Hi,
We are trying to get this code to work on Particle Xenon, but so far I get some values but they appear wrong, and eventually the device freezes. I suspect it is due to the different way Particle handles SPI ?
//#include <SPI.h>
// Memory register addresses:
const int XDATA3 = 0x08;
const int XDATA2 = 0x09;
const int XDATA1 = 0x0A;
const int YDATA3 = 0x0B;
const int YDATA2 = 0x0C;
const int YDATA1 = 0x0D;
const int ZDATA3 = 0x0E;
const int ZDATA2 = 0x0F;
const int ZDATA1 = 0x10;
const int RANGE = 0x2C;
const int POWER_CTL = 0x2D;
// Device values
const int RANGE_2G = 0x01;
const int RANGE_4G = 0x02;
const int RANGE_8G = 0x03;
const int MEASURE_MODE = 0x06; // Only accelerometer
// Operations
const int READ_BYTE = 0x01;
const int WRITE_BYTE = 0x00;
// Pins used for the connection with the sensor
const int CHIP_SELECT_PIN = A2;
void setup() {
Serial.begin(9600);
SPI.begin();
// Initalize the data ready and chip select pins:
pinMode(CHIP_SELECT_PIN, OUTPUT);
SPI.setClockDividerReference(SPI_CLK_ARDUINO);
SPI.setBitOrder(MSBFIRST);
SPI.setClockSpeed(15, MHZ);
//Configure ADXL355:
writeRegister(RANGE, RANGE_2G); // 2G
writeRegister(POWER_CTL, MEASURE_MODE); // Enable measure mode
// Give the sensor time to set up:
delay(100);
}
void loop() {
int axisAddresses[] = {XDATA1, XDATA2, XDATA3, YDATA1, YDATA2, YDATA3, ZDATA1, ZDATA2, ZDATA3};
int axisMeasures[] = {0, 0, 0, 0, 0, 0, 0, 0, 0};
int dataSize = 9;
// Read accelerometer data
readMultipleData(axisAddresses, dataSize, axisMeasures);
// Split data
int xdata = (axisMeasures[0] >> 4) + (axisMeasures[1] << 4) + (axisMeasures[2] << 12);
int ydata = (axisMeasures[3] >> 4) + (axisMeasures[4] << 4) + (axisMeasures[5] << 12);
int zdata = (axisMeasures[6] >> 4) + (axisMeasures[7] << 4) + (axisMeasures[8] << 12);
// Apply two complement
if (xdata >= 0x80000) {
xdata = ~xdata + 1;
}
if (ydata >= 0x80000) {
ydata = ~ydata + 1;
}
if (zdata >= 0x80000) {
zdata = ~zdata + 1;
}
// Print axis
Serial.print("X=");
Serial.println(xdata);
Serial.println("\t");
Serial.print("Y=");
Serial.print(ydata);
Serial.println("\t");
Serial.print("Z=");
Serial.print(zdata);
Serial.println("\n");
// Next data in 100 milliseconds
delay(1000);
}
/*
* Write registry in specific device address
*/
void writeRegister(byte thisRegister, byte thisValue) {
byte dataToSend = (thisRegister << 1) | WRITE_BYTE;
digitalWrite(CHIP_SELECT_PIN, LOW);
SPI.transfer(dataToSend);
SPI.transfer(thisValue);
digitalWrite(CHIP_SELECT_PIN, HIGH);
}
/*
* Read registry in specific device address
*/
unsigned int readRegistry(byte thisRegister) {
unsigned int result = 0;
byte dataToSend = (thisRegister << 1) | READ_BYTE;
digitalWrite(CHIP_SELECT_PIN, LOW);
SPI.transfer(dataToSend);
result = SPI.transfer(0x00);
digitalWrite(CHIP_SELECT_PIN, HIGH);
return result;
}
/*
* Read multiple registries
*/
void readMultipleData(int *addresses, int dataSize, int *readedData) {
digitalWrite(CHIP_SELECT_PIN, LOW);
for(int i = 0; i < dataSize; i = i + 1) {
byte dataToSend = (addresses[i] << 1) | READ_BYTE;
SPI.transfer(dataToSend);
readedData[i] = SPI.transfer(0x00);
}
digitalWrite(CHIP_SELECT_PIN, HIGH);
}
If anyone can glance at this code and point me in the right direction I’d be very grateful !!
Thanks
