#include <avr/io.h> #include <avr/delay.h> #include "i2cmaster.h" #include "myFont.h" //#define DevSSD1306 0xA2 // device address of EEPROM 24C02, see datasheet #define DevSSD1306 0x78 // device address of SSD1306 OLED, uses 8-bit address (0x3c)!!! // the memory buffer for the LCD static uint8_t buffer[(128 * 64) / 8] = { // 128 x 64 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 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0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55, 0xAA, 0x55 }; int main(void) { unsigned char ret; DDRB = 0xff; // use all pins on port B for output PORTB = 0x00; // (LED's low & off) i2c_init(); // init I2C interface /* write 0x75 to eeprom address 0x05 (Byte Write) */ ret = i2c_start(DevSSD1306+I2C_WRITE); // set device address and write mode if ( ret ) { /* failed to issue start condition, possibly no device found */ i2c_stop(); PORTB=0xff; // activate all 8 LED to show error */ } else { /* issuing start condition ok, device accessible */ // Init sequence for 128x64 OLED module i2c_write(0xAE); // Display Off i2c_write(0x00 | 0x0); // low col = 0 i2c_write(0x10 | 0x0); // hi col = 0 i2c_write(0x40 | 0x0); // line #0 i2c_write(0x81); // Set Contrast 0x81 i2c_write(0xCF); // flips display i2c_write(0xA1); // Segremap - 0xA1 i2c_write(0xC8); // COMSCAN DEC 0xC8 C0 i2c_write(0xA6); // Normal Display 0xA6 (Invert A7) i2c_write(0xA4); // DISPLAY ALL ON RESUME - 0xA4 i2c_write(0xA8); // Set Multiplex 0xA8 i2c_write(0x3F); // 1/64 Duty Cycle i2c_write(0xD3); // Set Display Offset 0xD3 i2c_write(0x0); // no offset i2c_write(0xD5); // Set Display Clk Div 0xD5 i2c_write(0x80); // Recommneded resistor ratio 0x80 i2c_write(0xD9); // Set Precharge 0xd9 i2c_write(0xF1); i2c_write(0xDA); // Set COM Pins0xDA i2c_write(0x12); i2c_write(0xDB); // Set VCOM Detect - 0xDB i2c_write(0x40); i2c_write(0x20); // Set Memory Addressing Mode i2c_write(0x00); // 0x00 - Horizontal i2c_write(0x40 | 0x0); // Set start line at line 0 - 0x40 i2c_write(0x8D); // Charge Pump -0x8D i2c_write(0x14); i2c_write(0xA4); //--turn on all pixels - A5. Regular mode A4 i2c_write(0xAF); //--turn on oled panel - AF //drawBuffer(0,0,buffer); //_delay_ms(1000); clearBuffer(buffer); ////lcd_draw_char(10, 2, 'B', buffer); lcd_draw_string(10, 0, "Hello World!", buffer); //lcd_draw_string(10, 7, "Elegant Circuits", buffer); drawBuffer(0,0, buffer); i2c_stop(); } for(;;){ } } void drawPixel(int16_t x, int16_t y){//, int16_t color){ //void drawPixel(int16_t x, int16_t y, int16_t color){ buffer[x+(y/8)*128] |= (1 << (y & 7)); } void clearBuffer(uint8_t *buff){ memset(buff, 0, ((128 * 64)/8)); } void drawBuffer(uint8_t column_address, uint8_t page_address, uint8_t *buff){ i2c_write(0x21); // column address i2c_write(0); // column start address (0 = reset) i2c_write(127); // column end addres (127 = reset) i2c_write(0x22); // page address i2c_write(0); // page start address (0 = reset); i2c_write(7); // page end address uint8_t twbrbackup = TWBR; TWBR = 12; for (uint16_t i=0; i<((128*64)/8); i++){ unsigned char ret = i2c_start(DevSSD1306+I2C_WRITE); // set device address and write mode if ( ret ) { /* failed to issue start condition, possibly no device found */ i2c_stop(); PORTB=0xff; // activate all 8 LED to show error */ } else { i2c_write(0x40); // set display RAM display start line register for (uint8_t x=0; x<16; x++){ i2c_write(buff[i]); i++; } i--; i2c_stop(); TWBR = twbrbackup; } } } void lcd_draw_char(unsigned char column, unsigned char page, unsigned char letter, uint8_t *buff){ uint8_t ascii_offset = 32; for(uint8_t i=0; i<5; i++){ buff[i+((page*128)+column)] = Ascii_1[letter-ascii_offset][i]; } } void lcd_draw_string(uint8_t column, uint8_t page, char *string, uint8_t *buff){ uint8_t i = 0; while(string[0] != 0){ lcd_draw_char(column+(5*i), page, (string[0]), buff); string++; i++; } }