git.defcon.no Git - avrfbosd/blob - fbosd.c

   1 #include <avr/io.h>
   2 #include <avr/interrupt.h>
   3 #include <util/delay.h>
   4 #include <stdlib.h>
   5 #include <avr/pgmspace.h>
   6
   7 #include "video_properties.h"
   8 #include "render.h"
   9 #include "draw.h"
  10
  11 #include "testimage.h"
  12
  13 void (*line_handler)( void );
  14
  15 const int vres_scale = ( SCREEN_LINES / VRES -1 );
  16 const int hres_bytes = HRES / 8;
  17
  18 volatile uint8_t* screen_buffer;
  19
  20 volatile int line;
  21 volatile int buffer_position;
  22
  23 void Delay_ms(int cnt)
  24 {
  25         while(cnt-->0) _delay_ms(1);
  26 }
  27
  28 void set_busy ( uint8_t busy)
  29 {
  30         if ( busy )
  31         {
  32                 // Set busy signal
  33                 PORTB |= (1 << PB1);
  34
  35                 // TODO: Disable SPI communication here...
  36         }
  37         else
  38         {
  39                 // Clear Busy signal
  40                 PORTB &= ~(uint8_t)(1 << PB1);
  41
  42                 // TODO: Enable SPI communication here...
  43         }
  44 }
  45
  46 void active_lines ( void )
  47 {
  48         static uint8_t rept;
  49
  50         _delay_us(4);
  51
  52         // Set Busy signal. Line rendering is time-critical.
  53         set_busy(1);
  54         asm_render_line();
  55         set_busy(0);
  56
  57         if( !rept )
  58         {
  59                 if ( buffer_position < ((VRES*hres_bytes)) )
  60                         buffer_position += hres_bytes;
  61                         rept = vres_scale;
  62         }
  63         else rept--;
  64
  65 }
  66
  67 void blank_lines ( void )
  68 {
  69         // Do nothing on the "lead-in" lines
  70         if ( line < FIRST_LINE )
  71                 return;
  72
  73         // Clear Frame Ready signal
  74         PORTD &= ~(uint8_t)(1 << PD5);
  75
  76         // Activate rendering
  77         line_handler = active_lines;
  78 }
  79
  80 ISR (INT1_vect)
  81 {
  82         line_handler();
  83         line++;
  84         if( line > LAST_LINE)
  85         {
  86                 line = 0;
  87                 buffer_position = 0;
  88                 line_handler = &blank_lines;
  89                 EIMSK &= ~(uint8_t)(1<<INT1);
  90
  91                 // Set Frame Ready signal
  92                 PORTD |= (1 << PD5);
  93
  94         }
  95 }
  96
  97 ISR (INT0_vect)
  98 {
  99         // VSync is getting close to done.
 100         // Set line-handler to blank-handler to count-up the undesired lines,
 101         // and enable HSync interrupts.
 102
 103         line_handler = &blank_lines;
 104
 105         EIMSK |= (1<<INT1);
 106
 107 }
 108
 109 //Main Function
 110 int main(void)
 111 {
 112         // Note: PB0 is used as CLKO outputting 20MHz clock to ATtiny
 113
 114         // Set PB2 as Output for BUSY signal
 115         DDRB = (1 << PB1);
 116
 117         // Set PD5 as Output for FR signal
 118         // Set PD6 as Output for Status LED
 119         // Using pin 7 on PD to clock out pixels \o/
 120         DDRD = (1<<PD5)|(1<<PD6)|(1<<PD7);
 121
 122         // Clear PORTB and PORTD
 123         PORTB = 0x0;
 124         PORTD = 0x0;
 125
 126         // Allocate the framebuffer :D
 127         screen_buffer = (uint8_t*) malloc( hres_bytes * VRES * sizeof(uint8_t) );
 128         // And make sure it's cleared
 129         fill(c_BLACK);
 130
 131         /* LM1881 pins are connected to:
 132         INT0 / PCINT18 / PD2 <- VSYNC
 133         INT1 / PCINT19 / PD3 <- CSYNC
 134         PCINT20 / PD4        <- ODD/EVEN
 135         */
 136         EICRA |= (1<<ISC01)|(1<<ISC00); // Select Rising-edge interrupt for VSync
 137         EICRA |= (1<<ISC11)|(1<<ISC10); // Select Rising-edge interrupt for HSync
 138         EIMSK |= (1<<INT0);                     // Enable VSync-interrupts
 139
 140         // Enable interrupts globally.
 141         sei();
 142
 143         // Switch ON status LED
 144         PORTD |= (uint8_t)(1 << PD6);
 145
 146         for (;;)
 147         {
 148                 fill(c_BLACK);
 149                 Delay_ms(100);
 150
 151                 draw_string( 2, 2,  "!\"#$%&'()*+-./");
 152                 draw_string( 2, 10, "01234567890");
 153                 draw_string( 2, 18, ":;<=>?@");
 154                 draw_string( 2, 26, "ABCDEFGHIJKLM");
 155                 draw_string( 2, 34, "NOPQRSTUVWXYZ");
 156                 draw_string( 2, 42, "[\\]^_`");
 157                 draw_string( 2, 50, "ABCDEFGHIJKLM");
 158                 draw_string( 2, 58, "NOPQRSTUVWXYZ");
 159                 draw_string( 2, 66, "{|}~");
 160
 161                 draw_char( 10, 80, 127);
 162                 draw_char( 20, 80, 128);
 163                 draw_char( 30, 80, 129);
 164                 draw_char( 40, 80, 130);
 165
 166                 Delay_ms(500);
 167                 fill(c_BLACK);
 168
 169                 // Do some static drawing :P
 170                 set_pixel(28, 8, 1);
 171                 set_pixel(92, 82, 1);
 172
 173                 set_pixel(92, 8, 1);
 174                 set_pixel(28, 82, 1);
 175
 176                 draw_line(0, 0, 128, 92, c_WHITE);
 177                 draw_line(128, 0, 0, 92, c_WHITE);
 178
 179                 draw_rect( 0, 1, 127, 91, c_WHITE);
 180
 181                 draw_rect( 34, 21, 60, 50, c_WHITE);
 182                 _draw_rect( 24, 11, 80, 70, 1, c_NONE);
 183                 draw_rect( 34, 21, 60, 50, c_WHITE);
 184
 185                 fill_circle( 64,46, 45, c_WHITE );
 186                 fill_circle( 64,46, 40, c_BLACK );
 187
 188                 _draw_circle( 64,46, 35, 1, c_NONE );
 189                 draw_circle( 64,46, 30, c_WHITE );
 190                 fill_rect( 38, 25, 52, 42, c_WHITE);
 191                 fill_rect( 41, 28, 46, 36, c_BLACK);
 192
 193                 for ( int j = 0; j < 92; j++ )
 194                 {
 195                         draw_line(0,0,128,j, c_INVERT);
 196                         draw_line(128,0,0,j, c_INVERT);
 197                         draw_line(0,92,128,92-j, c_INVERT);
 198                         draw_line(128,92,0,92-j, c_INVERT);
 199
 200                         Delay_ms(2);
 201
 202                 }
 203                 for ( int j = 0; j < 92; j++ )
 204                 {
 205                         draw_line(0,0,128,j, c_INVERT);
 206                         draw_line(128,0,0,j, c_INVERT);
 207                         draw_line(0,92,128,92-j, c_INVERT);
 208                         draw_line(128,92,0,92-j, c_INVERT);
 209
 210                         Delay_ms(2);
 211
 212                 }
 213                 Delay_ms(250);
 214                 fill(c_BLACK);
 215
 216                 int8_t hp = 10;
 217                 int8_t vp = 10;
 218
 219                 int counter = 0;
 220                 for (counter = 0; counter < 60; counter++)
 221                 {
 222                         hp += 2;
 223                         vp += 1;
 224
 225                         if ( hp > 125 ) hp = 10;
 226                         if ( vp > VRES ) vp = 10;
 227
 228                         pgm_draw_8bpp_bitmap(hp, vp, testimage_width, testimage_height, testimage);
 229                         Delay_ms(10);
 230                         fill_rect(hp, vp, testimage_width, testimage_height, 0);
 231                 }
 232
 233         }
 234 }
 235