ca84b5dac8
This was mostly lifted from my "tihello" example, but it required significant adjustments. This commit also introduces a font management system. A lot of fonts are available online, but sources aren't always clear so to avoid copyright landmines, I re-created my first 5x7 font from scratch. As it is now, this resulting ROM gets "Collapse OS>" to be displayed on the LCD screen. Much work still left to do. ref #41
97 lines
1.2 KiB
NASM
97 lines
1.2 KiB
NASM
.equ RAMSTART 0x8000
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.equ RAMEND 0xbfff
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.equ PORT_INT_MASK 0x03
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.equ INT_MASK_ON 0x00
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.equ PORT_INT_TRIG 0x04
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.equ INT_TRIG_ON 0x00
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.equ PORT_BANKB 0x07
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jp boot
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.fill 0x18-$
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jp boot ; reboot
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.fill 0x38-$
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jp handleInterrupt
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.fill 0x53-$
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jp boot
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; 0x0056
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.db 0xFF, 0xA5, 0xFF
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.fill 0x64-$
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.inc "err.h"
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.inc "core.asm"
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.equ FNT_WIDTH 5
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.equ FNT_HEIGHT 7
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.inc "fnt/mgm.asm"
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.inc "ti/lcd.asm"
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.inc "ti/kbd.asm"
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.equ STDIO_RAMSTART RAMSTART
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.equ STDIO_GETC GetC
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.equ STDIO_PUTC lcdPutC
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.inc "stdio.asm"
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.inc "parse.asm"
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.equ SHELL_RAMSTART STDIO_RAMEND
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.equ SHELL_EXTRA_CMD_COUNT 0
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.inc "shell.asm"
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boot:
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di
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ld hl, RAMEND
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ld sp, hl
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im 1
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; enable ON key interrupt
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in a, (PORT_INT_MASK)
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set INT_MASK_ON, a
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out (PORT_INT_MASK), a
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ld a, 0x80
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out (PORT_BANKB), a
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ei
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call lcdOff
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; sleep until we press ON
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halt
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main:
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call lcdInit
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xor a
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call lcdSetCol
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call shellInit
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jp shellLoop
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GetC:
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call waitForKey
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jr boot
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handleInterrupt:
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di
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push af
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; did we push the ON button?
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in a, (PORT_INT_TRIG)
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bit INT_TRIG_ON, a
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jp z, .done ; no? we're done
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; yes? acknowledge and boot
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in a, (PORT_INT_MASK)
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res INT_MASK_ON, a ; acknowledge interrupt
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out (PORT_INT_MASK), a
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pop af
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ei
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jp main
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.done:
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pop af
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ei
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reti
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FNT_DATA:
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.bin "fnt/5x7.bin"
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