1
0
mirror of https://github.com/KarolS/millfork.git synced 2024-12-24 15:29:23 +00:00
millfork/include/stdlib_6502.mfk
Karol Stasiak 63ff28e94e Changes to macros and parameter list syntax:
* non-asm macros can now take `const` and `call` parameters
* register parameters to asm functions and macros can be given names if annotated explicitly
2020-03-30 19:23:48 +02:00

55 lines
877 B
Plaintext

// target-independent things
#if not(ARCH_6502)
#warn stdlib_6502 module should be only used on 6502-compatible targets
#endif
word nmi_routine_addr @$FFFA
word reset_routine_addr @$FFFC
word irq_routine_addr @$FFFE
macro asm void poke(word const addr, byte register(a) value) {
! STA addr
}
macro asm byte peek(word const addr) {
! LDA addr
}
macro asm void disable_irq() {
SEI
}
macro asm void enable_irq() {
CLI
}
asm byte hi_nibble_to_hex(byte register(a) value) {
LSR
LSR
LSR
LSR
? JMP lo_nibble_to_hex
}
asm byte lo_nibble_to_hex(byte register(a) value) {
! AND #$F
CLC
ADC #$30
CMP #$3A
BCC _lo_nibble_to_hex_lbl
ADC #$6 // carry is set
_lo_nibble_to_hex_lbl:
? RTS
}
macro asm void panic() {
? JSR _panic
}
const array __constant8 = [8]
#if ZPREG_SIZE < 4
const array call = [2]
#endif