Core api update analog io

[LinjingZhang]

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Description

1. Add analogIO module
2. Update the arduino-core-test
3. Update the documentation

Related Issue
NA

Context
Test Results:
PWM Test

ADC Test

DAC Test

Docs Preview

[Copilot]

Pull Request Overview

This PR reintroduces and centralizes PWM channel mappings, adds full support for analog I/O (ADC and DAC) including read/write resolution, and updates core Arduino headers and tests to exercise the new analog API.

• Restored mapping_pin_PWM4, mapping_pwm4, mapping_pin_PWM8, mapping_pwm8, and related constants to drive PWM output.
• Implemented analogRead, analogWrite, and resolution APIs in wiring_analog.cpp and exposed prototypes in Arduino.h.
• Extended tests in tests/test_config.h to cover analog I/O parameters and added DAC test pin definitions.

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
variants/.../pins_arduino.h	Un-commented and made PWM and ADC/DAC pin mappings active
tests/test_config.h	Updated digital pin assignments and added analog test pins
cores/xmc/wiring_analog.cpp	New implementation of analogRead/write and resolution
cores/xmc/main.cpp	Removed redundant wiring_analog_init() call
cores/xmc/Arduino.h	Added DEFAULT, ENABLED, DISABLED macros and analog prototype declarations

Comments suppressed due to low confidence (1)

cores/xmc/wiring_analog.cpp:133

• Using 0b10 << _writeResolution yields 2^(resolution+1). To scale correctly by resolution bits, use (1U << _writeResolution) instead of 0b10.

uint16_t dacValue = map(value, 0, (0b10 << _writeResolution) - 1, 0, (0b10 << dac->resolution) - 1);

[Copilot]

[nitpick] The macro DEFAULT is very generic and may conflict with other code. Consider renaming it to something more specific like ANALOG_REF_DEFAULT.

Suggested change

	#define DEFAULT XMC_VADC_CHANNEL_REF_INTREF
	#define ANALOG_REF_DEFAULT XMC_VADC_CHANNEL_REF_INTREF

[LinjingZhang]

well, not easy to fix because of arduino standard and tests...

[Copilot]

pinNumber here is the Arduino pin index (e.g., A0 = 14), but it’s being used directly as an index into mapping_adc. You need a lookup (e.g., using scan_map_table) to map Arduino pin numbers to ADC channel entries.

[jaenrig-ifx]

This is no longer called anywhere?

[LinjingZhang]

This is called in analogRead(), since it only initialize ADC