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ILI9341.c
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/* ************************************************************************
*
* driver functions for ILI9341 and ILI9342 compatible
* color graphic displays
* - ILI9341: 240 x 320 pixels
* ILI9342: 320 x 240 pixels
* - interfaces
* - 8 bit parallel in 8080-I and 8080-II mode
* - 9 bit parallel in 8080-I and 8080-II mode (not supported)
* - 16 bit parallel in 8080-I and 8080-II mode (not supported)
* - 18 bit parallel in 8080-I and 8080-II mode (not supported)
* - 4 line SPI
* - 3 line SPI (not supported, requires bit-bang SPI)
*
* (c) 2015-2024 by Markus Reschke
*
* ************************************************************************ */
/*
* hints:
* - pin assignment for SPI
* /RES LCD_RES (optional)
* /CS LCD_CS (optional)
* D/C (WRX) LCD_DC
* SCK (DC/X) LCD_SCK
* SDI LCD_SDI
* SDO LCD_SDO (ILI9341 only, not used yet)
* For hardware SPI LCD_SCK and LCD_SDI have to be the MCU's SCK and
* MOSI pins.
* - max. SPI clock: 10MHz write and 6.6MHz read
* there are reports about 36, 48, and even 78MHz for the write mode
* - pin assignment for 8 bit parallel interface in 8080-I mode
* LCD_PORT/LCD_DDR:
* /RESX LCD_RES (optional)
* /CSX LCD_CS (optional)
* D/CX LCD_DC
* WRX LCD_WR
* RDX LCD_RD (optional)
* LCD_PORT2/LCD_DDR2/LCD_PIN2:
* D0 LCD_DB0 (LCD_PORT2 pin #0)
* D1 LCD_DB1 (LCD_PORT2 pin #1)
* D2 LCD_DB2 (LCD_PORT2 pin #2)
* D3 LCD_DB3 (LCD_PORT2 pin #3)
* D4 LCD_DB4 (LCD_PORT2 pin #4)
* D5 LCD_DB5 (LCD_PORT2 pin #5)
* D6 LCD_DB6 (LCD_PORT2 pin #6)
* D7 LCD_DB7 (LCD_PORT2 pin #7)
* - max. clock rate for parallel bus
* 15MHz write
* 6.25MHz read register data
* 2.2MHz read frame memory
*/
/* local includes */
#include "config.h" /* global configuration */
#ifdef LCD_ILI9341
/*
* 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 "colors.h" /* color definitions */
#include "ILI9341.h" /* ILI9341 specifics */
/* fonts and symbols */
/* horizontally aligned, horizontal bit order flipped */
#include "font_8x8_hf.h"
#include "font_8x16_alt_hf.h"
#include "font_8x16_win1251_hf.h"
#include "font_8x16alt_win1251_hf.h"
#include "font_12x16_hf.h"
#include "font_16x26_hf.h"
#include "font_8x12t_iso8859-2_hf.h"
#include "font_8x16_iso8859-2_hf.h"
#include "font_10x16_iso8859-2_hf.h"
#include "font_12x16_iso8859-2_hf.h"
#include "font_16x26_iso8859-2_hf.h"
#include "font_16x26_win1251_hf.h"
#include "symbols_24x24_hf.h"
#include "symbols_24x24_alt1_hf.h"
#include "symbols_24x24_alt2_hf.h"
#include "symbols_24x24_old_hf.h"
#include "symbols_32x32_hf.h"
#include "symbols_32x32_alt1_hf.h"
#include "symbols_32x32_alt2_hf.h"
#include "symbols_32x32_old_hf.h"
#include "symbols_32x39_hf.h"
/* sanity check */
#ifndef FONT_SET
#error <<< No font selected! >>>
#endif
#ifdef SW_SYMBOLS
#ifndef SYMBOL_SET
#error <<< No symbols selected! >>>
#endif
#endif
/*
* derived constants
*/
/* maximum number of pixels for X and Y direction */
#ifdef LCD_ROTATE
#define LCD_PIXELS_X LCD_DOTS_Y
#define LCD_PIXELS_Y LCD_DOTS_X
#else
#define LCD_PIXELS_X LCD_DOTS_X
#define LCD_PIXELS_Y LCD_DOTS_Y
#endif
/* number of lines and characters per line */
#define LCD_CHAR_X (LCD_PIXELS_X / FONT_SIZE_X)
#define LCD_CHAR_Y (LCD_PIXELS_Y / FONT_SIZE_Y)
/* component symbols */
#ifdef SW_SYMBOLS
/* resize symbols by a factor of 2 */
#define SYMBOL_RESIZE 2
/* size in relation to a character */
#define LCD_SYMBOL_CHAR_X (((SYMBOL_SIZE_X * SYMBOL_RESIZE) + FONT_SIZE_X - 1) / FONT_SIZE_X)
#define LCD_SYMBOL_CHAR_Y (((SYMBOL_SIZE_Y * SYMBOL_RESIZE) + FONT_SIZE_Y - 1) / FONT_SIZE_Y)
/* check y size: we need at least 2 lines */
#if LCD_SYMBOL_CHAR_Y < 2
#error <<< Symbols too small! >>>
#endif
#endif
/*
* local variables
*/
/* address window */
uint16_t X_Start; /* start position X (column) */
uint16_t X_End; /* end position X (column) */
uint16_t Y_Start; /* start position Y (page/row) */
uint16_t Y_End; /* end position Y (page/row) */
/* text line management */
uint16_t LineFlags; /* bitfield for up to 16 lines */
/* ************************************************************************
* low level functions for 4 line SPI interface
* ************************************************************************ */
/*
* protocol:
* - write: CSX -> D/CX -> D7-0 with rising edge of SCL
* - read ILI9341 interface mode I or ILI9342:
* - SDI is also used as SDO
* - MCU has to switch MOSI pin to HiZ during read
* just before falling edge of command's last bit
* - CSX has to stay low for command and read
* - CSX -> send command -> D/CX -> D7-0 with falling edge of SCL
* - read ILI9341 interface mode II:
* - CSX has to stay low for command and read
* - CSX -> send command -> D/CX -> D7-0 with falling edge of SCL
* - D/CX: high = data / low = command
*
* hints:
* - RGB565 and RGB666 are supported when using 4-line SPI
*/
#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
*/
Bits = LCD_DDR; /* get current directions */
/* basic output pins */
Bits |= (1 << LCD_DC); /* D/C */
/* optional output pins */
#ifdef LCD_RES
Bits |= (1 << LCD_RES); /* /RES */
#endif
#ifdef LCD_CS
Bits |= (1 << LCD_CS); /* /CS */
#endif
LCD_DDR = Bits; /* set new directions */
/* set default levels */
#ifdef LCD_CS
/* disable chip */
LCD_PORT |= (1 << LCD_CS); /* set /CS high */
#endif
#ifdef LCD_RES
/* disable reset */
LCD_PORT |= (1 << LCD_RES); /* set /RES high */
#endif
/*
* init SPI bus
* - SPI bus is set up already in main()
*/
#ifdef SPI_HARDWARE
/*
* set SPI clock rate (10MHz worst case)
* - max. MCU clock 20MHz / 2 = 10MHz
* - f_osc/2 (SPR1 = 0, SPR0 = 0, SPI2X = 1)
*/
SPI.ClockRate = SPI_CLOCK_2X; /* set clock rate flags */
SPI_Clock(); /* update SPI clock */
#endif
}
/*
* send a command to the LCD
*
* requires:
* - Cmd: byte value to send
*/
void LCD_Cmd(uint8_t Cmd)
{
/* indicate command mode */
LCD_PORT &= ~(1 << LCD_DC); /* set D/C low */
#ifdef LCD_CS
/* select chip */
LCD_PORT &= ~(1 << LCD_CS); /* set /CS1 low */
#endif
SPI_Write_Byte(Cmd); /* write command byte */
#ifdef LCD_CS
/* deselect chip */
LCD_PORT |= (1 << LCD_CS); /* set /CS1 high */
#endif
}
/*
* send data to the LCD
*
* requires:
* - Data: byte value to send
*/
void LCD_Data(uint8_t Data)
{
/* indicate data mode */
LCD_PORT |= (1 << LCD_DC); /* set D/C high */
#ifdef LCD_CS
/* select chip */
LCD_PORT &= ~(1 << LCD_CS); /* set /CS1 low */
#endif
SPI_Write_Byte(Data); /* write data byte */
#ifdef LCD_CS
/* deselect chip */
LCD_PORT |= (1 << LCD_CS); /* set /CS1 high */
#endif
}
/*
* send data to the LCD
*
* requires:
* - Data: 2-byte value to send
*/
void LCD_Data2(uint16_t Data)
{
uint8_t Byte; /* data byte */
/* indicate data mode */
LCD_PORT |= (1 << LCD_DC); /* set D/C high */
#ifdef LCD_CS
/* select chip */
LCD_PORT &= ~(1 << LCD_CS); /* set /CS1 low */
#endif
Byte = (uint8_t)Data; /* save LSB */
Data >>= 8; /* get MSB */
SPI_Write_Byte((uint8_t)Data); /* write MSB of data */
SPI_Write_Byte(Byte); /* write LSB of data */
#ifdef LCD_CS
/* deselect chip */
LCD_PORT |= (1 << LCD_CS); /* set /CS1 high */
#endif
}
#endif
/* ************************************************************************
* low level functions for 8 bit parallel interface
* - LCD_PORT (LCD_DDR) for control signals
* - LCD_PORT2 (LCD_DDR2/LCD_PIN2) for data signals 0-7
* ************************************************************************ */
/*
* protocol:
* - CSX -> D/CX -> D7-0 with rising edge of WRX
* - D/CX: high = data / low = command
*
* hints:
* - RGB565 and RGB666 are supported when using the 8-bit parallel interface
* - modes:
* 8080-I - uses lower data lines (D7-0)
* 8080-II - user upper data lines (D17-10)
*/
#ifdef LCD_PAR_8
/*
* set up interface bus
* - should be called at firmware startup
*/
void LCD_BusSetup(void)
{
uint8_t Bits; /* register bits */
/*
* set data signals
* - LCD_PORT2
*/
/* all data pins are in output mode by default */
LCD_DDR2 = 0b11111111; /* D0-7 */
/*
* set control signals
* - LCD_PORT
*/
/* set directions */
Bits = LCD_DDR; /* get current directions */
/* basic output pins */
Bits |= (1 << LCD_DC) | (1 << LCD_WR); /* D/CX, WRX */
/* optional output pins */
#ifdef LCD_RD
Bits |= (1 << LCD_RD); /* RDX */
#endif
#ifdef LCD_RES
Bits |= (1 << LCD_RES); /* /RES */
#endif
#ifdef LCD_CS
Bits |= (1 << LCD_CS); /* /CS */
#endif
LCD_DDR = Bits; /* set new directions */
/* set default levels */
Bits = LCD_PORT; /* get current levels */
/* basic output pins */
Bits |= (1 << LCD_WR); /* set WRX high */
/* optional output pins */
#ifdef LCD_RD
Bits |= (1 << LCD_RD); /* set RDX high */
#endif
#ifdef LCD_CS
/* disable chip */
Bits |= (1 << LCD_CS); /* set /CSX high */
#endif
#ifdef LCD_RES
/* disable reset */
Bits |= (1 << LCD_RES); /* set /RESX high */
#endif
LCD_PORT = Bits; /* set new levels */
}
/*
* send a byte (data or command) to the LCD
*
* requires:
* - Byte: byte value to send
*/
void LCD_SendByte(uint8_t Byte)
{
/* set data signals */
LCD_PORT2 = Byte; /* D0-7 */
/* create write strobe (rising edge takes data in) */
LCD_PORT &= ~(1 << LCD_WR); /* set WRX low */
/* wait 15ns */
LCD_PORT |= (1 << LCD_WR); /* set WRX high */
/* data hold time 10ns */
/* next write cycle after 15ns WRX being high */
}
/*
* send a command to the LCD
*
* requires:
* - Cmd: byte value to send
*/
void LCD_Cmd(uint8_t Cmd)
{
#ifdef LCD_CS
/* select chip */
LCD_PORT &= ~(1 << LCD_CS); /* set /CSX low */
#endif
/* indicate command mode */
LCD_PORT &= ~(1 << LCD_DC); /* set D/CX low */
/* send command */
LCD_SendByte(Cmd); /* send command byte */
#ifdef LCD_CS
/* deselect chip */
LCD_PORT |= (1 << LCD_CS); /* set /CSX high */
#endif
}
/*
* send data to the LCD
*
* requires:
* - Data: byte value to send
*/
void LCD_Data(uint8_t Data)
{
#ifdef LCD_CS
/* select chip */
LCD_PORT &= ~(1 << LCD_CS); /* set /CSX low */
#endif
/* indicate data mode */
LCD_PORT |= (1 << LCD_DC); /* set D/CX high */
/* send data */
LCD_SendByte(Data); /* send data byte */
#ifdef LCD_CS
/* deselect chip */
LCD_PORT |= (1 << LCD_CS); /* set /CSX high */
#endif
}
/*
* send data to the LCD
*
* requires:
* - Data: 2-byte value to send
*/
void LCD_Data2(uint16_t Data)
{
uint8_t Byte; /* data byte */
#ifdef LCD_CS
/* select chip */
LCD_PORT &= ~(1 << LCD_CS); /* set /CSX low */
#endif
/* indicate data mode */
LCD_PORT |= (1 << LCD_DC); /* set D/CX high */
/* send data */
Byte = (uint8_t)Data; /* save LSB */
Data >>= 8; /* get MSB */
LCD_SendByte((uint8_t)Data); /* send MSB */
LCD_SendByte(Byte); /* send LSB */
#ifdef LCD_CS
/* deselect chip */
LCD_PORT |= (1 << LCD_CS); /* set /CSX high */
#endif
}
#if 0
/*
* read byte from LCD
* - timing for register data
* - not suitable for frame memory
*
* returns:
* - byte
*/
uint8_t LCD_ReadByte(void)
{
uint8_t Byte; /* return value */
/* set data pins to input mode */
LCD_DDR2 = 0b00000000; /* D0-7 */
#ifdef LCD_CS
/* select chip */
LCD_PORT &= ~(1 << LCD_CD); /* set /CSX low */
#endif
/* indicate data mode */
LCD_PORT |= (1 << LCD_DC); /* set D/CX high */
/* start read cycle (RDX low for min. 45ns) */
LCD_PORT &= ~(1 << LCD_RD); /* set RDX low */
/* wait for LCD to fetch data: max. 40ns */
asm volatile("nop\n\t"::); /* burn a clock cycle */
/* read data */
Byte = LCD_PIN2;
/* end read cycle */
LCD_PORT |= (1 << LCD_RD); /* set RDX high */
/* wait for LCD to release data lines: max. 80ns */
#ifndef LCD_CS
/* burn two clock cycles */
asm volatile(
"nop\n\t"
"nop\n\t"
::
);
#endif
/* next read cycle after 90ns RDX being high */
#ifdef LCD_CS
/* deselect chip */
LCD_PORT |= (1 << LCD_CS); /* set /CSX high */
#endif
/* set data pins back to output mode */
LCD_DDR2 = 0b11111111; /* D0-7 */
return Byte;
}
#endif
#endif
/* ************************************************************************
* high level functions
* ************************************************************************ */
/*
* set address window
* - 0 up to (max - 1)
*/
void LCD_AddressWindow(void)
{
/* X -> column */
LCD_Cmd(CMD_COL_ADDR_SET);
LCD_Data2(X_Start); /* start column */
LCD_Data2(X_End); /* end column */
/* Y -> page */
LCD_Cmd(CMD_PAGE_ADDR_SET);
LCD_Data2(Y_Start); /* start page */
LCD_Data2(Y_End); /* end page */
}
/*
* set LCD character position
*
* requires:
* - x: horizontal position (1-)
* - y: vertical position (1-)
*/
void LCD_CharPos(uint8_t x, uint8_t y)
{
uint16_t Mask = 1;
/* update UI */
UI.CharPos_X = x;
UI.CharPos_Y = y;
y--; /* start at zero */
/* mark text line as used */
if (y < 16) /* prevent overflow */
{
Mask <<= y; /* shift to bit position for line */
LineFlags |= Mask; /* set bit for line */
}
/*
* calculate dot position
* - top left of character
*/
/* horizontal position (column) */
x--; /* columns start at 0 */
Mask = x; /* expand to 16 bit */
Mask *= FONT_SIZE_X; /* offset for character */
X_Start = Mask; /* update start position */
/* vertical position (page) */
Mask = y; /* expand to 16 bit */
Mask *= FONT_SIZE_Y; /* offset for character */
Y_Start = Mask; /* update start position */
}
/*
* 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)
{
uint16_t x; /* x position */
uint8_t y; /* y position */
uint8_t Pos = 1; /* character position */
wdt_reset(); /* reset watchdog */
if (Line == 0) /* special case: rest of current line */
{
Line = UI.CharPos_Y; /* get current line */
Pos = UI.CharPos_X; /* get current character position */
}
/* text line optimization */
if (Line <= 16) /* prevent overflow */
{
y = Line - 1; /* bitfield starts at zero */
x = 1; /* set start bit */
x <<= y; /* bit for this line */
if (! (LineFlags & x)) /* bit not set */
{
/* empty text line, already cleared */
return; /* nothing do to */
}
else if (Pos == 1) /* bit set and complete line */
{
/* we'll clear this line completely */
LineFlags &= ~x; /* clear bit */
}
}
/* manage address window */
LCD_CharPos(Pos, Line); /* update character position */
/* also updates X_Start and Y_Start */
X_End = LCD_PIXELS_X - 1; /* last column */
Y_End = Y_Start + FONT_SIZE_Y - 1; /* last row */
y = FONT_SIZE_Y; /* set default */
/* partial text line at bottom of display */
if (Y_End > (LCD_PIXELS_Y - 1)) /* row overflow */
{
x = Y_End - (LCD_PIXELS_Y - 1); /* difference */
y -= (uint8_t)x; /* adjust number of rows */
Y_End = LCD_PIXELS_Y - 1; /* set last row */
}
LCD_AddressWindow(); /* set window */
/* clear all pixels in window */
LCD_Cmd(CMD_MEM_WRITE); /* start writing */
while (y > 0) /* character height (pages) */
{
x = X_Start; /* reset start position */
while (x < LCD_PIXELS_X) /* all columns */
{
/* send background color */
LCD_Data2(COLOR_BACKGROUND);
x++; /* next column */
}
y--; /* next page */
}
}
/*
* clear the display
*/
void LCD_Clear(void)
{
uint8_t n = 1; /* counter */
/* we have to clear all dots manually :-( */
while (n <= (LCD_CHAR_Y + 1)) /* for all text lines */
{
/* +1 is for a possible partial line at the bottom */
LCD_ClearLine(n); /* clear line */
n++; /* next line */
}
LCD_CharPos(1, 1); /* reset character position */
}
/*
* initialize LCD
*/
void LCD_Init(void)
{
uint8_t Bits;
/* hardware reset */
#ifdef LCD_RES
LCD_PORT &= ~(1 << LCD_RES); /* set /RES low */
wait10us(); /* wait 10µs */
LCD_PORT |= (1 << LCD_RES); /* set /RES high */
/* blanking sequence needs up to 120ms */
/* but we may send command after 5ms */
MilliSleep(5); /* wait 5ms */
#endif
/*
* set registers
*/
#ifndef LCD_EXT_CMD_OFF
/* power control A */
LCD_Cmd(CMD_POWER_CTRL_A);
LCD_Data(MASK_POWER_CTRL_A_1); /* fixed value */
LCD_Data(MASK_POWER_CTRL_A_2); /* fixed value */
LCD_Data(MASK_POWER_CTRL_A_3); /* fixed value */
LCD_Data(MASK_POWER_CTRL_A_4 | FLAG_REG_VD_160); /* Vcore 1.6V */
LCD_Data(FLAG_VBC_56); /* DDVDH 5.6V */
/* power control B */
LCD_Cmd(CMD_POWER_CTRL_B);
LCD_Data(MASK_POWER_CTRL_B_1); /* fixed value */
LCD_Data(MASK_POWER_CTRL_B_2 | FLAG_POWER_CTRL_B);
LCD_Data(MASK_POWER_CTRL_B_3 | FLAG_DC_ON); /* ESD protection on */
/* pump ratio control */
LCD_Cmd(CMD_PUMP_RATIO_CTRL);
LCD_Data(FLAG_PUMP_RATIO_2); /* 2xVCI */
/* power control 1 */
LCD_Cmd(CMD_POWER_CTRL_1);
LCD_Data(FLAG_VRH_460); /* GVDD 4.60V */
/* power control 2 */
LCD_Cmd(CMD_POWER_CTRL_2);
LCD_Data(FLAG_BT_3); /* DDVDH=2*VCI, VGH=6xVCI, VGL=-3*VCI */
/* VCOM control 1 */
LCD_Cmd(CMD_VCOM_CTRL_1);
LCD_Data(FLAG_VMH_5000); /* 5.000V, could be used to adjust contrast */
LCD_Data(FLAG_VML_0600); /* -0.600V */
/* VCOM control 2 */
LCD_Cmd(CMD_VCOM_CTRL_2);
LCD_Data(FLAG_VMF_M44 | FLAG_NVM_1); /* -44 */
/* driver timing control A */
LCD_Cmd(CMD_TIME_CTRL_A);
LCD_Data(MASK_TIME_CTRL_A_1 | FLAG_NOW_1); /* default + 1 unit */
LCD_Data(FLAG_CR_1); /* default CR timing */
LCD_Data(MASK_TIME_CTRL_A_3 | FLAG_PC_0); /* default - 2 units */
/* driver timing control B */
LCD_Cmd(CMD_TIME_CTRL_B);
LCD_Data(FLAG_VG_SW_T1_0 | FLAG_VG_SW_T2_0 | FLAG_VG_SW_T3_0 | FLAG_VG_SW_T4_0);
LCD_Data(MASK_TIME_CTRL_B_2); /* fixed value */
#endif
/* set pixel format for RGB image data */
LCD_Cmd(CMD_SET_PIX_FORMAT);
LCD_Data(FLAG_DBI_16); /* 16 Bits / RGB565 */
#ifndef LCD_EXT_CMD_OFF
/* frame control for normal display mode */
LCD_Cmd(CMD_FRAME_CTRL_NORM);
LCD_Data(FLAG_DIVA_1); /* f_OSC */
LCD_Data(FLAG_RTNA_24); /* 24 clocks */
#endif
/* display function control */
LCD_Cmd(CMD_FUNC_CTRL);
LCD_Data(FLAG_PT_0); /* V63 / V0 - VCOML / VCOMH */
LCD_Data(FLAG_REV_1 | FLAG_ISC_01); /* white, 1 frame */
LCD_Data(FLAG_NL_320); /* 320 lines */
LCD_Data(0x00); /* DOTCLK / 2 */
#if 0
/* gamma set */
LCD_Cmd(CMD_GAMMA_SET);
LCD_Data(FLAG_GC_1); /* gamma curve 1 */
#endif
/* memory access control */
LCD_Cmd(CMD_MEM_CTRL);
#ifdef LCD_BGR
/* reverse red and blue color channels */
Bits = FLAG_COLOR_BGR; /* color bit order: BGR */
#else
Bits = FLAG_COLOR_RGB; /* color bit order: RGB */
#endif
#ifdef LCD_ROTATE
Bits |= FLAG_XY_REV; /* swap x and y */
#endif
#ifdef LCD_FLIP_X
Bits |= FLAG_COL_REV; /* flip x */
#endif
#ifdef LCD_FLIP_Y
Bits |= FLAG_PAGE_REV; /* flip y */
#endif
LCD_Data(Bits);
/* address window */
X_Start = 0;
X_End = LCD_PIXELS_X - 1;
Y_Start = 0;
Y_End = LCD_PIXELS_Y - 1;
LCD_AddressWindow(); /* set address window */
/* power on */
MilliSleep(120); /* pause for 120ms */
LCD_Cmd(CMD_SLEEP_OUT); /* exit sleep mode */
MilliSleep(60); /* pause for 60ms */
LCD_Cmd(CMD_DISPLAY_ON); /* enable display output */
MilliSleep(80); /* pause for 80ms */
/* 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
/* init character stuff */
LineFlags = 0xffff; /* clear all lines by default */
LCD_CharPos(1, 1); /* reset character position */
#if defined (LCD_SPI) && defined (SPI_HARDWARE)
/* For bit-bang SPI we don't clear the display now, because it's quite slow */
LCD_Clear();
#endif
#if defined (LCD_PAR_8)
LCD_Clear();
#endif
}
/*
* display a single character
*
* requires:
* - Char: character to display
*/
void LCD_Char(unsigned char Char)
{
uint8_t *Table; /* pointer to table */
uint8_t Index; /* font index */
uint16_t Offset; /* address offset */
uint8_t Pixels; /* pixels in y direction */
uint8_t x; /* bitmap x byte counter */
uint8_t y = 1; /* bitmap y byte counter */
uint8_t Bits; /* number of bits to be sent */
uint8_t n; /* bitmap bit counter */
/* prevent x overflow */
if (UI.CharPos_X > LCD_CHAR_X) return;
/* get font index number from lookup table */
Table = (uint8_t *)&FontTable; /* start address */
Table += Char; /* add offset for character */
Index = pgm_read_byte(Table); /* get index number */
if (Index == 0xff) return; /* no character bitmap available */
/* calculate start address of character bitmap */
Table = (uint8_t *)&FontData; /* start address of font data */
Offset = FONT_BYTES_N * Index; /* offset for character */
Table += Offset; /* address of character data */
/* LCD's address window */
LCD_CharPos(UI.CharPos_X, UI.CharPos_Y); /* update character position */
/* also updates X_Start and Y_Start */
X_End = X_Start + FONT_SIZE_X - 1; /* offset for end */
Y_End = Y_Start + FONT_SIZE_Y - 1; /* offset for end */
LCD_AddressWindow(); /* set address window */
#ifdef LCD_COLOR
/* color feature enabled */
Offset = UI.PenColor; /* get pen color */
#else
/* color feature disabled */
Offset = COLOR_PEN; /* use default pen color */
#endif
LCD_Cmd(CMD_MEM_WRITE); /* start writing */
/* read character bitmap and send it to display */
while (y <= FONT_BYTES_Y)
{
Pixels = FONT_SIZE_X; /* track x bits to be sent */
x = 1; /* reset counter */
/* read and send all bytes for this row */
while (x <= FONT_BYTES_X)
{
/* track x bits */
if (Pixels >= 8) /* a byte or more left */
{
Bits = 8; /* send full byte */
}
else /* less than a byte left */
{
Bits = Pixels; /* send remaining bits */
}
Pixels -= Bits; /* update counter */