CCS/LAUNCHXL-CC2650: LAUNCHPAD CC2650 / I2C / LED Driver LP55231

Tool/software: Code Composer Studio

Hello,

I struggle to get just LED lighted using the TI driver  LP55231 (actually the breakout from sparkfun) connected to the Launchpad CC2650 using BLE to send the instruction to light the LED (the LED driver is directly connected to the Launchpad).

The Pins I'm using:

SCL = DI05 (launchpad)

SDA = DI04 (launchpad)

EN = high (3.3v from launchpad)

I've started with Project 0 for Launchpad, it worked ok, then I want to send data using I2C when I light up let's say LED1 over BLE1:

case LS_LED1_ID:
      Log_info3("Value Change msg: %s %s: %s",
                (IArg)"LED Service",
                (IArg)"LED1",
                (IArg)pretty_data_holder);

      // Locals
      uint8_t rxBuffer[32];            // Receive buffer
      uint8_t txBuffer[32];            // Transmit buffers

      I2C_Handle handle;
      I2C_Params params;
      I2C_Transaction i2cTrans;

      // Configure I2C parameters.
      I2C_Params_init(&params);

      params.transferMode = I2C_MODE_BLOCKING;
      params.bitRate =  I2C_400kHz;

      //params.transferCallbackFxn = transferCallback;

      txBuffer[0] = 0x3D; // Reset register
      txBuffer[1] = 0xFF; // value Reset

      Log_info1("txBuf %x",txBuffer[0]);

      // Initialize master I2C transaction structure
      i2cTrans.writeCount   = 2;
      i2cTrans.writeBuf     = txBuffer;
      i2cTrans.readCount    = 0;
      i2cTrans.readBuf      = NULL;
      i2cTrans.slaveAddress = 0x32;

      // Open I2C
      handle = I2C_open(Board_I2C, &params);

      if (handle == NULL ) {
          Log_info0("Problem opening I2C");

      }
      else {
          Log_info0("Ok I2C open");
      }
      // Do I2C transfer (in callback mode)
      I2C_transfer(handle, &i2cTrans);

      txBuffer[2] = 0x00; // Enable register
      txBuffer[3] = 0x40; // LP55231 enabled
      I2C_transfer(handle, &i2cTrans);

      Task_sleep(5 * (1000/Clock_tickPeriod)); // let's wait 5ms

      txBuffer[4] = 0x36;
      txBuffer[5] = 0x53;
      I2C_transfer(handle, &i2cTrans);

      txBuffer[6] = 0x26;
      txBuffer[7] = 0x5B;
      I2C_transfer(handle, &i2cTrans);

      txBuffer[8] = 0x16;
      txBuffer[9] = 0x80;
      I2C_transfer(handle, &i2cTrans);

      Log_info1("after I2C_transfer function %x",(IArg)i2cTrans.writeBuf);

      I2C_close(handle);
      Log_info0("after I2C_close function");

      break;

  default:
    return;
  }

I've tried many things but cannot get anything functioning.

My sequence of data sent is: Reset + Start + D1 current control set + PWM 50%.

Does it seems ok for you?  Would you have any idea?

Thanks,

JM