Add bouncing sprite. First experiment.
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2
const.h
2
const.h
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@ -1,7 +1,7 @@
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#pragma once
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#define VERTICAL_OFFSET 30
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#define HORIZONTAL_OFFSET 192
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#define HORIZONTAL_OFFSET 168
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#define LINE_BUFFER_SIZE 160
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#define BLACK 0x00
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49
main.S
49
main.S
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@ -36,29 +36,14 @@ main_asm:
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1:
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rjmp 1b
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.global int_horizontal_sync
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int_horizontal_sync: ; +3
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push r31 ; +5
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in r31, IO(SREG) ; +6, status register
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push r31 ; +8
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push r30 ; +10
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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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; if (0 <= line < 256), then enter
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lds r30, line ; +12
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lds r31, line + 1 ; +14
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adiw z, 1 ; +16
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sts line, r30 ; +18
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sts line + 1, r31 ; +20
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cpi r31, 0 ; +21
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breq enter ; +23
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jmp int_horizontal_sync_end
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enter:
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; here, +23 cycles have passed since horizontal sync
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; so, there are still ~168 cycles before first useful data
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; load timer to trigger isr at the beginning of the visible scanline
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ldi r31, 0
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sts TCNT0, r31
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ldi r31, HORIZONTAL_OFFSET ; set counter TOP
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lds r31, hpos ; set counter TOP
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sts OCR0A, r31
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ldi r31, 0x7 ; clear any pending interrupt
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@ -68,12 +53,8 @@ enter:
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ori r31, 0x02 ; mask enable interrupt timer A
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sts TIMSK0, r31
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int_horizontal_sync_end:
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pop r30
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pop r31
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out IO(SREG), r31
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pop r31
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reti
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ret
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.global int_timer_0
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int_timer_0:
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@ -83,6 +64,7 @@ int_timer_0:
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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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; turn off interrupt
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lds r31, TIMSK0
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@ -96,11 +78,11 @@ int_timer_0:
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lds zl, current_jump_table
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lds zh, current_jump_table + 1
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; ldi zl, pm_lo8(line_jump_table_0)
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; ldi zh, pm_hi8(line_jump_table_0)
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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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add zl, r29
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adc zh, r0
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add zl, r29
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@ -110,6 +92,7 @@ int_timer_0:
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.global jump_table_return_address
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jump_table_return_address:
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pop r25
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pop r29
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pop r30
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pop r31
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@ -117,8 +100,8 @@ jump_table_return_address:
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pop r31
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reti
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.global int_vertical_sync
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int_vertical_sync:
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.global int_vertical_sync_s
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int_vertical_sync_s:
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push r31
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in r31, IO(SREG)
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push zl
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@ -126,12 +109,6 @@ int_vertical_sync:
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push yl
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push yh
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lds r31, frame + 1
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lds r30, frame
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adiw z, 1
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sts frame + 1, r31
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sts frame, r30
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ldi r30, 1
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ldi r31, 0
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sts line, r30
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39
main.c
39
main.c
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@ -18,14 +18,41 @@ 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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ISR(INT0_vect, ISR_NAKED) {
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// vertical sync interrupt
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asm("jmp int_vertical_sync");
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// horizontal and vertical position of bouncing logo
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volatile uint8_t vpos = 0;
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volatile uint8_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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void int_vertical_sync_s(void);
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ISR(INT0_vect) {
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frame += 1;
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vpos += vinc;
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hpos += hinc;
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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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vinc = -1;
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if (hpos == HORIZONTAL_OFFSET)
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hinc = +1;
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if (hpos == 255 - 40)
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hinc = -1;
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int_vertical_sync_s();
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}
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ISR(INT1_vect, ISR_NAKED) {
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// horizontal sync interrupt
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asm("jmp int_horizontal_sync");
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void int_horizontal_sync_s(void);
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ISR(INT1_vect) {
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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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return;
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if (line >= vpos)
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int_horizontal_sync_s();
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}
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ISR(TIMER0_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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@ -0,0 +1,40 @@
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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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0000000000000000000000000000011000000000000000000000000000000000000001
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1111110000000000000000000000000000011111
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