Fujitsu F2MC-16L - 3.3 Example of Creating a Standard I;O Driver

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3.3 Example of Creating a Standard I/O Driver
3.3 Example of Creating a Standard I/O Driver
Figure 3.3 shows an example of how to incorporate a standard I/O driver.
■ Example of creating a standard I/O driver
.program mb89371
.title mb89371
#include scdef_s.inc
IO .section IO_mb89371, IO, LOCATE=H’C0
;MB89371
RS_DATA .res.b 1 ;h'C0 data register
.res.b 1
RS_CTRL .res.b 1 ;h'C2 control register
.res.b 1
RS_BOUD .res.b 1 ;h'C4 371 baud rate register
.res.b 1
RS_CTRL1 .res.b ;h'C6 371 mode register
CSEG .section CODE_mb89371, CODE, ALIGN=2
;----------------------------------------
; Define entry
;----------------------------------------
.export _stdout, _stdin
_stdout .data.l chrout
_stdin .data.l chrinp
;---------------------------------------------------
; Serial data transmitter/receiver_iSDTR_FMB89371)
RCLR .equ H'40 ; error reset
RMODE .equ B'01001111 ; mode (8251 compatible)
RMODE1 .equ B'01000010 ; mode (8251 compatible)
RBOUD .equ B'00000010 ; 9600bps
RCOMM .equ B'00010101 ; receive&transmit
RSERR .equ B'00111000 ; pattern of error
RXRDY .equ 1 ; status bit of receiver
TXRDY .equ 0 ; status bit of transmission
UsartAccessDelayTime .equ10 ; wait time
;---------------------------------------------------
; _uart_init(MB89371 initialize)
;
; *PARAMETER*
; None
; *RETURN*
; None
; *ERROR CODE*
; None
;---------------------------------------------------
.export _uart_init
_uart_init:
mov i:RS_CTRL, #0 ; MB89371 reset
call delay
mov i:RS_CTRL, #0
call delay
mov i:RS_CTRL, #0
call delay
Figure 3.3 Example of Creating a Standard I/O Driver (Continued...)
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