MCP3208 8 channel ADC Class. More...

#include <mcp3208.h>

Public Member Functions
void	Start (const int dataPin, const int clockPin, const int selectPin, const int mode=0xFF, const int dacAPin=-1, const int dacBPin=-1)
	Start the ADC driver in a new cog. More...

void	Stop (void)
	Stop the driver and free a cog. More...

int	In (const int Channel)
	Read a channel input. More...

int	Average (const int Channel, const int N)
	Sample a channel n times and average the results. More...

void	Out (const short aOutput, const short bOutput=-1)
	Output analog values (if enabled during Start) More...

Detailed Description

MCP3208 8 channel ADC Class.

When the MCP3208 is configured for 3.3v operation each bit represents 0.00080566406v.

The MCP3208 requires three connections to the Propeller: clock, chip select, and data (tie together Dout and Din).

This object optionally provides two DACs as well. To enable these you need to have one or two Propeller I/O pins available. Each DAC I/O pin needs to have a low pass RC filter. I reccommend R = 1k and C = 0.1uF. With this configuration you should avoid changing the DAC more than once a millisecond (the cut off frequency is 1591Hz).

This driver does continuous sampling in the background.

This object is based on MCP3208.spin v1.0 written by Chip Gracey. Thanks!

Member Function Documentation

int MCP3208::Average	(	const int	Channel,
		const int	N
	)

inline

Sample a channel n times and average the results.

This function is useful for reducing noisy readings.

Parameters

Channel	The channel [0..7] to read
N	The number of samples to average

Here is the call graph for this function:

int MCP3208::In ( const int Channel)

inline

Read a channel input.

Parameters

Channel The channel [0..7] to read

Returns: The ADC reading in the range [0..4096]

void MCP3208::Out	(	const short	aOutput,
		const short	bOutput = `-1`
	)

inline

Output analog values (if enabled during Start)

The range is 0 (ground) to 65535 (3.3v) for the output.

Parameters

aOutput	The output value for channel a
bOutput	The output value for channel b

void MCP3208::Start	(	const int	dataPin,
		const int	clockPin,
		const int	selectPin,
		const int	mode = `0xFF`,
		const int	dacAPin = `-1`,
		const int	dacBPin = `-1`
	)

inline

Start the ADC driver in a new cog.

Be sure to give the driver sufficient time to start up.

Parameters

dataPin	The data in and data out pins on the MCP3208
clockPin	The clock pin on the MCP3208
selectPin	The select pin on the MCP3208
mode	Channel enables in bits [0..7], differential mode enable in bits [8..15]. Most applications should set this to 0xFF
dacAPin	If desired, the pin number for a DAC (see discussion above)
dacBPin	If desired, the pin number for a DAC (see discussion above)

void MCP3208::Stop ( void )

inline

Stop the driver and free a cog.

The documentation for this class was generated from the following file:

mcp3208.h

Public Member Functions

Detailed Description

Member Function Documentation