Public Member Functions
	MY9221 (uint8_t dataPin, uint8_t clockPin, int instances=1)

	~MY9221 ()

void	setAutoRefresh (bool enable)

void	setLED (int led, bool on)

void	setLowIntensityValue (int intensity)

void	setHighIntensityValue (int intensity)

void	setAll ()

void	clearAll ()

void	refresh ()

Static Public Attributes
static const int	LEDS_PER_INSTANCE = 12

Protected Member Functions
virtual void	lockData ()

virtual void	send16bitBlock (uint16_t data)

Protected Attributes
bool	m_autoRefresh

uint16_t	m_lowIntensity

uint16_t	m_highIntensity

unsigned int	m_instances

uint16_t *	m_bitStates

uint16_t	m_commandWord

mraa::Gpio	m_gpioClk

mraa::Gpio	m_gpioData

Constructor & Destructor Documentation

MY9221	(	uint8_t	dataPin,
		uint8_t	clockPin,
		int	instances = `1`
	)

Instantiates an MY9221 object

Parameters

dataPin	Data pin
clockPin	Clock pin
instances	Number of daisy-chained my9221s, default 1

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~MY9221 ( )

MY9221 destructor

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Member Function Documentation

void setAutoRefresh ( bool enable )

inline

Enable or disable auto refresh. When auto refresh is enabled, update the LED display as soon as the internal state changes. When false, the display(s) will not be updated until the refresh() method is called.

Parameters

enable true to enable auto refresh, false otherwise

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void setLED	(	int	led,
		bool	on
	)

Set an LED to a specific on (high intensity) or off (low intensity) value.

Parameters

led	The LED whose state you wish to change
on	true to turn on the LED, false to turn the LED off

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void setLowIntensityValue ( int intensity )

Set the greyscale intensity of an LED in the OFF state. The intensity is a value from 0 (fully off) to 255 (fully on). This will take effect on any future LED set or clear operations.

Parameters

intensity a value from 0 (fully off) to 255 (fully on)

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void setHighIntensityValue ( int intensity )

Set the greyscale intensity of an LED in the ON state. The intensity is a value from 0 (fully off) to 255 (fully on). This will take effect on any future LED set or clear operations.

Parameters

intensity a value from 0 (fully off) to 255 (fully on)

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