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1 ********************************************************************
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2 * SWRead - Read SmartWatch clock
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3 *
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4 * $Id: swread.asm,v 1.1.1.1 2001/02/21 23:30:54 boisy Exp $
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5 *
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6 * Copyright May, 1990 by Robert Gault
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7
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8 * SWREAD will read smartwatch compensating for 12hr mode if active
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9 * time will be sent to OS-9 in 24hr mode for compatability
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10 *
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11 * The routine does grab a large uninterruptible block of time from
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12 * the system, but no other way seems possible.
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13 *
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14 * syntax swread [n&] n=1-60 minutes
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15 * D.Daywk stored for possible use
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16 *
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17 * Ed. Comments Who YY/MM/DD
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18 * ------------------------------------------------------------------
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19 * 1 Created RG 91/03/01
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20 * 1 Changed irq handling; MPI handling; RG 91/10/29
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21 * error handling
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22 * 1 Removed relocation routine. Removal could be RG 92/12/26
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23 * dangerous if OS-9 did not grab block from the
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24 * low addresses first. Code must not be in a
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25 * RAM/ROM block when ROMs activated.
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26 * 2 Relocated part of clock read routine to RG 94/12/19
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27 * shorten the time spent with irqs off.
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28
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29 nam SWRead
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30 ttl Read SmartWatch clock
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31
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32 ifp1
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33 use defsfile
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34 endc
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35
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36 cartI equ $FF22 cartridge IRQ report
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37 multipac equ $FF7F
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38 rom equ $FFDE
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39 ram equ $FFDF
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40 IEN equ %00100000
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41 FEN equ %00010000
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42 SCS equ %00000100
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43 ROM1 equ %00000010
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44 ROM0 equ %00000001
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45 *D.Cntury set $6A century byte
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46
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47 type set prgrm+objct
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48 revs set reent+1
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49 edition set 2
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50
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51 mod pgrmend,name,type,revs,start,size
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52
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53 name fcs /SWRead/
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54 fcb edition
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55
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56 locblk0 rmb 2 pointer to block 0
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57 locblk3E rmb 2 pointer to block $3E ie. disk ROM
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58 dpsave rmb 1
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59 sleep rmb 1 sleep interval time in minutes
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60 byte1 rmb 1 temp storage of clock read data; if never changes - no clock
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61 clkflag rmb 1 set when clock is found
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62 mpiimage rmb 1
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63 sleepflg rmb 1 indicates multiple reads requested
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64 timer rmb 1 count down for sleep interval; per minute
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65 century rmb 1 century flag
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66 rawdata rmb 8 direct readout from clock chip
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67
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68 stack rmb 200
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69 size equ .
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70
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71 message1 fcc /no clock found/
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72 fcb $0D
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73 setime fcc /setime/ forced chain to setime routine
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74 fcb $0D
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75
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76 errmes fcb $0a
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77 fcc /Swread syntax:/
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78 fdb $a0a
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79 fcc /swread [n&]/
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80 fcb $0a
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81 fcc / The parameter string is optional; n = 1 to 60 min/
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82 fcb $0a
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83 fcc / permitting the watch to be poled in background every/
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84 fcb $0a
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85 fcc / n minutes. Use decimal time values./
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86 fcb $0d
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87 allert fcb $C5,$3A,$A3,$5C,$C5,$3A,$A3,$5C,0
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88
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89 start clr <sleepflg
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90 cmpd #2
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91 blo noparams
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92 ldd ,x
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93 cmpa #'?
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94 lbeq syntax
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95 cmpa #'-
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96 lbeq syntax
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97
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98 cmpb #'0 if second byte is CR then only one number
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99 blo onebyte
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100 subd #$3030 convert from ascii to bcd
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101
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102 cmpd #$600 one hour skip is max
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103 lbhi syntax
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104 cmpb #9 must be a number from 0-9
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105 lbhi syntax
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106
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107 pshs b convert reg.D to hexidecimal
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108 ldb #10
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109 mul
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110 addb ,s+
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111 bra storeit
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112
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113 onebyte suba #'0
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114 cmpa #9
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115 lbhi syntax
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116
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117 storeit stb <timer
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118 stb <sleep used to reset timer on count down
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119 com <sleepflg
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120
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121 noparams equ *
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122 lda multipac
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123 anda #3 retain IRQ settings
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124 ora #$30 start at slot 4; ROM setting
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125 sta <mpiimage
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126
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127 doit pshs u
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128 ldb #1 single block
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129 ldx #$3E disk rom; $07C000-$07DFFF
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130 os9 f$mapblk map into user space clock ROM
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131 bcs exit2
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132 stu locblk3E save pointer
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133 ldx #0 system direct page
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134 os9 f$mapblk system direct page
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135 bcs exit2
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136 leax ,u faster but = to TFR; get pointer for system DP
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137 stu locblk0 save pointer
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138 tfr dp,b get our own DP
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139 stb dpsave
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140
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141 bsr readclk
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142
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143 ldb #1 unmap blocks from user space
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144 ldu locblk3E get pointer
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145 os9 f$clrblk
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146 ldb #1
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147 ldu locblk0 get pointer
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148 os9 f$clrblk
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149 puls u
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150
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151 tst <clkflag was clock found?
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152 beq error2
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153 tst <sleepflg are we in repeat mode?
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154 beq exit
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155
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156 snooze ldx #3540 = one minute of ticks minus one second for overhead
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157 os9 f$sleep
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158 cmpx #0
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159 bne exit received signal so quit
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160
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161 dec timer
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162 bne snooze
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163
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164 lda sleep reset timer
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165 sta timer
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166 bra doit go and read the clock
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167
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168 exit2 leas 2,s puls u
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169 coma set cc
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170 os9 F$exit
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171 error ldb #e$illarg
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172 os9 F$exit
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173
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174 error2 lda #2 error path
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175 leax message1,pcr
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176 ldy #40
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177 os9 I$WritLn
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178 * force a normal Setime as SmartWatch was not detected
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179 lda #$11 modul type
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180 ldb #2 size of data area
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181 leax setime,pcr
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182 ldy #0 parameter size
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183 leas stack,u
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184 leau size,u
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185 os9 F$Chain
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186 exit clrb
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187 os9 F$exit
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188
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189 * this is the heart of the clock reading routine
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190 * regX regU point to system direct page
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191 readclk pshs cc
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192 lda d.hinit,x get $FF90 image
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193 ldb multipac get current setting
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194 pshs d save them
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195 anda #^(IEN+FEN+ROM1+ROM0) no GIME IRQ/FIRQ; external access
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196 orcc #$50 stop interrupts
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197 sta $FF90
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198 sta rom go to ROM mode
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199 ldx <locblk3E point to clock ROM
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200 ldb <mpiimage get new value for MPI
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201 clr <clkflag start with clock not found
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202 lda locblk3E
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203 tfr a,dp point to clock
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204
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205 findclk stb multipac set new slot
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206 leay allert,pcr point to clock wakeup code
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207 lda <4 clear clock at $C004
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208 clrb
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209 bita #1 1bit serial I/O port; if no clock, all bits should be 0 or 1
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210 beq low
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211 comb
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212 low stb >byte1 save as flag for found clock
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213
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214 nxtbyte ldb #8 bits/byte
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215 lda ,y+
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216 beq gettime
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217 nxtbit lsra do a serial generation
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218 bcs high
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219 cmpa <0 talk to clock at $C000; cmp faster than tst
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220 bra high2
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221 high cmpa <1 talk to clock at $C001
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222 high2 decb
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223 bne nxtbit
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224 bra nxtbyte
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225
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226 gettime lda #8 8 bytes to read from clock
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227 pshs a
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228 ldy #rawdata
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229 * read serial bit stream from clock
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230 timebyte lsr <4
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231 rora
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232 lsr <4
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233 rora
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234 lsr <4
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235 rora
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236 lsr <4
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237 rora
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238 lsr <4
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239 rora
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240 lsr <4
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241 rora
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242 lsr <4
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243 rora
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244 lsr <4
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245 rora
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246 sta ,y+ store in raw data
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247 cmpa >byte1 if reg.A never changes then no clock
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248 beq maybe always possible that a clock byte might look like ROM
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249 inc >clkflag indicate a found clock
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250 maybe dec ,s
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251 bne timebyte
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252 leas 1,s yank counter
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253 tst >clkflag did we find the clock?
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254 bne found
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255 ldb >mpiimage try another MPI slot
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256 bitb #$30 did we get to slot 0?
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257 beq found
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258 subb #$10 next slot
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259 stb >mpiimage save image so that we don't hunt the next time.
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260 bra findclk
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261
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262 found lda >dpsave
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263 tfr a,dp back to program DP
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264 sta ram go back to RAM mode
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265 puls d
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266 stb multipac restore to original setting
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267 tst cartI clear CART flag incase autostart ROM pack was present in MPI
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268 sta $FF90 restore GIME mode
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269 puls cc restore IRQs
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270 tst <clkflag
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271 beq noclk
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272 ldx #rawdata
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273 leay D.Slice,u
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274 ldb #8
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275 pshs b
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276 trans lda ,x+ translate serial data into OS-9 format
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277 ldb ,s
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278 cmpb #1 year
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279 bne notyr
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280 cmpa #$80 binary coded decimal number
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281 bhi nintn
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282 * ldb #20
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283 * stb D.Cntury,u
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284 sta <century
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285 bra notyr
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286 nintn
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287 * ldb #19
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288 * stb D.Cntury,u
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289 clr <century
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290 *notyr ldb ,s
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291 notyr cmpb #4 day of the week
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292 bne notdywk
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293 anda #7
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294 sta D.Daywk,u
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295 bra nxtdata
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296 notdywk cmpb #5 special 12/24, AM/PM indicator
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297 bne cnvrt convert any number
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298 bita #%10000000 12/24 hour bit
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299 beq cnvrt 24 hour time
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300 bita #%00100000 AM/PM bit since 12 hour time, check AM/PM
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301 pshs cc
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302 anda #%00011111 keep only time
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303 puls cc
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304 bne PMhr
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305 cmpa #$12 bcd value
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306 bne cnvrt
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307 clra 12 AM = 0 hrs 24hr time
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308 bra cnvrt
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309 Pmhr cmpa #$12 bcd value
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310 beq cnvrt 12PM = 1200 24 hr time
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311 adda #$12 all other times (1-11) add 12; ie. 1300-2300
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312 cnvrt tfr a,b return result in reg.B
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313 anda #%11110000 get MSN
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314 lsra
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315 lsra
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316 sta ,-s save #4a
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317 lsra
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318 sta ,-s save #2a
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319 subb ,s+ 16a+b-4a
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320 subb ,s+ 12a+b-2a=10a+b
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321 stb ,-y decrease pointer and then store
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322 nxtdata dec ,s
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323 bne trans
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324 tst <century
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325 beq not20
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326 lda #100
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327 adda 1,y
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328 sta 1,y
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329 not20 puls b,pc
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330
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331 noclk clr D.Daywk,u clear garbage as new date routine reads D.Daywk
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332 leay D.Time,u
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333 ldd #7
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334 noclklp sta ,y+ clear clock packet; faster than a clr ,y+
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335 decb
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336 bne noclklp
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337 * clr D.Cntury,u
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338 clr <century
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339 clr <clkflag
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340 rts
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341
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342 syntax lda #2
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343 leax errmes,pcr
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344 ldy #300
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345 os9 I$Writln
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346 clrb
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347 os9 F$Exit
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348
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349 emod
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350 pgrmend equ *
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351 end
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352
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