole set of channel values?
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if( Receiver::read_channels( channel_values ) )
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draw_graph( channel_values );
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// send channel values to main board
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Comms::write_channels( channel_values );
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Motors::set_values( channel_values );