PGA460PSM EVM (pga460-q1) with arduino mega (Texas Instruments)

Other Hardware Sensors
1

Hi,
I am trying to interface Arduino mega with the following ultrasonic sensor module pga460-q1 . I tried to read the distance by UART but nothing helps. I tried their official energia library which is ported for arduino (PGA460EnergiaLibrary_v1.0.9_Arduino.zip attached) , but I always get the error which states that the sensor is not found. I also tried the following code

//note: minimum requirement example used to send a burst/listen command to PGA460


//cmd 0 - p1 burst listen
byte buf0[4] = {0x55, 0x00, 0x01, 0xFE};
//cmd 1 - p2 burst listen
byte buf1[4] = {0x55, 0x01, 0x01, 0xFD};
//cmd 5 - ultrasonic measurement (assume UART_ADDR=0)
byte buf5[3] = {0x55, 0x05, 0xFA}; //change
//cmd 10 - register write decple to time of 4.096ms
byte buf10[5] = {0x55, 0x0A, 0x26, 0x00, 0xCF};
//cmd 17 - broadcast p1 burst listen
byte buf17[4] = {0x55, 0x11, 0x01, 0xED};
//cmd 19 - broadcast p1 listen only
byte buf19[4] = {0x55, 0x13, 0x01, 0xEB};
//cmd 25 - broadcast bulk threshold write
byte buf25[35] =  {0x55, 0x19, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x84, 0x21, 0x08, 0x42, 0x10, 0x80, 0x80, 0x80, 0x80, 0x00, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88, 0x84, 0x21, 0x08, 0x42, 0x10, 0x80, 0x80, 0x80, 0x80, 0x00, 0x7C};

//byte buf00[6]={0x00,0x00,0x00,0x00,0x00,0x00};
//byte data[6]= {0x00,0x00,0x00,0x00,0x00,0x00};
const int buttonPin = 1;     // the number of the pushbutton pin
const int ledPin = 13;      // the number of the LED pin
int buttonState = 0;         // variable for reading the pushbutton status

void setup() { 

  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);
  delay(1000);
  
  // put your setup code here, to run once:
  Serial.begin(19200);
  Serial1.begin(19200,SERIAL_8N2);  // initialize PGA460 UART serial channel
  delay(1000);

  //assume UART_ADDR=0
  //bulk threshold write mid-code values to clear THR_CRC_ERR
  Serial1.write(buf25, sizeof(buf25));
  delay(100);
 
  // set UART_ADDR=0's time decouple to 4.096ms
  Serial1.write(buf10, sizeof(buf10));
  delay(100);
}

void loop() {
    // put your main code here, to run repeatedly: 
  
    // check if the pushbutton is pressed.
    //while (digitalRead(buttonPin) == LOW){}
    
    // broadcast p1 burst+listen (non-dependent on UART_ADDR)
    Serial1.write(buf17, sizeof(buf17));
    
    // delay by 100ms
    delay(100);

    //[TODO] print ultrasonic measurement results on terminal
    // read back ultrasonic meas results from UART_ADDR=0
    Serial1.write(buf5, sizeof(buf5));//Serial1
   /* for (int i=0 ;i<=5;i++)
    {
    buf00[i] = Serial1.read();
    }*/
   /* for (int i=0 ;i<=5;i++)
    {
    data[i] = Serial1.read();
    }*/
    //SerialUSB.write(data,sizeof(data));
    Serial.println(Serial1.read());
    // toggle red LED
    digitalWrite(ledPin, !(digitalRead(ledPin)));   // turn the LED on (HIGH is the voltage level)

    // repeat loop every second
    delay (1000);      
}

But nothing works .
To be noted I am using 2 stop bit UART , I did a voltage divider to convert my arduino voltage from 5V (Arduino mega TX) to 3.3V (module RX) , , also pulled down the SCK so that it is not floating, Any one please help!!

PGA460_USSC.cpp (102 KB)

PGA460_USSC.h (3.09 KB)

Revision_Notes.txt (1.83 KB)

2

You forgot the most important information: the wiring diagram!

To be noted I am using 2 stop bit UART , I did a voltage divider to convert my arduino voltage from 5V (Arduino mega TX) to 3.3V (module RX)

According to the documentation the evalution board expects 6 to 28V input voltage, the 5V of the Arduino Mega 2560 isn't enough.

3

Sir,
I have given a seperate 12V supply for the sensor and common ground for the arduino , also a voltage divider from TX of arduino to RX of the sensor ( 5v logic to 3.3v logic)

4

Post a wiring diagram! May be hand-drawn.

5

Sorry for late reply will post the diagram. Does the pga460 give a default 3.3V in the Rx pin? ( not connected to arduino just power supply given) and Tx pin gives no voltage (0V) ? Is that correct?

6

Does the pga460 give a default 3.3V in the Rx pin?

Using the evaluation board's circuitry this is to be expected as the TEST pin is not connected so it cannot have a voltage > 2V during startup. I assume you mean the RX pin of the Arduino side, so it's the PGA460's TX pin and so the PGA460's RX pins has 0V (as it's an input pin for the chip).

7

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