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annotate level1/modules/clock2_ds1315.asm @ 1917:8f11fa36d5d8

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Fixed address offsets for SuperBoard
author boisy
date Thu, 24 Nov 2005 14:02:52 +0000
parents 9d95e3246a61
children 40bb5c3d1c15
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1 ********************************************************************
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2 * Clock2 - Dallas Semiconductor DS1315 RTC Driver
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3 *
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4 * $Id$
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5 *
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6 * The Burke & Burke HD Controller as well as Cloud-9's products
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7 * use the DS1315.
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8 *
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9 * Edt/Rev YYYY/MM/DD Modified by
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10 * Comment
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11 * ------------------------------------------------------------------
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12 * 1 2004/08/18 Boisy G. Pitre
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13 * Separated clock2 modules for source clarity.
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14
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15 nam Clock2
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16 ttl Dallas Semiconductor DS1315 RTC Driver
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17
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18 ifp1
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19 use defsfile
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20 endc
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21
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22 tylg set Sbrtn+Objct
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23 atrv set ReEnt+rev
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24 rev set $00
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25 edition set 1
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26
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27 IFNE BNB
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28 RTC.Base equ $FF5C In SCS* Decode
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29 ELSE
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30 IFNE SUPERBOARD
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31 RTC.Base equ SBRTCBase
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8f11fa36d5d8 Fixed address offsets for SuperBoard
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32 RTC.Zero equ 0 Send zero bit by writing this offset
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33 RTC.One equ 1 Send one bit by writing this offset
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34 RTC.Read equ 2 Read data from this offset
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35 ELSE
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36 RTC.Base equ $FF7C Fully decoded RTC
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37 RTC.Zero equ -4 Send zero bit by writing this offset
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38 RTC.One equ -3 Send one bit by writing this offset
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39 RTC.Read equ 0 Read data from this offset
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40 ENDC
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41 ENDC
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42
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43
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44 mod eom,name,tylg,atrv,JmpTable,RTC.Base
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45
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46 name fcs "Clock2"
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47 fcb edition
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48
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49 IFNE MPIFlag
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50 SlotSlct fcb MPI.Slot-1 Slot constant for MPI select code
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51 ENDC
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52
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53 JmpTable
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54 rts
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55 nop
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56 nop
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57 bra GetTime
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58 nop
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59
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60 SetTime pshs u,y,cc
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61 leay SendBCD,pcr Send bytes of clock
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62 bra TfrTime
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63
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64 GetTime pshs u,y,cc
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65 leay ReadBCD,pcr Read bytes of clock
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66
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67 TfrTime orcc #IntMasks turn off interrupts
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68 ldu M$Mem,pcr Get base address
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69
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70 IFNE MPIFlag
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71 ldb >MPI.Slct Select slot
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72 pshs b
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73 andb #$F0
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74 orb SlotSlct,pcr
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75 stb >MPI.Slct
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76 ENDC
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77
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78 lbsr SendMsg Initialize clock
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79 ldx #D.Sec
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80 ldb #8 Tfr 8 bytes
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81
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82 tfrloop jsr ,y Tfr 1 byte
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83
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84 bitb #$03
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85 beq skipstuf Skip over day-of-week, etc.
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86 leax -1,x
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87 skipstuf decb
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88 bne tfrloop
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89
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90 IFNE MPIFlag
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91 puls b
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92 stb >MPI.Slct restore MPAK slot
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93 ENDC
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94
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95 puls u,y,cc,pc
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96
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97 ClkMsg fcb $C5,$3A,$A3,$5C,$C5,$3A,$A3,$5C
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98 * Enable clock with message $C53AA35CC53AA35C
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99 SendMsg lda RTC.Read,u Send Initialization message to clock
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100 leax <ClkMsg,pcr
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101 ldb #8
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102 msgloop lda ,x+
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103 bsr SendByte
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104 decb
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105 bne msgloop
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106 rts
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107
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108 SendBCD pshs b Send byte to clock, first converting to BCD
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109 bitb #$03
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110 bne BCDskip Send zero for day-of-week, etc.
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111 lda #0
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112 bra SndBCDGo
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113 BCDskip lda ,x
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114 SndBCDGo tfr a,b
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115 bra binenter
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116 binloop adda #6
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117 binenter subb #10
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118 bhs binloop
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119 puls b
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120 SendByte coma Send one byte to clock
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121 rora
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122 bcc sendone
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123 sendzero tst RTC.Zero,u
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124 lsra
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125 bcc sendone
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126 bne sendzero
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127 rts
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128 sendone tst RTC.One,u
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129 lsra
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130 bcc sendone
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131 bne sendzero
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132 rts
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133
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134 ReadBCD pshs b
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135 ldb #$80 High bit will rotate out after we read 8 bits
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136 readbit lda RTC.Read,u Read a bit
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137 lsra
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138 rorb Shift it into B
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139 bcc readbit Stop when marker bit appears
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140 tfr b,a
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141 bra BCDEnter Convert BCD number to Binary
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142 BCDLoop subb #6 by subtracting 6 for each $10
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143 BCDEnter suba #$10
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144 bhs BCDLoop
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145 stb ,x
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146 puls b,pc
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147
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149
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150 emod
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151 eom equ *
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152 end
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153