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NEC PC-6001 support sources are initially added.

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matsutsuka 2007-09-11 12:12:59 +00:00
parent c258a2e83a
commit 6dd93a3d04
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platform/pc-6001/dev/rs232-asm.S Normal file
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;;;
;;;
;;; rs232-asm.S
;;;
;;; PC-6001 Architecture depend RS-232C implementation,
;;; uses a bunch of BIOS functions.
;;;
;;; @author Takahide Matsutsuka <markn@markn.org>
;;;
;;; $Id: rs232-asm.S,v 1.1 2007/09/11 12:12:59 matsutsuka Exp $
;;;
;; definitions of PC-6001 BIOS routines
_rs232c_initialize = 0x19bf
_rs232c_char_output = 0x19e8
_char_input_sub = 0x2642
_rs232c_interrupt_sub = 0x0f64
;; export symbols
.globl _rs232_arch_writeb
.globl _rs232_arch_poll
.globl _rs232_arch_init
.area _CODE
;; ---------------------------------
;; void rs232_writeb(u8_t c)
;; Stack; retl reth c
;; AFBC__HL____
;; return void
;; ---------------------------------
_rs232_arch_writeb:
ld hl, #2
add hl, sp
ld a, (hl)
call _rs232c_char_output
ret
;; ---------------------------------
;; unsigned char rs232_arch_poll();
;; Stack; retl reth
;; AFBC__HL____
;; return input byte (zero if no input)
;; ---------------------------------
_rs232_arch_poll:
ld a,#0x01
di
call #_char_input_sub ; read from buffer
ei
jr nz, _rs232_arch_poll_ret
xor a ; we have no data in the buffer
_rs232_arch_poll_ret:
ld l, a
ret
;; ---------------------------------
;; void rs232_init(unsigned long ubr);
;; Stack; retl reth ubr1 ubr2 ubr3 ubr4
;; AFB_DEHL____
;; return void
;; ---------------------------------
_rs232_arch_init:
ld b, #0x4f
call _rs232c_initialize
ret