pyorcai2c 0.0.8

python wrapper for I2C communications with ORCASEMI devices through FTDI

PYORCAI2C

INSTALL

    pip install pyorcai2c

BASIC USAGE

    import pyorcai2c
    i2c = pyorcai2c.ftdi(b'SERIAL_NUMBER')

    res = i2c.write(slave=ANY_NUMBER, target=ANY_NUMBER, data=ANY_NUMBER)
    print(res)

    res = i2c.read(slave=ANY_NUMBER, target=ANY_NUMBER)
    print(res)

RETRIEVING FTDI BOARD SERIAL NUMBER

If you don't know the serial number of the FTDI board you are using do the following:

    import ftd2xx
    available_devices = ftd2xx.createDeviceInfoList()
    available_devices = ftd2xx.listDevices()

OTHER FEATURES

i2c.write always requires the slave argument as a integer positive number. No other arguments are mandatory.

    # ping slave
    res = i2c.write(slave=ANY_NUMBER)
    print(res)

    # i2c command
    res = i2c.write(slave=ANY_NUMBER, target=COMMAND_AS_A NUMBER)
    print(res)

target argument of i2c.write can eiher be a single integer or a dictionary in the form address_as_integer: data_as_integer. i2c.write will optimize i2c communication by performing the minimum required number of burst write needed to complete the request. If target argument of i2c.write is a number data argument is also needed. If target argument of i2c.write is an {int: int} dictionary the data argument will be ignored.

A burst read of n bytes can easely be performed through one of the following ways:

    # read burts by specifing start address and number of bytes
    res = i2c.read(slave=ANY_NUMBER, target=ANY_NUMBER, n=n)
    print(res)

    # read burst by specifing target as an array
    res = i2c.read(slave=ANY_NUMBER, target=[ANY_NUMBER_1, ANY_NUMBER_2, ANY_NUMBER_3])
    print(res)

target argument of i2c.read can eiher be a single integer or a list of integers. i2c.read will optimize i2c communication by performing the minimum required number of burst read needed to complete the request. If target argument of i2c.read is a number n argument is defaulted to 1 if absent. If target argument of i2c.read is a list of integers the n argument will be ignored.

I2C COMMUNICATIONS BASED ON REGISTER MAP USAGE

To import ORCA products register map do the following:

    import os
    cwd = os.getcwd()
    regmap_filepath = os.path.join(cwd, 'regmaps', 'xxx-register-map.json')
    regmap = i2c.load_register_map(regmap_filepath)

Loading a register map will allow for both register based and field based communication.

    res = i2c.write(slave=ANY_NUMBER, target=VALID_REGISTER_NAME, data=ANY_NUMBER)
    print(res)

    res = i2c.write(slave=ANY_NUMBER, target=VALID_FIELD_NAME, data=ANY_NUMBER)
    print(res)

    res = i2c.read(slave=ANY_NUMBER, target=VALID_REGISTER_NAME)
    print(res)

    res = i2c.read(slave=ANY_NUMBER, target=VALID_FIELD_NAME)
    print(res)

UPDATING VERION

    pip uninstall pyorcai2c
    pip install pyorcai2c

DRYRUN MODE

to write to a local dummy file instead of using a real USB connected FTDI interface fro I2C instantiate the communication object with optional argument dryrun_mode=True (default=False) or use method set_dryrun_mode(True\False, [filepath])

# using custom dummy memory path and location
# 1st option
i2c = ftdi(FTDI_SERIAL_NUMBER, dryrun_mode=True)
# 2nd option
i2c.set_dryrun_mode(True)

# specifying custom dummy memory file
custom_dummy_memory_path = os.path.join(dummy_memory_folder, 'test_dummy_memory.json')

# 1st option
i2c = ftdi(FTDI_SERIAL_NUMBER, dryrun_mode=True, dummy_part_memory=custom_dummy_memory_path)
# 2nd option
i2c.set_dryrun_mode(True, custom_dummy_memory_path)

ADVANCED USAGE:

All of the above ways of communications can be mixed up without much restraint and in a pretty natural way. Mixing up integers, register_names of field_names as the target arguments. The following strange calls will simply and just work. The module will take care of optimizing the I2C communications by minimizing it through as little burst commands as possible. The module response structure will reflect the request for the data part of the response while the acks part will be based on starting register address of the burst command.

    res = i2c.read(
        slave=slave, 
        target=[
            0x04, 
            0x02, 
            0x05, 
            0xA1, 
            0xA3, 
            0xA2, 
            0x06, 
            'ChargeCtrl1', 
            'ChargeCtrl2', 
            'LDO1Mode', 
            'LDO2Ctrl', 
            'LDO2Voltage', 
            'tst_bias_a',
            'TstCntrl7',
            'LDO1Voltage'
        ]
    )
    print(res)

    res = i2c.write(
        slave=slave, 
        target={
        0x02:0xAA,
        0x01:0xEA,
        0x10:0xCD,
        0x05:0xFE,
        0x06:0xBB,
        'LDO2Voltage':0x55,
        'Buck1Ctrl2':0x33,
        'unused_Buck1Ctrl2_b2':1,
        'unused_Buck1Ctrl2_b4':1,
        'unused_Buck1Ctrl2_b5':0,
        'Buck1Ton':255,
        'Buck1VRegA':0
        }
    )
    print(res)

additional code examples:

You can find additional examples here: https://github.com/orcasemi/pyorcai2c/blob/main/tests/test.py and here: https://github.com/orcasemi/pyorcai2c/blob/main/tests/debug.py

co-development (ORCA DEVELOPMENT TEAM ONLY)

1. clone the repository locally

    git clone [e-mail]:orcasemi/pyorcai2c.git

if you get an error about not having enough clearance to clone it please follow this tutorial to setup a github ssh-key and contact orcasemi github organization to be added as a member

2. setup and activate virtual envinroment

    cd pyorcai2c
    python -m venv

3. if you are on windows and you have never done that before you need to enable powershell to run scripts in order to activate the newly created virtual envinroment

    Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser

run that from an admin elevated powershell

4. activate the virtual envinroment

    .\venv\Scripts\activate 

5. run test

    pyhton .\test\test.py

6. publish on PyPI

py -m build
py -m twine upload --repository pypi  dist/*