pacogh

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• Pixl.js & MCP23017 connected using I2C

  @pacogh started

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  @pacogh replied
• Pixl.js & MCP23017 connected using I2C

  in Puck.js, Pixl.js and MDBT42 • 5 years, 7 months

  

  Hi Gordon,

  http://microcosm.app/out/zEd6h is full working but it was not simple for me to understand how it manages I2C bus.

  I printed data sent from Espruino to MCP23017 thru function ' p._w = function(r,dArr) { this.i2c.writeTo(0x20,r,dArr); print (r,dArr); return this; }; '

  Comparing it with MCP23017 it was easy to write minimun code to use bank A & B as output.

  Other experiences:

  • I'm using a power Bank using 'alway-on mode' instead of a button battery, so power wasn't the problem as 'allObjects' sujected too.
    
  • My previous design was running on Arduino, my mistake was transtlate that Arduino code to Espruino. Espruino needs other detailed commands to manage I2C (attached Arduino example)
    
    

  Thanks,

• Pixl.js & MCP23017 connected using I2C

  in Puck.js, Pixl.js and MDBT42 • 5 years, 7 months

  

  Hi,

  Your post is at http://forum.espruino.com/conversations/­312487/

  Attachment that helped me to clarify how MCP2307 is working is: https://espruino.microcosm.app/api/v1/fi­les/e9474e4809d42cf2aa0a28c9377a4c4987ee­1b72.js
  and MCP2307 datasheet.

  Thanks

• Pixl.js & MCP23017 connected using I2C

  in Puck.js, Pixl.js and MDBT42 • 5 years, 7 months

  

  Hi,
  Thanks for your answer, your port expader is a really excellent job for reading a keypad.
  I tested your software and it changes signal output of GPA0, GPA1, GPA2, GPA3 to '1'. !!

  Reading your code, I solved my problem. Attached is a simple example of a '0' & '1' signal serie.

  Thanks a lot!!!!!!!,

  Paco.

• Pixl.js & MCP23017 connected using I2C

  in Puck.js, Pixl.js and MDBT42 • 5 years, 7 months

  

  Hi,
  I have connected a port expander MCP23017 to pixl.js using I2c (using D5 for scl : D5 and D4 for sda)
  My target is to use MCP 23017 for reading or writing some signal.

  There are instructions in https://www.espruino.com/MCP23xxx but it doesn't work for reading or writing:
  It doesn't reports error messages, here is the code:

     var i2c = new I2C();
     i2c.setup({ scl : D5, sda: D4 });
     var address = 0x20; //this is the address, set by the address pins.
     // for MCP23017
     var port=require("MCP23017").connect(i2c,nul­l,address);
     port.B0.mode('output');
     port.B0.write(1);      //<--IT MUST CHANGE TO '1' BUT B0 CONTINUE AT '0' LEVEL 
    port.A0.mode('input_pullup');
   console.log(port.A0.read());    //<--ALWAYS READ '1'
  

  I wrote a new code and now is working just for reading signals:

     var i2c = new I2C();
     i2c.setup({ scl : D5, sda: D4 });     
     i2c.writeTo(0x20, 0X12); 
     var x = i2c.readFrom(0x20, 1);  
     i2c.writeTo(0x20, 0X13); 
     var y = i2c.readFrom(0x20, 1);
  

  But for writing , it doesn't work:

     var i2c = new I2C();
     i2c.setup({ scl : D5, sda: D4});
     i2c.writeTo(0x20, 0x00);
     i2c.writeTo(0x20, 0x12);      // program all Bank A to output
     i2c.writeTo(0x20, 0x00);
     i2c.writeTo(0x20, 0x00);
     i2c.writeTo(0x20, 0x12);      // Change all pins of Bank A to '1'
    i2c.writeTo(0x20, 0xFF);
  
  i2c.writeTo(0x20, 0x13);      // program all Bank B to output     
  i2c.writeTo(0x20, 0x00);
  i2c.writeTo(0x20, 0x00);
  i2c.writeTo(0x20, 0x13);      // Change all pins of Bank B to '1'
  i2c.writeTo(0x20, 0xFF); 
  

  Some help, please?
  Thans in advance.

  Paco