Last change
on this file since 474 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
|
File size:
2.3 KB
|
Rev | Line | |
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[444] | 1 | /* M68HC11/M68HC12 serial line operations |
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| 2 | * Copyright (C) 1999, 2001, 2003, 2004 Stephane Carrez (stcarrez@nerim.fr) |
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| 3 | * |
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| 4 | * The authors hereby grant permission to use, copy, modify, distribute, |
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| 5 | * and license this software and its documentation for any purpose, provided |
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| 6 | * that existing copyright notices are retained in all copies and that this |
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| 7 | * notice is included verbatim in any distributions. No written agreement, |
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| 8 | * license, or royalty fee is required for any of the authorized uses. |
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| 9 | * Modifications to this software may be copyrighted by their authors |
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| 10 | * and need not follow the licensing terms described here, provided that |
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| 11 | * the new terms are clearly indicated on the first page of each file where |
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| 12 | * they apply. |
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| 13 | */ |
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| 14 | |
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| 15 | #ifdef __HAVE_SHORT_INT__ |
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| 16 | .mode mshort |
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| 17 | #else |
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| 18 | .mode mlong |
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| 19 | #endif |
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| 20 | |
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| 21 | #if defined(__USE_RTC__) |
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| 22 | .macro ret |
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| 23 | #if defined(mc68hc12) |
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| 24 | rtc |
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| 25 | #else |
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| 26 | jmp __return_32 |
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| 27 | #endif |
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| 28 | .endm |
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| 29 | #else |
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| 30 | .macro ret |
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| 31 | rts |
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| 32 | .endm |
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| 33 | #endif |
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| 34 | #ifdef mc68hc12 |
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| 35 | SC0CR1 = 0xC2 |
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| 36 | SC0CR2 = 0xC3 |
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| 37 | SC0SR1 = 0xC4 |
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| 38 | SC0DRL = 0xC7 |
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| 39 | SC0BD = 0xC0 |
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| 40 | |
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| 41 | .sect .data |
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| 42 | .globl _m68hc12_ports |
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| 43 | _m68hc12_ports: .word 0 |
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| 44 | |
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| 45 | .sect .text |
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| 46 | .globl outbyte |
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| 47 | ;;; |
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| 48 | ;;; int outbyte(char c); |
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| 49 | ;;; |
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| 50 | ;;; B : Character to send |
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| 51 | ;;; |
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| 52 | outbyte: |
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| 53 | bsr _sci_init |
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| 54 | L1: |
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| 55 | ldaa SC0SR1,x |
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| 56 | bge L1 |
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| 57 | stab SC0DRL,x |
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| 58 | ldab SC0CR2,x |
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| 59 | orab #0x8 |
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| 60 | stab SC0CR2,x |
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| 61 | ret |
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| 62 | |
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| 63 | .sect .text |
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| 64 | .globl inbyte |
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| 65 | ;;; |
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| 66 | ;;; char inbyte(void); |
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| 67 | ;;; |
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| 68 | inbyte: |
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| 69 | bsr _sci_init |
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| 70 | ldaa SC0SR1,x |
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| 71 | bita #0x20 |
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| 72 | beq inbyte |
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| 73 | ldab SC0CR2,x |
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| 74 | ret |
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| 75 | |
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| 76 | .globl _sci_init |
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| 77 | .sect .text |
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| 78 | _sci_init: |
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| 79 | ldx _m68hc12_ports |
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| 80 | beq do_init |
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| 81 | dex |
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| 82 | rts |
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| 83 | do_init: |
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| 84 | ldx #0x1 |
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| 85 | stx _m68hc12_ports |
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| 86 | dex |
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| 87 | ldd #26 |
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| 88 | std SC0BD,x |
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| 89 | ldaa #0 |
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| 90 | staa SC0CR1,x |
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| 91 | ldaa #0xC |
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| 92 | staa SC0CR2,x |
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| 93 | rts |
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| 94 | #else |
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| 95 | BAUD = 0x2b |
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| 96 | SCCR1= 0x2c |
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| 97 | SCCR2= 0x2d |
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| 98 | SCSR = 0x2e |
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| 99 | SCDR = 0x2f |
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| 100 | |
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| 101 | .sect .data |
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| 102 | .globl _m68hc11_ports |
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| 103 | _m68hc11_ports: .word 0 |
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| 104 | |
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| 105 | .sect .text |
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| 106 | .globl outbyte |
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| 107 | ;;; |
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| 108 | ;;; int outbyte(char c); |
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| 109 | ;;; |
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| 110 | ;;; B : Character to send |
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| 111 | ;;; |
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| 112 | outbyte: |
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| 113 | bsr _sci_init |
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| 114 | L1: |
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| 115 | ldaa SCSR,x |
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| 116 | bge L1 |
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| 117 | stab SCDR,x |
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| 118 | ldab SCCR2,x |
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| 119 | orab #0x8 |
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| 120 | stab SCCR2,x |
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| 121 | ret |
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| 122 | |
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| 123 | .sect .text |
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| 124 | .globl inbyte |
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| 125 | ;;; |
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| 126 | ;;; char inbyte(void); |
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| 127 | ;;; |
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| 128 | inbyte: |
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| 129 | bsr _sci_init |
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| 130 | ldaa SCSR,x |
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| 131 | bita #0x20 |
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| 132 | beq inbyte |
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| 133 | ldab SCDR,x |
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| 134 | ret |
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| 135 | |
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| 136 | .globl _sci_init |
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| 137 | .sect .text |
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| 138 | _sci_init: |
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| 139 | ldx _m68hc11_ports |
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| 140 | beq do_init |
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| 141 | rts |
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| 142 | do_init: |
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| 143 | ldx #0x1000 |
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| 144 | stx _m68hc11_ports |
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| 145 | ldaa #0x30 |
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| 146 | staa BAUD,x |
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| 147 | clra |
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| 148 | staa SCCR1,x |
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| 149 | ldaa #0xC |
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| 150 | staa SCCR2,x |
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| 151 | rts |
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| 152 | |
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| 153 | #endif |
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