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annotate level1/modules/dwwrite.asm @ 2770:bfe3de781ddf lwtools-port

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Added Arduino dwread/dwwrite changes
author Boisy Pitre <boisy.pitre@nuance.com>
date Tue, 22 Jan 2013 19:14:52 -0600
parents c2112f93923a
children ce3dba57003b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2770
bfe3de781ddf Added Arduino dwread/dwwrite changes
Boisy Pitre <boisy.pitre@nuance.com>
parents: 2725
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1 *******************************************************
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2 *
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3 * DWWrite
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4 * Send a packet to the DriveWire server.
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5 * Serial data format: 1-8-N-1
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6 * 4/12/2009 by Darren Atkinson
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7 *
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8 * Entry:
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9 * X = starting address of data to send
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10 * Y = number of bytes to send
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11 *
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12 * Exit:
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13 * X = address of last byte sent + 1
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14 * Y = 0
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15 * All others preserved
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16 *
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17
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18
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19 IFNE ARDUINO
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20 DWWrite pshs a ; preserve registers
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21 txByte
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22 lda ,x+ ; get byte from buffer
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23 sta $FF52 ; put it to PIA
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24 loop@ tst $FF53 ; check status register
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25 bpl loop@ ; until CB1 is set by Arduino, continue looping
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26 tst $FF52 ; clear CB1 in status register
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27 leay -1,y ; decrement byte counter
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28 bne txByte ; loop if more to send
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29
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30 puls a,pc ; restore registers and return
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31
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32 ELSE
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33
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34 IFNE JMCPBCK
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35 DWWrite pshs d,cc ; preserve registers
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36 orcc #$50 ; mask interrupts
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37 txByte
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38 lda ,x+
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39 sta $FF44
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40 leay -1,y ; decrement byte counter
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Boisy Pitre <boisy.pitre@nuance.com>
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41 bne txByte ; loop if more to send
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42
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43 puls cc,d,pc ; restore registers and return
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44
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45 ELSE
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46 IFNE BECKER
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47 DWWrite pshs d,cc ; preserve registers
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48 orcc #$50 ; mask interrupts
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49 ; ldu #BBOUT ; point U to bit banger out register
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50 ; lda 3,u ; read PIA 1-B control register
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51 ; anda #$f7 ; clear sound enable bit
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52 ; sta 3,u ; disable sound output
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53 ; fcb $8c ; skip next instruction
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54
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55 txByte
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56 lda ,x+
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57 sta $FF42
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58 leay -1,y ; decrement byte counter
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Boisy Pitre <boisy.pitre@nuance.com>
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59 bne txByte ; loop if more to send
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60
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61 puls cc,d,pc ; restore registers and return
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62 ENDC
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63 ENDC
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64
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65 IFEQ BECKER+JMCPBCK+ARDUINO
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66 IFEQ BAUD38400+H6309
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67 *******************************************************
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68 * 57600 (115200) bps using 6809 code and timimg
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69 *******************************************************
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70
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71 DWWrite pshs dp,d,cc ; preserve registers
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72 orcc #$50 ; mask interrupts
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73 ldd #$04ff ; A = loop counter, B = $ff
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74 tfr b,dp ; set direct page to $FFxx
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75 setdp $ff
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76 ldb <$ff23 ; read PIA 1-B control register
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77 andb #$f7 ; clear sound enable bit
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78 stb <$ff23 ; disable sound output
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79 fcb $8c ; skip next instruction
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80
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81 txByte stb <BBOUT ; send stop bit
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82 ldb ,x+ ; get a byte to transmit
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83 nop
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84 lslb ; left rotate the byte two positions..
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85 rolb ; ..placing a zero (start bit) in bit 1
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86 tx0020 stb <BBOUT ; send bit (start bit, d1, d3, d5)
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87 rorb ; move next bit into position
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88 exg a,a
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89 nop
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90 stb <BBOUT ; send bit (d0, d2, d4, d6)
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91 rorb ; move next bit into position
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92 leau ,u
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93 deca ; decrement loop counter
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94 bne tx0020 ; loop until 7th data bit has been sent
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95
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96 stb <BBOUT ; send bit 7
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97 ldd #$0402 ; A = loop counter, B = MARK value
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98 leay ,-y ; decrement byte counter
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99 bne txByte ; loop if more to send
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100
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101 stb <BBOUT ; leave bit banger output at MARK
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102 puls cc,d,dp,pc ; restore registers and return
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103 setdp $00
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104 ELSE
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105
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106 IFNE BAUD38400
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107 *******************************************************
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108 * 38400 bps using 6809 code and timimg
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109 *******************************************************
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110
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111 DWWrite pshs u,d,cc ; preserve registers
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112 orcc #$50 ; mask interrupts
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113 ldu #BBOUT ; point U to bit banger out register
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114 lda 3,u ; read PIA 1-B control register
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115 anda #$f7 ; clear sound enable bit
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116 sta 3,u ; disable sound output
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117 fcb $8c ; skip next instruction
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118
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119 txByte stb ,--u ; send stop bit
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120 leau ,u+
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121 lda #8 ; counter for start bit and 7 data bits
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122 ldb ,x+ ; get a byte to transmit
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123 lslb ; left rotate the byte two positions..
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124 rolb ; ..placing a zero (start bit) in bit 1
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125 tx0010 stb ,u++ ; send bit
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126 tst ,--u
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127 rorb ; move next bit into position
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128 deca ; decrement loop counter
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129 bne tx0010 ; loop until 7th data bit has been sent
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130 leau ,u
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131 stb ,u ; send bit 7
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132 lda ,u++
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133 ldb #$02 ; value for stop bit (MARK)
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134 leay -1,y ; decrement byte counter
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135 bne txByte ; loop if more to send
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136
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137 stb ,--u ; leave bit banger output at MARK
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138 puls cc,d,u,pc ; restore registers and return
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139
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140
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141 ELSE
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142 *******************************************************
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143 * 57600 (115200) bps using 6309 native mode
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144 *******************************************************
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145
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146 DWWrite pshs u,d,cc ; preserve registers
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147 orcc #$50 ; mask interrupts
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148 * ldmd #1 ; requires 6309 native mode
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149 ldu #BBOUT+1 ; point U to bit banger out register +1
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150 aim #$f7,2,u ; disable sound output
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151 lda #8 ; counter for start bit and 7 data bits
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152 fcb $8c ; skip next instruction
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153
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154 txByte stb -1,u ; send stop bit
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155 tx0010 ldb ,x+ ; get a byte to transmit
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156 lslb ; left rotate the byte two positions..
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157 rolb ; ..placing a zero (start bit) in bit 1
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158 bra tx0030
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159
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160 tx0020 bita #1 ; even or odd bit number ?
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161 beq tx0040 ; branch if even (15 cycles)
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162 tx0030 nop ; extra (16th) cycle
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163 tx0040 stb -1,u ; send bit
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164 rorb ; move next bit into position
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165 deca ; decrement loop counter
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166 bne tx0020 ; loop until 7th data bit has been sent
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Boisy Pitre <boisy.pitre@nuance.com>
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167 leau ,u+
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168 stb -1,u ; send bit 7
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169 ldd #$0802 ; A = loop counter, B = MARK value
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170 leay -1,y ; decrement byte counter
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171 bne txByte ; loop if more to send
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172
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173 stb -1,u ; final stop bit
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Boisy Pitre <boisy.pitre@nuance.com>
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174 puls cc,d,u,pc ; restore registers and return
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175
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176
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177 ENDC
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178 ENDC
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179 ENDC
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180 ENDC