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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 153 | arune | 1 | /** |
| 2 | * DS18S20 over CAN program. |
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| 3 | * |
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| 4 | * @target AVR |
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| 5 | * @date 2006-12-09 |
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| 6 | * @author Jimmy Myhrman, Anders Runeson |
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| 7 | * |
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| 8 | * Högst experimentell, decimaldel fel vid negativ temperatur? |
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| 9 | * negativ temperatur helt otestad! |
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| 10 | * |
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| 11 | */ |
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| 12 | |||
| 13 | /*----------------------------------------------------------------------------- |
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| 14 | * Includes |
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| 15 | *---------------------------------------------------------------------------*/ |
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| 16 | /* system files */ |
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| 17 | #include <avr/io.h> |
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| 18 | #include <avr/interrupt.h> |
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| 19 | #include <avr/wdt.h> |
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| 20 | #include <stdio.h> |
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| 21 | /* lib files */ |
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| 22 | #include <can.h> |
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| 23 | #include <uart.h> |
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| 24 | #include <timebase.h> |
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| 25 | |||
| 26 | #include <onewire.h> |
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| 27 | #include <ds18x20.h> |
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| 28 | |||
| 29 | #include <delay.h> |
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| 30 | |||
| 31 | |||
| 169 | arune | 32 | |
| 153 | arune | 33 | #define MAXSENSORS 4 |
| 34 | |||
| 35 | uint8_t gSensorIDs[MAXSENSORS][OW_ROMCODE_SIZE]; |
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| 36 | |||
| 37 | uint8_t search_sensors(void) |
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| 38 | { |
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| 39 | uint8_t i; |
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| 40 | uint8_t id[OW_ROMCODE_SIZE]; |
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| 41 | uint8_t diff, nSensors; |
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| 42 | |||
| 43 | printf( "\nScanning Bus for DS18X20\n" ); |
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| 44 | |||
| 45 | nSensors = 0; |
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| 46 | |||
| 47 | for( diff = OW_SEARCH_FIRST; |
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| 48 | diff != OW_LAST_DEVICE && nSensors < MAXSENSORS ; ) |
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| 49 | { |
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| 50 | DS18X20_find_sensor( &diff, &id[0] ); |
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| 51 | |||
| 52 | if( diff == OW_PRESENCE_ERR ) { |
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| 53 | printf( "No Sensor found\n" ); |
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| 54 | break; |
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| 55 | } |
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| 56 | |||
| 57 | if( diff == OW_DATA_ERR ) { |
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| 58 | printf( "Bus Error\n" ); |
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| 59 | break; |
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| 60 | } |
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| 61 | |||
| 62 | for (i=0;i<OW_ROMCODE_SIZE;i++) |
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| 63 | gSensorIDs[nSensors][i]=id[i]; |
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| 64 | |||
| 65 | nSensors++; |
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| 66 | } |
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| 67 | |||
| 68 | return nSensors; |
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| 69 | } |
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| 70 | |||
| 71 | |||
| 169 | arune | 72 | |
| 153 | arune | 73 | /*----------------------------------------------------------------------------- |
| 74 | * Main Program |
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| 75 | *---------------------------------------------------------------------------*/ |
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| 76 | int main(void) { |
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| 77 | uint8_t nSensors, i; |
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| 78 | uint8_t subzero, cel, cel_frac_bits; |
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| 79 | |||
| 80 | Timebase_Init(); |
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| 81 | Serial_Init(); |
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| 82 | sei(); |
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| 83 | |||
| 84 | printf( "\nDS18X20 1-Wire-Reader\n" ); |
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| 85 | printf( "-----------------------" ); |
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| 86 | nSensors = search_sensors(); |
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| 87 | printf( "%i DS18X20 Sensor(s) available:\n", (int) nSensors ); |
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| 88 | |||
| 89 | for (i=0; i<nSensors; i++) { |
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| 90 | printf("Sensor# %i is a ", (int) i+1); |
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| 91 | if ( gSensorIDs[i][0] == DS18S20_ID) |
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| 92 | printf("DS18S20/DS1820"); |
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| 93 | else printf("DS18B20"); |
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| 94 | printf(" which is "); |
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| 95 | if ( DS18X20_get_power_status( &gSensorIDs[i][0] ) == |
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| 96 | DS18X20_POWER_PARASITE ) |
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| 97 | printf( "parasite" ); |
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| 98 | else printf( "externally" ); |
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| 99 | printf( " powered\n" ); |
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| 100 | } |
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| 101 | |||
| 102 | printf("CanInit...\n"); |
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| 103 | if (Can_Init() != CAN_OK) { |
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| 104 | printf("FAILED!\n"); |
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| 105 | } |
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| 106 | else { |
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| 107 | printf("OK!\n"); |
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| 108 | } |
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| 109 | |||
| 169 | arune | 110 | uint32_t timeStamp = 0; |
| 111 | |||
| 153 | arune | 112 | Can_Message_t txMsg; |
| 113 | Can_Message_t rxMsg; |
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| 114 | |||
| 115 | txMsg.DataLength = 2; |
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| 167 | eqlazer | 116 | txMsg.Id = 0; |
| 153 | arune | 117 | txMsg.RemoteFlag = 0; |
| 118 | txMsg.ExtendedFlag = 1; |
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| 169 | arune | 119 | |
| 120 | /* main loop */ |
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| 153 | arune | 121 | while (1) { |
| 122 | /* service the CAN routines */ |
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| 123 | Can_Service(); |
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| 124 | |||
| 125 | /* check if any messages have been received */ |
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| 126 | while (Can_Receive(&rxMsg) == CAN_OK) { |
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| 169 | arune | 127 | |
| 128 | } |
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| 153 | arune | 129 | |
| 130 | /* check temperature and send on CAN once every other second */ |
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| 131 | if (Timebase_PassedTimeMillis(timeStamp) >= 2000) { |
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| 132 | timeStamp = Timebase_CurrentTime(); |
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| 133 | |||
| 134 | if ( DS18X20_start_meas( DS18X20_POWER_PARASITE, NULL ) == DS18X20_OK) { |
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| 169 | arune | 135 | printf("Measuring temperature... "); |
| 153 | arune | 136 | delay_ms(DS18B20_TCONV_12BIT); |
| 137 | for ( i=0; i<nSensors; i++ ) { |
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| 138 | if ( DS18X20_read_meas( &gSensorIDs[i][0], &subzero, |
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| 139 | &cel, &cel_frac_bits) == DS18X20_OK ) { |
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| 140 | |||
| 141 | //txMsg.Data.bytes[0] = subzero; |
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| 142 | if (subzero) { |
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| 143 | txMsg.Data.bytes[i*2] = -cel; |
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| 169 | arune | 144 | txMsg.Data.bytes[i*2+1] = ~(cel_frac_bits<<4); |
| 153 | arune | 145 | } else { |
| 146 | txMsg.Data.bytes[i*2] = cel; |
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| 169 | arune | 147 | txMsg.Data.bytes[i*2+1] = (cel_frac_bits<<4); |
| 153 | arune | 148 | } |
| 169 | arune | 149 | |
| 153 | arune | 150 | } |
| 154 | arune | 151 | else printf("CRC Error (lost connection?)\n"); |
| 153 | arune | 152 | } |
| 169 | arune | 153 | |
| 154 | txMsg.DataLength = nSensors*2; |
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| 155 | printf("sending...\n"); |
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| 156 | /* send txMsg */ |
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| 157 | Can_Send(&txMsg); |
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| 153 | arune | 158 | } |
| 154 | arune | 159 | else printf("Start meas. failed (short circuit?)\n"); |
| 153 | arune | 160 | |
| 161 | } |
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| 162 | } |
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| 163 | |||
| 164 | return 0; |
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| 165 | } |