ports/stm32/boards/NUCLEO_L476RG/mpconfigboard: expose 5 remaining UA…

[aziubin]

STM32L476RG mcu of NUCLEO_L476RG board has 6 UART units in total (USART1, USART2, USART3, UART4, UART5 and LPUART1), but only UART2, which is connected to REPL, has been defined and available for Python code. As a result there is no possibility to use serial communication together with REPL.

This pull request resolves the issue with missing UART units in NUCLEO_L476RG board official MicroPython firmware, which affects others, for example:

• Can not initialize STM32L476 UART
• UART(4) doesn´t exist (STM32L476 Nucleo)
• NUCLEO-L476RG firmware has only UART2 defined

Tested on real NUCLEO_L476RG board:

MicroPython v1.14-120-g42cf77f48-dirty on 2021-03-20; NUCLEO-L476RG with STM32L476RG
Type "help()" for more information.
>>> print(pyb.UART(3, 9600).write(b'\xff\x01\x86\x00\x00\x00\x00\x00\x79'))
9
>>> print(pyb.UART(1, 9600).write(b'\xff\x01\x86\x00\x00\x00\x00\x00\x79'))
9
>>> print(pyb.UART(4, 9600).write(b'\xff\x01\x86\x00\x00\x00\x00\x00\x79'))
9
>>> print(pyb.UART(5, 9600).write(b'\xff\x01\x86\x00\x00\x00\x00\x00\x79'))
9
>>> print(pyb.UART('LP1',0).write(b'\xff\x01\x86\x00\x00\x00\x00\x00\x79'))
9
>>> print(pyb.UART(6, 0).write(b'\xff\x01\x86\x00\x00\x00\x00\x00\x79'))
9
>>> 

Tested in real scenario using MH-Z19C CO2 sensor with UART interface:

MPY: sync filesystems
MPY: soft reboot
78.723  co2         = 500.00
79.735  co2         = 500.00
80.747  co2         = 500.00
81.759  co2         = 500.00
82.77101  co2         = 500.00
83.784  co2         = 500.00
84.796  co2         = 500.00
85.808  co2         = 500.00
86.82  co2         = 500.00
87.832  co2         = 500.00
88.844  co2         = 500.00

References:

• STM32L476xx Datasheet
• UM1724 STM32 Nucleo-64 boards (MB1136) User manual

Signed-off-by: Alexander Ziubin aziubin@googlemail.com

[aziubin]

Commot message does not follow convention.

[davehylands]

You can update your commit message by using: git commit --amend and then you don't need to create a new PR

[aziubin]

Thank you, @davehylands, I have another issue - Check commit message formatting reports "error: commit 8b98099: Unwanted email address: noreply@github.com", although I have updated my email settings in GitHub and I can see now with git log -1 that my commit message does not contain noreply@github.com.

[davehylands]

Sorry - I'm not sure what the issue might be there. Now that your email is setup properly, you might need to create a new branch and cherry pick that commit. I fetched the commit you referenced and it seems to have the correct email.

github.com says "This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository."