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Update examples to use transactions

main
PaulStoffregen 9 years ago
parent
f43cb14bd2
commit
ad88dec629
3 changed files with 18 additions and 145 deletions
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  1. +10
    -0
      examples/BarometricPressureSensor/BarometricPressureSensor.ino
  2. +0
    -143
      examples/BarometricPressureSensor/BarometricPressureSensor/BarometricPressureSensor.ino
  3. +8
    -2
      examples/DigitalPotControl/DigitalPotControl.ino

+ 10
- 0
examples/BarometricPressureSensor/BarometricPressureSensor.ino View File

// now combine the address and the command into one byte // now combine the address and the command into one byte
byte dataToSend = thisRegister & READ; byte dataToSend = thisRegister & READ;
Serial.println(thisRegister, BIN); Serial.println(thisRegister, BIN);
// gain control of the SPI port
// and configure settings
SPI.beginTransaction(SPISettings(4000000, MSBFIRST, SPI_MODE0));
// take the chip select low to select the device: // take the chip select low to select the device:
digitalWrite(chipSelectPin, LOW); digitalWrite(chipSelectPin, LOW);
// send the device the register you want to read: // send the device the register you want to read:
} }
// take the chip select high to de-select: // take the chip select high to de-select:
digitalWrite(chipSelectPin, HIGH); digitalWrite(chipSelectPin, HIGH);
// release control of the SPI port
SPI.endTransaction();
// return the result: // return the result:
return(result); return(result);
} }
// now combine the register address and the command into one byte: // now combine the register address and the command into one byte:
byte dataToSend = thisRegister | WRITE; byte dataToSend = thisRegister | WRITE;


// gain control of the SPI port
// and configure settings
SPI.beginTransaction(SPISettings(4000000, MSBFIRST, SPI_MODE0));
// take the chip select low to select the device: // take the chip select low to select the device:
digitalWrite(chipSelectPin, LOW); digitalWrite(chipSelectPin, LOW);




// take the chip select high to de-select: // take the chip select high to de-select:
digitalWrite(chipSelectPin, HIGH); digitalWrite(chipSelectPin, HIGH);
// release control of the SPI port
SPI.endTransaction();
} }



+ 0
- 143
examples/BarometricPressureSensor/BarometricPressureSensor/BarometricPressureSensor.ino View File

/*
SCP1000 Barometric Pressure Sensor Display
Shows the output of a Barometric Pressure Sensor on a
Uses the SPI library. For details on the sensor, see:
http://www.sparkfun.com/commerce/product_info.php?products_id=8161
http://www.vti.fi/en/support/obsolete_products/pressure_sensors/
This sketch adapted from Nathan Seidle's SCP1000 example for PIC:
http://www.sparkfun.com/datasheets/Sensors/SCP1000-Testing.zip
Circuit:
SCP1000 sensor attached to pins 6, 7, 10 - 13:
DRDY: pin 6
CSB: pin 7
MOSI: pin 11
MISO: pin 12
SCK: pin 13
created 31 July 2010
modified 14 August 2010
by Tom Igoe
*/

// the sensor communicates using SPI, so include the library:
#include <SPI.h>

//Sensor's memory register addresses:
const int PRESSURE = 0x1F; //3 most significant bits of pressure
const int PRESSURE_LSB = 0x20; //16 least significant bits of pressure
const int TEMPERATURE = 0x21; //16 bit temperature reading
cont byte READ = 0b00000000; // SCP1000's read command
const byte WRITE = 0b00000010; // SCP1000's write command
// pins used for the connection with the sensor
// the other you need are controlled by the SPI library):
const int dataReadyPin = 6;
const int chipSelectPin = 7;

void setup() {
Serial.begin(9600);

// start the SPI library:
SPI.begin();

// initalize the data ready and chip select pins:
pinMode(dataReadyPin, INPUT);
pinMode(chipSelectPin, OUTPUT);

//Configure SCP1000 for low noise configuration:
writeRegister(0x02, 0x2D);
writeRegister(0x01, 0x03);
writeRegister(0x03, 0x02);
// give the sensor time to set up:
delay(100);
}

void loop() {
//Select High Resolution Mode
writeRegister(0x03, 0x0A);

// don't do anything until the data ready pin is high:
if (digitalRead(dataReadyPin) == HIGH) {
//Read the temperature data
int tempData = readRegister(0x21, 2);

// convert the temperature to celsius and display it:
float realTemp = (float)tempData / 20.0;
Serial.print("Temp[C]=");
Serial.print(realTemp);


//Read the pressure data highest 3 bits:
byte pressure_data_high = readRegister(0x1F, 1);
pressure_data_high &= 0b00000111; //you only needs bits 2 to 0

//Read the pressure data lower 16 bits:
unsigned int pressure_data_low = readRegister(0x20, 2);
//combine the two parts into one 19-bit number:
long pressure = ((pressure_data_high << 16) | pressure_data_low)/4;

// display the temperature:
Serial.println("\tPressure [Pa]=" + String(pressure));
}
}

//Read from or write to register from the SCP1000:
unsigned int readRegister(byte thisRegister, int bytesToRead ) {
byte inByte = 0; // incoming byte from the SPI
unsigned int result = 0; // result to return

// SCP1000 expects the register name in the upper 6 bits
// of the byte. So shift the bits left by two bits:
thisRegister = thisRegister << 2;
// now combine the address and the command into one byte
dataToSend = thisRegister & READ;

// take the chip select low to select the device:
digitalWrite(chipSelectPin, LOW);
// send the device the register you want to read:
SPI.transfer(dataToSend);
// send a value of 0 to read the first byte returned:
result = SPI.transfer(0x00);
// decrement the number of bytes left to read:
bytesToRead--;
// if you still have another byte to read:
if (bytesToRead > 0) {
// shift the first byte left, then get the second byte:
result = result << 8;
inByte = SPI.transfer(0x00);
// combine the byte you just got with the previous one:
result = result | inByte;
// decrement the number of bytes left to read:
bytesToRead--;
}
// take the chip select high to de-select:
digitalWrite(chipSelectPin, HIGH);
// return the result:
return(result);
}


//Sends a write command to SCP1000

void writeRegister(byte thisRegister, byte thisValue) {

// SCP1000 expects the register address in the upper 6 bits
// of the byte. So shift the bits left by two bits:
thisRegister = thisRegister << 2;
// now combine the register address and the command into one byte:
dataToSend = thisRegister | WRITE;

// take the chip select low to select the device:
digitalWrite(chipSelectPin, LOW);

SPI.transfer(dataToSend); //Send register location
SPI.transfer(thisValue); //Send value to record into register

// take the chip select high to de-select:
digitalWrite(chipSelectPin, HIGH);
}




+ 8
- 2
examples/DigitalPotControl/DigitalPotControl.ino View File

*/ */




// inslude the SPI library:
// include the SPI library:
#include <SPI.h> #include <SPI.h>




void setup() { void setup() {
// set the slaveSelectPin as an output: // set the slaveSelectPin as an output:
pinMode (slaveSelectPin, OUTPUT); pinMode (slaveSelectPin, OUTPUT);
pinMode (slaveSelectPin, HIGH);
// initialize SPI: // initialize SPI:
SPI.begin(); SPI.begin();
} }
} }


void digitalPotWrite(int address, int value) { void digitalPotWrite(int address, int value) {
// gain control of the SPI port
// and configure settings
SPI.beginTransaction(SPISettings(4000000, MSBFIRST, SPI_MODE0));
// take the SS pin low to select the chip: // take the SS pin low to select the chip:
digitalWrite(slaveSelectPin,LOW); digitalWrite(slaveSelectPin,LOW);
// send in the address and value via SPI: // send in the address and value via SPI:
SPI.transfer(address); SPI.transfer(address);
SPI.transfer(value); SPI.transfer(value);
// take the SS pin high to de-select the chip: // take the SS pin high to de-select the chip:
digitalWrite(slaveSelectPin,HIGH);
digitalWrite(slaveSelectPin,HIGH);
// release control of the SPI port
SPI.endTransaction();
} }

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