Timeout on I2C Write BUSY - not all the time [Adafruit 8x8 matrix backpack]

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•

Mrbbp
On an arduino there is no pullup resistor to add to circuit.
i tested with an other backpack, same result.
some time it works, sometime not.

i tried with a try catch and resend a I2C.setup() (read it in the forum) in the resend with no more result.
```
  try {
    I2C1.writeTo(0x70, 0x21); // turn on oscillator
  } catch(e) {
    I2C1.setup({scl: B6,sda: B7});
    setTimeout(function() {
      console.log("try again");
      try {
        I2C1.writeTo(0x70, 0x21); // turn on oscillator
      } catch(e) {
        console.log("does not init",e);
      }
    }, 100);
  }
```
other idea?
is there a way to loop on a init phase 'til it works? (a loop on the "try catch")?

•

Robin in reply to @Mrbbp

Thr 2019.12.19

'is there a way to loop on a init phase 'til it works? (a loop on the "try catch")?'

Hello @Mrbbp, would you be so kind as to upload the output for the above snippet? Although L1,L2,L3 and L13 are not adding any value here, (as I2C is not setup by L2, an immediate error should be thrown - maybe the intention of the outer try/catch?) the output should fill multiple "try again" messages with two bytes placed on the I2C bus each 100msec, unless/until an error is detected, in which case "does not init < error msg detail here >" should display.

Effectively, you have the looping mechanism you are after. 100msec may be too fast for the left hand console panel of the WebIDE to keep up though.

Any additional detail in the WebIDE console output?
WebIDE >> Settings >> Console

•

Mrbbp in reply to @Robin

@Robin
i give you more off my onInit()

const onInit = function() {
  clearInterval();
  clearWatch();
  pinMode(B6, 'opendrain');
  pinMode(B7, 'opendrain');
  require("Font4x6").add(Graphics);
  /* rajouter les init de connexion pour le display */
  // initialisation I2C
  I2C1.setup({scl: B6,sda: B7});
  // rouge
  try {
    I2C1.writeTo(0x70, 0x21); // turn on oscillator
  } catch(e) {
    I2C1.setup({scl: B6,sda: B7});
    setTimeout(function() {
      console.log("try again");
      try {
        I2C1.writeTo(0x70, 0x21); // turn on oscillator
      } catch(e) {
        console.log("does not init",e);
      }
    }, 500);
  }

    console.log("init I2C");
    // init suite I2C
    I2C1.writeTo(0x70, 0x81); // display on
    I2C1.writeTo(0x70, 0xE0 | 0); // luminosité 0-15
    digitalPulse(LED2,1,20);
    setTimeout(envoieMatrice, 2000);
};

and the output.
It does not loop
it try once as in the code
if i well understand, it fail on the first communication

init I2C
Uncaught InternalError: Timeout on I2C Write BUSY
 at line 1 col 541
... I2C'),I2C1.writeTo(112,129),I2C1.writeTo(112,224),digitalPu...
                              ^
in function called from system
try again
does not init InternalError: InternalError: Timeout on I2C Write BUSY
>

Timeout on I2C Write BUSY - not all the time [Adafruit 8x8 matrix backpack]

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