Last change
on this file since 580 was
444,
checked in by satin@…, 7 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
2.3 KB
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Line | |
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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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