source: trunk/libs/newlib/src/libgloss/m68hc11/sci-inout.S @ 498

Last change on this file since 498 was 444, checked in by satin@…, 7 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
File size: 2.3 KB
Line 
1/* M68HC11/M68HC12 serial line operations
2 * Copyright (C) 1999, 2001, 2003, 2004 Stephane Carrez (stcarrez@nerim.fr)
3 *
4 * The authors hereby grant permission to use, copy, modify, distribute,
5 * and license this software and its documentation for any purpose, provided
6 * that existing copyright notices are retained in all copies and that this
7 * notice is included verbatim in any distributions. No written agreement,
8 * license, or royalty fee is required for any of the authorized uses.
9 * Modifications to this software may be copyrighted by their authors
10 * and need not follow the licensing terms described here, provided that
11 * the new terms are clearly indicated on the first page of each file where
12 * they apply.
13 */
14
15#ifdef __HAVE_SHORT_INT__
16        .mode mshort
17#else
18        .mode mlong
19#endif
20
21#if defined(__USE_RTC__)
22        .macro ret
23#if defined(mc68hc12)
24        rtc
25#else
26        jmp __return_32
27#endif
28        .endm
29#else
30        .macro ret
31        rts
32        .endm
33#endif
34#ifdef mc68hc12
35        SC0CR1 = 0xC2
36        SC0CR2 = 0xC3
37        SC0SR1 = 0xC4
38        SC0DRL = 0xC7
39        SC0BD  = 0xC0
40
41        .sect .data
42        .globl _m68hc12_ports
43_m68hc12_ports: .word   0
44
45        .sect .text
46        .globl outbyte
47;;;
48;;; int outbyte(char c);
49;;;
50;;; B : Character to send
51;;;
52outbyte:
53        bsr     _sci_init
54L1:
55        ldaa    SC0SR1,x
56        bge     L1
57        stab    SC0DRL,x
58        ldab    SC0CR2,x
59        orab    #0x8
60        stab    SC0CR2,x
61        ret
62
63        .sect .text
64        .globl inbyte
65;;;
66;;; char inbyte(void);
67;;;
68inbyte:
69        bsr     _sci_init
70        ldaa    SC0SR1,x
71        bita    #0x20
72        beq     inbyte
73        ldab    SC0CR2,x
74        ret
75
76        .globl _sci_init
77        .sect .text
78_sci_init:
79        ldx     _m68hc12_ports
80        beq     do_init
81        dex
82        rts
83do_init:
84        ldx     #0x1
85        stx     _m68hc12_ports
86        dex
87        ldd     #26
88        std     SC0BD,x
89        ldaa    #0
90        staa    SC0CR1,x
91        ldaa    #0xC
92        staa    SC0CR2,x
93        rts
94#else   
95        BAUD = 0x2b
96        SCCR1= 0x2c
97        SCCR2= 0x2d
98        SCSR = 0x2e
99        SCDR = 0x2f
100
101        .sect .data
102        .globl _m68hc11_ports
103_m68hc11_ports: .word   0
104
105        .sect .text
106        .globl outbyte
107;;;
108;;; int outbyte(char c);
109;;;
110;;; B : Character to send
111;;;
112outbyte:
113        bsr     _sci_init
114L1:
115        ldaa    SCSR,x
116        bge     L1
117        stab    SCDR,x
118        ldab    SCCR2,x
119        orab    #0x8
120        stab    SCCR2,x
121        ret
122
123        .sect .text
124        .globl inbyte
125;;;
126;;; char inbyte(void);
127;;;
128inbyte:
129        bsr     _sci_init
130        ldaa    SCSR,x
131        bita    #0x20
132        beq     inbyte
133        ldab    SCDR,x
134        ret
135
136        .globl _sci_init
137        .sect .text
138_sci_init:
139        ldx     _m68hc11_ports
140        beq     do_init
141        rts
142do_init:
143        ldx     #0x1000
144        stx     _m68hc11_ports
145        ldaa    #0x30
146        staa    BAUD,x
147        clra
148        staa    SCCR1,x
149        ldaa    #0xC
150        staa    SCCR2,x
151        rts
152
153#endif
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