Detailed 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

struct	LCD_FrameCountInit_TypeDef

struct	LCD_Init_TypeDef

Macros
#define	LCD_DEFAULT_CONTRAST 15

#define	LCD_DEFAULT_FRAME_RATE_DIV 4

#define	LCD_INIT_DEFAULT

Enumerations
enum	LCD_AnimLogic_TypeDef { lcdAnimLogicAnd = LCD_BACTRL_ALOGSEL_AND, lcdAnimLogicOr = LCD_BACTRL_ALOGSEL_OR }

enum	LCD_AnimShift_TypeDef { lcdAnimShiftNone = _LCD_BACTRL_AREGASC_NOSHIFT, lcdAnimShiftLeft = _LCD_BACTRL_AREGASC_SHIFTLEFT, lcdAnimShiftRight = _LCD_BACTRL_AREGASC_SHIFTRIGHT }

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

enum	LCD_ConConf_TypeDef { lcdConConfVLCD = LCD_DISPCTRL_CONCONF_VLCD, lcdConConfGND = LCD_DISPCTRL_CONCONF_GND }

enum	LCD_FCPreScale_TypeDef { lcdFCPrescDiv1 = LCD_BACTRL_FCPRESC_DIV1, lcdFCPrescDiv2 = LCD_BACTRL_FCPRESC_DIV2, lcdFCPrescDiv4 = LCD_BACTRL_FCPRESC_DIV4, lcdFCPrescDiv8 = LCD_BACTRL_FCPRESC_DIV8 }

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_MUXE_MUXE \| LCD_DISPCTRL_MUX_DUPLEX, lcdMuxOctaplex = LCD_DISPCTRL_MUXE_MUXE \| LCD_DISPCTRL_MUX_QUADRUPLEX }

enum	LCD_SegmentRange_TypeDef { lcdSegment0_3 = (1 << 0), lcdSegment4_7 = (1 << 1), lcdSegment8_11 = (1 << 2), lcdSegment12_15 = (1 << 3), lcdSegment16_19 = (1 << 4), lcdSegment20_23 = (1 << 5), lcdSegmentAll = (0x003f) }

enum	LCD_UpdateCtrl_TypeDef { lcdUpdateCtrlRegular = LCD_CTRL_UDCTRL_REGULAR, lcdUpdateCtrlFCEvent = LCD_CTRL_UDCTRL_FCEVENT, lcdUpdateCtrlFrameStart = LCD_CTRL_UDCTRL_FRAMESTART }

enum	LCD_VBoostLevel_TypeDef { lcdVBoostLevel0 = LCD_DISPCTRL_VBLEV_LEVEL0, lcdVBoostLevel1 = LCD_DISPCTRL_VBLEV_LEVEL1, lcdVBoostLevel2 = LCD_DISPCTRL_VBLEV_LEVEL2, lcdVBoostLevel3 = LCD_DISPCTRL_VBLEV_LEVEL3, lcdVBoostLevel4 = LCD_DISPCTRL_VBLEV_LEVEL4, lcdVBoostLevel5 = LCD_DISPCTRL_VBLEV_LEVEL5, lcdVBoostLevel6 = LCD_DISPCTRL_VBLEV_LEVEL6, lcdVBoostLevel7 = LCD_DISPCTRL_VBLEV_LEVEL7 }

enum	LCD_VLCDSel_TypeDef { lcdVLCDSelVDD = LCD_DISPCTRL_VLCDSEL_VDD, lcdVLCDSelVExtBoost = LCD_DISPCTRL_VLCDSEL_VEXTBOOST }

enum	LCD_Wave_TypeDef { lcdWaveLowPower = LCD_DISPCTRL_WAVE_LOWPOWER, lcdWaveNormal = LCD_DISPCTRL_WAVE_NORMAL }

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

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

__STATIC_INLINE int	LCD_AnimState (void)
	Returns current animation state.

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

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

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

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

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

__STATIC_INLINE int	LCD_BlinkState (void)
	Returns current blink state.

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

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

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

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

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

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

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

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

__STATIC_INLINE void	LCD_IntDisable (uint32_t flags)
	Disable LCD interrupts.

__STATIC_INLINE void	LCD_IntEnable (uint32_t flags)
	Enable LCD interrupts.

__STATIC_INLINE uint32_t	LCD_IntGet (void)
	Get pending LCD interrupt flags.

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

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

void	LCD_SegmentRangeEnable ( LCD_SegmentRange_TypeDef segmentRange, bool enable)
	Enables updating this range of LCD segment lines.

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.

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

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

void	LCD_UpdateCtrl ( LCD_UpdateCtrl_TypeDef ud)
	Configure Update Control.

void	LCD_VBoostSet ( LCD_VBoostLevel_TypeDef vboost)
	Configure voltage booster.

void	LCD_VLCDSelect ( LCD_VLCDSel_TypeDef vlcd)
	Select a source for VLCD.

Macro Definition Documentation

#define LCD_INIT_DEFAULT

Value:

         { \
        
         true, \
        
         lcdMuxQuadruplex, \
        
         lcdBiasOneThird, \
        
         lcdWaveLowPower, \
        
         lcdVLCDSelVDD, \
        
         lcdConConfVLCD, \
        
         }

Default configuration for LCD initialization structure, enables 160 segments.

Definition at line 299 of file em_lcd.h .

Enumeration Type Documentation

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).

Definition at line 221 of file em_lcd.h .

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.

Definition at line 211 of file em_lcd.h .

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).

Definition at line 99 of file em_lcd.h .

enum LCD_ConConf_TypeDef

Contrast Configuration.

Enumerator
lcdConConfVLCD	Contrast is adjusted relative to VDD (VLCD).
lcdConConfGND	Contrast is adjusted relative to Ground.

Definition at line 124 of file em_lcd.h .

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.

Definition at line 156 of file em_lcd.h .

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]).

Definition at line 68 of file em_lcd.h .

enum LCD_SegmentRange_TypeDef

Segment selection.

Enumerator
lcdSegment0_3	Select segment lines 0 to 3.
lcdSegment4_7	Select segment lines 4 to 7.
lcdSegment8_11	Select segment lines 8 to 11.
lcdSegment12_15	Select segment lines 12 to 15.
lcdSegment16_19	Select segment lines 16 to 19.
lcdSegment20_23	Select segment lines 20 to 23.
lcdSegmentAll	Select all segment lines.

Definition at line 169 of file em_lcd.h .

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.

Definition at line 201 of file em_lcd.h .

enum LCD_VBoostLevel_TypeDef

Voltage Boost Level - Data sheets document setting for each part number.

Enumerator
lcdVBoostLevel0	Voltage boost LEVEL0.
lcdVBoostLevel1	Voltage boost LEVEL1.
lcdVBoostLevel2	Voltage boost LEVEL2.
lcdVBoostLevel3	Voltage boost LEVEL3.
lcdVBoostLevel4	Voltage boost LEVEL4.
lcdVBoostLevel5	Voltage boost LEVEL5.
lcdVBoostLevel6	Voltage boost LEVEL6.
lcdVBoostLevel7	Voltage boost LEVEL7.

Definition at line 134 of file em_lcd.h .

enum LCD_VLCDSel_TypeDef

VLCD Voltage Source.

Enumerator
lcdVLCDSelVDD	VLCD Powered by VDD.
lcdVLCDSelVExtBoost	VLCD Powered by external VDD / Voltage Boost.

Definition at line 114 of file em_lcd.h .

enum LCD_Wave_TypeDef

Wave type.

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

Definition at line 91 of file em_lcd.h .

Function Documentation

__STATIC_INLINE void LCD_AnimEnable ( bool enable )

Enables or disables LCD Animation feature.

Parameters

[in] enable Boolean true enables animation, false disables animation.

Definition at line 383 of file em_lcd.h .

References LCD , and LCD_BACTRL_AEN .

Referenced by 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.

Definition at line 201 of file em_lcd.c .

References _LCD_BACTRL_ALOGSEL_MASK , _LCD_BACTRL_AREGASC_MASK , _LCD_BACTRL_AREGASC_SHIFT , _LCD_BACTRL_AREGBSC_MASK , _LCD_BACTRL_AREGBSC_SHIFT , LCD_AnimInit_TypeDef::animLogic , LCD_AnimInit_TypeDef::AReg , LCD_AnimInit_TypeDef::AShift , LCD_AnimInit_TypeDef::BReg , LCD_AnimInit_TypeDef::BShift , LCD_AnimInit_TypeDef::enable , LCD , and LCD_AnimEnable() .

__STATIC_INLINE int LCD_AnimState ( void )

Returns current animation state.

Returns: Animation state, in range 0-15.

Definition at line 447 of file em_lcd.h .

References _LCD_STATUS_ASTATE_MASK , _LCD_STATUS_ASTATE_SHIFT , and LCD .

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 Segment Registers (SEGD4L/SEGD4H) which defines bias level. For optimal use of this feature, the entire SEGD-registers 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, 0-7.
[in]	`biasLevel`	The bias configuration level, 0-4. 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.

Definition at line 764 of file em_lcd.c .

References LCD .

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 Segment Registers (SEGD0L/SEGD1H) 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, 0-4. 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.

Definition at line 660 of file em_lcd.c .

References LCD .

void LCD_BiasSet ( LCD_Bias_TypeDef bias )

Configure the bias level on the LCD panel.

Parameters

[in] bias The bias level.

Definition at line 617 of file em_lcd.c .

References _LCD_DISPCTRL_BIAS_MASK , and LCD .

__STATIC_INLINE void LCD_BlankEnable ( bool enable )

Disables all segments, while keeping segment state.

Parameters

[in] enable Boolean true clears all segments, boolean false restores all segment lines.

Definition at line 415 of file em_lcd.h .

References LCD , and LCD_BACTRL_BLANK .

__STATIC_INLINE void LCD_BlinkEnable ( bool enable )

Enables or disables LCD blink.

Parameters

[in] enable Boolean true enables blink, false disables blink.

Definition at line 399 of file em_lcd.h .

References LCD , and LCD_BACTRL_BLINKEN .

__STATIC_INLINE int LCD_BlinkState ( void )

Returns current blink state.

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

Definition at line 459 of file em_lcd.h .

References _LCD_STATUS_BLINK_MASK , _LCD_STATUS_BLINK_SHIFT , and LCD .

void LCD_ContrastSet ( int level )

Configure the contrast level on the LCD panel.

Parameters

[in] level The contrast level in range 0-31.

Definition at line 584 of file em_lcd.c .

References _LCD_DISPCTRL_CONLEV_MASK , _LCD_DISPCTRL_CONLEV_SHIFT , and LCD .

Referenced by LCD_Init() .

__STATIC_INLINE void LCD_DSCEnable ( bool enable )

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.

Definition at line 615 of file em_lcd.h .

References LCD , and LCD_CTRL_DSC .

__STATIC_INLINE void LCD_Enable ( bool enable )

Enable or disable LCD controller.

Parameters

[in] enable If true, enables LCD controller with current configuration. If false, disables LCD controller. Enable CMU clock for LCD for correct operation.

Definition at line 367 of file em_lcd.h .

References LCD , and LCD_CTRL_EN .

Referenced by LCD_Init() , and SegmentLCD_Disable() .

__STATIC_INLINE void LCD_FrameCountEnable ( bool enable )

Enables or disables LCD Frame Control.

Parameters

[in] enable Boolean true enables frame counter, false disables frame counter.

Definition at line 431 of file em_lcd.h .

References LCD , and LCD_BACTRL_FCEN .

Referenced by 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.

Definition at line 173 of file em_lcd.c .

References _LCD_BACTRL_FCPRESC_MASK , _LCD_BACTRL_FCTOP_MASK , _LCD_BACTRL_FCTOP_SHIFT , LCD_FrameCountInit_TypeDef::enable , LCD , LCD_FrameCountEnable() , LCD_FrameCountInit_TypeDef::prescale , and LCD_FrameCountInit_TypeDef::top .

__STATIC_INLINE void LCD_FreezeEnable ( bool enable )

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.

Definition at line 472 of file em_lcd.h .

References LCD , LCD_FREEZE_REGFREEZE_FREEZE , and LCD_FREEZE_REGFREEZE_UPDATE .

Referenced by SegmentLCD_Number() , SegmentLCD_UnsignedHex() , and SegmentLCD_Write() .

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.

Definition at line 67 of file em_lcd.c .

References _LCD_DISPCTRL_BIAS_MASK , _LCD_DISPCTRL_CONCONF_MASK , _LCD_DISPCTRL_MUX_MASK , _LCD_DISPCTRL_MUXE_MASK , _LCD_DISPCTRL_VLCDSEL_MASK , _LCD_DISPCTRL_WAVE_MASK , LCD_Init_TypeDef::bias , LCD_Init_TypeDef::contrast , LCD_Init_TypeDef::enable , LCD , LCD_ContrastSet() , LCD_Enable() , LCD_Init_TypeDef::mux , LCD_Init_TypeDef::vlcd , and LCD_Init_TypeDef::wave .

Referenced by SegmentLCD_Init() .

__STATIC_INLINE void LCD_IntClear ( uint32_t flags )

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).

Definition at line 600 of file em_lcd.h .

References LCD .

__STATIC_INLINE void LCD_IntDisable ( uint32_t flags )

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).

Definition at line 586 of file em_lcd.h .

References LCD .

Referenced by SegmentLCD_Init() .

__STATIC_INLINE void LCD_IntEnable ( uint32_t flags )

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).

Definition at line 572 of file em_lcd.h .

References LCD .

__STATIC_INLINE uint32_t LCD_IntGet ( void )

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).

Definition at line 514 of file em_lcd.h .

References LCD .

__STATIC_INLINE uint32_t LCD_IntGetEnabled ( void )

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).

Definition at line 537 of file em_lcd.h .

References LCD .

__STATIC_INLINE void LCD_IntSet ( uint32_t flags )

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).

Definition at line 558 of file em_lcd.h .

References LCD .

void LCD_SegmentRangeEnable	(	LCD_SegmentRange_TypeDef	`segmentRange,`
		bool	`enable`
	)

Enables updating this range of LCD segment lines.

Parameters

[in]	`segmentRange`	A range of 4 LCD segment lines to enable or disable for all enabled COM lines.
[in]	`enable`	Boolean true to enable segment updates, false to disable updates.

Definition at line 249 of file em_lcd.c .

References LCD .

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