Code finalization for bouncing sprite.
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17
const.h
17
const.h
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@ -1,8 +1,15 @@
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#pragma once
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#define VERTICAL_OFFSET 30
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#define HORIZONTAL_OFFSET 168
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#define LINE_BUFFER_SIZE 160
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#define FRAME_PIXEL_WIDTH 1024 // [system clock]
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#define FRAME_PIXEL_HEIGHT 256 // [line]
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#define BLACK 0x00
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#define WHITE 0xff
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#define BACK_PORCH_OFFSET 100 // [system clock]
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#define FRONT_PORCH_OFFSET 40 // [system clock]
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#define SPRITE_WIDTH 80 // [system clock]
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#define SPRITE_HEIGHT 64 // [line]
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// Time spent from the horizontal sync pulse,
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// to the first displayed dot.
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// This is given as HSYNC_INT_TUNE + HSYNC_TIMER_TUNE + C part
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#define HSYNC_TUNE 70
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87
main.S
87
main.S
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@ -38,67 +38,76 @@ main_asm:
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.global int_horizontal_sync_s
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int_horizontal_sync_s:
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push r31
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push r30
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push r31 ; +2
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push r30 ; +2
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; load timer to trigger isr at the beginning of the visible scanline
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; reset counter to 0
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ldi r31, 0
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sts TCNT1H, r31
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sts TCNT1L, r31
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ldi r31, 0 ; +1
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sts TCNT1H, r31 ; +2
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sts TCNT1L, r31 ; +2
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; set counter TOP (MSB first!)
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lds r31, hpos + 1
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lds r30, hpos
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sts OCR1AH, r31
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sts OCR1AL, r30
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lds r31, hpos + 1 ; +2
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lds r30, hpos ; +2
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sts OCR1AH, r31 ; +2
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sts OCR1AL, r30 ; +2
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; clear any pending interrupt
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ldi r31, 0x7
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sts TIFR1, r31
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ldi r31, 0x7 ; +1
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sts TIFR1, r31 ; +2
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; enable interrupt timer A
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lds r31, TIMSK1
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ori r31, 0x02
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sts TIMSK1, r31
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lds r31, TIMSK1 ; +2
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ori r31, 0x02 ; +1
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sts TIMSK1, r31 ; +2
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; total: 25
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; HSYNC_INT_TUNE = 25
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; this adds up for HSYNC_TUNE
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pop r30
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pop r31
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ret
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.global int_timer_0
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int_timer_0:
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.global int_timer_1
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int_timer_1:
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; here we are at the beginning of the visible line
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push r31
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in r31, IO(SREG)
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push r31
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push r30
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push r29
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push r25
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; jmp (from C) ; +3
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push r31 ; +2
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in r31, IO(SREG) ; +1
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push r31 ; +2
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push r30 ; +2
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push r29 ; +2
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push r25 ; +2
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; turn off interrupt
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lds r31, TIMSK1
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andi r31, 0xfd ; mask disable interrupt timer A
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sts TIMSK1, r31
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lds r31, TIMSK1 ; +2
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andi r31, 0xfd ; mask disable interrupt timer A, +1
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sts TIMSK1, r31 ; +2
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lds r31, show_image
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cpi r31, 0x1
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brne jump_table_return_address
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lds r31, show_image ; +2
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cpi r31, 0x1 ; +1
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brne jump_table_return_address ; +1 (not taken)
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lds zl, current_jump_table
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lds zh, current_jump_table + 1
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lds zl, current_jump_table ; +2
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lds zh, current_jump_table + 1 ; +2
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clr r0
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lds r29, line
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lds r25, vpos
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sub r29, r25
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clr r0 ; +1
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lds r29, line ; +2
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lds r25, vpos ; +2
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sub r29, r25 ; +1
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add zl, r29
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adc zh, r0
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add zl, r29
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adc zh, r0
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add zl, r29 ; +1
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adc zh, r0 ; +1
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add zl, r29 ; +1
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adc zh, r0 ; +1
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ijmp
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ijmp ; +2
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; total: 39
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; HSYNC_TIMER_TUNE = 39
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; this adds up for HSYNC_TUNE
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.global jump_table_return_address
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jump_table_return_address:
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32
main.c
32
main.c
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@ -18,35 +18,46 @@ volatile uint16_t frame = 0;
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volatile uint16_t line = 0xfe;
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volatile uint8_t image = 0xff;
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// horizontal and vertical position of bouncing logo
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// horizontal and vertical position
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// (and current increments)
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// of bouncing sprite
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volatile uint8_t vpos = 0;
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volatile uint16_t hpos = 0;
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volatile int8_t vinc = +1;
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volatile int8_t hinc = +1;
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// vertical sync interrupt
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void int_vertical_sync_s(void);
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ISR(INT0_vect) {
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// count frames
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frame += 1;
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// move sprite
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vpos += vinc;
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hpos += hinc;
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// invert bouncing direction
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if (vpos == 0)
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vinc = +1;
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if (vpos == 256 - 64)
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if (vpos == FRAME_PIXEL_HEIGHT - SPRITE_HEIGHT)
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vinc = -1;
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if (hpos == HORIZONTAL_OFFSET)
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if (hpos == BACK_PORCH_OFFSET)
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hinc = +1;
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if (hpos == 1024 - 80)
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if (hpos ==
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FRAME_PIXEL_WIDTH - SPRITE_WIDTH - FRONT_PORCH_OFFSET - HSYNC_TUNE)
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hinc = -1;
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int_vertical_sync_s();
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}
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// horizontal sync interrupt
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void int_horizontal_sync_s(void);
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ISR(INT1_vect) {
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// count lines
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line += 1;
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// if (line >= 256)
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if (line >= vpos + 64)
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// we are past the last line of the sprite
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if (line >= vpos + SPRITE_HEIGHT)
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return;
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if (line >= vpos)
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@ -54,8 +65,8 @@ ISR(INT1_vect) {
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}
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ISR(TIMER1_COMPA_vect, ISR_NAKED) {
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// back porch timer interrupt
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asm("jmp int_timer_0");
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// end-of back porch timer interrupt
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asm("jmp int_timer_1");
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}
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// external assembly main loop
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@ -76,10 +87,5 @@ int main() {
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TCCR1A = 0x00; // don't connect output pins to timer, CTC[1:0] mode
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TCCR1B = 0x09; // CTC[3:2] mode, no prescaler
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#if 0
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TCCR0A = 0x02; // don't connect output pins to timer, CTC[1:0] mode
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TCCR0B = 0x01; // CTC[2] mode, no prescaler
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#endif
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main_asm();
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}
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@ -1,23 +1,6 @@
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P1
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# Created by GIMP version 2.10.32 PNM plug-in
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40 64
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@ -31,10 +14,64 @@ P1
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