ad799x-spin

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This is a P8X32A/Propeller, P2X8C4M64P/Propeller 2 driver object for Analog Devices AD799x-series ADCs.

IMPORTANT: This software is meant to be used with the spin-standard-library (P8X32A) or p2-spin-standard-library (P2X8C4M64P). Please install the applicable library first before attempting to use this code, otherwise you will be missing several files required to build the project.

Salient Features

• I2C connection at up to 400kHz (maximum is not enforced)
• Read ADC word or voltage in micro-volts
• Set active channel mask
• Set function of BUSY/ALERT pin
• Set ADC data rate (currently interval between measurements)

Requirements

P1/SPIN1:

• spin-standard-library
• signal.adc_common.spinh (provided by spin-standard-library)

P2/SPIN2:

• p2-spin-standard-library
• signal.adc_common.spin2h (provided by p2-spin-standard-library) (NOTE: untested on P2)

Compiler Compatibility

Processor	Language	Compiler	Backend	Status
P1	SPIN1	FlexSpin (6.2.1)	Bytecode	OK
P1	SPIN1	FlexSpin (6.2.1)	Native/PASM	OK
P2	SPIN2	FlexSpin (6.2.1)	NuCode	FTBFS
P2	SPIN2	FlexSpin (6.2.1)	Native/PASM2	Build OK

(other versions or toolchains not listed are not supported, and may or may not work)

Hardware compatibility

• Supports AD7993, AD7994, AD7997, AD7998
• Tested with AD7993-1 (Parallax Propeller Board of Education)
• Untested with P2

Limitations

• Very early in development - may malfunction, or outright fail to build
• Channels other than first aren't fully implemented yet
• SCL/SDA on-chip filtering not yet implemented
• BUSY/ALERT active state not yet implemented
• Interrupts not yet implemented
• I2C high-speed mode not yet implemented