Description

Liquid Crystal Display (LCD) Peripheral API.

This module contains functions to control the LDC peripheral of Silicon Labs 32-bit MCUs and SoCs. The LCD driver can drive up to 8x36 segmented LCD directly. The animation feature makes it possible to have active animations without the CPU intervention.

Data Structures
struct	LCD_AnimInit_TypeDef
	LCD Animation Configuration.

struct	LCD_FrameCountInit_TypeDef
	LCD Frame Control Initialization.

struct	LCD_Init_TypeDef
	LCD Controller Initialization structure.

Functions
void	LCD_Init (const LCD_Init_TypeDef *lcdInit)
	Initialize the Liquid Crystal Display (LCD) controller.

void	LCD_UpdateCtrl ( LCD_UpdateCtrl_TypeDef ud)
	Configure Update Control.

void	LCD_FrameCountInit (const LCD_FrameCountInit_TypeDef *fcInit)
	Initialize the LCD Frame Counter.

void	LCD_AnimInit (const LCD_AnimInit_TypeDef *animInit)
	Configure the LCD controller Animation feature.

void	LCD_SegmentSet (int com, int bit, bool enable)
	Turn on or clear a segment.

void	LCD_SegmentSetLow (int com, uint32_t mask, uint32_t bits)
	Update 0-31 lowest segments on a given COM-line in one operation according to the bit mask.

void	LCD_SegmentSetHigh (int com, uint32_t mask, uint32_t bits)
	Update the high (32-39) segments on a given COM-line in one operation.

void	LCD_ContrastSet (int level)
	Configure the contrast level on the LCD panel.

void	LCD_BiasSet ( LCD_Bias_TypeDef bias)
	Configure the bias level on the LCD panel.

void	LCD_BiasSegmentSet (int segmentLine, int biasLevel)
	Configure the bias level for a specific segment line for Direct Segment Control.

void	LCD_BiasComSet (int comLine, int biasLevel)
	Configure the bias level for a specific segment line.

void	LCD_ModeSet ( LCD_Mode_Typedef mode)
	Configure the mode for the LCD panel.

void	LCD_ChargeRedistributionCyclesSet (uint8_t cycles)
	Configure the charge redistribution cycles for the LCD panel.

void	LCD_Enable (bool enable)
	Enable or disable LCD controller.

void	LCD_AnimEnable (bool enable)
	Enables or disables LCD Animation feature.

void	LCD_BlinkEnable (bool enable)
	Enables or disables LCD blink.

void	LCD_BlankEnable (bool enable)
	Disables all segments, while keeping segment state.

void	LCD_FrameCountEnable (bool enable)
	Enables or disables LCD Frame counter.

int	LCD_AnimState (void)
	Returns current animation state.

int	LCD_BlinkState (void)
	Returns current blink state.

void	LCD_FreezeEnable (bool enable)
	When set, LCD registers will not be updated until cleared.

uint32_t	LCD_SyncBusyGet (void)
	Returns SYNCBUSY bits, indicating which registers have pending updates.

void	LCD_SyncBusyDelay (uint32_t flags)
	Polls LCD SYNCBUSY flags, until flag has been cleared.

uint32_t	LCD_IntGet (void)
	Get pending LCD interrupt flags.

uint32_t	LCD_IntGetEnabled (void)
	Get enabled and pending LCD interrupt flags.

void	LCD_IntSet (uint32_t flags)
	Set one or more pending LCD interrupts from SW.

void	LCD_IntEnable (uint32_t flags)
	Enable LCD interrupts.

void	LCD_IntDisable (uint32_t flags)
	Disable LCD interrupts.

void	LCD_IntClear (uint32_t flags)
	Clear one or more interrupt flags.

void	LCD_DSCEnable (bool enable)
	Enable or disable LCD Direct Segment Control.

Macros
#define	LCD_DEFAULT_CLOCK_PRESCALER 64
	Default Clock Prescaler.

#define	LCD_DEFAULT_FRAME_RATE_DIV 4
	Default LCD Frame Rate Divisor.

#define	LCD_DEFAULT_CONTRAST 15
	Default LCD Contrast.

#define	LCD_INIT_DEFAULT
	Default configuration for LCD initialization structure, enables 160 segments.

#define	LCD_FRAME_COUNTER_VAL_MAX 64
	Frame counter uses a maximum of 5 bits (FCTOP[5:0]).

Enumerations
enum	LCD_Mux_TypeDef { lcdMuxStatic = LCD_DISPCTRL_MUX_STATIC, lcdMuxDuplex = LCD_DISPCTRL_MUX_DUPLEX, lcdMuxTriplex = LCD_DISPCTRL_MUX_TRIPLEX, lcdMuxQuadruplex = LCD_DISPCTRL_MUX_QUADRUPLEX, lcdMuxSextaplex = LCD_DISPCTRL_MUX_SEXTAPLEX, lcdMuxOctaplex = LCD_DISPCTRL_MUX_OCTAPLEX }
	MUX setting.

enum	LCD_Wave_TypeDef { lcdWaveLowPower = LCD_DISPCTRL_WAVE_LOWPOWER, lcdWaveNormal = LCD_DISPCTRL_WAVE_NORMAL }
	Wave type.

enum	LCD_Bias_TypeDef { lcdBiasStatic = LCD_DISPCTRL_BIAS_STATIC, lcdBiasOneHalf = LCD_DISPCTRL_BIAS_ONEHALF, lcdBiasOneThird = LCD_DISPCTRL_BIAS_ONETHIRD, lcdBiasOneFourth = LCD_DISPCTRL_BIAS_ONEFOURTH }
	Bias setting.

enum	LCD_Mode_Typedef { lcdModeNoExtCap = LCD_DISPCTRL_MODE_NOEXTCAP, lcdModeStepDown = LCD_DISPCTRL_MODE_STEPDOWN, lcdModeCpIntOsc = LCD_DISPCTRL_MODE_CPINTOSC }
	Contrast Configuration.

enum	LCD_FCPreScale_TypeDef { lcdFCPrescDiv1 = LCD_BACTRL_FCPRESC_DIV1, lcdFCPrescDiv2 = LCD_BACTRL_FCPRESC_DIV2, lcdFCPrescDiv4 = LCD_BACTRL_FCPRESC_DIV4, lcdFCPrescDiv8 = LCD_BACTRL_FCPRESC_DIV8 }
	Frame Counter Clock Prescaler, FC-CLK = FrameRate (Hz) / this factor.

enum	LCD_UpdateCtrl_TypeDef { lcdUpdateCtrlRegular = LCD_CTRL_UDCTRL_REGULAR, lcdUpdateCtrlFCEvent = LCD_CTRL_UDCTRL_FCEVENT, lcdUpdateCtrlFrameStart = LCD_CTRL_UDCTRL_FRAMESTART }
	Update Data Control.

enum	LCD_AnimShift_TypeDef { lcdAnimShiftNone = _LCD_BACTRL_AREGASC_NOSHIFT, lcdAnimShiftLeft = _LCD_BACTRL_AREGASC_SHIFTLEFT, lcdAnimShiftRight = _LCD_BACTRL_AREGASC_SHIFTRIGHT }
	Animation Shift operation; none, left or right.

enum	LCD_AnimLogic_TypeDef { lcdAnimLogicAnd = LCD_BACTRL_ALOGSEL_AND, lcdAnimLogicOr = LCD_BACTRL_ALOGSEL_OR }
	Animation Logic Control, how AReg and BReg should be combined.

enum	LCD_AnimLoc_TypeDef { lcdAnimLocSeg0To7 = LCD_BACTRL_ALOC_SEG0TO7, lcdAnimLocSeg8To15 = LCD_BACTRL_ALOC_SEG8TO15 }
	Animation Location, set the LCD segments which animation applies to.

enum	LCD_ChargeRedistribution_TypeDef { lcdChargeRedistributionDisable = LCD_DISPCTRL_CHGRDST_DISABLE, lcdChargeRedistributionEnable = LCD_DISPCTRL_CHGRDST_ONE, lcdChargeRedistributionTwoCycle = LCD_DISPCTRL_CHGRDST_TWO, lcdChargeRedistributionThreeCycle = LCD_DISPCTRL_CHGRDST_THREE, lcdChargeRedistributionFourCycle = LCD_DISPCTRL_CHGRDST_FOUR }
	Charge redistribution control.

Function Documentation

◆ LCD_Init()

void LCD_Init ( const LCD_Init_TypeDef * lcdInit )

Initialize the Liquid Crystal Display (LCD) controller.

Configures the LCD controller. You must enable it afterwards, potentially configuring Frame Control and interrupts first according to requirements.

Parameters

[in] lcdInit A pointer to the initialization structure which configures the LCD controller.

◆ LCD_UpdateCtrl()

void LCD_UpdateCtrl ( LCD_UpdateCtrl_TypeDef ud )

Configure Update Control.

Parameters

[in] ud Configures the LCD update method.

◆ LCD_FrameCountInit()

void LCD_FrameCountInit ( const LCD_FrameCountInit_TypeDef * fcInit )

Initialize the LCD Frame Counter.

Parameters

[in] fcInit A pointer to the Frame Counter initialization structure.

◆ LCD_AnimInit()

void LCD_AnimInit ( const LCD_AnimInit_TypeDef * animInit )

Configure the LCD controller Animation feature.

Parameters

[in] animInit A pointer to the LCD Animation initialization structure.

◆ LCD_SegmentSet()

void LCD_SegmentSet	(	int	`com,`
		int	`bit,`
		bool	`enable`
	)

Turn on or clear a segment.

Note: For the Gecko Family, the maximum configuration is (COM-lines x Segment-Lines) 4x40. For the Tiny Gecko Family, the maximum configuration is 8x20 or 4x24. For the Giant Gecko Family, the maximum configuration is 8x36 or 4x40.

Parameters

[in]	`com`	A COM line to change.
[in]	`bit`	A bit index indicating which field to change.
[in]	`enable`	True will set segment, false will clear segment.

◆ LCD_SegmentSetLow()

void LCD_SegmentSetLow	(	int	`com,`
		uint32_t	`mask,`
		uint32_t	`bits`
	)

Update 0-31 lowest segments on a given COM-line in one operation according to the bit mask.

Parameters

[in]	`com`	Indicates a COM line to update.
[in]	`mask`	A bit mask for segments 0-31.
[in]	`bits`	A bit pattern for segments 0-31.

◆ LCD_SegmentSetHigh()

void LCD_SegmentSetHigh	(	int	`com,`
		uint32_t	`mask,`
		uint32_t	`bits`
	)

Update the high (32-39) segments on a given COM-line in one operation.

Parameters

[in]	`com`	Indicates a COM line to update.
[in]	`mask`	A bit mask for segments 32-39.
[in]	`bits`	A bit pattern for segments 32-39.

◆ LCD_ContrastSet()

void LCD_ContrastSet ( int level )

Configure the contrast level on the LCD panel.

Parameters

[in] level The contrast level in range 0-63.

◆ LCD_BiasSet()

void LCD_BiasSet ( LCD_Bias_TypeDef bias )

Configure the bias level on the LCD panel.

Parameters

[in] bias The bias level.

◆ LCD_BiasSegmentSet()

void LCD_BiasSegmentSet	(	int	`segmentLine,`
		int	`biasLevel`
	)

Configure the bias level for a specific segment line for Direct Segment Control.

Note: When DSC is active, each configuration takes up 4 bits in the corresponding Segment Registers (SEGD0L/SEGD1H for Series 0 and 1, SEGDx for Series 2) which defines the bias level. For optimal use of this feature, the entire SEGD-registers should be set at once in an optimized routine. Therefore, this function shows how to correctly configure the bias levels and should be used with care.

Parameters

[in]	`segmentLine`	A segment line number.
[in]	`biasLevel`	The bias configuration level. This value must be within the constraints defined by the LCD_DISPCTRL bias settings. For more information, see the applicable Reference Manual and data sheet.

◆ LCD_BiasComSet()

void LCD_BiasComSet	(	int	`comLine,`
		int	`biasLevel`
	)

Configure the bias level for a specific segment line.

Note: When DSC is active, each configuration takes up 4 bits in the corresponding Segment Registers (SEGD4L/SEGD4H for Series 0 and 1, AREGA/AREGB for Series 2) which defines bias level. For optimal use of this feature, the entire register set should be set at once in a optimized routine. Therefore, this function shows how to correctly configure the bias levels and should be used with care.

Parameters

[in]	`comLine`	A COM line number, between 0 and 7 for Series 0 and 1. For Series 2, max is LCD_COM_NUM, defined in device-specific headers.
[in]	`biasLevel`	The bias configuration level. This value must be within the constraints defined by the LCD_DISPCTRL bias settings. For more information, see the appropriate Reference Manual and data sheet.

◆ LCD_ModeSet()

void LCD_ModeSet ( LCD_Mode_Typedef mode )

Configure the mode for the LCD panel.

Parameters

[in] mode A mode.

int LCD_AnimState ( void )

inline

Returns current animation state.

Returns: Animation state, in range 0-15.

◆ LCD_BlinkState()

int LCD_BlinkState ( void )

inline

Returns current blink state.

Returns: Return value is 1 if segments are enabled, 0 if disabled.

◆ LCD_FreezeEnable()

void LCD_FreezeEnable ( bool enable )

inline

When set, LCD registers will not be updated until cleared.

Parameters

[in] enable When enable is true, update is stopped; when false, all registers are updated.

◆ LCD_SyncBusyGet()

uint32_t LCD_SyncBusyGet ( void )

inline

Returns SYNCBUSY bits, indicating which registers have pending updates.

Returns: Bit fields for LCD registers that have pending updates.

◆ LCD_SyncBusyDelay()

void LCD_SyncBusyDelay ( uint32_t flags )

inline

Polls LCD SYNCBUSY flags, until flag has been cleared.

Parameters

[in] flags Bit fields for LCD registers that will be updated before we continue.

◆ LCD_IntGet()

uint32_t LCD_IntGet ( void )

inline

Get pending LCD interrupt flags.

Returns: Pending LCD interrupt sources. Returns a set of interrupt flags OR-ed together for multiple interrupt sources in the LCD module (LCD_IFS_nnn).

◆ LCD_IntGetEnabled()

uint32_t LCD_IntGetEnabled ( void )

inline

Get enabled and pending LCD interrupt flags.

Useful for handling more interrupt sources in the same interrupt handler.

Note: Event bits are not cleared by the use of this function.

Returns

Pending and enabled LCD interrupt sources. Return value is the bitwise AND combination of

the OR combination of enabled interrupt sources in LCD_IEN_nnn register (LCD_IEN_nnn) and
the bitwise OR combination of valid interrupt flags of LCD module (LCD_IF_nnn).

◆ LCD_IntSet()

void LCD_IntSet ( uint32_t flags )

inline

Set one or more pending LCD interrupts from SW.

Parameters

[in] flags LCD interrupt sources to set to pending. Use a set of interrupt flags OR-ed together to set multiple interrupt sources for the LCD module (LCD_IFS_nnn).

◆ LCD_IntEnable()

void LCD_IntEnable ( uint32_t flags )

inline

Enable LCD interrupts.

Parameters

[in] flags LCD interrupt sources to enable. Use a set of interrupt flags OR-ed together to set multiple interrupt sources for LCD module (LCD_IFS_nnn).

◆ LCD_IntDisable()

void LCD_IntDisable ( uint32_t flags )

inline

Disable LCD interrupts.

Parameters

[in] flags LCD interrupt sources to disable. Use a set of interrupt flags OR-ed together to disable multiple interrupt sources for LCD module (LCD_IFS_nnn).

◆ LCD_IntClear()

void LCD_IntClear ( uint32_t flags )

inline

Clear one or more interrupt flags.

Parameters

[in] flags LCD interrupt sources to clear. Use a set of interrupt flags OR-ed together to clear multiple interrupt sources for LCD module (LCD_IFS_nnn).

◆ LCD_DSCEnable()

void LCD_DSCEnable ( bool enable )

inline

Enable or disable LCD Direct Segment Control.

Parameters

[in] enable If true, enables LCD controller Direct Segment Control Segment and COM line bias levels need to be set explicitly with LCD_BiasSegmentSet() and LCD_BiasComSet() function calls respectively.

Macro Definition Documentation

◆ LCD_DEFAULT_CLOCK_PRESCALER

#define LCD_DEFAULT_CLOCK_PRESCALER 64

Default Clock Prescaler.

◆ LCD_DEFAULT_FRAME_RATE_DIV

#define LCD_DEFAULT_FRAME_RATE_DIV 4

Default LCD Frame Rate Divisor.

◆ LCD_DEFAULT_CONTRAST

#define LCD_DEFAULT_CONTRAST 15

Default LCD Contrast.

◆ LCD_INIT_DEFAULT

#define LCD_INIT_DEFAULT

Value:

         {                                \
        
         true,                          \
        
         lcdMuxOctaplex,                \
        
         lcdBiasOneFourth,              \
        
         lcdWaveLowPower,               \
        
         lcdModeNoExtCap,               \
        
         lcdChargeRedistributionEnable, \
        
         LCD_DEFAULT_FRAME_RATE_DIV,    \
        
         LCD_DEFAULT_CONTRAST           \
        
         }

Default configuration for LCD initialization structure, enables 160 segments.

◆ LCD_FRAME_COUNTER_VAL_MAX

#define LCD_FRAME_COUNTER_VAL_MAX 64

Frame counter uses a maximum of 5 bits (FCTOP[5:0]).

Enumeration Type Documentation

◆ LCD_Mux_TypeDef

enum LCD_Mux_TypeDef

MUX setting.

Enumerator
lcdMuxStatic	Static (segments can be multiplexed with LCD_COM[0]).
lcdMuxDuplex	Duplex / 1/2 Duty cycle (segments can be multiplexed with LCD_COM[0:1]).
lcdMuxTriplex	Triplex / 1/3 Duty cycle (segments can be multiplexed with LCD_COM[0:2]).
lcdMuxQuadruplex	Quadruplex / 1/4 Duty cycle (segments can be multiplexed with LCD_COM[0:3]).
lcdMuxSextaplex	Sextaplex / 1/6 Duty cycle (segments can be multiplexed with LCD_COM[0:5]).
lcdMuxOctaplex	Octaplex / 1/6 Duty cycle (segments can be multiplexed with LCD_COM[0:5]).

◆ LCD_Wave_TypeDef

enum LCD_Wave_TypeDef

Wave type.

Enumerator
lcdWaveLowPower	Low power optimized waveform output.
lcdWaveNormal	Regular waveform output.

◆ LCD_Bias_TypeDef

enum LCD_Bias_TypeDef

Bias setting.

Enumerator
lcdBiasStatic	Static (2 levels).
lcdBiasOneHalf	1/2 Bias (3 levels).
lcdBiasOneThird	1/3 Bias (4 levels).
lcdBiasOneFourth	1/4 Bias (5 levels).

◆ LCD_Mode_Typedef

enum LCD_Mode_Typedef

Contrast Configuration.

Mode of operation.

Enumerator
lcdModeNoExtCap	No external capacitor.
lcdModeStepDown	External cap with resistor string.
lcdModeCpIntOsc	External cap and internal oscillator.

◆ LCD_FCPreScale_TypeDef

enum LCD_FCPreScale_TypeDef

Frame Counter Clock Prescaler, FC-CLK = FrameRate (Hz) / this factor.

Enumerator
lcdFCPrescDiv1	Prescale Div 1.
lcdFCPrescDiv2	Prescale Div 2.
lcdFCPrescDiv4	Prescale Div 4.
lcdFCPrescDiv8	Prescale Div 8.

◆ LCD_UpdateCtrl_TypeDef

enum LCD_UpdateCtrl_TypeDef

Update Data Control.

Enumerator

lcdUpdateCtrlRegular

Regular update, data transfer done immediately.

lcdUpdateCtrlFCEvent

Data transfer done at Frame Counter event.

lcdUpdateCtrlFrameStart

Data transfer done at Frame Start.

◆ LCD_AnimShift_TypeDef

enum LCD_AnimShift_TypeDef

Animation Shift operation; none, left or right.

Enumerator
lcdAnimShiftNone	No shift.
lcdAnimShiftLeft	Shift segment bits left.
lcdAnimShiftRight	Shift segment bits right.

◆ LCD_AnimLogic_TypeDef

enum LCD_AnimLogic_TypeDef

Animation Logic Control, how AReg and BReg should be combined.

Enumerator

lcdAnimLogicAnd

Use bitwise logic AND to mix animation register A (AREGA) and B (AREGB).

lcdAnimLogicOr

Use bitwise logic OR to mix animation register A (AREGA) and B (AREGB).

◆ LCD_AnimLoc_TypeDef

enum LCD_AnimLoc_TypeDef

Animation Location, set the LCD segments which animation applies to.

Enumerator

lcdAnimLocSeg0To7

Animation appears on segments 0 to 7.

lcdAnimLocSeg8To15

Animation appears on segments 8 to 15.

◆ LCD_ChargeRedistribution_TypeDef

enum LCD_ChargeRedistribution_TypeDef

Charge redistribution control.

Enumerator
lcdChargeRedistributionDisable	Disable charge redistribution.
lcdChargeRedistributionEnable	Use 1 prescaled low frequency clock cycle for charge redistribution.
lcdChargeRedistributionTwoCycle	Use 2 prescaled low frequency clock cycle for charge redistribution.
lcdChargeRedistributionThreeCycle	Use 3 prescaled low frequency clock cycle for charge redistribution.
lcdChargeRedistributionFourCycle	Use 4 prescaled low frequency clock cycle for charge redistribution.

LCD - Liquid Crystal Display

Description

Data Structures

Functions

Macros

Enumerations

Function Documentation

◆ LCD_Init()

◆ LCD_UpdateCtrl()

◆ LCD_FrameCountInit()

◆ LCD_AnimInit()

◆ LCD_SegmentSet()

◆ LCD_SegmentSetLow()

◆ LCD_SegmentSetHigh()

◆ LCD_ContrastSet()

◆ LCD_BiasSet()

◆ LCD_BiasSegmentSet()

◆ LCD_BiasComSet()

◆ LCD_ModeSet()

◆ LCD_ChargeRedistributionCyclesSet()

◆ LCD_Enable()

◆ LCD_AnimEnable()

◆ LCD_BlinkEnable()

◆ LCD_BlankEnable()

◆ LCD_FrameCountEnable()

◆ LCD_AnimState()

◆ LCD_BlinkState()

◆ LCD_FreezeEnable()

◆ LCD_SyncBusyGet()

◆ LCD_SyncBusyDelay()

◆ LCD_IntGet()

◆ LCD_IntGetEnabled()

◆ LCD_IntSet()

◆ LCD_IntEnable()

◆ LCD_IntDisable()

◆ LCD_IntClear()

◆ LCD_DSCEnable()

Macro Definition Documentation

◆ LCD_DEFAULT_CLOCK_PRESCALER

◆ LCD_DEFAULT_FRAME_RATE_DIV

◆ LCD_DEFAULT_CONTRAST

◆ LCD_INIT_DEFAULT

◆ LCD_FRAME_COUNTER_VAL_MAX

Enumeration Type Documentation

◆ LCD_Mux_TypeDef

◆ LCD_Wave_TypeDef

◆ LCD_Bias_TypeDef

◆ LCD_Mode_Typedef

◆ LCD_FCPreScale_TypeDef

◆ LCD_UpdateCtrl_TypeDef

◆ LCD_AnimShift_TypeDef

◆ LCD_AnimLogic_TypeDef

◆ LCD_AnimLoc_TypeDef

◆ LCD_ChargeRedistribution_TypeDef