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Development Log

July 02

  • Checked libmcp2221 i2c functions limit on writing (60 bytes max, not an issue for our purposes)

  • Incorporated libmcp2221 i2c functions into self-defined MCP2221A library.

  • [MCP2221A library] Completed proxy functions to substitute I2C devices. Tested writing dummy I2C packets into text files.

  • [PCA9685 library] Incorporated MCP2221A functions for I2C protocols.

  • [IO library] Re-structured input (UI) and output (text file output) into IO module.

  • TODO:

    1. Test functions from top level. Note for self: need to deal with functions reporting errors now for lack of hardware.
    2. Implement [PCA9685] functions: global restart (reset?), write to all mode, sleep mode.

July 07

  • Checked libmcp2221 library: not fully implemented, poor completion and hard to test.
  • TODO:
    1. Read MCP2221 dll User guide.
    2. Implement into MCP class

July 09

  • Implemented MCP2221 dll proprietary library. (Not tested as to many errors and cannot compile)
  • Integrated modules such that program can compile without errors, using proxy functions.
  • The MCP2221 dll library takes care of the I2C bus specifics, i.e. to write to a slave, one simply invoke:
    Mcp2221_I2cWrite(void* handle, unsigned int bytesToWrite, unsigned char slaveAddress, unsigned char use7bitAddress, unsigned char* i2cTxData)
  • Therefore, current code does not concern the various commands. Proxy I2C function writes to a text file with slave address / reg/ reg data/ ....
  • TODO:
    • More test cases, esp. edge cases
    • error checking/ guarding
    • PWM with different delay scenarios
    • Restart (write to all 0)

July 10

  • Re-structured code such that now we have 4 core master functions:

    1. int PCA_master_init(int numDevices);
      Called at beginning, return array of (numDevices) PCA structs
    2. int PCA_master_writePWM(writePWM_state mode);
      Asks for input and set specific device/channel/PWM
      Two modes: BATCH (writes to all registers according to array)
      SINGLE (writes to specific device/channels without changing existing modes)
    3. int PCA_master_restart();
      Reset all values to 0.
    4. int PCA_master_getState();
      Prints out all active channels information from each device.

  • Divided PCA9685.c: functions are now in categories:

    1. Master functions (PCA_master_*): master functions called by the top level UI. Usually passed in array of 7 drivers (PCA structs), has control over 7 drivers.
    2. PCA driver functions (PCA_*): driver-functions, only has knowledge of single driver.
    3. I2C and register level functions: takes care of I2C, writing to registers, and proxy for writing to registers in the absence of driver hardware to test with. Users should change the functions here should a different I2C driver be used.
    4. Auxiliary functions: Miscellaneous functions.

  • TODO:

    • More test cases, esp. edge cases
    • error checking/ guarding
    • PWM with different delay scenarios

July 13

  • Compiled and tested Top level functions with valgrind. Code is working
  • TODO:
    • More test cases, esp. edge cases
    • error checking/ guarding
    • PWM with different delay scenarios

July 14

  • Implemented error checking for top master functions. Tested.
  • Program now asks if user is finished configuring after each input. Allows for multi-channel configuration in SINGLE mode.
  • TODO
    • Edge cases
    • Different PWM delay
    • Check the remaining three function groups.
    • Complete documentation.

July 15

  • Revised and fixed MCP I2C writing. Matched proxy I2C write arguments with real i2c functions.
  • PWM convert: Added support for cases when off occurs before on in a period.
  • Current implementation sets delay to be 10% in-function.
  • Tested output commands in proxy, confirmed same output as per the PCA9685 datasheet (page 16, LED Output and PWM control)
  • Tested writing to edge devices and channels (device 1 and 7, channel 1 and 16)
  • TODO
    • Check whether need to add support to ask for delay, or is delay always 0. (Would this create a RS latch metastable effect? check)
    • Current restart is implemented by manually writing 0s. Confirm whether this works, and necessity to use designated pins for global control.
    • (Potential) Support configuration of different delays from UI.

July 20

  • Added define statement for LUT (PCA programmable address)
  • TODO: Add PCA_full_ON (100%) case

July 21

  • Added FULL on case and verified with proxy

July 22

  • Started Doxygen comment in PCA9685.h

Aug 11

  • Completed PCA9685 comments
  • Added read from file for address table.
  • TODO
    • Documentation for io
    • Parametrize file names