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1 // Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of the License "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // e32\drivers\adc\d_adc.cpp |
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15 // Generic ADC driver |
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16 // |
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17 // |
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18 |
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19 |
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20 #include <adc.h> |
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21 |
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22 /****************************************************** |
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23 * ADC Channel |
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24 ******************************************************/ |
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25 EXPORT_C TAdcChannel::TAdcChannel(TInt anAdc) |
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26 : iChannelId(-1), iCommandCount(0), iCommandList(NULL), |
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27 iReadings(NULL) |
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28 { |
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29 iNext=NULL; |
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30 // iPriority=0; |
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31 if (anAdc>=0 && anAdc<DAdc::NumberOfAdcs) |
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32 iAdc=DAdc::TheAdcs[anAdc]; |
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33 else |
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34 iAdc=NULL; |
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35 } |
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36 |
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37 EXPORT_C void TAdcChannel::Read(TInt* aReadingBuffer) |
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38 // |
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39 // Initiate a reading of this channel |
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40 // |
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41 { |
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42 TInt irq=NKern::DisableAllInterrupts(); |
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43 if (!iNext) |
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44 { |
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45 iReadings=aReadingBuffer; |
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46 iAdc->Add(this); |
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47 } |
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48 NKern::RestoreInterrupts(irq); |
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49 } |
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50 |
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51 EXPORT_C void TAdcChannel::Preamble() |
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52 // |
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53 // Default preamble does nothing |
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54 // |
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55 { |
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56 } |
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57 |
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58 EXPORT_C void TAdcChannel::Postamble() |
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59 // |
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60 // Default postamble does nothing |
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61 // |
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62 { |
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63 } |
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64 |
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65 |
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66 /****************************************************** |
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67 * ADC Controller |
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68 ******************************************************/ |
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69 LOCAL_C void timerExpired(TAny* aPtr) |
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70 { |
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71 ((DAdc*)aPtr)->TimerExpired(); |
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72 } |
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73 |
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74 DAdc::DAdc() |
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75 : iTimer(timerExpired,this) |
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76 { |
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77 // iCurrentChannel=NULL; |
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78 // iCurrentCommand=0; |
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79 // iCommandPtr=0; |
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80 // iCommandCount=0; |
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81 // iMinPriority=0; |
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82 } |
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83 |
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84 DAdc::~DAdc() |
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85 { |
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86 } |
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87 |
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88 EXPORT_C TInt DAdc::SetMinPriority(TInt anAdc, TInt aPriority) |
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89 { |
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90 if (anAdc<0 || anAdc>=NumberOfAdcs) |
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91 return KErrArgument; |
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92 if (aPriority<0 || aPriority>KNumAdcChannelPriorities) |
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93 return KErrArgument; |
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94 return TheAdcs[anAdc]->DoSetMinPriority(aPriority); |
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95 } |
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96 |
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97 TInt DAdc::DoSetMinPriority(TInt aPriority) |
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98 { |
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99 TInt irq=NKern::DisableAllInterrupts(); |
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100 if (aPriority<iMinPriority) |
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101 { |
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102 if (iList.iPresent[0]) |
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103 { |
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104 TAdcChannel* pN=iList.First(); |
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105 if (pN->iPriority>=aPriority) |
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106 { |
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107 iList.Remove(pN); |
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108 Execute(pN); |
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109 } |
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110 } |
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111 } |
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112 iMinPriority=aPriority; |
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113 NKern::RestoreInterrupts(irq); |
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114 return KErrNone; |
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115 } |
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116 |
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117 void DAdc::Add(TAdcChannel* aChannel) |
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118 // |
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119 // Queue another ADC reading request |
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120 // |
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121 { |
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122 if (iCurrentChannel || (aChannel->iPriority<iMinPriority)) |
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123 iList.Add(aChannel); |
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124 else |
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125 Execute(aChannel); |
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126 } |
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127 |
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128 void DAdc::Execute(TAdcChannel* aChannel) |
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129 // |
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130 // Begin execution of an ADC request |
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131 // This runs in an ISR or with interrupts disabled |
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132 // |
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133 { |
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134 aChannel->iNext=(TPriListLink*)1; // so channel will not be queued again |
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135 iCurrentChannel=aChannel; |
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136 iCommandPtr=aChannel->iCommandList; |
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137 iCommandCount=aChannel->iCommandCount; |
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138 NextCommand(); |
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139 } |
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140 |
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141 void DAdc::NextCommand() |
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142 // |
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143 // Perform the next command in the command list |
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144 // This runs in an ISR or with interrupts disabled |
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145 // |
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146 { |
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147 TBool wait=EFalse; |
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148 TAdcChannel* pC=iCurrentChannel; |
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149 if (iCommandCount) |
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150 { |
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151 TInt c=*iCommandPtr++; |
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152 iCurrentCommand=c; |
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153 iCommandCount--; |
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154 if (c & EAdcCmdPreamble) |
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155 pC->Preamble(); |
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156 if (c & EAdcCmdPostamble) |
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157 pC->Postamble(); |
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158 if (c & EAdcCmdWait) |
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159 { |
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160 iTimer.OneShot(c & 0xffff); |
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161 wait=ETrue; |
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162 } |
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163 else if (c & EAdcCmdReading) |
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164 { |
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165 StartConversion(pC->iChannelId); |
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166 wait=ETrue; |
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167 } |
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168 } |
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169 if (iCommandCount==0 && !wait) |
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170 { |
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171 iCurrentChannel=NULL; |
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172 pC->iNext=NULL; |
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173 if (iList.iPresent[0]) |
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174 { |
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175 TAdcChannel* pN=iList.First(); |
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176 if (pN->iPriority>=iMinPriority) |
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177 { |
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178 iList.Remove(pN); |
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179 Execute(pN); |
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180 } |
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181 } |
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182 pC->Complete(); |
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183 } |
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184 } |
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185 |
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186 void DAdc::Start() |
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187 // |
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188 // Called on completion of initialisation to start processing requests |
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189 // This runs in an ISR |
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190 // |
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191 { |
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192 iCurrentChannel=NULL; |
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193 if (iList.iPresent[0]) |
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194 { |
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195 TAdcChannel* pN=iList.First(); |
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196 iList.Remove(pN); |
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197 Execute(pN); |
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198 } |
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199 } |
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200 |
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201 void DAdc::ConversionComplete(TInt aValue) |
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202 // |
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203 // Called when a conversion has completed |
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204 // This runs in an ISR |
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205 // |
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206 { |
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207 if ((iCurrentCommand & EAdcCmdDiscard)==0) |
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208 *(iCurrentChannel->iReadings)++=aValue; |
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209 NextCommand(); |
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210 } |
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211 |
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212 void DAdc::TimerExpired() |
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213 // |
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214 // Called in ISR when timer expires |
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215 // |
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216 { |
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217 NextCommand(); |
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218 } |
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219 |