Update examples to use transactions

examples/BarometricPressureSensor/BarometricPressureSensor.ino

@@ -96,6 +96,9 @@ unsigned int readRegister(byte thisRegister, int bytesToRead ) {
   // now combine the address and the command into one byte
   byte dataToSend = thisRegister & READ;
   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:
   digitalWrite(chipSelectPin, LOW);
   // send the device the register you want to read:
@@ -116,6 +119,8 @@ unsigned int readRegister(byte thisRegister, int bytesToRead ) {
   }
   // take the chip select high to de-select:
   digitalWrite(chipSelectPin, HIGH);
+  // release control of the SPI port
+  SPI.endTransaction();
   // return the result:
   return(result);
 }
@@ -131,6 +136,9 @@ void writeRegister(byte thisRegister, byte thisValue) {
   // now combine the register address and the command into one byte:
   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:
   digitalWrite(chipSelectPin, LOW);
 
@@ -139,5 +147,7 @@ void writeRegister(byte thisRegister, byte thisValue) {
 
   // take the chip select high to de-select:
   digitalWrite(chipSelectPin, HIGH);
+  // release control of the SPI port
+  SPI.endTransaction();
 }
 

examples/BarometricPressureSensor/BarometricPressureSensor/BarometricPressureSensor.ino

@@ -1,143 +0,0 @@
-/*
-  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); 
-}
-
-
-

examples/DigitalPotControl/DigitalPotControl.ino

@@ -27,7 +27,7 @@
 */
 
 
-// inslude the SPI library:
+// include the SPI library:
 #include <SPI.h>
 
 
@@ -37,6 +37,7 @@ const int slaveSelectPin = 10;
 void setup() {
   // set the slaveSelectPin as an output:
   pinMode (slaveSelectPin, OUTPUT);
+  pinMode (slaveSelectPin, HIGH);
   // initialize SPI:
   SPI.begin(); 
 }
@@ -61,11 +62,16 @@ void loop() {
 }
 
 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:
   digitalWrite(slaveSelectPin,LOW);
   //  send in the address and value via SPI:
   SPI.transfer(address);
   SPI.transfer(value);
   // take the SS pin high to de-select the chip:
-  digitalWrite(slaveSelectPin,HIGH); 
+  digitalWrite(slaveSelectPin,HIGH);
+  // release control of the SPI port
+  SPI.endTransaction();
 }