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ST7920.c
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/* ************************************************************************
*
* driver functions for ST7920 compatible graphic displays
* - 128 x 64 pixels
* - other resolutions are not supported because of different address
* to pixel mappings
* (64 x 32 pixels native, with ST7921s up to 256 x 64)
* - interfaces
* - 3 line SPI
* - 4 bit parallel interface
* - 8 bit parallel interface (not supported)
*
* (c) 2017-2021 by Markus Reschke
*
* ************************************************************************ */
/*
* hints:
* - pin assignment for SPI
* /XRESET Vcc or LCD_RESET (optional)
* CS (RS) Gnd or LCD_CS (optional)
* SCLK (E) LCD_SCLK
* SID (RW) LCD_SID
* PSB Gnd (enable serial mode)
* For hardware SPI LCD_SCLK and LCD_SID have to be the MCU's SCK and
* MOSI pins.
* - max. SPI clock: 2.5MHz at 4.5V / 1.6MHz at 2.7V
* - write only when using SPI
* - doesn't allow other SPI chips on same bus (says the datasheet)
* - pin assignment for 4 bit parallel
* /XRESET Vcc or LCD_RESET (optional)
* E LCD_EN
* RS LCD_RS
* RW Gnd or LCD_RW (optional)
* D4 LCD_DB4 (default: LCD_PORT pin #0)
* D5 LCD_DB5 (default: LCD_PORT pin #1)
* D6 LCD_DB6 (default: LCD_PORT pin #2)
* D7 LCD_DB7 (default: LCD_PORT pin #3)
* PSB pull-up resistor to Vcc (enable parallel mode)
*/
/* local includes */
#include "config.h" /* global configuration */
#ifdef LCD_ST7920
/*
* local constants
*/
/* source management */
#define LCD_DRIVER_C
/*
* include header files
*/
/* local includes */
#include "common.h" /* common header file */
#include "variables.h" /* global variables */
#include "functions.h" /* external functions */
#include "ST7920.h" /* ST7920 specifics */
/*
* fonts and symbols
* - Because of the horizontal addressing we're stuck with 8 pixels in x
* direction for the font. And we don't want to use a pixel screen buffer.
*/
#ifndef LCD_ROT180
/* horizontally aligned */
#include "font_8x8_h.h"
#include "font_8x8_iso8859-2_h.h"
#include "symbols_24x24_h.h"
#endif
#ifdef LCD_ROT180
/* horizontally aligned, horizontal bit order flipped */
#include "font_8x8_hf.h"
#include "font_8x8_iso8859-2_hf.h"
#include "symbols_24x24_hf.h"
#endif
/* sanity check */
#ifndef FONT_SET
#error <<< No font selected! >>>
#endif
#ifdef SW_SYMBOLS
#ifndef SYMBOL_SET
#error <<< No symbols selected! >>>
#endif
#endif
/*
* derived constants
*/
/* number of 16 bit steps for x direction */
#define LCD_STEPS_X (LCD_DOTS_X / 16)
/* number of lines and characters per line */
#define LCD_CHAR_X (LCD_DOTS_X / FONT_SIZE_X)
#define LCD_CHAR_Y (LCD_DOTS_Y / FONT_SIZE_Y)
/* component symbols */
#ifdef SW_SYMBOLS
/* number of 16 bit steps for x direction */
#define LCD_SYMBOL_STEPS_X (SYMBOL_SIZE_X / 16)
/* size in relation to a character */
#define LCD_SYMBOL_CHAR_X ((SYMBOL_SIZE_X + FONT_SIZE_X - 1) / FONT_SIZE_X)
#define LCD_SYMBOL_CHAR_Y ((SYMBOL_SIZE_Y + FONT_SIZE_Y - 1) / FONT_SIZE_Y)
/* check x size: we need at least 3 chars */
#if LCD_SYMBOL_CHAR_X < 3
#error <<< Symbols too small! >>>
#endif
#endif
/*
* local variables
*/
/* character matrix (copy of screen, horizontally aligned) */
unsigned char Matrix[LCD_CHAR_X * LCD_CHAR_Y]; /* char matrix */
/* position management */
uint8_t X_Start; /* start position X (column in 16 bit steps) */
uint8_t Y_Start; /* start position Y (row) */
/*
* function declarations (prototypes)
*/
void LCD_Char(unsigned char Char);
/* ************************************************************************
* low level functions for 4 bit parallel interface
* ************************************************************************ */
#ifdef LCD_PAR_4
/*
* set up interface bus
* - should be called at firmware startup
*/
void LCD_BusSetup(void)
{
uint8_t Bits; /* register bits */
/*
* set control signals
*/
/* set directions */
Bits = LCD_DDR; /* get current directions */
/* required pins */
Bits |= (1 << LCD_RS) | (1 << LCD_EN) |
(1 << LCD_DB4) | (1 << LCD_DB5) | (1 << LCD_DB6) | (1 << LCD_DB7);
/* optional output pins */
#ifdef LCD_RESET
Bits |= (1 << LCD_RESET);
#endif
#ifdef LCD_RW
Bits |= (1 << LCD_RW);
#endif
LCD_DDR = Bits; /* set new directions */
/* set default levels */
/* LCD_EN should be low by default */
#ifdef LCD_RESET
/* disable reset */
LCD_PORT |= (1 << LCD_RESET); /* set /RESET high */
#endif
/* LCD_RW should be low by default (write mode) */
}
/*
* send a nibble to the LCD (4 bit mode)
*
* requires:
* - nibble value to send
*/
void LCD_SendNibble(uint8_t Nibble)
{
uint8_t Data;
Data = LCD_PORT; /* get current bits */
/* clear all 4 data lines */
Data &= ~((1 << LCD_DB4) | (1 << LCD_DB5) | (1 << LCD_DB6) | (1 << LCD_DB7));
#ifdef LCD_DB_STD
/* standard pins: simply take nibble */
Data |= Nibble;
#else
/* non-standard pins: set bits individually */
if (Nibble & 0b00000001) Data |= (1 << LCD_DB4);
if (Nibble & 0b00000010) Data |= (1 << LCD_DB5);
if (Nibble & 0b00000100) Data |= (1 << LCD_DB6);
if (Nibble & 0b00001000) Data |= (1 << LCD_DB7);
#endif
LCD_PORT = Data; /* set nibble */
/* enable pulse */
LCD_PORT |= (1 << LCD_EN); /* set EN high */
wait1us(); /* wait >= 140ns */
LCD_PORT &= ~(1 << LCD_EN); /* set EN low */
/* data hold time >= 20ns */
/* Enable cycle time >= 1200ns */
wait1us(); /* wait 1µs */
}
/*
* send a byte (data or command) to the LCD
* - send byte as two nibbles (MSB first, LSB last)
*
* requires:
* - byte value to send
*/
void LCD_Send(uint8_t Byte)
{
uint8_t Nibble;
/* send upper nibble (bits 4-7) */
Nibble = (Byte >> 4) & 0x0F; /* get upper nibble */
LCD_SendNibble(Nibble);
/* send lower nibble (bits 0-3) */
Nibble = Byte & 0x0F; /* get lower nibble */
LCD_SendNibble(Nibble);
}
/*
* send a command to the LCD
*
* requires:
* - byte value to send
*/
void LCD_Cmd(uint8_t Byte)
{
/* indicate command mode */
LCD_PORT &= ~(1 << LCD_RS); /* set RS low */
#ifdef LCD_RW
/* write mode */
LCD_PORT &= ~(1 << LCD_RW); /* set RW low */
#endif
LCD_Send(Byte); /* send command */
}
/*
* send data to the LCD
*
* requires:
* - byte value to send
*/
void LCD_Data(uint8_t Byte)
{
/* indicate data mode */
LCD_PORT |= (1 << LCD_RS); /* set RS high */
#ifdef LCD_RW
/* write mode */
LCD_PORT &= ~(1 << LCD_RW); /* set RW low */
#endif
LCD_Send(Byte); /* send data */
wait100us(); /* 72µs processing delay */
}
#endif
/* ************************************************************************
* low level functions for 3 line SPI interface
* ************************************************************************ */
#ifdef LCD_SPI
/*
* set up interface bus
* - should be called at firmware startup
*/
void LCD_BusSetup(void)
{
uint8_t Bits; /* register bits */
/*
* set control signals
*/
/* set directions */
Bits = LCD_DDR; /* get current directions */
/* optional output pins */
#ifdef LCD_RESET
Bits |= (1 << LCD_RESET);
#endif
#ifdef LCD_CS
Bits |= (1 << LCD_CS);
#endif
LCD_DDR = Bits; /* set new directions */
/* set default levels */
/* LCD_CS should be low by default */
#ifdef LCD_RESET
/* disable reset */
LCD_PORT |= (1 << LCD_RESET); /* set /RESET high */
#endif
/*
* init SPI bus
* - SPI bus is set up already in main()
*/
#ifdef SPI_HARDWARE
/*
* set SPI clock rate (max. 2.5MHz)
*/
/* 1MHz -> f_osc/2 (SPR1 = 0, SPR0 = 0, SPI2X = 1) */
#if CPU_FREQ / 1000000 == 1
SPI.ClockRate = SPI_CLOCK_2X;
#endif
/* 8MHz -> f_osc/4 (SPR1 = 0, SPR0 = 0, SPI2X = 0) */
#if CPU_FREQ / 1000000 == 8
SPI.ClockRate = 0
#endif
/* 16MHz -> f_osc/8 (SPR1 = 0, SPR0 = 1, SPI2X = 1) */
#if CPU_FREQ / 1000000 == 16
SPI.ClockRate = SPI_CLOCK_R0 | SPI_CLOCK_2X;
#endif
/* 20MHz -> f_osc/8 (SPR1 = 0, SPR0 = 1, SPI2X = 1) */
#if CPU_FREQ / 1000000 == 20
SPI.ClockRate = SPI_CLOCK_R0 | SPI_CLOCK_2X;
#endif
SPI_Clock(); /* update SPI clock */
#endif
}
/*
* send a byte (command or data) to the LCD
* - hint: ST7920 doesn't take multiple bytes after the start byte.
*
* requires:
* - byte value to send
*/
void LCD_Send(uint8_t Byte)
{
uint8_t Nibble;
/* upper nibble plus 4 zeros */
Nibble = Byte & 0xF0;
SPI_Write_Byte(Nibble); /* write byte */
/* lower nibble plus 4 zeros */
Nibble = Byte << 4;
SPI_Write_Byte(Nibble); /* write byte */
}
/*
* send a command to the LCD
*
* requires:
* - byte value to send
*/
void LCD_Cmd(uint8_t Byte)
{
uint8_t Start;
#ifdef LCD_CS
/* select chip */
LCD_PORT |= (1 << LCD_CS); /* set CS high */
#endif
/* start byte */
Start = START_BYTE | FLAG_WRITE | FLAG_CMD;
SPI_Write_Byte(Start); /* write start byte */
LCD_Send(Byte); /* write command */
#ifdef LCD_CS
/* deselect chip */
LCD_PORT &= ~(1 << LCD_CS); /* set CS low */
#endif
}
/*
* send data to the LCD
*
* requires:
* - byte value to send
*/
void LCD_Data(uint8_t Byte)
{
uint8_t Start;
#ifdef LCD_CS
/* select chip */
LCD_PORT |= (1 << LCD_CS); /* set CS high */
#endif
/* start byte */
Start = START_BYTE | FLAG_WRITE | FLAG_DATA;
SPI_Write_Byte(Start); /* write start byte */
LCD_Send(Byte); /* write data */
#ifdef LCD_CS
/* deselect chip */
LCD_PORT &= ~(1 << LCD_CS); /* set CS low */
#endif
/* todo: do we need a 72µs delay for LCD processing? */
wait50us(); /* 72µs processing delay */
}
#endif
/* ************************************************************************
* high level functions
* ************************************************************************ */
/*
* set LCD dot position
* - horizontal position is based on 16 bit steps
* - top left: 0/0
*
* requires:
* - x: horizontal position (0-)
* - y: vertical position (0-)
*/
void LCD_DotPos(uint8_t x, uint8_t y)
{
uint8_t Cmd_X; /* command for setting x */
uint8_t Cmd_Y; /* command for setting y */
/* in case of a low MCU clock */
wdt_reset(); /* reset watchdog */
/* take care about address to pixel mapping */
if (y < 32) /* top LCD half (0-31) */
{
/* left address space is mapped to top LCD half */
Cmd_Y = CMD_SET_GDRAM_ADDR | y; /* vertical address */
Cmd_X = CMD_SET_GDRAM_ADDR | x; /* horizontal address */
}
else /* bottom LCD half (32-63) */
{
/* right address space is mapped to bottom LCD half */
Cmd_Y = CMD_SET_GDRAM_ADDR | (y - 32); /* vertical address */
Cmd_X = CMD_SET_GDRAM_ADDR | 8 | x; /* horizontal address */
}
LCD_Cmd(Cmd_Y); /* set vertical address */
wait100us(); /* 72µs processing delay */
LCD_Cmd(Cmd_X); /* set horizontal address */
wait100us(); /* 72µs processing delay */
/*
* The ST7920 seems to have a bug when setting the GDRAM address without
* sending any data afterwards. A second CMD_SET_GDRAM_ADDR causes a
* the output of 16 bits in a row. So we should call LCD_DotPos() only if
* we also send data.
*/
}
#ifndef LCD_ROT180
/*
* set LCD character position
* - top left: 1/1
*
* requires:
* - x: horizontal position (1-)
* - y: vertical position (1-)
*/
void LCD_CharPos(uint8_t x, uint8_t y)
{
/* update UI */
UI.CharPos_X = x;
UI.CharPos_Y = y;
/*
* calculate dot position
* - top left of character
*/
/* horizontal position (column in 16 bit steps) */
x--; /* columns start at 0 */
x *= FONT_SIZE_X; /* offset for character */
x /= 16; /* convert into 16 bit steps */
X_Start = x; /* update start position */
/* vertical position (row) */
y--; /* rows start at 0 */
y *= FONT_SIZE_Y; /* offset for character */
Y_Start = y; /* update start position */
/*
* we don't call LCD_DotPos() here
* - see LCD_DotPos() for explanation
*/
}
#endif
#ifdef LCD_ROT180
/*
* set LCD character position
* - version for display rotated by 180°
* - top left: 1/1
*
* requires:
* - x: horizontal position (1-)
* - y: vertical position (1-)
*/
void LCD_CharPos(uint8_t x, uint8_t y)
{
/* update UI */
UI.CharPos_X = x;
UI.CharPos_Y = y;
/*
* calculate dot position
* - top right of character (180° view)
* or bottom left for 0° view
*/
/* horizontal position (column in 16 bit steps), flipped */
x--; /* columns start at 0 */
x *= FONT_SIZE_X; /* offset for character */
x /= 16; /* convert into 16 bit steps */
X_Start = (LCD_STEPS_X - 1) - x; /* update start position */
/* vertical position (row), flipped */
y--; /* rows start at 0 */
y *= FONT_SIZE_Y; /* offset for character */
Y_Start = (LCD_DOTS_Y - 1) - y; /* update start position */
/*
* we don't call LCD_DotPos() here
* - see LCD_DotPos() for explaination
*/
}
#endif
#ifndef LCD_ROT180
/*
* clear one single character line
*
* requires:
* - Line: line number (1-)
* special case line 0: clear remaining space in current line
*/
void LCD_ClearLine(uint8_t Line)
{
uint8_t n = 1; /* counter */
uint8_t Temp; /* temp. value */
uint8_t MatrixFlag = 1; /* control flag */
unsigned char *Buffer; /* char matrix */
if (Line == 0) /* special case: rest of current line */
{
Line = UI.CharPos_Y; /* get current line */
n = UI.CharPos_X; /* get current character position */
}
/* check for row overflow */
Temp = Line - 1; /* rows start at 0 */
Temp *= FONT_SIZE_Y; /* offset for line */
if (Temp > (LCD_DOTS_Y - 1)) return; /* overflow */
LCD_CharPos(n, Line); /* set char position */
if ((n % 2) == 0) /* left neighbor */
{
LCD_Char(' '); /* display space and keep neighbor */
n++; /* one char done */
}
/* set start position in char matrix */
Buffer = (unsigned char *)&Matrix; /* start of matrix */
Temp = (Line - 1) * LCD_CHAR_X; /* offset for line */
Temp += (n - 1); /* offset for column */
Buffer += Temp; /* add offset for position */
/* init row range */
if (Line <= LCD_CHAR_Y) /* within character lines */
{
/* clear character line */
n = FONT_SIZE_Y; /* number of rows to clear */
}
else /* remaining rows */
{
/* clear up to last row */
n = LCD_DOTS_Y - Y_Start; /* number of rows to clear */
MatrixFlag = 0; /* don't clear chars in matrix (overflow) */
}
/* clear line */
Line = Y_Start; /* starting row */
while (n > 0) /* loop for rows */
{
LCD_DotPos(X_Start, Line); /* set new dot position */
Temp = LCD_STEPS_X - X_Start; /* number of columns */
while (Temp > 0) /* loop for columns */
{
LCD_Data(0); /* clear 8 pixels */
LCD_Data(0); /* clear another 8 pixels */
Temp--; /* next 16 bit step */
if (MatrixFlag) /* clear char in char matrix */
{
*Buffer = ' '; /* set space */
Buffer++; /* next char */
*Buffer = ' '; /* set space */
Buffer++; /* next char */
}
}
MatrixFlag = 0; /* reset flag */
Line++; /* next row */
n--; /* next row */
}
}
#endif
#ifdef LCD_ROT180
/*
* clear one single character line
* - version for display rotated by 180°
*
* requires:
* - Line: line number (1-)
* special case line 0: clear remaining space in current line
*/
void LCD_ClearLine(uint8_t Line)
{
uint8_t n = 1; /* counter */
uint8_t Temp; /* temp. value */
uint8_t MatrixFlag = 1; /* flag for matrix update */
unsigned char *Buffer; /* char matrix */
if (Line == 0) /* special case: rest of current line */
{
Line = UI.CharPos_Y; /* get current line */
n = UI.CharPos_X; /* get current character position */
}
/* check for row overflow */
Temp = Line - 1; /* rows start at 0 */
Temp *= FONT_SIZE_Y; /* offset for line */
if (Temp > (LCD_DOTS_Y - 1)) return; /* overflow */
/*
* Because of the ST7920's fixed X address logic, we clear each line
* starting at the end of the textline. Also we clear lines starting
* with the bottom one to follow the vertical text direction.
*/
LCD_CharPos(n, Line); /* set char position */
if ((n % 2) == 0) /* left neighbor */
{
LCD_Char(' '); /* display space and keep neighbor */
}
/* set start position in char matrix (end of line) */
Buffer = (unsigned char *)&Matrix; /* start of matrix */
Temp = Line * LCD_CHAR_X; /* offset for next line */
Temp -= 1; /* offset for end of current line */
Buffer += Temp; /* add offset for position */
/* init row range (starting at bottom) */
if (Line <= LCD_CHAR_Y) /* within character lines */
{
/* clear character line */
n = FONT_SIZE_Y; /* number of rows to clear */
}
else /* remaining rows */
{
/* clear up to last row */
n = Y_Start + 1; /* number of rows to clear */
MatrixFlag = 0; /* don't clear chars in matrix (overflow) */
}
/* clear line */
Line = Y_Start; /* starting row */
while (n > 0) /* loop for rows */
{
LCD_DotPos(0, Line); /* set new dot position */
Temp = X_Start + 1; /* number of column steps */
while (Temp > 0) /* loop for columns */
{
LCD_Data(0); /* clear 8 pixels */
LCD_Data(0); /* clear another 8 pixels */
Temp--; /* next 16 bit step */
if (MatrixFlag) /* clear char in char matrix */
{
*Buffer = ' '; /* set space */
Buffer--; /* next char */
*Buffer = ' '; /* set space */
Buffer--; /* next char */
}
}
MatrixFlag = 0; /* reset flag */
Line--; /* next row */
n--; /* next row */
}
}
#endif
/*
* clear the display
*/
void LCD_Clear(void)
{
uint8_t n = 1; /* counter */
/* we have to clear all dots manually :( */
/* loop for all lines plus possible remaining row */
while (n <= (LCD_CHAR_Y + 1))
{
LCD_ClearLine(n); /* clear line */
n++; /* next line */
}
LCD_CharPos(1, 1); /* reset character position */
}
/*
* initialize LCD
*/
void LCD_Init(void)
{
MilliSleep(40); /* wait 40ms for Vcc to become stable */
#ifdef LCD_RESET
/* reset display */
LCD_PORT &= ~(1 << LCD_RESET); /* set /RES low */
wait10us(); /* wait 10µs */
LCD_PORT |= (1 << LCD_RESET); /* set /RES high */
MilliSleep(1); /* wait 1ms */
#endif
/*
* init LCD module
*/
#ifdef LCD_PAR_4
/* setup for 4 bit parallel interface */
LCD_Cmd(CMD_FUNCTION_SET | FLAG_INTERFACE_4BIT);
wait100us(); /* 72µs processing delay */
LCD_Cmd(CMD_FUNCTION_SET | FLAG_INTERFACE_4BIT);
wait100us(); /* 72µs processing delay */
#endif
#ifdef LCD_SPI
/* setup for SPI and 8 bit parallel interface */
LCD_Cmd(CMD_FUNCTION_SET | FLAG_INTERFACE_8BIT);
wait100us(); /* 72µs processing delay */
LCD_Cmd(CMD_FUNCTION_SET | FLAG_INTERFACE_8BIT);
wait100us(); /* 72µs processing delay */
#endif
/* switch display on */
LCD_Cmd(CMD_DISPLAY | FLAG_DISPLAY_ON);
wait100us(); /* 72µs processing delay */
/* clear display */
LCD_Cmd(CMD_CLEAR);
MilliSleep(2); /* 1.6ms processing delay */
/* entry mode: left to right, no scrolling */
LCD_Cmd(CMD_ENTRY_MODE | FLAG_INCREASE);
wait100us(); /* 72µs processing delay */
/*
* enter graphics mode
*/
#ifdef LCD_PAR_4
/* enable extended instruction set */
LCD_Cmd(CMD_FUNCTION_SET | FLAG_INTERFACE_4BIT | FLAG_CMD_EXT);
wait100us(); /* 72µs processing delay */
/* enable graphics mode */
LCD_Cmd(CMD_EXT_FUNC_SET | FLAG_INTERFACE_4BIT | FLAG_CMD_EXT | FLAG_GFX_ON);
wait100us(); /* 72µs processing delay */
#endif
#ifdef LCD_SPI
/* enable extended instruction set */
LCD_Cmd(CMD_FUNCTION_SET | FLAG_INTERFACE_8BIT | FLAG_CMD_EXT);
wait100us(); /* 72µs processing delay */
/* enable graphics mode */
LCD_Cmd(CMD_EXT_FUNC_SET | FLAG_INTERFACE_8BIT | FLAG_CMD_EXT | FLAG_GFX_ON);
wait100us(); /* 72µs processing delay */
#endif
/* update maximums */
UI.CharMax_X = LCD_CHAR_X; /* characters per line */
UI.CharMax_Y = LCD_CHAR_Y; /* lines */
#ifdef SW_SYMBOLS
UI.SymbolSize_X = LCD_SYMBOL_CHAR_X; /* x size in chars */
UI.SymbolSize_Y = LCD_SYMBOL_CHAR_Y; /* y size in chars */
#endif
LCD_Clear(); /* clear screen */
}
#ifndef LCD_ROT180
/*
* display a single character
*
* requires:
* - Char: character to display
*/
void LCD_Char(unsigned char Char)
{
uint8_t *Table1; /* pointer to table */
uint8_t *Table2; /* pointer to table */
unsigned char *Buffer;
uint8_t Index; /* font index */
uint16_t Offset; /* address offset */
uint8_t Neighbor; /* neighboring character */
uint8_t StepFlag; /* offset control flag */
uint8_t y; /* bitmap y byte counter */
uint8_t Row; /* screen row */
/* prevent x overflow */
if (UI.CharPos_X > LCD_CHAR_X) return;
/*
* get bitmap of character
*/
/* get font index number from lookup table */
Table1 = (uint8_t *)&FontTable; /* start address */
Table1 += Char; /* add offset for character */
Index = pgm_read_byte(Table1); /* get index number */
if (Index == 0xff) return; /* no character bitmap available */
/* calculate start address of character bitmap */
Table1 = (uint8_t *)&FontData; /* start address of font data */
Offset = FONT_BYTES_N * Index; /* offset for character */
Table1 += Offset; /* address of character data */
/*
* get bitmap of neighbor
*/
/* get neighboring character from char matrix */
StepFlag = 0; /* right by default */
Index = (UI.CharPos_Y - 1) * LCD_CHAR_X; /* offset for line */
Index += UI.CharPos_X; /* offset for column (right neighbor) */
if ((UI.CharPos_X % 2) == 0) /* got left neighbor */
{
StepFlag = 1; /* set flag */
Index -= 2; /* adjust buffer offset */
}
Buffer = (unsigned char *)&Matrix; /* start of matrix */
Buffer += Index; /* add offset for position */
Neighbor = *Buffer; /* get neighbor from matrix */
/* get font index number from lookup table */
Table2 = (uint8_t *)&FontTable; /* start address */
Table2 += Neighbor; /* add offset for character */
Index = pgm_read_byte(Table2); /* get index number */
if (Index == 0xff) return; /* no character bitmap available */
/* calculate start address of character bitmap */
Table2 = (uint8_t *)&FontData; /* start address of font data */
Offset = FONT_BYTES_N * Index; /* offset for character */
Table2 += Offset; /* address of character data */
/*
* display bitmaps of new and neighboring char
*/
/* read character bitmap and send it to display */
y = 1;
Row = Y_Start; /* get start row for screen */
while (y <= FONT_BYTES_Y)
{
LCD_DotPos(X_Start, Row); /* set start position */
/* new char */
Index = pgm_read_byte(Table1); /* read byte */
Table1++; /* address for next byte */
/* neighboring char */