Anyway, when arduino boots, the following code executes until the while( Wire.available() < 2 ) and never returns.
Any idea why? BTW, when powering up the SRF02, it blinks one long blink cooresponding to default address. I have 2 units and get the same behavior when i swap them out.
/*
Generic example for the SRF modules 02, 08, 10 and 235.
Only the SRF08 uses the light saensor so when any other
range finder is used with this code the light reading will
be a constant value.
*/
#include <Wire.h>
#include <SoftwareSerial.h>
#define rxPin 2 // Software serial pin for rx
#define txPin 3 // Software serial pin for tx
#define srfAddress 0x70 // Address of the SRF08
#define cmdByte 0x00 // Command byte
#define lightByte 0x01 // Byte to read light sensor
#define rangeByte 0x02 // Byte for start of ranging data
#define clrScrn 0x0C // Byte to clear LCD03 screen
#define mvCsr 0x02 // Byte to tell LCD03 we wish to move cursor
#define hideCsr 0x04 // Byte to hide the cursor
//SoftwareSerial lcd_03 = SoftwareSerial(rxPin, txPin); // defines a new software serial port for lcd_03
byte highByte = 0x00; // Stores high byte from ranging
byte lowByte = 0x00; // Stored low byte from ranging
void setup(){
// lcd_03.begin(9600); // Begins serial port for LCD_03
Wire.begin();
Serial.begin(57600);
delay(100); // Waits to make sure everything is powered up before sending or receiving data
// pinMode(rxPin, INPUT);
// pinMode(txPin, OUTPUT);
// lcd_03.print(clrScrn, BYTE);
// lcd_03.print(hideCsr, BYTE);
//lcd_03.println("SRF02/08/10/235");
int softRev = getSoft(); // Calls function to get software revision
Serial.print("Software version: ");
Serial.print( softRev ) ;
}
void loop(){
int rangeData = getRange(); // Calls a function to get range
Serial.print("Range = ");
Serial.print(rangeData); // Print rangeData to LCD03
Serial.println();
delay(100); // Wait before looping
}
int getRange(){ // This function gets a ranging from the SRF08
int range = 0;
Serial.println("Before Trans:");
Wire.beginTransmission(srfAddress); // Start communticating with SRF08
Wire.send(cmdByte); // Send Command Byte
Wire.send(0x51); // Send 0x51 to start a ranging
Wire.endTransmission();
Serial.println("End Wire Trans");
delay(100); // Wait for ranging to be complete
Serial.println("Before SRF Mod");
Wire.beginTransmission(srfAddress); // start communicating with SRFmodule
Wire.send(rangeByte); // Call the register for start of ranging data
Wire.endTransmission();
Serial.println("Getting Range");
Wire.requestFrom(srfAddress, 2); // Request 2 bytes from SRF module
while(Wire.available() < 2) // Wait for data to arrive
{
// Never gets out of this loop. I GET STUCK RIGHT HERE**************************
}
highByte = Wire.receive(); // Get high byte
lowByte = Wire.receive(); // Get low byte
Serial.println("Done");
range = (highByte <<
+ lowByte; // Put them togetherreturn(range); // Returns Range
}
int getSoft(){ // Function to get software revision
Wire.beginTransmission(srfAddress); // Begin communication with the SRF module
Wire.send(cmdByte); // Sends the command bit, when this bit is read it returns the software revision
Wire.endTransmission();
Wire.requestFrom(srfAddress, 1); // Request 1 byte
while(Wire.available() < 0); // While byte available
int software = Wire.receive(); // Get byte
return(software);
}
