ustd::Max72XX Class Reference

The MAX72XX Controller Class. More...

#include <max72xx.h>

Public Types
enum	OP {   noop = 0 , digit0 = 1 , digit1 = 2 , digit2 = 3 ,   digit3 = 4 , digit4 = 5 , digit5 = 6 , digit6 = 7 ,   digit7 = 8 , decodemode = 9 , intensity = 10 , scanlimit = 11 ,   shutdown = 12 , displaytest = 15 }

Public Member Functions
	Max72XX (uint8_t csPin, uint8_t chainLen)
void	begin ()
uint8_t	getChainLen () const
void	setDecodeMode (uint8_t mode)
void	setIntensity (uint8_t intensity)
void	setScanLimit (uint8_t scanlimit)
void	setPowerSave (bool powersave)
void	setTestMode (bool testmode)
void	sendCommand (OP opcode, uint8_t data)
void	sendBlock (uint8_t *buffer, uint8_t size)

Detailed Description

The MAX72XX Controller Class.

This class implements the communication interface to a maxim MAX7219 or MAX7221 Serially Interfaced, 8-Digit, LED Display Drivers See https://datasheets.maximintegrated.com/en/ds/MAX7219-MAX7221.pdf

Member Enumeration Documentation

OP

enum ustd::Max72XX::OP

The maxim 7219/7221 operation modes

Enumerator
noop	No operation.
digit0	Digit 0.
digit1	Digit 1.
digit2	Digit 2.
digit3	Digit 3.
digit4	Digit 4.
digit5	Digit 5.
digit6	Digit 6.
digit7	Digit 7.
decodemode	Decode Mode (0,1,15,255)
intensity	Intensity (0-15)
scanlimit	Scan-Limit (0-7)
shutdown	Shutdown Mode (0 or 1)
displaytest	Display Test (0 or 1)

Constructor & Destructor Documentation

Max72XX()

ustd::Max72XX::Max72XX ( uint8_t  csPin, uint8_t  chainLen  )

inline

Instantiate a Max72XX instance

Parameters

csPin	The chip select pin
chainLen	The length of the device chain

Member Function Documentation

begin()

void ustd::Max72XX::begin ( )

inline

Start the driver class

getChainLen()

uint8_t ustd::Max72XX::getChainLen ( ) const

inline

Get the number of devices in the chain

Returns

The number ofdevices in the chain

sendBlock()

void ustd::Max72XX::sendBlock ( uint8_t *  buffer, uint8_t  size  )

inline

Sends a block of data

Parameters

buffer	Buffer to send
size	Size in bytes of the buffer to send

sendCommand()

void ustd::Max72XX::sendCommand ( OP  opcode, uint8_t  data  )

inline

Sends a command to all devices

Parameters

opcode	Operation register
data	Operation parameter

setDecodeMode()

void ustd::Max72XX::setDecodeMode ( uint8_t  mode )

inline

Sets the BCD code B (0-9, E, H, L, P, and -) or no-decode operation for each digit

Parameters

mode	The bitmask specifying the decode mode for each digit.

setIntensity()

void ustd::Max72XX::setIntensity ( uint8_t  intensity )

inline

Set the brightness of all devices

Parameters

intensity

The brightness of the devices. (0..15)

setPowerSave()

void ustd::Max72XX::setPowerSave ( bool  powersave )

inline

Set the power saving mode for all devices

Parameters

powersave

If true the device goes into power-down mode. Set to false for normal operation.

setScanLimit()

void ustd::Max72XX::setScanLimit ( uint8_t  scanlimit )

inline

The scan-limit register sets how many digits are displayed, from 1 to 8

Parameters

scanLimit

Number of digits to show from 1 to 8

setTestMode()

void ustd::Max72XX::setTestMode ( bool  testmode )

inline

Set the test mode for all devices

In Test mode all leds are turned on in order to check for correct function.

Parameters

testmode

If true the devices goes into test mode. Set to false for normal operation.

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

• src/hardware/max72xx.h