Add busio support for ADI MAX32xxx port

[Brandon-Hurst]

Add BUSIO Support for supported MAX32xxx devices. Not all capable MAX32 devices are supported yet; more support for MAX32650/MAX32666/MAX78002 boards may be added in a future PR. This module was tested on a MAX32690 board, the AD-APARD32690-SL. I used a ADT7140 I2C and MAX31723 SPI temperature sensor, and also tested the UART via the debug port serial connection.

• BUSIO support added for MAX32 devices
• Peripherals enumerated in peripherals/max32690 for MAX32690 MCU, including helper functions for mapping a set of pins to the associated on-chip peripheral
• common-hal/busio contains the implementation of the BUSIO port functions

MAX31723 (SPI):

ADT7420 (I2C):

A simple echo test was done with UART as well with no issues:

from board import *
from busio import UART
 
# init uart with timeout of 10 seconds
uart = UART(P2_12, P2_11, baudrate=115200, timeout = 10.0)
 
# Write 'hello' to another serial port
uart.write('hello\n')
 
# Read 5 characters
uart.read(5)
 
# Read until newline
uart.readline()

[dhalbert]

Thanks for continuing to flesh this out. The changes here are stylistic, to match how we do error messages, etc. elsewhere.

[Brandon-Hurst]

Thanks for the comments, Dan! Helpful stuff. I have implemented the requested changes to the error reporting -- should be ready for another review now.