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RD_Display.c
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RD_Display.c
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/* ************************************************************************
*
* driver functions for R&D Display
* - for identifying display controllers
* - x * y pixels
* - interfaces
* - 8 bit parallel in 8080 mode
* - 8 bit parallel in 6800 mode (untested)
* - 4 line SPI (untested)
*
* (c) 2020-2021 by Markus Reschke
*
* ************************************************************************ */
/*
* hints:
* - pin assignment for SPI
* /RES LCD_RES (optional)
* /CS LCD_CS (optional)
* D/C LCD_DC
* SCK LCD_SCK
* SDI LCD_SDI
* SDO LCD_SDO
* For hardware SPI LCD_SCK, LCD_SDI and LCD_SDO have to be the MCU's
* SCK, MOSI and MISO pins.
* - max. SPI clock: 10MHz write and 6.6MHz read
* - pin assignment for 8 bit parallel interface in 8080 mode
* LCD_PORT/LCD_DDR:
* /RES LCD_RES (optional)
* /CS LCD_CS (optional)
* D/C LCD_DC
* WR LCD_WR
* RD LCD_RD (optional)
* LCD_PORT2/LCD_DDR2/LCD_PIN2:
* DB0 LCD_DB0 (LCD_PORT2 pin #0)
* DB1 LCD_DB1 (LCD_PORT2 pin #1)
* DB2 LCD_DB2 (LCD_PORT2 pin #2)
* DB3 LCD_DB3 (LCD_PORT2 pin #3)
* DB4 LCD_DB4 (LCD_PORT2 pin #4)
* DB5 LCD_DB5 (LCD_PORT2 pin #5)
* DB6 LCD_DB6 (LCD_PORT2 pin #6)
* DB7 LCD_DB7 (LCD_PORT2 pin #7)
* - max. clock rate for parallel bus
* 15MHz write
* 6.25MHz read register data
* 2.2MHz read frame memory
* - pin assignment for 8 bit parallel interface in 6800 mode
* LCD_PORT/LCD_DDR:
* /RES LCD_RES (optional)
* /CS LCD_CS (optional)
* D/C LCD_DC
* R/W LCD_RW
* E LCD_E
* LCD_PORT2/LCD_DDR2/LCD_PIN2:
* DB0 LCD_DB0 (LCD_PORT2 pin #0)
* DB1 LCD_DB1 (LCD_PORT2 pin #1)
* DB2 LCD_DB2 (LCD_PORT2 pin #2)
* DB3 LCD_DB3 (LCD_PORT2 pin #3)
* DB4 LCD_DB4 (LCD_PORT2 pin #4)
* DB5 LCD_DB5 (LCD_PORT2 pin #5)
* DB6 LCD_DB6 (LCD_PORT2 pin #6)
* DB7 LCD_DB7 (LCD_PORT2 pin #7)
*/
/* local includes */
#include "config.h" /* global configuration */
#ifdef LCD_RD_DISPLAY
/*
* 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 */
/* fonts and symbols */
/* horizontally aligned, horizontal bit order flipped */
#include "font_8x8_hf.h"
#include "font_12x16_hf.h"
#include "font_16x26_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_32x32_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
#define LCD_CHAR_X 16
#define LCD_CHAR_Y 8
/* 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_RESIZE
#define LCD_SYMBOL_CHAR_Y SYMBOL_RESIZE
#endif
/*
* local constants
*/
/* command mode (bitfield) */
#define CMD_MODE_8 0b00000001 /* 8 bits */
#define CMD_MODE_16 0b00000010 /* 16 bits */
/* control line management (bitfield) */
/* chip select: /CS */
#define DISP_SELECT 0b00000001 /* select controller */
#define DISP_DESELECT 0b00000010 /* deselect controller */
/* read/write mode and data line direction */
#define DISP_READ 0b00000100 /* read mode / lines: input */
#define DISP_WRITE 0b00001000 /* write mode / lines: output */
/*
* local variables
*/
/* command mode (bitfield) */
uint8_t CmdMode; /* 8 or 16 bits */
/* 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:
* - CSX -> D/CX -> D7-0 with rising edge of SCL
* - D/CX: high = data / low = command
*/
#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
}
/*
* manage control lines
*
* requires:
* - Mode: control flags (bitfield)
* DISP_SELECT select controller
* DISP_DESELECT deselect controller
* DISP_WRITE write mode
* DISP_READ read mode
*/
void LCD_Control(uint8_t Mode)
{
/*
* We can ignore DISP_WRITE and DISP_READ because SPI uses two separate
* lines for reading and writing.
*/
#ifdef LCD_CS
if (Mode & DISP_SELECT) /* select controller */
{
/* select chip */
LCD_PORT &= ~(1 << LCD_CS); /* set /CS low */
}
else if (Mode & DISP_DESELECT) /* deselect controller */
{
/* select chip */
LCD_PORT |= (1 << LCD_CS); /* set /CS high */
}
#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 */
SPI_Write_Byte(Cmd); /* write command byte */
}
/*
* 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 */
SPI_Write_Byte(Data); /* write data byte */
}
/*
* 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 */
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_READ
/*
* read byte from display
*
* returns:
* - byte
*/
uint8_t LCD_ReadByte(void)
{
uint8_t Byte; /* return value */
Byte = SPI_WriteRead_Byte(0); /* send dummy byte and read byte */
return Byte;
}
#endif
#endif
/* ************************************************************************
* low level functions for 8 bit parallel interface in 8080 mode
* - LCD_PORT (LCD_DDR) for control signals
* - LCD_PORT2 (LCD_DDR2/LCD_PIN2) for data signals 0-7
* ************************************************************************ */
/*
* protocol:
* - write: CS low -> D/C -> WR low to init write -> set D7-0 ->
* rising edge of WR triggers read
* - read: CS low -> D/C -> RD low to trigger output ->
* read D7-0 with rising edge of RD
* - D/C: high = data / low = command
* - commands may have to be sent as 2 bytes for some controllers
*/
#ifdef LCD_PAR_8_8080
/*
* 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; /* DB0-7 */
/*
* set control signals
* - LCD_PORT
*/
/* set directions */
Bits = LCD_DDR; /* get current directions */
/* basic output pins */
Bits |= (1 << LCD_DC) | (1 << LCD_WR); /* D/C, WR */
/* optional output pins */
#ifdef LCD_RD
Bits |= (1 << LCD_RD); /* RD */
#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 RD high */
#endif
#ifdef LCD_CS
/* disable chip */
Bits |= (1 << LCD_CS); /* set /CS high */
#endif
#ifdef LCD_RES
/* disable reset */
Bits |= (1 << LCD_RES); /* set /RES high */
#endif
LCD_PORT = Bits; /* set new levels */
}
/*
* manage control lines
*
* requires:
* - Mode: control flags (bitfield)
* DISP_SELECT select controller
* DISP_DESELECT deselect controller
* DISP_WRITE write mode
* DISP_READ read mode
*/
void LCD_Control(uint8_t Mode)
{
#ifdef LCD_READ
if (Mode & DISP_WRITE) /* start writing / end reading */
{
/* set data pins to output mode before writing */
LCD_DDR2 = 0b11111111; /* DB0-7 */
}
else if (Mode & DISP_READ) /* start reading / end writing */
{
/* set data pins to input mode before reading */
LCD_DDR2 = 0b00000000; /* DB0-7 */
}
#endif
#ifdef LCD_CS
if (Mode & DISP_SELECT) /* select controller */
{
/* select chip */
LCD_PORT &= ~(1 << LCD_CS); /* set /CS low */
}
else if (Mode & DISP_DESELECT) /* deselect controller */
{
/* select chip */
LCD_PORT |= (1 << LCD_CS); /* set /CS high */
}
#endif
}
/*
* send a byte (data or command) to the display
*
* requires:
* - Byte: byte value to send
*/
void LCD_SendByte(uint8_t Byte)
{
/* set data signals */
LCD_PORT2 = Byte; /* DB0-7 */
/* create write strobe (rising edge takes data in) */
LCD_PORT &= ~(1 << LCD_WR); /* set WR low */
/* wait 15ns */
LCD_PORT |= (1 << LCD_WR); /* set WR high */
/* data hold time 10ns */
/* next write cycle after 15ns WR being high */
}
/*
* send a command to the display
*
* requires:
* - Cmd: byte value to send
*/
void LCD_Cmd(uint8_t Cmd)
{
/* indicate command mode */
LCD_PORT &= ~(1 << LCD_DC); /* set D/C low */
if (CmdMode & CMD_MODE_8) /* 8 bit command */
{
/* send command: 1 byte */
LCD_SendByte(Cmd); /* send command byte */
}
else if (CmdMode & CMD_MODE_16) /* 16 bit command */
{
/* send command: 2 bytes */
LCD_SendByte(0); /* send dummy MSB */
LCD_SendByte(Cmd); /* send command byte as LSB */
}
}
/*
* send data to the display
*
* requires:
* - Data: byte value to send
*/
void LCD_Data(uint8_t Data)
{
/* indicate data mode */
LCD_PORT |= (1 << LCD_DC); /* set D/C high */
/* send data */
LCD_SendByte(Data); /* send data byte */
}
/*
* send data to the display
*
* 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 */
/* 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_READ
/*
* read byte from display
* - timing for register data
* - not suitable for frame memory
*
* returns:
* - byte
*/
uint8_t LCD_ReadByte(void)
{
uint8_t Byte; /* return value */
/* indicate data mode */
LCD_PORT |= (1 << LCD_DC); /* set D/C high */
/* start read cycle (RD low for min. 45ns) */
LCD_PORT &= ~(1 << LCD_RD); /* set RD low */
/* wait for display to fetch data: max. 40ns */
/* but we wait a little be longer, just in case (min. 150ns) */
asm volatile(
"nop\n\t"
"nop\n\t"
"nop\n\t"
::
);
/* read data: DB0-7 */
Byte = LCD_PIN2;
/* end read cycle */
LCD_PORT |= (1 << LCD_RD); /* set RD high */
/* wait for display 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 RD being high */
return Byte;
}
#endif
#endif
/* ************************************************************************
* low level functions for 8 bit parallel interface in 6800 mode
* - LCD_PORT (LCD_DDR) for control signals
* - LCD_PORT2 (LCD_DDR2/LCD_PIN2) for data signals 0-7
* ************************************************************************ */
/*
* protocol:
* - write: CS low -> D/C -> R/W low -> E high -> set D7-0 ->
* falling edge of E triggers read
* - read: CS low -> D/C -> R/W high -> E high ->
* read D7-0 with falling edge of E
* - D/C: high = data / low = command
* - commands may have to be sent as 2 bytes for some controllers
*/
#ifdef LCD_PAR_8_6800
/*
* 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; /* DB0-7 */
/*
* set control signals
* - LCD_PORT
*/
/* set directions */
Bits = LCD_DDR; /* get current directions */
/* basic output pins */
Bits |= (1 << LCD_DC) | (1 << LCD_RW) | (1 << LCD_E); /* D/C, R/W, E */
/* 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 */
Bits = LCD_PORT; /* get current levels */
/* basic output pins */
Bits &= ~(1 << LCD_E); /* set E low */
/* optional output pins */
#ifdef LCD_CS
/* disable chip */
Bits |= (1 << LCD_CS); /* set /CS high */
#endif
#ifdef LCD_RES
/* disable reset */
Bits |= (1 << LCD_RES); /* set /RES high */
#endif
LCD_PORT = Bits; /* set new levels */
}
/*
* manage control lines
*
* requires:
* - Mode: control flags (bitfield)
* DISP_SELECT select controller
* DISP_DESELECT deselect controller
* DISP_WRITE write mode
* DISP_READ read mode
*/
void LCD_Control(uint8_t Mode)
{
#ifdef LCD_READ
if (Mode & DISP_WRITE) /* start writing / end reading */
{
/* set data pins to output mode before writing */
LCD_DDR2 = 0b11111111; /* DB0-7 */
}
else if (Mode & DISP_READ) /* start reading / end writing */
{
/* set data pins to input mode before reading */
LCD_DDR2 = 0b00000000; /* DB0-7 */
}
#endif
#ifdef LCD_CS
if (Mode & DISP_SELECT) /* select controller */
{
/* select chip */
LCD_PORT &= ~(1 << LCD_CS); /* set /CS low */
}
else if (Mode & DISP_DESELECT) /* deselect controller */
{
/* select chip */
LCD_PORT |= (1 << LCD_CS); /* set /CS high */
}
#endif
}
/*
* send a byte (data or command) to the display
*
* requires:
* - Byte: byte value to send
*/
void LCD_SendByte(uint8_t Byte)
{
/* claim bus */
LCD_PORT |= (1 << LCD_E); /* set E high */
/* set data signals */
LCD_PORT2 = Byte; /* DB0-7 */
/* trigger read (falling edge takes data in) */
LCD_PORT &= ~(1 << LCD_E); /* set E low */
/* data hold time 10ns */
/* next write cycle after 15ns E being low */
}
/*
* send a command to the display
*
* requires:
* - Cmd: byte value to send
*/
void LCD_Cmd(uint8_t Cmd)
{
/* indicate command mode */
LCD_PORT &= ~(1 << LCD_DC); /* set D/C low */
if (CmdMode & CMD_MODE_8) /* 8 bit command */
{
/* send command: 1 byte */
LCD_SendByte(Cmd); /* send command byte */
}
else if (CmdMode & CMD_MODE_16) /* 16 bit command */
{
/* send command: 2 bytes */
LCD_SendByte(0); /* send dummy MSB */
LCD_SendByte(Cmd); /* send command byte as LSB */
}
}
/*
* send data to the display
*
* requires:
* - Data: byte value to send
*/
void LCD_Data(uint8_t Data)
{
/* indicate data mode */
LCD_PORT |= (1 << LCD_DC); /* set D/C high */
/* send data */
LCD_SendByte(Data); /* send data byte */
}
/*
* send data to the display
*
* 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 */
/* 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_READ
/*
* read byte from display
* - timing for register data
* - not suitable for frame memory
*
* returns:
* - byte
*/
uint8_t LCD_ReadByte(void)
{
uint8_t Byte; /* return value */
/* indicate data mode */
LCD_PORT |= (1 << LCD_DC); /* set D/C high */
/* start read cycle */
LCD_PORT |= (1 << LCD_E); /* set E high */
/* wait for display to fetch data: min. 90ns */
/* but we wait a little be longer, just in case (min. 150ns) */
asm volatile(
"nop\n\t"
"nop\n\t"
"nop\n\t"
::
);
/* read data: DB0-7 */
Byte = LCD_PIN2;
/* end read cycle */
LCD_PORT &= ~(1 << LCD_E); /* set E low */
/* wait for display to release data lines: max. 80ns */
#ifndef LCD_CS
/* burn two clock cycles */
asm volatile(
"nop\n\t"
"nop\n\t"
::
);
#endif
return Byte;
}
#endif
#endif
/* ************************************************************************
* debugging support
* ************************************************************************ */
#ifdef SW_DISPLAY_ID
/*
* try to read ID of display controller
* - sets Cfg.DisplayID: ID (hex)
*/
void Display_ID(void)
{
uint16_t ID; /* controller ID */
uint8_t Flag = 0; /* control flag */
/*
* We try different "Read ID" commands to detect the display controller.
* And we'll keep non-empty data/ID if no controller is identified.
*
* Do some controllers not support /CS pauses?
*/
/*
* Command 0x00 #1
* - ILI9325, ILI9328, LGDP4535, S6D0154, SPFD5408A,
* ST7781?, ST7783, UC8230
*/
// if (Flag == 0)
{
Flag = 1; /* reset flag */
LCD_Control(DISP_SELECT | DISP_WRITE);
LCD_Cmd(0x00); /* command: read ID */
/* read 2 bytes */
LCD_Control(DISP_READ);
ID = LCD_ReadByte(); /* byte #1: MSB */
ID <<= 8; /* shift to MSB */
ID |= LCD_ReadByte(); /* byte #2: LSB */
LCD_Control(DISP_DESELECT);
switch (ID) /* check data */
{
case 0x0000: /* no ID */
Flag = 0; /* none detected */
break;
case 0x9325: /* ILI9325 */
break;
case 0x9328: /* ILI9328 */
break;
case 0x4535: /* LGDP4535 */
break;
case 0x0154: /* S6D0154 */
break;
case 0x5408: /* SPFD5408A */
break;
case 0x7783: /* ST7783 */
break;
case 0x8230: /* UC8230 */
break;
default: /* default */
Cfg.DisplayID = ID; /* save unknown ID */
Flag = 0; /* none detected */
break;
}
}
#if 0
/*