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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 139 | johboh | 1 | /********************************************************************* |
| 2 | * |
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| 3 | * Functions for reading ADC |
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| 4 | * |
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| 5 | ********************************************************************* |
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| 6 | * FileName: $HeadURL: https://svn.auml.se/svn/HomeAutomation/trunk/EmbeddedSoftware/PIC/Include/adc.c $ |
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| 7 | * Last changed: $LastChangedDate: 2007-02-25 20:51:08 +0100 (Sun, 25 Feb 2007) $ |
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| 8 | * By: $LastChangedBy: johboh $ |
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| 9 | * Revision: $Revision: 339 $ |
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| 10 | ********************************************************************/ |
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| 11 | #include <adc.h> |
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| 12 | |||
| 13 | #ifdef USE_ADC |
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| 14 | |||
| 15 | static unsigned long TEMP_VALUE; |
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| 16 | static unsigned int TEMP_COUNT; |
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| 17 | |||
| 18 | BOOL TEMP_DONE = FALSE; |
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| 19 | |||
| 20 | /* |
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| 21 | * Function: adcInit |
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| 22 | * |
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| 23 | * Input: True or false to use external voltage reference or not. portCfg is portconfiguration. |
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| 24 | * Output: none. |
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| 25 | * Pre-conditions: none |
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| 26 | * Affects: none. |
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| 27 | * Depends: none. |
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| 28 | */ |
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| 29 | void adcInit(BOOL useExtRef,BYTE portCfg) |
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| 30 | { |
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| 31 | // Setup ADC to use low interrupt prior and external ref or not. |
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| 32 | |||
| 33 | ADCON1 = 0b00000000 | ((1 & useExtRef)<<4) | (0xF & portCfg); |
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| 34 | ADCON0 = 0b00000000; |
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| 35 | ADCON2 = 0b10101011; |
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| 36 | //useExtRef |
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| 37 | ADCON0bits.ADON = 1; |
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| 38 | PIR1bits.ADIF = 0; |
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| 39 | PIE1bits.ADIE = 1; |
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| 40 | IPR1bits.ADIP = 0; // Low priority |
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| 41 | } |
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| 42 | |||
| 43 | |||
| 44 | /* |
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| 45 | * Function: adcISR |
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| 46 | * |
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| 47 | * Input: ADC interrupt rotune. Need to be called from LOW ISR. |
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| 48 | * Output: none. |
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| 49 | * Pre-conditions: none |
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| 50 | * Affects: none. |
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| 51 | * Depends: none. |
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| 52 | */ |
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| 53 | void adcISR(void) |
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| 54 | { |
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| 55 | if (PIE1bits.ADIE && PIR1bits.ADIF) |
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| 56 | { |
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| 57 | PIR1bits.ADIF = 0; |
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| 58 | |||
| 59 | TEMP_VALUE+=((int)ADRESH)<<8 | ADRESL; |
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| 60 | TEMP_COUNT++; |
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| 61 | |||
| 62 | if (TEMP_COUNT>=TEMP_SAMPLES) |
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| 63 | { |
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| 64 | TEMP_VALUE = TEMP_VALUE/TEMP_COUNT; |
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| 65 | TEMP_DONE = TRUE; |
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| 66 | } |
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| 67 | else |
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| 68 | { |
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| 69 | Delay10TCYx(100); |
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| 70 | ADCON0bits.GO = 1; |
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| 71 | } |
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| 72 | |||
| 73 | } |
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| 74 | } |
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| 75 | |||
| 76 | |||
| 77 | /* |
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| 78 | * Function: adcConvert |
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| 79 | * |
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| 80 | * Input: Channel to start convert. Between 0 and 15 |
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| 81 | * Output: none. |
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| 82 | * Pre-conditions: none |
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| 83 | * Affects: none. |
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| 84 | * Depends: none. |
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| 85 | */ |
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| 86 | BOOL adcConvert(BYTE channel) |
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| 87 | { |
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| 88 | if (channel>15) return FALSE; |
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| 89 | |||
| 90 | TEMP_VALUE = 0; |
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| 91 | TEMP_COUNT = 0; |
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| 92 | |||
| 93 | ADCON0 = (channel << 2) | (ADCON0 & 0b11000011); |
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| 94 | |||
| 95 | TEMP_DONE = FALSE; |
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| 96 | |||
| 97 | ADCON0bits.GO = 1; |
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| 98 | |||
| 99 | return TRUE; |
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| 100 | } |
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| 101 | |||
| 102 | |||
| 103 | /* |
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| 104 | * Function: adcRead |
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| 105 | * |
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| 106 | * Input: none. |
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| 107 | * Output: Raw read data. |
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| 108 | * Pre-conditions: none |
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| 109 | * Affects: none. |
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| 110 | * Depends: none. |
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| 111 | */ |
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| 112 | int adcRead(void) |
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| 113 | { |
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| 114 | TEMP_DONE=FALSE; |
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| 115 | return TEMP_VALUE; |
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| 116 | } |
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| 117 | |||
| 118 | |||
| 119 | /* |
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| 120 | * Function: temperatureRead |
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| 121 | * |
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| 122 | * Input: none. |
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| 123 | * Output: XX.Y C, where tenth is XX and decimal is Y |
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| 124 | * Pre-conditions: none |
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| 125 | * Affects: none. |
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| 126 | * Depends: none. |
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| 127 | */ |
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| 128 | void temperatureRead(signed char *tenth, BYTE *decimal) |
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| 129 | { |
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| 130 | // assuming 2.5V ref and TC47 |
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| 131 | signed int i = 0, v11,v01,tfloat; |
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| 132 | |||
| 133 | tfloat =((TEMP_VALUE * 39)>>4) - 499; |
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| 134 | |||
| 135 | v11 = tfloat/10; |
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| 136 | v01 = tfloat-v11*10; |
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| 137 | |||
| 138 | if (v01>=0 && v01<=2) v01 = 0; |
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| 139 | else if (v01>=3 && v01<=7) v01 = 5; |
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| 140 | else { v01 = 0; v11++;} |
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| 141 | |||
| 339 | johboh | 142 | *tenth = (signed char)v11; |
| 143 | *decimal = (BYTE)v01; |
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| 139 | johboh | 144 | |
| 145 | TEMP_DONE=FALSE; |
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| 146 | } |
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| 147 | |||
| 339 | johboh | 148 | unsigned long adcGetRaw() |
| 149 | { |
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| 150 | return TEMP_VALUE; |
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| 151 | } |
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| 139 | johboh | 152 | |
| 339 | johboh | 153 | |
| 139 | johboh | 154 | /* |
| 155 | * Function: adcDone |
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| 156 | * |
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| 157 | * Input: none. |
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| 158 | * Output: If adc convertion is done or not. |
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| 159 | * Pre-conditions: none |
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| 160 | * Affects: none. |
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| 161 | * Depends: none. |
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| 162 | */ |
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| 163 | BOOL adcDone(void) |
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| 164 | { |
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| 165 | return TEMP_DONE; |
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| 166 | } |
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| 167 | |||
| 168 | #endif |