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annotate level1/modules/clock2_ds1315.asm @ 2743:b44abaa5da88

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Found that the lib folder was not being processed. Corrected issue.
author drencor-xeen
date Tue, 08 Jan 2013 14:01:56 -0600
parents 40bb5c3d1c15
children
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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 RTC.Zero equ -4 Send zero bit by writing this offset
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30 RTC.One equ -3 Send one bit by writing this offset
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31 RTC.Read equ 0 Read data from this offset
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32 ELSE
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33 IFNE SUPERBOARD
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34 RTC.Base equ SBRTCBase
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35 RTC.Zero equ 0 Send zero bit by writing this offset
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36 RTC.One equ 1 Send one bit by writing this offset
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37 RTC.Read equ 2 Read data from this offset
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38 ELSE
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39 RTC.Base equ $FF7C Fully decoded RTC
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40 RTC.Zero equ -4 Send zero bit by writing this offset
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41 RTC.One equ -3 Send one bit by writing this offset
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42 RTC.Read equ 0 Read data from this offset
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43 ENDC
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44 ENDC
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46
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47 mod eom,name,tylg,atrv,JmpTable,RTC.Base
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48
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49 name fcs "Clock2"
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50 fcb edition
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51
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52 IFNE MPIFlag
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53 SlotSlct fcb MPI.Slot-1 Slot constant for MPI select code
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54 ENDC
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55
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56 JmpTable
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57 rts
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58 nop
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59 nop
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60 bra GetTime
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61 nop
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62
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63 SetTime pshs u,y,cc
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64 leay SendBCD,pcr Send bytes of clock
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65 bra TfrTime
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66
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67 GetTime pshs u,y,cc
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68 leay ReadBCD,pcr Read bytes of clock
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69
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70 TfrTime orcc #IntMasks turn off interrupts
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71 ldu M$Mem,pcr Get base address
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72
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73 IFNE MPIFlag
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74 ldb >MPI.Slct Select slot
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75 pshs b
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76 andb #$F0
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77 orb SlotSlct,pcr
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78 stb >MPI.Slct
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79 ENDC
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80
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81 lbsr SendMsg Initialize clock
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82 ldx #D.Sec
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83 ldb #8 Tfr 8 bytes
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84
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85 tfrloop jsr ,y Tfr 1 byte
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86
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87 bitb #$03
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88 beq skipstuf Skip over day-of-week, etc.
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89 leax -1,x
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90 skipstuf decb
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91 bne tfrloop
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92
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93 IFNE MPIFlag
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94 puls b
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95 stb >MPI.Slct restore MPAK slot
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96 ENDC
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97
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98 puls u,y,cc,pc
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99
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100 ClkMsg fcb $C5,$3A,$A3,$5C,$C5,$3A,$A3,$5C
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101 * Enable clock with message $C53AA35CC53AA35C
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102 SendMsg lda RTC.Read,u Send Initialization message to clock
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103 leax <ClkMsg,pcr
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104 ldb #8
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105 msgloop lda ,x+
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106 bsr SendByte
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107 decb
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108 bne msgloop
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109 rts
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110
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111 SendBCD pshs b Send byte to clock, first converting to BCD
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112 bitb #$03
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113 bne BCDskip Send zero for day-of-week, etc.
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114 lda #0
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115 bra SndBCDGo
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116 BCDskip lda ,x
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117 SndBCDGo tfr a,b
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118 bra binenter
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119 binloop adda #6
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120 binenter subb #10
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121 bhs binloop
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122 puls b
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123 SendByte coma Send one byte to clock
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124 rora
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125 bcc sendone
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126 sendzero tst RTC.Zero,u
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127 lsra
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128 bcc sendone
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129 bne sendzero
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130 rts
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131 sendone tst RTC.One,u
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132 lsra
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133 bcc sendone
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134 bne sendzero
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135 rts
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136
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137 ReadBCD pshs b
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138 ldb #$80 High bit will rotate out after we read 8 bits
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139 readbit lda RTC.Read,u Read a bit
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140 lsra
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141 rorb Shift it into B
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142 bcc readbit Stop when marker bit appears
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143 tfr b,a
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144 bra BCDEnter Convert BCD number to Binary
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145 BCDLoop subb #6 by subtracting 6 for each $10
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146 BCDEnter suba #$10
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147 bhs BCDLoop
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148 stb ,x
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149 puls b,pc
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150
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152
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153 emod
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154 eom equ *
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155 end
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156