#include "pcd8544.h"
#include <string.h>

Functions
void	PCD8544_WriteData (uint8_t dat)
	Writes single byte data to PCD8544.

void	PCD8544_WriteSameData (uint8_t dat, uint32_t size)

void	PCD8544_WriteCommand (uint8_t command)
	Write a single byte command to PCD8544.

static void	PCD8544_Transmit (const uint8_t *pDat, uint32_t size)

void	PCD8544_Reset (void)
	Hardware reset PCD8544 LCD.

void	PCD8544_SetPowerDownMode (HAL_State_t state)
	Powerdown mode control.

void	PCD8544_clear (void)

void	PCD8544_SetBias (uint8_t val)
	Set bias system level.

void	PCD8544_SetContrast (uint8_t bias, uint8_t val)
	Set the contrast level by adjusting Vlcd.

void	PCD8544_SetTemperatureCoef (uint8_t val)
	Set TCx (temperature coefficient)

void	PCD8544_SetDisplayAllOn (void)
	Set PCD8544 To Turn On All Segments.

void	PCD8544_SetDisplayInverted (void)
	Set PCD8544 Display Mode to Inverted.

void	PCD8544_SetDisplayBlank (void)
	Set PCD8544 Display Mode to Blank.

void	PCD8544_SetDisplayNormal (void)
	Set PCD8544 Display Mode to Normal.

void	PCD8544_Init (void)
	Initializes PCD8544 Display.

void	PCD8544_SetBackLightState (HAL_State_t state)
	Turn PCD8544 LCD backlight on or off.

void	PCD8544_Fill (uint8_t color)
	Fills entire LCD with specified color.

void	PCD8544_UpdateScreen (void)
	Update LCD display with changes.

void	PCD8544_DrawPixel (uint8_t x, uint8_t y, uint8_t color)
	Draws pixel at desired location.

void	PCD8544_DrawLine (uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint8_t color)
	Draws line on LCD.

void	PCD8544_GotoXY (uint8_t x, uint8_t y)
	Sets cursor pointer to desired location for strings.

char	PCD8544_Putc (char ch, FontDef_t *font, uint8_t color)
	Put one character to internal RAM.

char	PCD8544_Puts (char str, FontDef_t Font, uint8_t color)
	Puts string to internal RAM.

Variables
uint8_t	PCD8544_currentX = 0

uint8_t	PCD8544_currentY = 0

static __XDATA uint8_t	PCD8544_Buffer [PCD8544_WIDTH *PCD8544_HEIGHT/8]

static __CODE uint8_t	Font3x5 []

static __CODE uint8_t	Font5x7 []

__CODE FontDef_t	Font_3x5 = {3, 5, 1, 1, Font3x5}

__CODE FontDef_t	Font_5x7 = {5, 7, 1, 1, Font5x7}

Function Documentation

◆ PCD8544_clear()

void PCD8544_clear ( void )

Definition at line 72 of file pcd8544.c.

{
    PCD8544_WriteCommand(0x0c);
    PCD8544_WriteCommand(0x80);
    PCD8544_WriteSameData(0x00, PCD8544_WIDTH * PCD8544_HEIGHT);
}

◆ PCD8544_DrawLine()

void PCD8544_DrawLine	(	uint16_t	x0,
		uint16_t	y0,
		uint16_t	x1,
		uint16_t	y1,
		uint8_t	color
	)

Draws line on LCD.

Note: PCD8544_UpdateScreen() must be called after that in order to show updates

Parameters

x0	Line X start point, value between [0, PCD8544_WIDTH)
y0	Line Y start point, value between [0, PCD8544_HEIGHT)
x1	Line X end point, value between [0, PCD8544_WIDTH)
y1	Line Y end point, value between [0, PCD8544_HEIGHT)
color	Color to be used. 0x00 or 0x01

Return values

None

Definition at line 177 of file pcd8544.c.

{
    int16_t dx, dy, sx, sy, err, e2, i, tmp; 
    
    /* Check for overflow */
    if (x0 >= PCD8544_WIDTH)
    {
        x0 = PCD8544_WIDTH - 1;
    }
    if (x1 >= PCD8544_WIDTH)
    {
        x1 = PCD8544_WIDTH - 1;
    }
    if (y0 >= PCD8544_HEIGHT)
    {
        y0 = PCD8544_HEIGHT - 1;
    }
    if (y1 >= PCD8544_HEIGHT)
    {
        y1 = PCD8544_HEIGHT - 1;
    }
    
    dx = (x0 < x1) ? (x1 - x0) : (x0 - x1); 
    dy = (y0 < y1) ? (y1 - y0) : (y0 - y1); 
    sx = (x0 < x1) ? 1 : -1; 
    sy = (y0 < y1) ? 1 : -1; 
    err = ((dx > dy) ? dx : -dy) / 2; 
 
    if (dx == 0)
    {
        if (y1 < y0)
        {
            tmp = y1;
            y1 = y0;
            y0 = tmp;
        }
        
        if (x1 < x0)
        {
            tmp = x1;
            x1 = x0;
            x0 = tmp;
        }
        
        /* Vertical line */
        for (i = y0; i <= y1; i++)
        {
            PCD8544_DrawPixel(x0, i, color);
        }
        return;
    }
    
    if (dy == 0)
    {
        if (y1 < y0)
        {
            tmp = y1;
            y1 = y0;
            y0 = tmp;
        }
        
        if (x1 < x0)
        {
            tmp = x1;
            x1 = x0;
            x0 = tmp;
        }
        
        /* Horizontal line */
        for (i = x0; i <= x1; i++)
        {
            PCD8544_DrawPixel(i, y0, color);
        }
        return;
    }
 
    while (1)
    {
        PCD8544_DrawPixel(x0, y0, color);
        if (x0 == x1 && y0 == y1)
        {
            break;
        }
        e2 = err;
        if (e2 > -dx)
        {
            err -= dy;
            x0 += sx;
        }
        if (e2 < dy)
        {
            err += dx;
            y0 += sy;
        }
    }
}

◆ PCD8544_DrawPixel()

void PCD8544_DrawPixel	(	uint8_t	x,
		uint8_t	y,
		uint8_t	color
	)

Draws pixel at desired location.

Note: PCD8544_UpdateScreen() must called after that in order to show updates

Parameters

x	X location, value between [0, PCD8544_WIDTH)
y	Y location, value between [0, PCD8544_HEIGHT)
color	Color to be used for screen fill, 0x00 or 0x01

Return values

None

Definition at line 159 of file pcd8544.c.

{
    if (x >= PCD8544_WIDTH || y >= PCD8544_HEIGHT)
    {
        /* Error */
        return;
    }
 
    if (color == 0x01)
    {
        PCD8544_Buffer[x + (y / 8) * PCD8544_WIDTH] |= 1 << (y % 8);
    }
    else
    {
        PCD8544_Buffer[x + (y / 8) * PCD8544_WIDTH] &= ~(1 << (y % 8));
    }
}

◆ PCD8544_Fill()

void PCD8544_Fill ( uint8_t color )

Fills entire LCD with specified color.

Note: PCD8544_UpdateScreen() must be called after that in order to see updates

Parameters

Color Color to be used for screen fill, 0x00 or 0x01

Return values

None

Definition at line 141 of file pcd8544.c.

{
    /* Set memory */
    memset((uint8_t *)PCD8544_Buffer, (color == 0x00) ? 0x00 : 0xFF, sizeof(PCD8544_Buffer));
}

◆ PCD8544_GotoXY()

void PCD8544_GotoXY	(	uint8_t	x,
		uint8_t	y
	)

Sets cursor pointer to desired location for strings.

Parameters

x	X location, value between [0, PCD8544_WIDTH)
y	Y location, value between [0, PCD8544_HEIGHT)

Return values

None

Definition at line 274 of file pcd8544.c.

{
    /* Set write pointers */
    PCD8544_currentX = x;
    PCD8544_currentY = y;
}

◆ PCD8544_Init()

void PCD8544_Init ( void )

Initializes PCD8544 Display.

Parameters

None

Return values

None

Definition at line 129 of file pcd8544.c.

{
    PCD8544_Reset();
    PCD8544_SetContrast(0x06, 0x20);
    PCD8544_SetDisplayNormal();
}

◆ PCD8544_Putc()

char PCD8544_Putc	(	char	ch,
		FontDef_t *	font,
		uint8_t	color
	)

Put one character to internal RAM.

Note: PCD8544_UpdateScreen() must be called after that in order to show updates

Parameters

ch	Character to be written
*Font	Pointer to FontDef_t structure with used font
color	Color used for drawing. 0x00 or 0x01

Return values

value of ch

Definition at line 281 of file pcd8544.c.

{
    uint32_t i, b, j, k;
 
    for (i = 0; i < font->height; i++)
    {
        for (j = 0; j < font->bytes; j++)
        {
            b = font->dat[((ch - 32) * font->height + i) * font->bytes + j];
            if (font->order == 0)
            {
                for (k = 0; k < 8 && k < font->width - j * 8; k++)
                {
                    if ((b << k) & 0x80)
                    {
                        PCD8544_DrawPixel(PCD8544_currentX + (j * 8) + k, (PCD8544_currentY + i), (uint8_t) color);
                    }
                    else
                    {
                        PCD8544_DrawPixel(PCD8544_currentX + (j * 8) + k, (PCD8544_currentY + i), (uint8_t) !color);
                    }
                }
            }
            else
            {
                for (k = 0; k < 8 && k < font->width - j * 8; k++)
                {
                    if (b & (0x0001 << k))
                    {
                        PCD8544_DrawPixel(PCD8544_currentX + (j * 8) + k, (PCD8544_currentY + i), (uint8_t) color);
                    }
                    else
                    {
                        PCD8544_DrawPixel(PCD8544_currentX + (j * 8) + k, (PCD8544_currentY + i), (uint8_t) !color);
                    }
                }
            }
        }
    }
 
    /* Increase pointer */
    PCD8544_currentX += font->width + 1;
 
    /* Return character written */
    return ch;
}

◆ PCD8544_Puts()

char PCD8544_Puts	(	char *	str,
		FontDef_t *	Font,
		uint8_t	color
	)

Puts string to internal RAM.

Note: PCD8544_UpdateScreen() must be called after that in order to show updates

Parameters

*str	String to be written
*Font	Pointer to FontDef_t structure with used font
color	Color used for drawing. 0x00 or 0x01

Return values

Zero	on success or character value when function failed

Definition at line 328 of file pcd8544.c.

{
    /* Write characters */
    while (*str)
    {
        /* Write character by character */
        if (PCD8544_Putc(*str, Font, color) != *str)
        {
            /* Return error */
            return *str;
        }
        
        /* Increase string pointer */
        str++;
    }
    
    /* Everything OK, zero should be returned */
    return *str;
}

◆ PCD8544_Reset()

void PCD8544_Reset ( void )

Hardware reset PCD8544 LCD.

Parameters

None

Return values

None

Definition at line 57 of file pcd8544.c.

{
    PCD8544_RES = 0;
    SYS_Delay(5);
    PCD8544_RES = 1;
}

◆ PCD8544_SetBackLightState()

void PCD8544_SetBackLightState ( HAL_State_t state )

Turn PCD8544 LCD backlight on or off.

Parameters

state HAL_State_ON:on, HAL_State_OFF:off

Return values

None

Definition at line 136 of file pcd8544.c.

{
    PCD8544_BL = (state == HAL_State_ON)? SET : RESET;
}

◆ PCD8544_SetBias()

void PCD8544_SetBias ( uint8_t val )

Set bias system level.

Parameters

val	bias value, [0x00,0x07], small value may lead to totally blank display

Return values

None

Definition at line 79 of file pcd8544.c.

{
    val = val & 0x07;
    PCD8544_WriteCommand(PCD8544_FUNCTIONSET | PCD8544_EXT_INSTRUCTION);
    PCD8544_WriteCommand(PCD8544_SET_BIAS | val);
    PCD8544_WriteCommand(PCD8544_FUNCTIONSET);
}

◆ PCD8544_SetContrast()

void PCD8544_SetContrast	(	uint8_t	bias,
		uint8_t	val
	)

Set the contrast level by adjusting Vlcd.

Parameters

bias,bias	value, [0x00,0x07], small value may lead to totally blank display
val	contrast level, [0x00, 0x7F]

Return values

None

Definition at line 87 of file pcd8544.c.

{
    bias = bias & 0x07;
    val = val & 0x7F;
    // Extended instruction set
    PCD8544_WriteCommand(PCD8544_FUNCTIONSET | PCD8544_EXT_INSTRUCTION);
    // Set Bias System, value can be [0x03, 0x07]
    PCD8544_WriteCommand(PCD8544_SET_BIAS | bias);
    // Set Vop, value can be [0x01, 0x7F]
    PCD8544_WriteCommand(PCD8544_SET_VOP | val);
    // Change back to basic instruction set
    PCD8544_WriteCommand(PCD8544_FUNCTIONSET);
}

◆ PCD8544_SetDisplayAllOn()

void PCD8544_SetDisplayAllOn ( void )

Set PCD8544 To Turn On All Segments.

Parameters

None

Return values

None

Definition at line 109 of file pcd8544.c.

{
    PCD8544_WriteCommand(PCD8544_DISPLAY_CONTROL | PCD8544_DISPLAY_ALLON);
}

◆ PCD8544_SetDisplayBlank()

void PCD8544_SetDisplayBlank ( void )

Set PCD8544 Display Mode to Blank.

Parameters

None

Return values

None

Definition at line 119 of file pcd8544.c.

{
    PCD8544_WriteCommand(PCD8544_DISPLAY_CONTROL | PCD8544_DISPLAY_BLANK);
}

◆ PCD8544_SetDisplayInverted()

void PCD8544_SetDisplayInverted ( void )

Set PCD8544 Display Mode to Inverted.

Parameters

None

Return values

None

Definition at line 114 of file pcd8544.c.

{
    PCD8544_WriteCommand(PCD8544_DISPLAY_CONTROL | PCD8544_DISPLAY_INVERTED);
}

◆ PCD8544_SetDisplayNormal()

void PCD8544_SetDisplayNormal ( void )

Set PCD8544 Display Mode to Normal.

Parameters

None

Return values

None

Definition at line 124 of file pcd8544.c.

{
    PCD8544_WriteCommand(PCD8544_DISPLAY_CONTROL | PCD8544_DISPLAY_NORMAL);
}

◆ PCD8544_SetPowerDownMode()

void PCD8544_SetPowerDownMode ( HAL_State_t state )

Powerdown mode control.

Parameters

state HAL_State_ON:powerdown mode, HAL_State_OFF:work mode

Return values

None

Definition at line 64 of file pcd8544.c.

{
    if (state == HAL_State_ON)
        PCD8544_WriteCommand(PCD8544_FUNCTIONSET | PCD8544_POWERDOWN);
    else
        PCD8544_WriteCommand(PCD8544_FUNCTIONSET);
}

◆ PCD8544_SetTemperatureCoef()

void PCD8544_SetTemperatureCoef ( uint8_t val )

Set TCx (temperature coefficient)

Parameters

val	TCx value, [0x00, 0x03]

Return values

None

Definition at line 101 of file pcd8544.c.

{
    val = val & 0x03;
    PCD8544_WriteCommand(PCD8544_FUNCTIONSET | PCD8544_EXT_INSTRUCTION);
    PCD8544_WriteCommand(PCD8544_SET_TEMP | val);
    PCD8544_WriteCommand(PCD8544_FUNCTIONSET);
}

◆ PCD8544_Transmit()

static void PCD8544_Transmit	(	const uint8_t *	pDat,
		uint32_t	size
	)

static

Definition at line 47 of file pcd8544.c.

{
    PCD8544_CS = 0;
    do
    {
        SPI_TxRx(*pDat++);
    } while (--size);
    PCD8544_CS = 1;
}

◆ PCD8544_UpdateScreen()

void PCD8544_UpdateScreen ( void )

Update LCD display with changes.

Note: Call this function each time when display is changed

Parameters

None

Return values

None

Definition at line 147 of file pcd8544.c.

{
    uint8_t i = 0, *pt = PCD8544_Buffer;
    for (i = 0; i < PCD8544_PAGES; i++)
    {
        PCD8544_WriteCommand(PCD8544_SET_YADDR | i);
        PCD8544_WriteCommand(PCD8544_SET_XADDR);
        PCD8544_Transmit(pt + (PCD8544_WIDTH * i), PCD8544_WIDTH);
    }
    PCD8544_WriteCommand(PCD8544_SET_YADDR);
}

◆ PCD8544_WriteCommand()

void PCD8544_WriteCommand ( uint8_t command )

Write a single byte command to PCD8544.

Parameters

command command to be written

Return values

None

Definition at line 40 of file pcd8544.c.

{
    PCD8544_DC = 0;
    PCD8544_WriteData(command);
    PCD8544_DC = 1;
}

◆ PCD8544_WriteData()

void PCD8544_WriteData ( uint8_t dat )

Writes single byte data to PCD8544.

Parameters

dat	data to be written

Return values

None

Definition at line 23 of file pcd8544.c.

{
    PCD8544_CS = 0;
    SPI_TxRx(dat);
    PCD8544_CS = 1;
}

◆ PCD8544_WriteSameData()

void PCD8544_WriteSameData	(	uint8_t	dat,
		uint32_t	size
	)

Definition at line 30 of file pcd8544.c.

{
    PCD8544_CS = 0;
    do
    {
        SPI_TxRx(dat);
    } while (--size);
    PCD8544_CS = 1;
}

Variable Documentation

◆ Font3x5

__CODE uint8_t Font3x5[]

static

Definition at line 349 of file pcd8544.c.

◆ Font5x7

__CODE uint8_t Font5x7[]

static

Definition at line 448 of file pcd8544.c.

◆ Font_3x5

__CODE FontDef_t Font_3x5 = {3, 5, 1, 1, Font3x5}

Definition at line 547 of file pcd8544.c.

◆ Font_5x7

__CODE FontDef_t Font_5x7 = {5, 7, 1, 1, Font5x7}

Definition at line 548 of file pcd8544.c.

◆ PCD8544_Buffer

__XDATA uint8_t PCD8544_Buffer[PCD8544_WIDTH *PCD8544_HEIGHT/8]

static

Definition at line 21 of file pcd8544.c.

◆ PCD8544_currentX

uint8_t PCD8544_currentX = 0

Definition at line 19 of file pcd8544.c.

◆ PCD8544_currentY

uint8_t PCD8544_currentY = 0

Definition at line 20 of file pcd8544.c.

Functions

Variables

Function Documentation

◆ PCD8544_clear()

◆ PCD8544_DrawLine()

◆ PCD8544_DrawPixel()

◆ PCD8544_Fill()

◆ PCD8544_GotoXY()

◆ PCD8544_Init()

◆ PCD8544_Putc()

◆ PCD8544_Puts()

◆ PCD8544_Reset()

◆ PCD8544_SetBackLightState()

◆ PCD8544_SetBias()

◆ PCD8544_SetContrast()

◆ PCD8544_SetDisplayAllOn()

◆ PCD8544_SetDisplayBlank()

◆ PCD8544_SetDisplayInverted()

◆ PCD8544_SetDisplayNormal()

◆ PCD8544_SetPowerDownMode()

◆ PCD8544_SetTemperatureCoef()

◆ PCD8544_Transmit()

◆ PCD8544_UpdateScreen()

◆ PCD8544_WriteCommand()

◆ PCD8544_WriteData()

◆ PCD8544_WriteSameData()

Variable Documentation

◆ Font3x5

◆ Font5x7

◆ Font_3x5

◆ Font_5x7

◆ PCD8544_Buffer

◆ PCD8544_currentX

◆ PCD8544_currentY