154 lines
2.3 KiB
ArmAsm
154 lines
2.3 KiB
ArmAsm
/* M68HC11/M68HC12 serial line operations
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* Copyright (C) 1999, 2001, 2003, 2004 Stephane Carrez (stcarrez@nerim.fr)
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice is included verbatim in any distributions. No written agreement,
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* license, or royalty fee is required for any of the authorized uses.
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* Modifications to this software may be copyrighted by their authors
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* and need not follow the licensing terms described here, provided that
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* the new terms are clearly indicated on the first page of each file where
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* they apply.
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*/
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#ifdef __HAVE_SHORT_INT__
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.mode mshort
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#else
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.mode mlong
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#endif
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#if defined(__USE_RTC__)
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.macro ret
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#if defined(mc68hc12)
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rtc
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#else
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jmp __return_32
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#endif
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.endm
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#else
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.macro ret
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rts
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.endm
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#endif
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#ifdef mc68hc12
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SC0CR1 = 0xC2
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SC0CR2 = 0xC3
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SC0SR1 = 0xC4
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SC0DRL = 0xC7
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SC0BD = 0xC0
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.sect .data
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.globl _m68hc12_ports
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_m68hc12_ports: .word 0
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.sect .text
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.globl outbyte
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;;;
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;;; int outbyte(char c);
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;;;
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;;; B : Character to send
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;;;
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outbyte:
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bsr _sci_init
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L1:
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ldaa SC0SR1,x
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bge L1
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stab SC0DRL,x
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ldab SC0CR2,x
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orab #0x8
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stab SC0CR2,x
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ret
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.sect .text
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.globl inbyte
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;;;
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;;; char inbyte(void);
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;;;
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inbyte:
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bsr _sci_init
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ldaa SC0SR1,x
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bita #0x20
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beq inbyte
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ldab SC0CR2,x
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ret
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.globl _sci_init
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.sect .text
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_sci_init:
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ldx _m68hc12_ports
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beq do_init
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dex
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rts
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do_init:
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ldx #0x1
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stx _m68hc12_ports
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dex
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ldd #26
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std SC0BD,x
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ldaa #0
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staa SC0CR1,x
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ldaa #0xC
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staa SC0CR2,x
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rts
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#else
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BAUD = 0x2b
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SCCR1= 0x2c
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SCCR2= 0x2d
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SCSR = 0x2e
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SCDR = 0x2f
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.sect .data
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.globl _m68hc11_ports
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_m68hc11_ports: .word 0
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.sect .text
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.globl outbyte
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;;;
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;;; int outbyte(char c);
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;;;
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;;; B : Character to send
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;;;
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outbyte:
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bsr _sci_init
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L1:
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ldaa SCSR,x
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bge L1
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stab SCDR,x
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ldab SCCR2,x
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orab #0x8
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stab SCCR2,x
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ret
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.sect .text
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.globl inbyte
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;;;
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;;; char inbyte(void);
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;;;
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inbyte:
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bsr _sci_init
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ldaa SCSR,x
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bita #0x20
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beq inbyte
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ldab SCDR,x
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ret
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.globl _sci_init
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.sect .text
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_sci_init:
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ldx _m68hc11_ports
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beq do_init
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rts
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do_init:
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ldx #0x1000
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stx _m68hc11_ports
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ldaa #0x30
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staa BAUD,x
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clra
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staa SCCR1,x
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ldaa #0xC
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staa SCCR2,x
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rts
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#endif
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