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#define NUM_SECOND_SEGMENTS 5
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#define NUM_SEGMENTS ( 60 * NUM_SECOND_SEGMENTS )
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// clock draw direction
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#define CLOCK_FORWARD 0
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// rotate display (in segments)
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#define CLOCK_SHIFT ( 58 * NUM_SECOND_SEGMENTS - 1 )
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//_____________________________________________________________________________
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// draw a segment for the test display
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void drawNextSegment_test( bool reset )
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void drawNextSegment_test( int segment )
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// keep track of segment
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static unsigned int segment = 0;
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if( reset ) segment = 0;
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// turn on inside and outside LEDs
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// turn on outside LEDs
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ledOn( 9, true );
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// display segment number in binary across in the inside LEDs,
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// with the LED on pin 12 showing the least-significant bit
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for( int a = 0; a < 8; a++ )
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for( int a = 0; a < 9; a++ )
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ledOn( 8 - a, ( segment >> a ) & 1 );
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// draw a segment for the time display
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void drawNextSegment_time( bool reset )
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void drawNextSegment_time( int segment )
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static int second = 0;
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static int segment = 0;
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// handle display reset
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int second = segment / NUM_SECOND_SEGMENTS;
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int second_segment = segment % NUM_SECOND_SEGMENTS;
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// what needs to be drawn?
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bool draw_tick = !segment && second % 5 == 0;
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bool draw_second = !segment && second == time_seconds;
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bool draw_minute = !segment && second == time_minutes;
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bool draw_hour = !segment && second == time_hours;
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bool draw_tick = ( !second_segment && second % 5 == 0 && second ) ||
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( second == 0 && second_segment == 1 ) ||
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( second == 59 && second_segment == NUM_SECOND_SEGMENTS - 1 );
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bool draw_second = !second_segment && second == time_seconds;
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bool draw_minute = !second_segment && second == time_minutes;
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bool draw_hour = segment == time_hours * 5 * NUM_SECOND_SEGMENTS +
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( 5 * NUM_SECOND_SEGMENTS * time_minutes / 60 );
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ledOn( 9, true );
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ledOn( 8, draw_tick || draw_minute );
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ledOn( 8, draw_tick || draw_second );
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for( int a = 6; a <= 7; a++ )
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ledOn( a, draw_minute || draw_second );
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for( int a = 0; a <= 5; a++ )
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ledOn( a, draw_minute || draw_second || draw_hour );
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if( ++segment >= NUM_SECOND_SEGMENTS ) {
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static int draw_mode = 0;
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// keep track of segment
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static int segment = ( NUM_SEGMENTS - CLOCK_SHIFT ) % NUM_SEGMENTS;
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if( reset ) segment = ( NUM_SEGMENTS - CLOCK_SHIFT ) % NUM_SEGMENTS;
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static int segment = NUM_SEGMENTS - 1 - CLOCK_SHIFT;
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if( reset ) segment = NUM_SEGMENTS - 1 - CLOCK_SHIFT;
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// handle mode switch requests
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if( reset && inc_draw_mode ) {
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inc_draw_mode = false;
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// draw the segment
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switch( draw_mode ) {
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case 0: drawNextSegment_test( reset ); break;
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case 1: drawNextSegment_time( reset ); break;
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case 0: drawNextSegment_test( segment ); break;
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case 1: drawNextSegment_time( segment ); break;
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if( ++segment >= NUM_SEGMENTS ) segment = 0;
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if( --segment < 0 ) segment = NUM_SEGMENTS - 1;