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ssd1306_linux/ssd1306.c

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#include <stdint.h>
#include <stdlib.h>
#include <inttypes.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux_i2c.h>
#include <ssd1306.h>
#include <font.h>
const char init_oled_type_file[] = "/tmp/.ssd1306_oled_type";
static uint8_t data_buf[1024];
static uint8_t max_lines = 0;
static uint8_t max_columns = 0;
static uint8_t global_x = 0;
static uint8_t global_y = 0;
uint8_t ssd1306_init(uint8_t i2c_dev)
{
uint8_t rc;
rc = _i2c_init(i2c_dev, SSD1306_I2C_ADDR);
if (rc > 0)
return rc;
// test i2c connection
uint8_t cmd = SSD1306_COMM_CONTROL_BYTE;
uint8_t result = 0;
_i2c_write(&cmd, 1);
_i2c_read(&result, 1);
if (result == 0)
return 1;
return 0;
}
uint8_t ssd1306_end()
{
return _i2c_close();
}
uint8_t ssd1306_oled_onoff(uint8_t onoff)
{
data_buf[0] = SSD1306_COMM_CONTROL_BYTE;
if (onoff == 0)
data_buf[1] = SSD1306_COMM_DISPLAY_OFF;
else
data_buf[1] = SSD1306_COMM_DISPLAY_ON;
return _i2c_write(data_buf, 2);
}
uint8_t ssd1306_oled_horizontal_flip(uint8_t flip)
{
data_buf[0] = SSD1306_COMM_CONTROL_BYTE;
if (flip == 0)
data_buf[1] = SSD1306_COMM_HORIZ_NORM;
else
data_buf[1] = SSD1306_COMM_HORIZ_FLIP;
return _i2c_write(data_buf, 2);
}
uint8_t ssd1306_oled_display_flip(uint8_t flip)
{
data_buf[0] = SSD1306_COMM_CONTROL_BYTE;
if (flip == 0)
data_buf[1] = SSD1306_COMM_DISP_NORM;
else
data_buf[1] = SSD1306_COMM_DISP_INVERSE;
return _i2c_write(data_buf, 2);
}
// 128x32 please use value 32
// 128x64 please use value 64
uint8_t ssd1306_oled_multiplex(uint8_t row)
{
data_buf[0] = SSD1306_COMM_CONTROL_BYTE;
data_buf[1] = SSD1306_COMM_MULTIPLEX;
data_buf[2] = row - 1;
return _i2c_write(data_buf, 3);
}
// offset range 0x00~0x3f
uint8_t ssd1306_oled_vert_shift(uint8_t offset)
{
data_buf[0] = SSD1306_COMM_CONTROL_BYTE;
data_buf[1] = SSD1306_COMM_VERT_OFFSET;
data_buf[2] = offset;
return _i2c_write(data_buf, 3);
}
// default value for clk is 0x80
uint8_t ssd1306_oled_set_clock(uint8_t clk)
{
data_buf[0] = SSD1306_COMM_CONTROL_BYTE;
data_buf[1] = SSD1306_COMM_CLK_SET;
data_buf[2] = clk;
return _i2c_write(data_buf, 3);
}
// default value for precharge is 0xf1
uint8_t ssd1306_oled_set_precharge(uint8_t precharge)
{
data_buf[0] = SSD1306_COMM_CONTROL_BYTE;
data_buf[1] = SSD1306_COMM_PRECHARGE;
data_buf[2] = precharge;
return _i2c_write(data_buf, 3);
}
// default value for deselect is 0x40
uint8_t ssd1306_oled_set_deselect(uint8_t voltage)
{
data_buf[0] = SSD1306_COMM_CONTROL_BYTE;
data_buf[1] = SSD1306_COMM_DESELECT_LV;
data_buf[2] = voltage;
return _i2c_write(data_buf, 3);
}
// default value for com pin is 0x02
uint8_t ssd1306_oled_set_com_pin(uint8_t value)
{
data_buf[0] = SSD1306_COMM_CONTROL_BYTE;
data_buf[1] = SSD1306_COMM_COM_PIN;
data_buf[2] = value;
return _i2c_write(data_buf, 3);
}
// default value use SSD1306_PAGE_MODE
uint8_t ssd1306_oled_set_mem_mode(uint8_t mode)
{
data_buf[0] = SSD1306_COMM_CONTROL_BYTE;
data_buf[1] = SSD1306_COMM_MEMORY_MODE;
data_buf[2] = mode;
return _i2c_write(data_buf, 3);
}
uint8_t ssd1306_oled_set_col(uint8_t start, uint8_t end)
{
data_buf[0] = SSD1306_COMM_CONTROL_BYTE;
data_buf[1] = SSD1306_COMM_SET_COL_ADDR;
data_buf[2] = start;
data_buf[3] = end;
return _i2c_write(data_buf, 4);
}
uint8_t ssd1306_oled_set_page(uint8_t start, uint8_t end)
{
data_buf[0] = SSD1306_COMM_CONTROL_BYTE;
data_buf[1] = SSD1306_COMM_SET_PAGE_ADDR;
data_buf[2] = start;
data_buf[3] = end;
return _i2c_write(data_buf, 4);
}
// default contrast value is 0x7f
uint8_t ssd1306_oled_set_constrast(uint8_t value)
{
data_buf[0] = SSD1306_COMM_CONTROL_BYTE;
data_buf[1] = SSD1306_COMM_CONTRAST;
data_buf[2] = value;
return _i2c_write(data_buf, 3);
}
uint8_t ssd1306_oled_scroll_onoff(uint8_t onoff)
{
data_buf[0] = SSD1306_COMM_CONTROL_BYTE;
if (onoff == 0)
data_buf[1] = SSD1306_COMM_DISABLE_SCROLL;
else
data_buf[1] = SSD1306_COMM_ENABLE_SCROLL;
return _i2c_write(data_buf, 2);
}
uint8_t ssd1306_oled_set_X(uint8_t x)
{
if (x >= max_columns)
return 1;
global_x = x;
data_buf[0] = SSD1306_COMM_CONTROL_BYTE;
data_buf[1] = SSD1306_COMM_LOW_COLUMN | (x & 0x0f);
data_buf[2] = SSD1306_COMM_HIGH_COLUMN | ((x >> 4) & 0x0f);
return _i2c_write(data_buf, 3);
}
uint8_t ssd1306_oled_set_Y(uint8_t y)
{
if (y >= (max_lines / 8))
return 1;
global_y = y;
data_buf[0] = SSD1306_COMM_CONTROL_BYTE;
data_buf[1] = SSD1306_COMM_PAGE_NUMBER | (y & 0x0f);
return _i2c_write(data_buf, 2);
}
uint8_t ssd1306_oled_set_XY(uint8_t x, uint8_t y)
{
if (x >= max_columns || y >= (max_lines / 8))
return 1;
global_x = x;
global_y = y;
data_buf[0] = SSD1306_COMM_CONTROL_BYTE;
data_buf[1] = SSD1306_COMM_PAGE_NUMBER | (y & 0x0f);
data_buf[2] = SSD1306_COMM_LOW_COLUMN | (x & 0x0f);
data_buf[3] = SSD1306_COMM_HIGH_COLUMN | ((x >> 4) & 0x0f);
return _i2c_write(data_buf, 4);
}
uint8_t ssd1306_oled_set_rotate(uint8_t degree)
{
// only degree 0 and 180
if (degree == 0)
{
data_buf[0] = SSD1306_COMM_CONTROL_BYTE;
data_buf[1] = SSD1306_COMM_HORIZ_FLIP;
data_buf[2] = SSD1306_COMM_SCAN_REVS;
return _i2c_write(data_buf, 3);
}
else if (degree == 180)
{
data_buf[0] = SSD1306_COMM_CONTROL_BYTE;
data_buf[1] = SSD1306_COMM_HORIZ_NORM;
data_buf[2] = SSD1306_COMM_SCAN_NORM;
return _i2c_write(data_buf, 3);
}
else
return 1;
}
uint8_t ssd1306_oled_default_config(uint8_t oled_lines, uint8_t oled_columns)
{
if (oled_lines != SSD1306_128_64_LINES && oled_lines != SSD1306_128_32_LINES && SSD1306_64_48_LINES)
oled_lines = SSD1306_128_64_LINES;
if (oled_columns != SSD1306_128_64_COLUMNS && oled_lines != SSD1306_128_32_COLUMNS && SSD1306_64_48_COLUMNS)
oled_columns = SSD1306_128_64_COLUMNS;
max_lines = oled_lines;
max_columns = oled_columns;
global_x = 0;
global_y = 0;
if (ssd1306_oled_save_resolution(max_columns, max_lines) != 0)
return 1;
uint16_t i = 0;
data_buf[i++] = SSD1306_COMM_CONTROL_BYTE; //command control byte
data_buf[i++] = SSD1306_COMM_DISPLAY_OFF; //display off
data_buf[i++] = SSD1306_COMM_DISP_NORM; //Set Normal Display (default)
data_buf[i++] = SSD1306_COMM_CLK_SET; //SETDISPLAYCLOCKDIV
data_buf[i++] = 0x80; // the suggested ratio 0x80
data_buf[i++] = SSD1306_COMM_MULTIPLEX; //SSD1306_SETMULTIPLEX
data_buf[i++] = oled_lines - 1; // height is 32 or 64 (always -1)
data_buf[i++] = SSD1306_COMM_VERT_OFFSET; //SETDISPLAYOFFSET
data_buf[i++] = 0; //no offset
data_buf[i++] = SSD1306_COMM_START_LINE; //SETSTARTLINE
data_buf[i++] = SSD1306_COMM_CHARGE_PUMP; //CHARGEPUMP
data_buf[i++] = 0x14; //turn on charge pump
data_buf[i++] = SSD1306_COMM_MEMORY_MODE; //MEMORYMODE
data_buf[i++] = SSD1306_PAGE_MODE; // page mode
data_buf[i++] = SSD1306_COMM_HORIZ_NORM; //SEGREMAP Mirror screen horizontally (A0)
data_buf[i++] = SSD1306_COMM_SCAN_NORM; //COMSCANDEC Rotate screen vertically (C0)
data_buf[i++] = SSD1306_COMM_COM_PIN; //HARDWARE PIN
if (oled_lines == 32)
data_buf[i++] = 0x02; // for 32 lines
else
data_buf[i++] = 0x12; // for 64 lines or 48 lines
data_buf[i++] = SSD1306_COMM_CONTRAST; //SETCONTRAST
data_buf[i++] = 0x7f; // default contract value
data_buf[i++] = SSD1306_COMM_PRECHARGE; //SETPRECHARGE
data_buf[i++] = 0xf1; // default precharge value
data_buf[i++] = SSD1306_COMM_DESELECT_LV; //SETVCOMDETECT
data_buf[i++] = 0x40; // default deselect value
data_buf[i++] = SSD1306_COMM_RESUME_RAM; //DISPLAYALLON_RESUME
data_buf[i++] = SSD1306_COMM_DISP_NORM; //NORMALDISPLAY
data_buf[i++] = SSD1306_COMM_DISPLAY_ON; //DISPLAY ON
data_buf[i++] = SSD1306_COMM_DISABLE_SCROLL;//Stop scroll
return _i2c_write(data_buf, i);
}
uint8_t ssd1306_oled_write_line(uint8_t size, char* ptr)
{
uint16_t i = 0;
uint16_t index = 0;
uint8_t* font_table = 0;
uint8_t font_table_width = 0;
if (ptr == 0)
return 1;
if (size == SSD1306_FONT_SMALL) // 5x7
{
font_table = (uint8_t*)font5x7;
font_table_width = 5;
}
else if (size == SSD1306_FONT_NORMAL) // 8x8
{
font_table = (uint8_t*)font8x8;
font_table_width = 8;
}
else
return 1;
data_buf[i++] = SSD1306_DATA_CONTROL_BYTE;
// font table range in ascii table is from 0x20(space) to 0x7e(~)
while (ptr[index] != 0 && i <= 1024)
{
if ((ptr[index] < ' ') || (ptr[index] > '~'))
return 1;
uint8_t* font_ptr = &font_table[(ptr[index] - 0x20) * font_table_width];
uint8_t j = 0;
for (j = 0; j < font_table_width; j++)
{
data_buf[i++] = font_ptr[j];
if (i > 1024)
return 1;
}
// insert 1 col space for small font size)
if (size == SSD1306_FONT_SMALL)
data_buf[i++] = 0x00;
index++;
}
return _i2c_write(data_buf, i);
}
uint8_t ssd1306_oled_write_string(uint8_t size, char* ptr)
{
uint8_t rc = 0;
if (ptr == 0)
return 1;
char* line = 0;
char* cr = 0;
char buf[20];
line = ptr;
do {
memset(buf, 0, 20);
cr = strstr(line, "\\n");
if (cr != NULL)
{
strncpy(buf, line, cr - line);
}
else
{
strcpy(buf, line);
}
// set cursor position
ssd1306_oled_set_XY(global_x, global_y);
rc += ssd1306_oled_write_line(size, buf);
if (cr != NULL)
{
line = &cr[2];
global_x = 0;
global_y++;
if (global_y >= (max_lines / 8))
global_y = 0;
}
else
line = NULL;
}while (line != NULL);
return rc;
}
uint8_t ssd1306_oled_clear_line(uint8_t row)
{
uint8_t i;
if (row >= (max_lines / 8))
return 1;
ssd1306_oled_set_XY(0, row);
data_buf[0] = SSD1306_DATA_CONTROL_BYTE;
for (i = 0; i < max_columns; i++)
data_buf[i+1] = 0x00;
return _i2c_write(data_buf, 1 + max_columns);
}
uint8_t ssd1306_oled_clear_screen()
{
uint8_t rc = 0;
uint8_t i;
for (i = 0; i < (max_lines / 8); i++)
{
rc += ssd1306_oled_clear_line(i);
}
return rc;
}
uint8_t ssd1306_oled_save_resolution(uint8_t column, uint8_t row)
{
FILE* fp;
fp = fopen(init_oled_type_file, "w");
if (fp == NULL)
{
// file create failed
return 1;
}
fprintf(fp, "%hhux%hhu", column, row);
fclose(fp);
return 0;
}
uint8_t ssd1306_oled_load_resolution()
{
FILE* fp;
fp = fopen(init_oled_type_file, "r");
if (fp == NULL)
{
// file not exists
return 1;
}
// file exists
fscanf(fp, "%hhux%hhu", &max_columns, &max_lines);
fclose(fp);
return 0;
}
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