100 lines
2.3 KiB
Text
100 lines
2.3 KiB
Text
//insert gpl code headers here
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//macro cycle:
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//setup: intitalise, read all devices and send, wait for gps acquisition
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//loop: null
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//interrupt:
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//1)read in ADC's (direct port sampling)
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//2)read out GPS timestamp (TIMEMARK) and position (UART or SPI)
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//3)read out extra data (temp, pressure, humidity) (I2C)
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//3.1)maybe read some more out of the adc's (3 samples?) direct port sampling, cycle clock
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//4)apply high level trigger (threshold?) test.
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//5)if test is positive then send the output to Pi over rx/tx port 1
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//6)return to waiting state
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//define pins for SPI
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#define DATAOUT 11//MOSI
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#define DATAIN 12//MISO
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#define SPICLOCK 13//sck
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#define SLAVESELECT 10//ss
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//opcodes
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#define WREN 6
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#define WRDI 4
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#define RDSR 5
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#define WRSR 1
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#define READ 3
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#define WRITE 2
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byte eeprom_output_data;
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byte eeprom_input_data=0;
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int tempsensor =0;
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int pressuresensor =0;
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int humiditysensor =0;
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byte clr;
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int address=0;
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//data buffer
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char buffer [128];
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int pin = 13;
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volatile int state = LOW;
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byte adcpt1, adcpt2, adcpt3;
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//directly read ports:
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//Port F (8 bits) and Port K (8 bits) and Port A (8 bits) = 24 bits total
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//set into two
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void setup()
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{
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pinMode(pin, OUTPUT);
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attachInterrupt(0, blink, CHANGE);
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Serial.begin(9600);
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//read SPI eeprom
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address = 0; //set the address of the temp sensor here
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tempsensor = read_eeprom(address);
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address = 1; //set the address of the pressure sensor here
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pressuresensor = read_eeprom(address);
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address = 2; //set the address of the humidity sensor here
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humiditysensor = read_eeprom(address);
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}
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void loop()
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{
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digitalWrite(pin, state);
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}
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void blink()
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{
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state = !state;
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adcpt1= PINF;
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adcpt2= PINK;
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adcpt3= PINA;
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Serial.println("done");
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}
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char spi_transfer(volatile char data)
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{
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SPDR = data; // Start the transmission
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while (!(SPSR & (1<<SPIF))) // Wait the end of the transmission
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{
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};
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return SPDR; // return the received byte
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}
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byte read_eeprom(int EEPROM_address)
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{
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//READ EEPROM
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int data;
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digitalWrite(SLAVESELECT,LOW);
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spi_transfer(READ); //transmit read opcode
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spi_transfer((char)(EEPROM_address>>8)); //send MSByte address first
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spi_transfer((char)(EEPROM_address)); //send LSByte address
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data = spi_transfer(0xFF); //get data byte
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digitalWrite(SLAVESELECT,HIGH); //release chip, signal end transfer
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return data;
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}
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