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Add Adafuit Init Command List for testing purpose 0.91 / 128x32 oled

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This commit is contained in:
Matiasus 2023-12-19 22:42:11 +01:00
parent d9b7bb7511
commit 3444217ae6
4 changed files with 196 additions and 343 deletions
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29
Makefile
View File

@ -13,7 +13,7 @@
# ------------------------------------------------------------------
#
# Final file
TARGET = main
TARGET = main
#
# Library directory
LIBDIR = lib
@ -22,7 +22,7 @@ LIBDIR = lib
DEVICE = atmega328p
#
# Frequency
FCPU = 8000000
FCPU = 16000000
#
# Optimization
OPTIMIZE = Os
@ -53,7 +53,7 @@ AVRSIZE = avr-size
SFLAGS = --mcu=$(DEVICE) --format=avr
#
# Target and dependencies .c
SOURCES := $(wildcard *.c $(LIBDIR)/*.c)
SOURCES := $(wildcard *.c $(LIBDIR)/*.c $(LIBDIR)/*/*.c)
#
# Target and dependencies .o
OBJECTS = $(SOURCES:.c=.o)
@ -75,7 +75,7 @@ AVRDUDE_PORT = /dev/ttyUSB0
AVRDUDE_PROG = usbasp
#
# AVRDUDE BAUD RATE
AVRDUDE_BAUD = 57600
AVRDUDE_BAUD = 19200
#
# AVRDUDE BAUD RATE
AVROBJ_FORMAT = ihex
@ -91,8 +91,8 @@ main: $(TARGET).hex
# Create hex file
$(TARGET).hex: $(TARGET).elf
$(OBJCOPY) $(OBJFLAGS) $(TARGET).elf $(TARGET).hex
@echo "-----------------------------------------------------------------------"
$(AVRSIZE) $(TARGET).elf
#
# Create .elf file
$(TARGET).elf:$(OBJECTS)
@ -105,17 +105,24 @@ $(TARGET).elf:$(OBJECTS)
#
# Program avr - send file to programmer
flash:
flash:
@echo "-----------------------------------------------------------------------"
$(AVRDUDE) $(AVRDUDE_FLAGS) flash:w:$(TARGET).hex:i
#
# Size
size:
@echo "-----------------------------------------------------------------------"
$(AVRSIZE) -C --mcu=$(DEVICE) $(TARGET).elf
#
# Clean
clean:
clean:
@echo "-----------------------------------------------------------------------"
rm -f $(OBJECTS) $(TARGET).elf $(TARGET).map
#
# Cleanall
cleanall:
rm -f $(OBJECTS) $(TARGET).hex $(TARGET).elf $(TARGET).map
cleanall:
@echo "-----------------------------------------------------------------------"
rm -f $(OBJECTS) $(TARGET).hex $(TARGET).elf $(TARGET).map

452
lib/ssd1306.c
View File

@ -1,6 +1,6 @@
/**
* --------------------------------------------------------------------------------------+
* @desc SSD1306 OLED Driver
* @brief SSD1306 OLED Driver
* --------------------------------------------------------------------------------------+
* Copyright (C) 2020 Marian Hrinko.
* Written by Marian Hrinko (mato.hrinko@gmail.com)
@ -24,116 +24,76 @@
// @includes
#include "ssd1306.h"
// +---------------------------+
// | Set MUX Ratio |
// +---------------------------+
// | 0xA8, 0x3F |
// +---------------------------+
// |
// +---------------------------+
// | Set Display Offset |
// +---------------------------+
// | 0xD3, 0x00 |
// +---------------------------+
// |
// +---------------------------+
// | Set Display Start Line |
// +---------------------------+
// | 0x40 |
// +---------------------------+
// |
// +---------------------------+
// | Set Segment Remap |
// +---------------------------+
// | 0xA0 / 0xA1 |
// +---------------------------+
// |
// +---------------------------+
// | Set COM Output Scan |
// | Direction |
// +---------------------------+
// | 0xC0 / 0xC8 |
// +---------------------------+
// |
// +---------------------------+
// | Set COM Pins hardware |
// | configuration |
// +---------------------------+
// | 0xDA, 0x02 |
// +---------------------------+
// |
// +---------------------------+
// | Set Contrast Control |
// +---------------------------+
// | 0x81, 0x7F |
// +---------------------------+
// |
// +---------------------------+
// | Disable Entire Display On |
// +---------------------------+
// | 0xA4 |
// +---------------------------+
// |
// +---------------------------+
// | Set Normal Display |
// +---------------------------+
// | 0xA6 |
// +---------------------------+
// |
// +---------------------------+
// | Set Osc Frequency |
// +---------------------------+
// | 0xD5, 0x80 |
// +---------------------------+
// |
// +---------------------------+
// | Enable charge pump |
// | regulator |
// +---------------------------+
// | 0x8D, 0x14 |
// +---------------------------+
// |
// +---------------------------+
// | Display On |
// +---------------------------+
// | 0xAF |
// +---------------------------+
// @const List of init commands with arguments by Adafruit
// @link https://github.com/adafruit/Adafruit_SSD1306
const uint8_t INIT_SSD1306_ADAFRUIT[] PROGMEM = {
17, // number of initializers
SSD1306_DISPLAY_OFF, 0, // 0xAE / Set Display OFF
SSD1306_SET_OSC_FREQ, 1, 0x80, // 0xD5 / 0x80 => D=1; DCLK = Fosc / D <=> DCLK = Fosc
SSD1306_SET_MUX_RATIO, 1, 0x1F, // 0xA8 / 0x3F (64MUX) for 128 x 64 version
// / 0x1F (32MUX) for 128 x 32 version
SSD1306_DISPLAY_OFFSET, 1, 0x00, // 0xD3
SSD1306_SET_START_LINE, 0, // 0x40
SSD1306_SET_CHAR_REG, 1, 0x14, // 0x8D / Enable charge pump during display on
SSD1306_MEMORY_ADDR_MODE, 1, 0x00, // 0x20 / Set Memory Addressing Mode
// 0x00 / Horizontal Addressing Mode
// 0x01 / Vertical Addressing Mode
// 0x02 / Page Addressing Mode (RESET)
SSD1306_SEG_REMAP_OP, 0, // 0xA0 / remap 0xA1
SSD1306_COM_SCAN_DIR_OP, 0, // 0xC8
SSD1306_COM_PIN_CONF, 0, 0x02, // 0xDA / 0x12 - Disable COM Left/Right remap, Alternative COM pin configuration
// 0x12 - for 128 x 64 version
// 0x02 - for 128 x 32 version
SSD1306_SET_CONTRAST, 1, 0x8F, // 0x81 / 0x8F - reset value (max 0xFF)
SSD1306_SET_PRECHARGE, 1, 0xc2, // 0xD9 / higher value less blinking
// 0xC2, 1st phase = 2 DCLK, 2nd phase = 13 DCLK
SSD1306_VCOM_DESELECT, 1, 0x40, // 0xDB / Set V COMH Deselect, reset value 0x22 = 0,77xUcc
SSD1306_DIS_ENT_DISP_ON, 0, // 0xA4
SSD1306_DIS_NORMAL, 0, // 0xA6
SSD1306_DEACT_SCROLL, 0, // 0x2E
SSD1306_DISPLAY_ON, 0 // 0xAF / Set Display ON
};
// @array Init command
// @const uint8_t - List of init commands according to datasheet SSD1306
const uint8_t INIT_SSD1306[] PROGMEM = {
18, // number of initializers
0, SSD1306_DISPLAY_OFF, // 0xAE = Set Display OFF
1, SSD1306_SET_MUX_RATIO, 63, // 0xA8 - 64MUX for 128 x 64 version
// - 32MUX for 128 x 32 version
1, SSD1306_MEMORY_ADDR_MODE, 0x00, // 0x20 = Set Memory Addressing Mode
17, // number of initializers
SSD1306_DISPLAY_OFF, 0, // 0xAE = Set Display OFF
SSD1306_SET_MUX_RATIO, 1, 0x1F, // 0xA8 - 0x3F for 128 x 64 version (64MUX)
// - 0x1F for 128 x 32 version (32MUX)
SSD1306_MEMORY_ADDR_MODE, 1, 0x00, // 0x20 = Set Memory Addressing Mode
// 0x00 - Horizontal Addressing Mode
// 0x01 - Vertical Addressing Mode
// 0x02 - Page Addressing Mode (RESET)
2, SSD1306_SET_COLUMN_ADDR, START_COLUMN_ADDR, END_COLUMN_ADDR, // 0x21 = Set Column Address, 0 - 127
2, SSD1306_SET_PAGE_ADDR, START_PAGE_ADDR, END_PAGE_ADDR, // 0x22 = Set Page Address, 0 - 7
0, SSD1306_SET_START_LINE, // 0x40
1, SSD1306_DISPLAY_OFFSET, 0x00, // 0xD3
0, SSD1306_SEG_REMAP_OP, // 0xA0 / remap 0xA1
0, SSD1306_COM_SCAN_DIR_OP, // 0xC0 / remap 0xC8
1, SSD1306_COM_PIN_CONF, 0x12, // 0xDA, 0x12 - Disable COM Left/Right remap, Alternative COM pin configuration
SSD1306_SET_START_LINE, 0, // 0x40
SSD1306_DISPLAY_OFFSET, 1, 0x00, // 0xD3
SSD1306_SEG_REMAP_OP, 0, // 0xA0 / remap 0xA1
SSD1306_COM_SCAN_DIR_OP, 0, // 0xC0 / remap 0xC8
SSD1306_COM_PIN_CONF, 1, 0x02, // 0xDA, 0x12 - Disable COM Left/Right remap, Alternative COM pin configuration
// 0x12 - for 128 x 64 version
// 0x02 - for 128 x 32 version
1, SSD1306_SET_CONTRAST, 0x7F, // 0x81, 0x7F - reset value (max 0xFF)
0, SSD1306_DIS_ENT_DISP_ON, // 0xA4
0, SSD1306_DIS_NORMAL, // 0xA6
1, SSD1306_SET_OSC_FREQ, 0x80, // 0xD5, 0x80 => D=1; DCLK = Fosc / D <=> DCLK = Fosc
1, SSD1306_SET_PRECHARGE, 0xc2, // 0xD9, higher value less blinking
SSD1306_SET_CONTRAST, 1, 0x7F, // 0x81, 0x7F - reset value (max 0xFF)
SSD1306_DIS_ENT_DISP_ON, 0, // 0xA4
SSD1306_DIS_NORMAL, 0, // 0xA6
SSD1306_SET_OSC_FREQ, 1, 0x80, // 0xD5, 0x80 => D=1; DCLK = Fosc / D <=> DCLK = Fosc
SSD1306_SET_PRECHARGE, 1, 0xc2, // 0xD9, higher value less blinking
// 0xC2, 1st phase = 2 DCLK, 2nd phase = 13 DCLK
1, SSD1306_VCOM_DESELECT, 0x20, // Set V COMH Deselect, reset value 0x22 = 0,77xUcc
1, SSD1306_SET_CHAR_REG, 0x14, // 0x8D, Enable charge pump during display on
0, SSD1306_DISPLAY_ON // 0xAF = Set Display ON
SSD1306_VCOM_DESELECT, 1, 0x20, // Set V COMH Deselect, reset value 0x22 = 0,77xUcc
SSD1306_SET_CHAR_REG, 1, 0x14, // 0x8D, Enable charge pump during display on
SSD1306_DEACT_SCROLL, 0, // 0x2E
SSD1306_DISPLAY_ON, 0 // 0xAF = Set Display ON
};
// @var array Chache memory Lcd 8 * 128 = 1024
static char cacheMemLcd[CACHE_SIZE_MEM];
/**
* @desc SSD1306 Init
* +------------------------------------------------------------------------------------+
* |== PRIVATE FUNCTIONS ===============================================================|
* +------------------------------------------------------------------------------------+
*/
/**
* @brief SSD1306 Init
*
* @param uint8_t address
*
@ -141,72 +101,48 @@ static char cacheMemLcd[CACHE_SIZE_MEM];
*/
uint8_t SSD1306_Init (uint8_t address)
{
// variables
const uint8_t *commands = INIT_SSD1306;
// number of commands
unsigned short int no_of_commands = pgm_read_byte(commands++);
// argument
uint8_t no_of_arguments;
// command
uint8_t command;
// init status
uint8_t status = INIT_STATUS;
const uint8_t * list = INIT_SSD1306;
uint8_t status = INIT_STATUS; // init status
uint8_t arguments;
uint8_t commands = pgm_read_byte (list++);
// TWI: Init
// -------------------------------------------------------------------------------------
TWI_Init ();
// TWI: start & SLAW
// -------------------------------------------------------------------------------------
status = SSD1306_Send_StartAndSLAW (address);
// request - start TWI
if (SSD1306_SUCCESS != status) {
// error
return status;
}
// loop through commands
while (no_of_commands) {
// number of arguments
no_of_arguments = pgm_read_byte (commands++);
// command
command = pgm_read_byte (commands++);
// send command
// Commands & Arguments
// -------------------------------------------------------------------------------------
status = SSD1306_Send_Command (command);
// request - start TWI
while (commands--) {
// Command
// -----------------------------------------------------------------------------------
status = SSD1306_Send_Command (pgm_read_byte(list++));
if (SSD1306_SUCCESS != status) {
// error
return status;
}
// send arguments
// -------------------------------------------------------------------------------------
while (no_of_arguments--) {
// send command
status = SSD1306_Send_Command (pgm_read_byte(commands++));
// request - start TWI
// Arguments
// -----------------------------------------------------------------------------------
arguments = pgm_read_byte (list++);
while (arguments--) {
status = SSD1306_Send_Command (pgm_read_byte(list++)); // argument
if (SSD1306_SUCCESS != status) {
// error
return status;
}
}
// decrement
no_of_commands--;
}
// TWI: Stop
// -------------------------------------------------------------------------------------
TWI_Stop ();
// success
return SSD1306_SUCCESS;
}
/**
* @desc SSD1306 Send Start and SLAW request
* @brief SSD1306 Send Start and SLAW request
*
* @param uint8_t
*
@ -214,33 +150,26 @@ uint8_t SSD1306_Init (uint8_t address)
*/
uint8_t SSD1306_Send_StartAndSLAW (uint8_t address)
{
// init status
uint8_t status = INIT_STATUS;
// TWI: start
// -------------------------------------------------------------------------------------
status = TWI_MT_Start ();
// request - start TWI
if (SSD1306_SUCCESS != status) {
// error
return status;
}
// TWI: send SLAW
// -------------------------------------------------------------------------------------
status = TWI_MT_Send_SLAW (address);
// request - send SLAW
if (SSD1306_SUCCESS != status) {
// error
return status;
}
// success
return SSD1306_SUCCESS;
}
/**
* @desc SSD1306 Send command
* @brief SSD1306 Send command
*
* @param uint8_t command
*
@ -248,33 +177,32 @@ uint8_t SSD1306_Send_StartAndSLAW (uint8_t address)
*/
uint8_t SSD1306_Send_Command (uint8_t command)
{
// init status
uint8_t status = INIT_STATUS;
// send control byte
// -------------------------------------------------------------------------------------
status = TWI_MT_Send_Data (SSD1306_COMMAND);
// request - start TWI
if (SSD1306_SUCCESS != status) {
// error
return status;
}
// send command
// -------------------------------------------------------------------------------------
status = TWI_MT_Send_Data (command);
// request - start TWI
if (SSD1306_SUCCESS != status) {
// error
return status;
}
// success
return SSD1306_SUCCESS;
}
/**
* @desc SSD1306 Normal colors
* +------------------------------------------------------------------------------------+
* |== PUBLIC FUNCTIONS ================================================================|
* +------------------------------------------------------------------------------------+
*/
/**
* @brief SSD1306 Normal colors
*
* @param uint8_t address
*
@ -282,33 +210,29 @@ uint8_t SSD1306_Send_Command (uint8_t command)
*/
uint8_t SSD1306_NormalScreen (uint8_t address)
{
// init status
uint8_t status = INIT_STATUS;
// TWI: start & SLAW
// -------------------------------------------------------------------------------------
status = SSD1306_Send_StartAndSLAW (address);
// request succesfull
if (SSD1306_SUCCESS != status) {
// error
return status;
}
// send command
// -------------------------------------------------------------------------------------
status = SSD1306_Send_Command (SSD1306_DIS_NORMAL);
// request succesfull
if (SSD1306_SUCCESS != status) {
// error
return status;
}
// TWI: Stop
// -------------------------------------------------------------------------------------
TWI_Stop ();
// success
return SSD1306_SUCCESS;
}
/**
* @desc SSD1306 Inverse colors
* @brief SSD1306 Inverse colors
*
* @param uint8_t address
*
@ -316,33 +240,29 @@ uint8_t SSD1306_NormalScreen (uint8_t address)
*/
uint8_t SSD1306_InverseScreen (uint8_t address)
{
// init status
uint8_t status = INIT_STATUS;
// TWI: start & SLAW
// -------------------------------------------------------------------------------------
status = SSD1306_Send_StartAndSLAW (address);
// request succesfull
if (SSD1306_SUCCESS != status) {
// error
return status;
}
// send command
// -------------------------------------------------------------------------------------
status = SSD1306_Send_Command (SSD1306_DIS_INVERSE);
// request succesfull
if (SSD1306_SUCCESS != status) {
// error
return status;
}
// TWI: Stop
// -------------------------------------------------------------------------------------
TWI_Stop ();
// success
return SSD1306_SUCCESS;
}
/**
* @desc SSD1306 Update screen
* @brief SSD1306 Update screen
*
* @param uint8_t address
*
@ -350,52 +270,38 @@ uint8_t SSD1306_InverseScreen (uint8_t address)
*/
uint8_t SSD1306_UpdateScreen (uint8_t address)
{
// init status
uint8_t status = INIT_STATUS;
// init i
uint16_t i = 0;
// TWI: start & SLAW
// -------------------------------------------------------------------------------------
status = SSD1306_Send_StartAndSLAW (address);
// request succesfull
if (SSD1306_SUCCESS != status) {
// error
return status;
}
// control byte data stream
// -------------------------------------------------------------------------------------
status = TWI_MT_Send_Data (SSD1306_DATA_STREAM);
// request succesfull
if (SSD1306_SUCCESS != status) {
// error
return status;
}
// send cache memory lcd
// -------------------------------------------------------------------------------------
while (i < CACHE_SIZE_MEM) {
// send data
status = TWI_MT_Send_Data (cacheMemLcd[i]);
// request succesfull
status = TWI_MT_Send_Data (cacheMemLcd[i++]); // send data
if (SSD1306_SUCCESS != status) {
// error
return status;
}
// increment
i++;
}
// stop TWI
// -------------------------------------------------------------------------------------
TWI_Stop ();
// success
return SSD1306_SUCCESS;
}
/**
* @desc SSD1306 Clear screen
* @brief SSD1306 Clear screen
*
* @param void
*
@ -403,12 +309,11 @@ uint8_t SSD1306_UpdateScreen (uint8_t address)
*/
void SSD1306_ClearScreen (void)
{
// null cache memory lcd
memset (cacheMemLcd, 0x00, CACHE_SIZE_MEM);
memset (cacheMemLcd, 0x00, CACHE_SIZE_MEM); // null cache memory lcd
}
/**
* @desc SSD1306 Set position
* @brief SSD1306 Set position
*
* @param uint8_t column -> 0 ... 127
* @param uint8_t page -> 0 ... 7 or 3
@ -417,12 +322,11 @@ void SSD1306_ClearScreen (void)
*/
void SSD1306_SetPosition (uint8_t x, uint8_t y)
{
// calculate counter
_counter = x + (y << 7);
_counter = x + (y << 7); // update counter
}
/**
* @desc SSD1306 Update text poisition - this ensure that character will not be divided at the end of row,
* @brief SSD1306 Update text poisition - this ensure that character will not be divided at the end of row,
* the whole character will be depicted on the new row
*
* @param void
@ -431,32 +335,23 @@ void SSD1306_SetPosition (uint8_t x, uint8_t y)
*/
uint8_t SSD1306_UpdatePosition (void)
{
// y / 8
uint8_t y = _counter >> 7;
// y % 8
uint8_t x = _counter - (y << 7);
// x + character length + 1
uint8_t x_new = x + CHARS_COLS_LENGTH + 1;
// check position
if (x_new > END_COLUMN_ADDR) {
// if more than allowable number of pages
if (y > END_PAGE_ADDR) {
// return out of range
return SSD1306_ERROR;
// if x reach the end but page in range
} else if (y < (END_PAGE_ADDR-1)) {
// update
_counter = ((++y) << 7);
uint8_t y = _counter >> 7; // y / 8
uint8_t x = _counter - (y << 7); // y % 8
uint8_t x_new = x + CHARS_COLS_LENGTH + 1; // x + character length + 1
if (x_new > END_COLUMN_ADDR) { // check position
if (y > END_PAGE_ADDR) { // if more than allowable number of pages
return SSD1306_ERROR; // return out of range
} else if (y < (END_PAGE_ADDR-1)) { // if x reach the end but page in range
_counter = ((++y) << 7); // update
}
}
// success
return SSD1306_SUCCESS;
}
/**
* @desc SSD1306 Draw character
* @brief SSD1306 Draw character
*
* @param char character
*
@ -464,31 +359,21 @@ uint8_t SSD1306_UpdatePosition (void)
*/
uint8_t SSD1306_DrawChar (char character)
{
// variables
uint8_t i = 0;
// update text position
// this ensure that character will not be divided at the end of row, the whole character will be depicted on the new row
if (SSD1306_UpdatePosition () == SSD1306_ERROR) {
// error
return SSD1306_ERROR;
}
// loop through 5 bits
while (i < CHARS_COLS_LENGTH) {
// read byte
cacheMemLcd[_counter++] = pgm_read_byte(&FONTS[character-32][i++]);
}
// update position
_counter++;
// success
return SSD1306_SUCCESS;
}
/**
* @desc SSD1306 Draw String
* @brief SSD1306 Draw String
*
* @param char * string
*
@ -496,17 +381,14 @@ uint8_t SSD1306_DrawChar (char character)
*/
void SSD1306_DrawString (char *str)
{
// init
int i = 0;
// loop through character of string
while (str[i] != '\0') {
// draw string
SSD1306_DrawChar (str[i++]);
}
}
/**
* @desc Draw pixel
* @brief Draw pixel
*
* @param uint8_t x -> 0 ... MAX_X
* @param uint8_t y -> 0 ... MAX_Y
@ -517,27 +399,20 @@ uint8_t SSD1306_DrawPixel (uint8_t x, uint8_t y)
{
uint8_t page = 0;
uint8_t pixel = 0;
// if out of range
if ((x > MAX_X) || (y > MAX_Y)) {
// out of range
return SSD1306_ERROR;
if ((x > MAX_X) || (y > MAX_Y)) { // if out of range
return SSD1306_ERROR; // out of range
}
// find page (y / 8)
page = y >> 3;
// which pixel (y % 8)
pixel = 1 << (y - (page << 3));
// update counter
_counter = x + (page << 7);
// save pixel
cacheMemLcd[_counter++] |= pixel;
page = y >> 3; // find page (y / 8)
pixel = 1 << (y - (page << 3)); // which pixel (y % 8)
_counter = x + (page << 7); // update counter
cacheMemLcd[_counter++] |= pixel; // save pixel
// success
return SSD1306_SUCCESS;
}
/**
* @desc Draw line by Bresenham algoritm
* @brief Draw line by Bresenham algoritm
*
* @param uint8_t x start position / 0 <= cols <= MAX_X-1
* @param uint8_t x end position / 0 <= cols <= MAX_X-1
@ -548,79 +423,52 @@ uint8_t SSD1306_DrawPixel (uint8_t x, uint8_t y)
*/
uint8_t SSD1306_DrawLine (uint8_t x1, uint8_t x2, uint8_t y1, uint8_t y2)
{
// determinant
int16_t D;
// deltas
int16_t delta_x, delta_y;
// steps
int16_t trace_x = 1, trace_y = 1;
int16_t D; // determinant
int16_t delta_x, delta_y; // deltas
int16_t trace_x = 1, trace_y = 1; // steps
// delta x
delta_x = x2 - x1;
// delta y
delta_y = y2 - y1;
// check if x2 > x1
if (delta_x < 0) {
// negate delta x
delta_x = -delta_x;
// negate step x
trace_x = -trace_x;
delta_x = x2 - x1; // delta x
delta_y = y2 - y1; // delta y
if (delta_x < 0) { // check if x2 > x1
delta_x = -delta_x; // negate delta x
trace_x = -trace_x; // negate step x
}
// check if y2 > y1
if (delta_y < 0) {
// negate detla y
delta_y = -delta_y;
// negate step y
trace_y = -trace_y;
if (delta_y < 0) { // check if y2 > y1
delta_y = -delta_y; // negate detla y
trace_y = -trace_y; // negate step y
}
// Bresenham condition for m < 1 (dy < dx)
// -------------------------------------------------------------------------------------
if (delta_y < delta_x) {
// calculate determinant
D = (delta_y << 1) - delta_x;
// draw first pixel
SSD1306_DrawPixel (x1, y1);
// check if x1 equal x2
while (x1 != x2) {
// update x1
x1 += trace_x;
// check if determinant is positive
if (D >= 0) {
// update y1
y1 += trace_y;
// update determinant
D -= 2*delta_x;
D = (delta_y << 1) - delta_x; // calculate determinant
SSD1306_DrawPixel (x1, y1); // draw first pixel
while (x1 != x2) { // check if x1 equal x2
x1 += trace_x; // update x1
if (D >= 0) { // check if determinant is positive
y1 += trace_y; // update y1
D -= 2*delta_x; // update determinant
}
// update deteminant
D += 2*delta_y;
// draw next pixel
SSD1306_DrawPixel (x1, y1);
D += 2*delta_y; // update deteminant
SSD1306_DrawPixel (x1, y1); // draw next pixel
}
// for m > 1 (dy > dx)
// -------------------------------------------------------------------------------------
} else {
// calculate determinant
D = delta_y - (delta_x << 1);
// draw first pixel
SSD1306_DrawPixel (x1, y1);
// check if y2 equal y1
while (y1 != y2) {
// update y1
y1 += trace_y;
// check if determinant is positive
if (D <= 0) {
// update y1
x1 += trace_x;
// update determinant
D += 2*delta_y;
D = delta_y - (delta_x << 1); // calculate determinant
SSD1306_DrawPixel (x1, y1); // draw first pixel
while (y1 != y2) { // check if y2 equal y1
y1 += trace_y; // update y1
if (D <= 0) { // check if determinant is positive
x1 += trace_x; // update y1
D += 2*delta_y; // update determinant
}
// update deteminant
D -= 2*delta_x;
// draw next pixel
SSD1306_DrawPixel (x1, y1);
D -= 2*delta_x; // update deteminant
SSD1306_DrawPixel (x1, y1); // draw next pixel
}
}
// success return
return SSD1306_SUCCESS;
}
}

2
lib/ssd1306.h
View File

@ -81,7 +81,7 @@
// AREA definition
// ------------------------------------------------------------------------------------
#define START_PAGE_ADDR 0
#define END_PAGE_ADDR 7 // 7 for 128x64, 3 for 128x32 version
#define END_PAGE_ADDR 3 // 7 for 128x64, 3 for 128x32 version
#define START_COLUMN_ADDR 0
#define END_COLUMN_ADDR 127
#define RAM_X_END END_COLUMN_ADDR + 1

56
main.c
View File

@ -1,20 +1,19 @@
/**
* --------------------------------------------------------------------------------------+
* @desc OLED SSD1306 example
* @name OLED SSD1306 example
* --------------------------------------------------------------------------------------+
* Copyright (C) 2020 Marian Hrinko.
* Written by Marian Hrinko (mato.hrinko@gmail.com)
*
* @author Marian Hrinko
* @date 06.10.2020
* @update 19.07.2021
* @file main.c
* @version 2.0.0
* @tested AVR Atmega328p
* @test AVR Atmega328p
*
* @depend lib/ssd1306.h
* --------------------------------------------------------------------------------------+
* @descr Version 1.0.0 -> applicable for 1 display
* @brief Version 1.0.0 -> applicable for 1 display
* Version 2.0.0 -> rebuild to 'cacheMemLcd' array
* Version 3.0.0 -> simplified alphanumeric version for 1 display
* --------------------------------------------------------------------------------------+
@ -22,6 +21,7 @@
// include libraries
#include "lib/ssd1306.h"
#include <util/delay.h>
/**
* @desc Main function
@ -32,32 +32,30 @@
*/
int main(void)
{
uint8_t addr = SSD1306_ADDR;
// LCD INIT
// -------------------------------------------------------------------------------------
SSD1306_Init (SSD1306_ADDR); // 0x3C
// init ssd1306
SSD1306_Init (addr);
// DRAWING
// -------------------------------------------------------------------------------------
SSD1306_ClearScreen (); // clear screen
SSD1306_DrawLine (0, MAX_X, 4, 4); // draw line
SSD1306_SetPosition (7, 1); // set position
SSD1306_DrawString ("SSD1306 OLED DRIVER"); // draw string
SSD1306_DrawLine (0, MAX_X, 18, 18); // draw line
SSD1306_SetPosition (40, 3); // set position
SSD1306_DrawString ("MATIASUS"); // draw string
SSD1306_SetPosition (53, 5); // set position
SSD1306_DrawString ("2021"); // draw string
SSD1306_UpdateScreen (SSD1306_ADDR); // update
// clear screen
SSD1306_ClearScreen ();
// draw line
SSD1306_DrawLine (0, MAX_X, 4, 4);
// set position
SSD1306_SetPosition (7, 1);
// draw string
SSD1306_DrawString ("SSD1306 OLED DRIVER");
// draw line
SSD1306_DrawLine (0, MAX_X, 18, 18);
// set position
SSD1306_SetPosition (40, 3);
// draw string
SSD1306_DrawString ("MATIASUS");
// set position
SSD1306_SetPosition (53, 5);
// draw string
SSD1306_DrawString ("2021");
// update
SSD1306_UpdateScreen (addr);
_delay_ms (1000);
SSD1306_InverseScreen (SSD1306_ADDR);
// return value
_delay_ms (1000);
SSD1306_NormalScreen (SSD1306_ADDR);
// RETURN
// -------------------------------------------------------------------------------------
return 0;
}
}