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annotate level1/modules/clock2_elim.asm @ 1724:f389c6bca482

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New clock2_*.asm files split from single clock2.asm for more source clarity
author boisy
date Fri, 20 Aug 2004 11:11:58 +0000
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1724
f389c6bca482 New clock2_*.asm files split from single clock2.asm for more source clarity
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1 ********************************************************************
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2 * Clock2 - Eliminator RTC Driver
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3 *
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4 * $Id$
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5 *
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6 * Edt/Rev YYYY/MM/DD Modified by
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7 * Comment
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8 * ------------------------------------------------------------------
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9 * 1 2004/08/18 Boisy G. Pitre
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10 * Separated clock2 modules for source clarity.
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11
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12 nam Clock2
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13 ttl Eliminator RTC Driver
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14
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15 ifp1
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16 use defsfile
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17 endc
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18
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19 tylg set Sbrtn+Objct
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20 atrv set ReEnt+rev
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21 rev set $00
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22 edition set 1
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23
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24 RTC.Sped equ $20 32.768 KHz, rate=0
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25 RTC.Strt equ $06 binary, 24 Hour, DST disabled
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26 RTC.Stop equ $86 bit 7 set stops clock to allow setting time
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27 RTC.Base equ $FF72 I don't know base for this chip.
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28
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29 mod eom,name,tylg,atrv,JmpTable,RTC.Base
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30
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31 name fcs "Clock2"
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32 fcb edition
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33
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34 JmpTable
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35 lbra Init
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36 bra GetTime
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37 nop
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38 lbra SetTime
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39
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40
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41 GetTime ldx M$Mem,pcr get RTC base address from fake memory requirement
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42 ldb #$0A UIP status register address
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43 stb ,x generate address strobe
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44 lda 1,x get UIP status
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45 bpl NoUIP Update In Progress, go shift next RTC read
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46 lda #TkPerSec/2 set up next RTC read attempt in 1/2 second
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47 sta <D.Tick save tick
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48 bra UpdTExit and return
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49
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50 NoUIP decb year register address
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51 stb ,x generate address strobe
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52 lda 1,x get year
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53 sta <D.Year
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54 decb month register address
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55 stb ,x
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56 lda 1,x
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57 sta <D.Month
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58 decb day of month register address
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59 stb ,x
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60 lda 1,x
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61 sta <D.Day
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62 ldb #4 hour register address
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63 stb ,x
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64 lda 1,x
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65 sta <D.Hour
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66 ldb #2 minute register address
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67 stb ,x
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68 lda 1,x
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69 sta <D.Min
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70 clrb second register address
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71 stb ,x
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72 lda 1,x
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73 SaveSec sta <D.Sec
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74 UpdTExit rts
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75
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76
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77
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78 SetTime pshs cc save interrupt status
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79 orcc #IntMasks disable IRQs
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80 ldx M$Mem,pcr get RTC base address from fake memory requirement
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81 ldy #D.Time point [Y] to time variables in DP
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82 ldd #$0B*256+RTC.Stop
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83 bsr UpdatCk0 stop clock before setting it
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84 ldb #RTC.Sped
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85 bsr UpdatCk0 set crystal speed, output rate
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86 bsr UpdatClk go set year
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87 bsr UpdatClk go set month
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88 bsr UpdatClk go set day of month
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89 bsr UpdatCk0 go set day of week (value doesn't matter)
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90 bsr UpdatCk0 go set hours alarm (value doesn't matter)
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91 bsr UpdatClk go set hour
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92 bsr UpdatCk0 go set minutes alarm (value doesn't matter)
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93 bsr UpdatClk go set minute
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94 bsr UpdatCk0 go set seconds alarm (value doesn't matter)
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95 bsr UpdatClk go set second
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96 ldd #$0B*256+RTC.Strt
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97 bsr UpdatCk0 go start clock
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98 puls cc Recover IRQ status
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99 clrb
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100 rts
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101
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102 UpdatClk ldb ,y+ get data from D.Time variables in DP
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103 UpdatCk0 std ,x generate address strobe, save data
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104 deca set [A] to next register down
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105 rts
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106
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107 IFGT Level-1
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108 * OS-9 Level Two code only (for now)
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109 NewSvc fcb F$NVRAM Eliminator adds one new service call
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110 fdb F.NVRAM-*-2
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111 fcb $80 end of service call installation table
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112
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113 *------------------------------------------------------------
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114 * read/write RTC Non Volatile RAM (NVRAM)
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115 *
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116 * INPUT: [U] = pointer to caller's register stack
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117 * R$A = access mode (1 = read, 2 = write, other = error)
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118 * R$B = byte count (1 through 50 here, but in other implementations
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119 * may be 1 through 256 where 0 implies 256)
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120 * R$X = address of buffer in user map
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121 * R$Y = start address in NVRAM
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122 *
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123 * OUTPUT: RTC NVRAM read/written
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124 *
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125 * ERROR OUTPUT: [CC] = Carry set
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126 * [B] = error code
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127 F.NVRAM tfr u,y copy caller's register stack pointer
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128 ldd #$0100 ask for one page
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129 os9 F$SRqMem
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130 bcs NVR.Exit go report error...
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131 pshs y,u save caller's stack and data buffer pointers
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132 ldx R$Y,y get NVRAM start address
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133 cmpx #50 too high?
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134 bhs Arg.Err yes, go return error...
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135 ldb R$B,y get NVRAM byte count
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136 beq Arg.Err
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137 abx check end address
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138 cmpx #50 too high?
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139 bhi Arg.Err yes, go return error...
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140 lda R$A,y get direction flag
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141 cmpa #WRITE. put caller's data into NVRAM?
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142 bne ChkRead no, go check if read...
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143 clra [D]=byte count
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144 pshs d save it...
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145 ldx <D.Proc get caller's process descriptor address
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146 lda P$Task,x caller is source task
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147 ldb <D.SysTsk system is destination task
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148 ldx R$X,y get caller's source pointer
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149 puls y recover byte count
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150 os9 F$Move go MOVE data
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151 bcs NVR.Err
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152 ldy ,s get caller's register stack pointer from stack
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153 lda R$Y+1,y get NVRAM start address
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154 adda #$0E add offset to first RTC NVRAM address
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155 ldb R$B,y get byte count
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156 ldx M$Mem,pcr get clock base address from fake memory requirement
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157 pshs cc,b save IRQ enable status and byte counter
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158 orcc #IntMasks disable IRQs
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159 WrNVR.Lp ldb ,u+ get caller's data
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160 std ,x generate RTC address strobe and save data to NVRAM
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161 inca next NVRAM address
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162 dec 1,s done yet?
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163 bne WrNVR.Lp no, go save another byte
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164 puls cc,b recover IRQ enable status and clean up stack
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165 NVR.RtM puls y,u recover register stack & data buffer pointers
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166 ldd #$0100 return one page
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167 os9 F$SRtMem
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168 NVR.Exit rts
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169
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170 Arg.Err ldb #E$IllArg Illegal Argument error
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171 bra NVR.Err
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172
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173 ChkRead cmpa #READ. return NVRAM data to caller?
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174 bne Arg.Err illegal access mode, go return error...
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175 lda R$Y+1,y get NVRAM start address
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176 adda #$0E add offset to first RTC NVRAM address
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177 ldx M$Mem,pcr get clock base address from fake memory requirement
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178 pshs cc,b save IRQ enable status and byte counter
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179 orcc #IntMasks disable IRQs
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180 RdNVR.Lp sta ,x generate RTC address strobe
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181 ldb 1,x get NVRAM data
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182 stb ,u+ save it to buffer
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183 inca next NVRAM address
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184 dec 1,s done yet?
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185 bne RdNVR.Lp no, go get another byte
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186 puls cc,a recover IRQ enable status, clean up stack ([A]=0)
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187 ldb R$B,y [D]=byte count
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188 pshs d save it...
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189 ldx <D.Proc get caller's process descriptor address
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190 ldb P$Task,x caller is source task
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191 lda <D.SysTsk system is destination task
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192 ldu R$X,y get caller's source pointer
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193 puls y recover byte count
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194 ldx 2,s get data buffer (source) pointer
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195 os9 F$Move go MOVE data
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196 bcc NVR.RtM
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197 NVR.Err puls y,u recover caller's stack and data pointers
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198 pshs b save error code
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199 ldd #$0100 return one page
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200 os9 F$SRtMem
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201 comb set Carry for error
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202 puls b,pc recover error code, return...
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203 ENDC
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204
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205
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206 Init equ *
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207 IFGT Level-1
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208 * Eliminator will install specific system calls
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209 leay NewSvc,pcr insert syscalls
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210 os9 F$SSvc
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211 ENDC
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212 rts
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213
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214 emod
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215 eom equ *
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216 end
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217