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SH1106.c
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/* ************************************************************************
*
* driver functions for SH1106 compatible OLED grafic displays
* - 128 x 64 (132 x 64) pixels
* - interfaces
* - 8 bit parallel in 6800 mode (not supported)
* - 8 bit parallel in 8080 mode (not supported)
* - 4 line SPI (untested)
* - 3 line SPI (untested)
* - I2C
*
* (c) 2020-2022 by Markus Reschke
*
* ************************************************************************ */
/*
* hints:
* - pin assignment for 4 line SPI
* /CS Gnd or LCD_CS (optional)
* /RES Vcc or LCD_RESET (optional)
* A0 LCD_A0
* SCL (D0) LCD_SCL / SPI_SCK
* SI (D1) LCD_SI / SPI_MOSI
* For hardware SPI LCD_SCL and LCD_SI have to be the MCU's SCK and
* MOSI pins.
* - pin assignment for 3 line SPI
* /CS Gnd or LCD_CS (optional)
* /RES Vcc or LCD_RESET (optional)
* A0 Gnd
* SCL (D0) LCD_SCL / SPI_SCK
* SI (D1) LCD_SI / SPI_MOSI
* Bit-bang mode only!
* - max. SPI clock rate: 4MHz (V_DD1 > 2.4V)
* - pin assignment for I2C
* /RES Vcc or LCD_RESET (optional)
* /CS Gnd
* SA0 (A0) slave address SA0 (Gnd for 0x3c / 3.3V for 0x3d)
* SCL (D0) I2C_SCL
* SDA (D1) I2C_SDA
* - max. I2C clock rate: 400kHz (fast mode)
* - max. clock rate for parallel bus: 3.3MHz (V_DD1 > 2.4V)
*/
/* local includes */
#include "config.h" /* global configuration */
#ifdef LCD_SH1106
/*
* 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 "SH1106.h" /* SH1106 specifics */
/* fonts and symbols */
/* vertically aligned, vertical bit order flipped, bank-wise grouping */
#include "font_6x8_vf.h"
#include "font_8x8_vf.h"
#include "font_8x16_vfp.h"
#include "font_6x8_iso8859-2_vf.h"
#include "font_8x8_iso8859-2_vf.h"
#include "font_8x12t_iso8859-2_vfp.h"
#include "font_8x16_iso8859-2_vfp.h"
#include "font_8x8_win1251_vf.h"
#include "font_8x8alt_win1251_vf.h"
#include "font_8x8t_win1251_vf.h"
#include "font_8x12t_win1251_vfp.h"
#include "font_8x16_win1251_vfp.h"
#include "symbols_24x24_vfp.h"
#include "symbols_24x24_alt1_vfp.h"
#include "symbols_24x24_alt2_vfp.h"
#include "symbols_24x24_old_vfp.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
*/
/* pages/bytes required for character's height */
#define CHAR_PAGES ((FONT_SIZE_Y + 7) / 8)
/* number of lines and characters per line */
#define LCD_CHAR_X (LCD_DOTS_X / FONT_SIZE_X)
#define LCD_CHAR_Y ((LCD_DOTS_Y / 8) / CHAR_PAGES)
/* component symbols */
#ifdef SW_SYMBOLS
/* pages/bytes required for symbol's height */
#define SYMBOL_PAGES ((SYMBOL_SIZE_Y + 7) / 8)
/* 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 + CHAR_PAGES * 8 - 1) / (CHAR_PAGES * 8))
/* check y size: we need at least 2 lines */
#if LCD_SYMBOL_CHAR_Y < 2
#error <<< Symbols too small! >>>
#endif
#endif
/*
* local variables
*/
/* position management */
uint8_t X_Start; /* start position X (column) */
uint8_t Y_Start; /* start position Y (page) */
/* ************************************************************************
* low level functions for 4 wire SPI interface
* ************************************************************************ */
/*
* protocol:
* - /CS -> A0 -> D7-0 with rising edge of SCLK
* - A0: high = data / low = command
*/
#if defined (LCD_SPI) && ! defined (SPI_9)
/*
* 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 */
/* basic output pins */
Bits |= (1 << LCD_A0); /* A0 */
/* optional output pins */
#ifdef LCD_RESET
Bits |= (1 << LCD_RESET); /* /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_RESET
/* disable reset */
LCD_PORT |= (1 << LCD_RESET); /* set /RES high */
#endif
/*
* init SPI bus
* - SPI bus is set up already in main()
*/
#ifdef SPI_HARDWARE
/*
* set SPI clock rate (max. 4MHz)
*/
/* 1MHz -> f_osc/2 (SPR1 = 0, SPR0 = 0, SPI2X = 1) */
#if CPU_FREQ / 1000000 == 1
SPI.ClockRate = SPI_CLOCK_2X;
#endif
/* 8MHz -> f_osc/2 (SPR1 = 0, SPR0 = 0, SPI2X = 1) */
#if CPU_FREQ / 1000000 == 8
SPI.ClockRate = SPI_CLOCK_2X;
#endif
/* 16MHz -> f_osc/4 (SPR1 = 0, SPR0 = 0, SPI2X = 0) */
#if CPU_FREQ / 1000000 == 16
SPI.ClockRate = 0;
#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 command to the LCD
*
* requires:
* - byte value to send
*/
void LCD_Cmd(uint8_t Cmd)
{
/* indicate command mode */
LCD_PORT &= ~(1 << LCD_A0); /* set A0 low */
/* select chip, if pin available */
#ifdef LCD_CS
LCD_PORT &= ~(1 << LCD_CS); /* set /CS low */
#endif
SPI_Write_Byte(Cmd); /* write command byte */
/* deselect chip, if pin available */
#ifdef LCD_CS
LCD_PORT |= (1 << LCD_CS); /* set /CS high */
#endif
}
/*
* send data to the LCD
*
* requires:
* - byte value to send
*/
void LCD_Data(uint8_t Data)
{
/* indicate data mode */
LCD_PORT |= (1 << LCD_A0); /* set A0 high */
/* select chip, if pin available */
#ifdef LCD_CS
LCD_PORT &= ~(1 << LCD_CS); /* set /CS low */
#endif
SPI_Write_Byte(Data); /* write data byte */
/* deselect chip, if pin available */
#ifdef LCD_CS
LCD_PORT |= (1 << LCD_CS); /* set /CS high */
#endif
}
#endif
/* ************************************************************************
* low level functions for 3 wire SPI interface
* ************************************************************************ */
/*
* The 3 wire SPI interface ignores the D/C line and adds a D/C control
* bit to the SPI data resulting in a 9 bit frame:
* - first bit for D/C, followed by D7 to D0
* - bitbang SPI only since the MCU's hardware SPI supports just bytes
*/
#if defined (LCD_SPI) && defined (SPI_BITBANG) && defined (SPI_9)
/*
* 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); /* /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_RESET
/* disable reset */
LCD_PORT |= (1 << LCD_RESET); /* set /RES high */
#endif
/*
* init SPI bus
* - SPI bus is set up already in main()
*/
}
/*
* send a command to the LCD
*
* requires:
* - byte value to send
*/
void LCD_Cmd(uint8_t Cmd)
{
/* select chip, if pin available */
#ifdef LCD_CS
LCD_PORT &= ~(1 << LCD_CS); /* set /CS low */
#endif
SPI_Write_Bit(0); /* indicate command (D/C=0) */
SPI_Write_Byte(Cmd); /* write command byte */
/* deselect chip, if pin available */
#ifdef LCD_CS
LCD_PORT |= (1 << LCD_CS); /* set /CS high */
#endif
}
/*
* send data to the LCD
*
* requires:
* - byte value to send
*/
void LCD_Data(uint8_t Data)
{
/* select chip, if pin available */
#ifdef LCD_CS
LCD_PORT &= ~(1 << LCD_CS); /* set /CS low */
#endif
SPI_Write_Bit(1); /* indicate data (D/C=1) */
SPI_Write_Byte(Data); /* write data byte */
/* deselect chip, if pin available */
#ifdef LCD_CS
LCD_PORT |= (1 << LCD_CS); /* set /CS high */
#endif
}
#endif
/* ************************************************************************
* low level functions for I2C interface
* ************************************************************************ */
#ifdef LCD_I2C
/*
* local constants
*/
/* transfer mode */
#define CTRL_CMD 0b00000001 /* command */
#define CTRL_DATA 0b00000010 /* data */
#define CTRL_SINGLE 0b00000100 /* single byte */
#define CTRL_MULTI 0b00001000 /* multiple bytes */
/*
* local variables
*/
/* single/multi byte control */
uint8_t MultiByte; /* control flag */
/*
* set up interface bus
* - should be called at firmware startup
*/
void LCD_BusSetup(void)
{
/* I2C is set up already in main() */
/* optional control lines */
#ifdef LCD_RESET
/* set pin to output mode */
LCD_DDR |= (1 << LCD_RESET); /* /RES */
/* disable reset */
LCD_PORT |= (1 << LCD_RESET); /* set /RES high */
#endif
/* set timing */
I2C.Timeout = 1; /* ACK timeout 10µs */
/* init control flag */
MultiByte = 0; /* single byte mode */
}
/*
* start sending I2C data
* - set up I2C transfer
* - send control byte
* - manage single/multi byte mode
*
* requires:
* - Mode:
* CTRL_CMD command
* CTRL_DATA data
* CTRL_SINGLE single byte
* CTRL_MULTI multiple bytes
*/
void LCD_StartTransfer(uint8_t Mode)
{
uint8_t Byte; /* control byte */
/* update control flag */
if (Mode & CTRL_MULTI) /* multi byte mode */
{
MultiByte = 1; /* set flag */
}
/* init control byte */
Byte = LCD_CONTROL_BYTE;
if (Mode & CTRL_SINGLE) Byte |= FLAG_CTRL_SINGLE; /* single byte mode */
if (Mode & CTRL_DATA) Byte |= FLAG_CTRL_DATA; /* data mode */
/* flags for multi byte mode and command mode are 0 */
if (I2C_Start(I2C_START) == I2C_OK) /* start */
{
I2C.Byte = LCD_I2C_ADDR << 1; /* address (7 bit & write) */
if (I2C_WriteByte(I2C_ADDRESS) == I2C_ACK) /* address slave */
{
I2C.Byte = Byte; /* copy control byte */
I2C_WriteByte(I2C_DATA); /* send byte */
}
}
/* todo: error handling? */
}
/*
* end sending I2C data
* - end I2C transfer
* - manage multi byte mode
*/
void LCD_EndTransfer(void)
{
/* reset control flag anyway */
MultiByte = 0; /* single byte mode */
/* end I2C transfer */
I2C_Stop(); /* stop */
}
/*
* send a command to the LCD
*
* requires:
* - byte value to send
*/
void LCD_Cmd(uint8_t Cmd)
{
if (MultiByte == 0) /* single byte mode */
{
/* init transfer */
LCD_StartTransfer(CTRL_SINGLE | CTRL_CMD);
}
/* send command */
I2C.Byte = Cmd; /* copy command */
I2C_WriteByte(I2C_DATA); /* send command */
if (MultiByte == 0) /* single byte mode */
{
LCD_EndTransfer(); /* end transfer */
}
}
/*
* send data to the LCD
*
* requires:
* - byte value to send
*/
void LCD_Data(uint8_t Data)
{
if (MultiByte == 0) /* single byte mode */
{
/* init transfer */
LCD_StartTransfer(CTRL_SINGLE | CTRL_DATA);
}
/* send command */
I2C.Byte = Data; /* copy data */
I2C_WriteByte(I2C_DATA); /* send data */
if (MultiByte == 0) /* single byte mode */
{
LCD_EndTransfer(); /* end transfer */
}
}
#endif
/* ************************************************************************
* high level functions
* ************************************************************************ */
/*
* set LCD dot position
* - since we can't read the LCD and don't use a RAM buffer
* we have to move page-wise in y direction
* - top left: 0/0
*
* requires:
* - x: horizontal position (0-)
* - y: vertical position (0-)
*/
void LCD_DotPos(uint8_t x, uint8_t y)
{
uint8_t Temp; /* temp. value */
#ifdef LCD_I2C
/* init transfer */
LCD_StartTransfer(CTRL_MULTI | CTRL_CMD);
#endif
/* horizontal position (column) */
Temp = x;
Temp &= 0b00001111; /* filter lower nibble */
LCD_Cmd(CMD_COLUMN_L | Temp); /* set lower nibble */
Temp = x;
Temp >>= 4; /* shift upper nibble to lower */
Temp &= 0b00001111; /* filter nibble */
LCD_Cmd(CMD_COLUMN_H | Temp); /* set upper nibble */
/* vertical position (page) */
LCD_Cmd(CMD_PAGE | y); /* set page */
#ifdef LCD_I2C
LCD_EndTransfer(); /* end transfer */
#endif
}
/*
* set LCD character position
* - since we can't read the LCD and don't use a RAM buffer
* we have to move page-wise in y direction
* - 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) */
x--; /* columns start at 0 */
x *= FONT_SIZE_X; /* offset for character */
#ifdef LCD_OFFSET_X
x += LCD_OFFSET_X; /* add display offset */
#endif
X_Start = x; /* update start position */
/* vertical position (page) */
y--; /* pages start at 0 */
y *= CHAR_PAGES; /* offset for character */
Y_Start = y; /* update start position */
/* update display */
LCD_DotPos(x, y); /* set dot 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)
{
uint8_t MaxPage; /* page limit */
uint8_t n = 1; /* counter */
if (Line == 0) /* special case: rest of current line */
{
Line = UI.CharPos_Y; /* get current line */
n = UI.CharPos_X; /* get current character position */
}
LCD_CharPos(n, Line); /* set char position */
/* address limit for X */
#ifdef LCD_OFFSET_X
/* consider X offset */
#define LCD_MAX_X (LCD_DOTS_X + LCD_OFFSET_X)
#else
/* native X resolution */
#define LCD_MAX_X LCD_DOTS_X
#endif
/* calculate pages */
Line = Y_Start; /* get start page */
MaxPage = Line + CHAR_PAGES; /* end page + 1 */
/* clear line */
while (Line < MaxPage) /* loop through pages */
{
LCD_DotPos(X_Start, Line); /* set dot position */
#ifdef LCD_I2C
/* init transfer */
LCD_StartTransfer(CTRL_MULTI | CTRL_DATA);
#endif
/* clear page */
n = X_Start; /* reset counter */
while (n < LCD_MAX_X) /* for all columns */
{
LCD_Data(0); /* send empty byte */
n++; /* next byte */
}
#ifdef LCD_I2C
LCD_EndTransfer(); /* end transfer */
#endif
Line++; /* next page */
}
/* clean up local constants */
#undef LCD_MAX_X
}
/*
* clear the display
*/
void LCD_Clear(void)
{
uint8_t n = 1; /* counter */
/* we have to clear all dots manually :( */
while (n <= LCD_CHAR_Y) /* for all lines */
{
LCD_ClearLine(n); /* clear line */
n++; /* next line */
}
LCD_CharPos(1, 1); /* reset character position */
}
/*
* set contrast
*
* required:
* - Contrast: 0-255
*/
void LCD_Contrast(uint8_t Contrast)
{
/* set contrast */
LCD_Cmd(CMD_CONTRAST); /* set command */
LCD_Cmd(Contrast); /* contrast value */
NV.Contrast = Contrast; /* update value */
}
/*
* initialize LCD
*/
void LCD_Init(void)
{
#ifdef LCD_RESET
/* reset display */
LCD_PORT &= ~(1 << LCD_RESET); /* set /RES low */
wait10us(); /* wait 10µs */
LCD_PORT |= (1 << LCD_RESET); /* set /RES high */
wait2us(); /* wait 2µs */
#endif
#if 0
/* enable internal DC-DC converter */
LCD_Cmd(CMD_DC_DC);
LCD_Cmd(FLAG_DC_DC_ON);
#endif
/* COM pin hardware configuration */
#ifdef LCD_COM_SEQ
LCD_Cmd(CMD_COM_CONFIG_SET); /* COM pin hardware config */
LCD_Cmd(FLAG_COM_SEQ); /* sequential */
#endif
/* segment mapping */
#ifdef LCD_FLIP_X
LCD_Cmd(CMD_SEGMENT_MAP | FLAG_SEG_131); /* flip horizontally */
#endif
/* COM output scan direction */
#ifdef LCD_FLIP_Y
LCD_Cmd(CMD_COM_SCAN_DIR | FLAG_COM_63); /* flip vertically */
#endif
/* set contrast: default value */
LCD_Contrast(LCD_CONTRAST);
/* switch display on */
LCD_Cmd(CMD_DISPLAY | FLAG_DISPLAY_ON);
/* display needs about 100ms */
/* update maximums */
UI.CharMax_X = LCD_CHAR_X; /* characters per line */
UI.CharMax_Y = LCD_CHAR_Y; /* lines */
UI.MaxContrast = 255; /* maximum LCD contrast */
#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 display */
}
/*
* 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 Page; /* page number */
uint8_t x; /* bitmap x byte counter */
uint8_t y = 1; /* bitmap y byte 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 */
/*
* manage addressing
*/
/* 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 */
/*
* send character bitmap to display
*/
Page = Y_Start; /* get start page */
/* read character bitmap and send it to display */
while (y <= FONT_BYTES_Y)
{
LCD_DotPos(X_Start, Page); /* set start position */
#ifdef LCD_I2C
/* init transfer */
LCD_StartTransfer(CTRL_MULTI | CTRL_DATA);
#endif
/* read and send all column bytes for this row (page) */
x = 1; /* reset counter */
while (x <= FONT_BYTES_X)
{
Index = pgm_read_byte(Table); /* read byte */
LCD_Data(Index); /* send byte */
Table++; /* address for next byte */
x++; /* next byte */
}
#ifdef LCD_I2C
LCD_EndTransfer(); /* end transfer */
#endif
Page++; /* next page */
y++; /* next row */
}
/* update character position */
UI.CharPos_X++; /* next character in current line */
X_Start += FONT_SIZE_X; /* also update X dot position */
}
/*
* set cursor
*
* required:
* - Mode: cursor mode
* 0: cursor on
* 1: cursor off
*/
void LCD_Cursor(uint8_t Mode)
{
LCD_CharPos(LCD_CHAR_X, LCD_CHAR_Y); /* move to bottom right */
if (Mode) /* cursor on */
{
LCD_Char('>');
}
else /* cursor off */
{
LCD_Char(' ');
}
}
/* ************************************************************************
* fancy stuff
* ************************************************************************ */
#ifdef SW_SYMBOLS
/*
* display a component symbol
*
* requires:
* - ID: symbol to display
*/
void LCD_Symbol(uint8_t ID)
{
uint8_t *Table; /* pointer to symbol table */
uint8_t Data; /* symbol data */
uint16_t Offset; /* address offset */
uint8_t Page; /* page number */
uint8_t x; /* bitmap x byte counter */
uint8_t y = 1; /* bitmap y byte counter */
/* calculate start address of character bitmap */
Table = (uint8_t *)&SymbolData; /* start address of symbol data */
Offset = SYMBOL_BYTES_N * ID; /* offset for symbol */
Table += Offset; /* address of symbol data */
Page = Y_Start; /* get start page */
/* read character bitmap and send it to display */
while (y <= SYMBOL_BYTES_Y)
{
if (y > 1) /* multi-page bitmap */
{
LCD_DotPos(X_Start, Page); /* move to new page */
}
#ifdef LCD_I2C
/* init transfer */
LCD_StartTransfer(CTRL_MULTI | CTRL_DATA);
#endif
/* read and send all column bytes for this row */
x = 1;
while (x <= SYMBOL_BYTES_X)
{
Data = pgm_read_byte(Table); /* read byte */
LCD_Data(Data); /* send byte */
Table++; /* address for next byte */
x++; /* next byte */
}
#ifdef LCD_I2C
LCD_EndTransfer(); /* end transfer */
#endif
Page++; /* next page */
y++; /* next row */
}
/* hint: we don't update the char position */
}
#endif
/* ************************************************************************
* clean-up of local constants
* ************************************************************************ */
/* source management */
#undef LCD_DRIVER_C
#endif
/* ************************************************************************
* EOF
* ************************************************************************ */