Slight variations including {0x49} or {0x01, 0x02, 0x03, 0x04} being
inserted instead for request byte[] and response byte varying in size from
0 to 80.
Always giving me an output of 0's or a scrambled String, however when that
happens its possible I'm just not performing the proper conversion from a
byte array to a readable string of binary digits?
On Thursday, April 17, 2014 4:29:20 PM UTC-4, Brad E wrote:
>
> Pretty lost on reading data from a temperature sensor (Texas Instruments
> TMP75) through an I2C. Could really use some help. |=(
>
> I'm 99.9% sure this is the
> datasheet<http://www.ti.com/lit/ds/sbos288j/sbos288j.pdf>I should be using
> for the sensor chip. Only not 100% because I searched
> online for it as the chip was removed from an apple device.
>
> The sensor is connected to the SDA & SCL 2 pins located @ pin #s: 25 & 26.
> Therefore my TWI interface is opened as such:
>
> twi = ioio_.openTwiMaster(2, TwiMaster.Rate.RATE_100KHz, false);
>
>
> It is also connected to a 5v pin and a ground pin.
>
> Testing with a multimeter, I've seen that all the address pins (A2, A1,
> A0) are all grounded. Therefore, according to the datasheet, I should be
> addressing the slave as such:
>
> address = 1001011;
>
> if(twi.writeRead(address, false, request, request.length, response,
> response.length))
>
> /*...Write Success...*/
>
> else
>
> /*...Write Fail...*/
>
>
> However, something must be wrong because every time I run the
> activity(with slight variations) I'm receiving a Fail, the code is skipped
> over entirely, stops right then & there at the write/read line, or (as it
> is doing right now) breaking the connection with the IOIO board and
> restarting the entire Looper class repeatedly.
>
> Any advice, guidance, or help whatsoever would be greatly greatly
> appreciated. Much thanks. (=]]
> All my best,
> Brad E
>
> p.s. total code in case relevant:
>
> package ioio.examples.hello;
>
> public class Temperature extends IOIOActivity {
> private static TextView tempReadOutView;
> byte[] request;
> byte[] response;
> int address;
> TwiMaster twi;
> int runs = 0;
> int duration;
> Context context;
> String decoded = "";
> @Override
> protected void onCreate(Bundle savedInstanceState) {
> super.onCreate(savedInstanceState);
> setContentView(R.layout.templayout);
> }
>
> class Looper extends BaseIOIOLooper {
> @Override
> protected void setup() throws ConnectionLostException,
> InterruptedException {
> displayTemp("IOIO Connected");
> twi = ioio_.openTwiMaster(2, TwiMaster.Rate.RATE_100KHz, false);
> request = new byte[] {0x01, 0x02};
> response = new byte[1];
> address = 1001011; //or 1001000
> displayTemp("Set up Done");
> if(twi.writeRead(address, false, request, request.length, response,
> response.length))
> displayTemp("True");
> else
> displayTemp("False");
> }
>
> public void loop() throws ConnectionLostException, InterruptedException {
>
> }
> }
> @Override
> protected IOIOLooper createIOIOLooper() {
> return new Looper();
> }
> public void displayTemp(final String str) throws InterruptedException {
> Thread.sleep(1200);
> runOnUiThread(new Runnable() {
> @Override
> public void run() {
> context = getApplicationContext();
> duration = Toast.LENGTH_SHORT;
> Toast toast = Toast.makeText(context, str, duration);
> toast.show();
> }
> });
> }
> }
>
>
>
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