ADC Implementation

[wallarug]

Please implement the ADC for CircuitPython SeeSaw.

Some of the below can be simplified to achieve required functionality.

seesaw/include/RegisterMap.h

#define SEESAW_ADC_BASE 0x09

	/****** STATUS *****/
	#define SEESAW_ADC_STATUS 0x00

	//this is asserted when this encorunters an error
	#define SEESAW_ADC_STATUS_ERROR_BITS 0x01
	
	//this is asserted when window monitor interrupt occurs
	#define SEESAW_ADC_STATUS_WINMON 0x02
	
	/****** INTENSET *****/
	//writing a 1 to any of the bits in this register enables the interrupt
	#define SEESAW_ADC_INTEN 0x02

	// if this bit is set to 1, assert interrupt when window monitor conditions are met
	#define SEESAW_ADC_INTEN_WINMON_BITS 0x01

	/****** INTENCLR *****/
	/* writing a 1 to any of these bits disables the interrupt.
	 * this automatically updates the inten register
	 */
	#define SEESAW_ADC_INTENCLR 0x03

	// writing a 1 disables the window monitor interrupt
	#define SEESAW_ADC_INTENCLR_WINMON_BITS 0x01
	
	/****** WINMODE *****/
	#define SEESAW_ADC_WINMODE 0x04
		
	/****** WINTHRESH *****/
	//window monitor thresholds
	#define SEESAW_ADC_WINTHRESH 0x05
	
	/****** CHANNELS *****/
	#define SEESAW_ADC_CHANNEL_0 0x07
	#define SEESAW_ADC_CHANNEL_1 0x08
	#define SEESAW_ADC_CHANNEL_2 0x09
	#define SEESAW_ADC_CHANNEL_3 0x0A
    #define SEESAW_ADC_CHANNEL_4 0x0B
    #define SEESAW_ADC_CHANNEL_5 0x0C
    #define SEESAW_ADC_CHANNEL_6 0x0D
    #define SEESAW_ADC_CHANNEL_7 0x0E

Documentation: https://learn.adafruit.com/adafruit-seesaw-atsamd09-breakout/analog-to-digital-converter

CircuitPython Learn Guide: https://learn.adafruit.com/circuitpython-essentials/circuitpython-analog-in