Re: Simpler Question (Re: MCP2221 I2C/UART to USB)

On Thu, Nov 14, 2024 at 12:21 AM Tomek CEDRO <tomek@cedro.info> wrote:
> On Thu, Nov 14, 2024 at 12:08 AM George Mitchell <george+freebsd@m5p.com> wrote:
> > > Okay I just ordered the MCP2221A Breakout Stemma QT/Qwiic for ~10EUR
> > > it should arrive on Friday/Monday will see what happens ;-)
> > That just happens to be the board I was hoping to get!        -- George
> Cool I will let you know how it works :-)

This MCP2221A works like a charm out of the box on FreeBSD 13.3 :-)

Nov 16 02:08:30 octagon kernel: ugen0.6: <Microchip Technology Inc.
MCP2221 USB-I2C/UART Combo> at usbus0
Nov 16 02:08:30 octagon kernel: umodem0 on uhub21
Nov 16 02:08:30 octagon kernel: umodem0: <Microchip Technology Inc.
MCP2221 USB-I2C/UART Combo, class 239/2, rev 2.00/1.00, addr 5> on
usbus0
Nov 16 02:08:30 octagon kernel: umodem0: data interface 1, has no CM
over data, has no break
Nov 16 02:08:30 octagon kernel: usbhid5 on uhub21
Nov 16 02:08:30 octagon kernel: usbhid5: <Microchip Technology Inc.
MCP2221 USB-I2C/UART Combo, class 239/2, rev 2.00/1.00, addr 5> on
usbus0
Nov 16 02:08:30 octagon kernel: hidbus5: <HID bus> on usbhid5

Then /dev/cuaU0 shows up and I can connect to some board over UART:

nsh> uname -a
NuttX 12.7.0 5d8cdeaea8-dirty Nov 16 2024 02:02:28 arm nucleo-f4x1re

I used minicom to change baud and it seems to work. Note this chip
does not have control lines so you probably need to use GPIO to reset
/ select boot if necessary.

Regarding the additional stuff it seems to work in Python over hid but
I did not play any further (after cable disconnect I got errors on
commands so there is some communication).

(venv3.11embedded) python
Python 3.11.10 (main, Sep 14 2024, 01:19:37) [Clang 17.0.6
(https://github.com/llvm/llvm-project.git llvmorg-17.0.6-0-g600970 on
freebsd13
Type "help", "copyright", "credits" or "license" for more information.
>>> from PyMCP2221A import PyMCP2221A
>>> mcp2221 = PyMCP2221A.PyMCP2221A()
>>> mcp2221.GPIO_Init()
mcp2221.ADC_1_Init()         mcp2221.CLKDIV_2
mcp2221.CLKDUTY_25           mcp2221.DAC_2_Init()
mcp2221.GPIO_0_InputMode()   mcp2221.GPIO_1_Input()
mcp2221.GPIO_2_DIR           mcp2221.GPIO_3_BIT
mcp2221.GPIO_3_OutputMode()  mcp2221.I2C_Read(
mcp2221.Read_Flash_Data(
mcp2221.ADC_2_Init()         mcp2221.CLKDIV_32
mcp2221.CLKDUTY_50           mcp2221.DAC_Datawrite(
mcp2221.GPIO_0_MODE          mcp2221.GPIO_1_InputMode()
mcp2221.GPIO_2_Input()       mcp2221.GPIO_3_DIR
mcp2221.GPIO_Init()          mcp2221.I2C_Read_Repeated(
mcp2221.Reset()
mcp2221.ADC_3_Init()         mcp2221.CLKDIV_4
mcp2221.CLKDUTY_75           mcp2221.DeviceDriverInfo()
mcp2221.GPIO_0_Output(       mcp2221.GPIO_1_MODE
mcp2221.GPIO_2_InputMode()   mcp2221.GPIO_3_Input()
mcp2221.GPIO_Read()          mcp2221.I2C_State_Check()
mcp2221.Write_Flash_Data(
mcp2221.ADC_DataRead()       mcp2221.CLKDIV_64
mcp2221.ClockOut(            mcp2221.GPIO_0_BIT
mcp2221.GPIO_0_OutputMode()  mcp2221.GPIO_1_Output(
mcp2221.GPIO_2_MODE          mcp2221.GPIO_3_InputMode()
mcp2221.GPIO_Write()         mcp2221.I2C_Write(
mcp2221.mcp2221a
mcp2221.CLKDIV_128           mcp2221.CLKDIV_8
mcp2221.Command_Structure(   mcp2221.GPIO_0_DIR
mcp2221.GPIO_1_BIT           mcp2221.GPIO_1_OutputMode()
mcp2221.GPIO_2_Output(       mcp2221.GPIO_3_MODE
mcp2221.I2C_Cancel()         mcp2221.I2C_Write_No_Stop(
mcp2221.CLKDIV_16            mcp2221.CLKDUTY_0
mcp2221.DAC_1_Init()         mcp2221.GPIO_0_Input()
mcp2221.GPIO_1_DIR           mcp2221.GPIO_2_BIT
mcp2221.GPIO_2_OutputMode()  mcp2221.GPIO_3_Output(
mcp2221.I2C_Init(            mcp2221.I2C_Write_Repeated(

Regarding the rPI Zero 2W I dd'ed the 14.1 SD image for RPI and got
the rainbow box on hdmi but some updates are needed in the firmware
files on first partition, I quickly updated to git master but that did
not help, and I not rally have time now to play, but it was fun to try
:-)

Have fun George :-)

-- 
CeDeROM, SQ7MHZ, http://www.tomek.cedro.info