#include <18F452.h> // Standard Include for 18F452 Chip #fuses HS,NOWDT,NOPROTECT,NOLVP,PUT // High Speed Clock, No Watch Dog Timer, No Code Protection, No Low Voltage P?, Power Up Timer #use delay (clock=40000000) // 40 mhz powered oscillator /* Keeps track of the state we are in 0 for drawing line with variable horizontal position and width 1 for moving square around the screen 2 for writing I T P P I C T V */ unsigned byte state = 0; unsigned byte max_state = 2; /* Counters to see what line and frame we are on */ unsigned long line_counter = 0; unsigned long frame_counter = 0; /* ADC Values */ unsigned byte a0_value = 100; unsigned byte a1_value = 100; /* Horizontal and Vertical Positions */ unsigned byte horizontal_pos; unsigned byte vertical_pos; /* Width and Height of the Square, Width for the Box */ unsigned byte width = 10; unsigned byte height = 40; /* Constants with which to reset the box */ unsigned byte sq_width = 10; // THIS IS A CONSTANT unsigned byte sq_height = 40; // THIS IS A CONSTANT /* Constant for which lines to draw letters in */ unsigned byte min_line = 50; unsigned byte max_line = 150; /* Frame Count Max Value for letter drawing (per letter) */ unsigned long max_frames = 50; /* Which letter we are on */ unsigned byte letter_number = 0; /* Which line of the bitmap letter we are on */ unsigned byte mod_count; /* Bitmap Letter I */ unsigned byte letter_i[] = { 0b01110000, 0b00100000, 0b00100000, 0b00100000, 0b00100000, 0b00100000, 0b00100000, 0b00100000, 0b01110000, 0b00000000 }; /* Bitmap Letter T */ unsigned byte letter_t[] = { 0b11111000, 0b10101000, 0b00100000, 0b00100000, 0b00100000, 0b00100000, 0b00100000, 0b00100000, 0b00100000, 0b00000000 }; /* Bitmap Letter P */ unsigned byte letter_p[] = { 0b11111100, 0b10000100, 0b10000100, 0b10000100, 0b10000100, 0b11111100, 0b10000000, 0b10000000, 0b10000000, 0b00000000, }; /* Bitmap Letter C */ unsigned byte letter_c[] = { 0b11111100, 0b10000100, 0b10000000, 0b10000000, 0b10000000, 0b10000000, 0b10000000, 0b10000100, 0b11111100, 0b00000000 }; /* Bitmap Letter V */ unsigned byte letter_v[] = { 0b10000100, 0b10000100, 0b10000100, 0b10000100, 0b10000100, 0b10000100, 0b01001000, 0b01001000, 0b00110000, 0b00000000 }; void pixelNop() { #ASM nop nop #ENDASM } /* Draw a line with variable width and horizontal position */ void drawLine() { output_low(PIN_D1); // Low/Black to Start delay_us(horizontal_pos); // Delay to the position on screen we want output_high(PIN_D1); // High/White on delay_us(width); // Delay the width of the line we want output_low(PIN_D1); // Low/Black to End } /* Draw a square that you can move around on the screen, ala etch-a-sketch */ void drawSquare() { output_low(PIN_D1); // Start with Low/Black delay_us(horizontal_pos); // Delay to the horizontal position on screen //If we are on the correct line count for vertical position if (line_counter >= vertical_pos - height/2 && line_counter <= vertical_pos + height/2) { output_high(PIN_D1); // Give us White delay_us(width); // Delay for the width of the square } output_low(PIN_D1); // Always Low/Black to End } /* Interrupt for a new field */ #INT_EXT1 void fieldInterrupt() { line_counter = 0; frame_counter++; if (frame_counter > max_frames) { frame_counter = 0; letter_number++; letter_number = letter_number%10; } } /* Interrupt for a line to be drawn */ #INT_EXT2 void drawMe () { byte p; if (state == 0) { drawLine(); } else if (state == 1) { drawSquare(); } else // Draw The Letters -- Not a seperate function because of time { //drawLetters(); if (line_counter > 50 && line_counter < 150) // If we are in the right range of lines { if (letter_number == 0) { for (p = 8; p > 0; p--) // Draw from left to right on the bitmap instead of right to left (start with index 7) { if (bit_test(letter_i[mod_count],p-1)) // Test the bit of the byte for this line of this letter { output_high(PIN_D1); // white if high pixelNop(); } else { output_low(PIN_D1); // black if low pixelNop(); } } } else if (letter_number == 1) { for (p = 8; p > 0; p--) // Draw from left to right on the bitmap instead of right to left (start with index 7) { if (bit_test(letter_t[mod_count],p-1)) // Test the bit of the byte for this line of this letter { output_high(PIN_D1); // white if high pixelNop(); } else { output_low(PIN_D1); // black if low pixelNop(); } } } else if (letter_number == 2) { for (p = 8; p > 0; p--) // Draw from left to right on the bitmap instead of right to left (start with index 7) { if (bit_test(letter_p[mod_count],p-1)) // Test the bit of the byte for this line of this letter { output_high(PIN_D1); // white if high pixelNop(); } else { output_low(PIN_D1); // black if low pixelNop(); } } } else if (letter_number == 3) { pixelNop(); pixelNop(); pixelNop(); } else if (letter_number == 4) { for (p = 8; p > 0; p--) // Draw from left to right on the bitmap instead of right to left (start with index 7) { if (bit_test(letter_p[mod_count],p-1)) // Test the bit of the byte for this line of this letter { output_high(PIN_D1); // white if high pixelNop(); } else { output_low(PIN_D1); // black if low pixelNop(); } } } else if (letter_number == 5) { for (p = 8; p > 0; p--) // Draw from left to right on the bitmap instead of right to left (start with index 7) { if (bit_test(letter_i[mod_count],p-1)) // Test the bit of the byte for this line of this letter { output_high(PIN_D1); // white if high pixelNop(); } else { output_low(PIN_D1); // black if low pixelNop(); } } } else if (letter_number == 6) { for (p = 8; p > 0; p--) // Draw from left to right on the bitmap instead of right to left (start with index 7) { if (bit_test(letter_c[mod_count],p-1)) // Test the bit of the byte for this line of this letter { output_high(PIN_D1); // white if high pixelNop(); } else { output_low(PIN_D1); // black if low pixelNop(); } } } else if (letter_number == 7) { for (p = 8; p > 0; p--) // Draw from left to right on the bitmap instead of right to left (start with index 7) { if (bit_test(letter_t[mod_count],p-1)) // Test the bit of the byte for this line of this letter { output_high(PIN_D1); // white if high pixelNop(); } else { output_low(PIN_D1); // black if low pixelNop(); } } } else if (letter_number == 8) { for (p = 8; p > 0; p--) // Draw from left to right on the bitmap instead of right to left (start with index 7) { if (bit_test(letter_v[mod_count],p-1)) // Test the bit of the byte for this line of this letter { output_high(PIN_D1); // white if high pixelNop(); } else { output_low(PIN_D1); // black if low pixelNop(); } } } else if (letter_number == 9) { pixelNop(); pixelNop(); pixelNop(); } // Do the math mod_count = (line_counter-50)/10; output_low(PIN_D1); } // End Right Line Zone } // End Draw Letters line_counter++; } // End Function main() { boolean switch_on = 0; /* Setup ADC */ setup_adc(ADC_CLOCK_INTERNAL ); setup_adc_ports( ALL_ANALOG ); /* Delay To Start */ delay_ms(500); /* Enable the Interrupts */ enable_interrupts(GLOBAL); ENABLE_INTERRUPTS(INT_EXT2); // Set up PIC18 EXT2 ext_int_edge( 2, L_TO_H); ENABLE_INTERRUPTS(INT_EXT1); // Set up PIC18 EXT1 ext_int_edge( 1, L_TO_H); ENABLE_INTERRUPTS(INT_EXT); // Set up PIC18 EXT0 ext_int_edge( L_TO_H); /* Main Loop */ while(TRUE) { /* Read ADC Channel 0 */ set_adc_channel(0); delay_us(10); // Delay before read a0_value = read_adc(); // Read ADC from POT on A0, 0 to 255 /* Read ADC Channel 1 */ set_adc_channel(1); delay_us(10); // Delay before read a1_value = read_adc(); // Read ADC from POT on A1, 0 to 255 if (state == 0) // Line Drawing { horizontal_pos = a0_value/5; // Set Horizontal Postion using ADC value (div by 5) width = a1_value/5; // Set width of line on screen using ADC value (div by 5 = 0 to 51 } else if (state == 1) // Box Drawing { // Reset Width and Height for the square (this doesn't need to be done every time but...) width = sq_width; height = sq_height; horizontal_pos = a0_value/5; // Set Horizontal Postion using ADC value (div by 5 = 0 to 51) vertical_pos = a1_value; // Set Vertical Position using ADC value (0 to 255) } else if (state == 2) // Letter Writing { max_frames = a0_value; } /* Check state of button and change state */ if (input(PIN_D7)) { if (!switch_on) { switch_on = 1; if (state < max_state) { state++; } else { state = 0; } } } else { switch_on = 0; } } }