From b26558bc1a494daef025b72bc6bc1f5121570021 Mon Sep 17 00:00:00 2001 From: Dhiru Kholia Date: Sat, 26 Mar 2022 19:58:03 +0530 Subject: [PATCH] Add OLED I2C display example --- .../TinyWire/examples/i2c_oled/i2c_oled.ino | 202 ++++++++++++++++++ 1 file changed, 202 insertions(+) create mode 100644 avr/libraries/TinyWire/examples/i2c_oled/i2c_oled.ino diff --git a/avr/libraries/TinyWire/examples/i2c_oled/i2c_oled.ino b/avr/libraries/TinyWire/examples/i2c_oled/i2c_oled.ino new file mode 100644 index 00000000..1e4c6321 --- /dev/null +++ b/avr/libraries/TinyWire/examples/i2c_oled/i2c_oled.ino @@ -0,0 +1,202 @@ +/***********************************************************************| +| TinyWSoftware i2c master library for ATtiny13 | +| | +| i2c_oled.ino (by Dhiru Kholia - VU3CER) | +| | +| Based on https://github.com/wagiminator/ATtiny13-TinyOLEDdemo (by | +| Stefan Wagner - wagiminator) | +| | +| In this example we drive a 0.96" OLED Display Module over I2C. | +| | +| SERIAL REMINDER | +| The baud rate is ignored on the ATtiny13 due to using a simplified | +| serial. The baud rate used is dependent on the processor speed. | +| Note that you can specify a custom baud rate if the following ones | +| does not fit your application. | +| | +| THESE CLOCKS USES 115200 BAUD: THIS CLOCK USES 57600 BAUD: | +| 20 MHz, 16 MHz, 9.6 MHz, 8 MHz 4.8 MHz | +| THESE CLOCKS USES 19200 BAUD: THIS CLOCK USES 9600 BAUD: | +| 1.2 MHz, 1 MHz 600 KHz | +| | +| If you get garbage output: | +| 1. Check baud rate as above | +| 2. Check if you have anything else connected to TX/RX like an LED | +| 3. Check OSCCAL (see MicroCore OSCCAL tuner example) | +|***********************************************************************/ + +#include + +// We have to define which pins to use for SDA and SCL +const uint8_t TinyWire::SCL = 3; +const uint8_t TinyWire::SDA = 4; + +// Sets the i2c clock speed in [Hz] +// Use MAX_SPEED for the highest possible clock speed +const uint32_t TinyWire::FREQ = 100000; + +// OLED definitions +#define OLED_ADDR 0x3C // OLED write address - for '0.96" OLED Display Module' +#define OLED_CMD_MODE 0x00 // set command mode +#define OLED_DAT_MODE 0x40 // set data mode +#define OLED_INIT_LEN 14 // 12: no screen flip, 14: screen flip + +// OLED init settings +const uint8_t OLED_INIT_CMD[] PROGMEM = { + 0xA8, 0x1F, // set multiplex (HEIGHT-1): 0x1F for 128x32, 0x3F for 128x64 + 0x22, 0x00, 0x03, // set min and max page + 0x20, 0x00, // set horizontal memory addressing mode + 0xDA, 0x02, // set COM pins hardware configuration to sequential + 0x8D, 0x14, // enable charge pump + 0xAF, // switch on OLED + 0xA1, 0xC8 // flip the screen +}; + +// standard ASCII 5x8 font (adapted from Neven Boyanov and Stephen Denne) +const uint8_t OLED_FONT[] PROGMEM = { + 0x00, 0x00, 0x00, 0x00, 0x00, // 0 + 0x00, 0x00, 0x2f, 0x00, 0x00, // ! 1 + 0x00, 0x07, 0x00, 0x07, 0x00, // " 2 + 0x14, 0x7f, 0x14, 0x7f, 0x14, // # 3 + 0x24, 0x2a, 0x7f, 0x2a, 0x12, // $ 4 + 0x62, 0x64, 0x08, 0x13, 0x23, // % 5 + 0x36, 0x49, 0x55, 0x22, 0x50, // & 6 + 0x00, 0x05, 0x03, 0x00, 0x00, // ' 7 + 0x00, 0x1c, 0x22, 0x41, 0x00, // ( 8 + 0x00, 0x41, 0x22, 0x1c, 0x00, // ) 9 + 0x14, 0x08, 0x3E, 0x08, 0x14, // * 10 + 0x08, 0x08, 0x3E, 0x08, 0x08, // + 11 + 0x00, 0x00, 0xA0, 0x60, 0x00, // , 12 + 0x08, 0x08, 0x08, 0x08, 0x08, // - 13 + 0x00, 0x60, 0x60, 0x00, 0x00, // . 14 + 0x20, 0x10, 0x08, 0x04, 0x02, // / 15 + 0x3E, 0x51, 0x49, 0x45, 0x3E, // 0 16 + 0x00, 0x42, 0x7F, 0x40, 0x00, // 1 17 + 0x42, 0x61, 0x51, 0x49, 0x46, // 2 18 + 0x21, 0x41, 0x45, 0x4B, 0x31, // 3 19 + 0x18, 0x14, 0x12, 0x7F, 0x10, // 4 20 + 0x27, 0x45, 0x45, 0x45, 0x39, // 5 21 + 0x3C, 0x4A, 0x49, 0x49, 0x30, // 6 22 + 0x01, 0x71, 0x09, 0x05, 0x03, // 7 23 + 0x36, 0x49, 0x49, 0x49, 0x36, // 8 24 + 0x06, 0x49, 0x49, 0x29, 0x1E, // 9 25 + 0x00, 0x36, 0x36, 0x00, 0x00, // : 26 + 0x00, 0x56, 0x36, 0x00, 0x00, // ; 27 + 0x08, 0x14, 0x22, 0x41, 0x00, // < 28 + 0x14, 0x14, 0x14, 0x14, 0x14, // = 29 + 0x00, 0x41, 0x22, 0x14, 0x08, // > 30 + 0x02, 0x01, 0x51, 0x09, 0x06, // ? 31 + 0x32, 0x49, 0x59, 0x51, 0x3E, // @ 32 + 0x7C, 0x12, 0x11, 0x12, 0x7C, // A 33 + 0x7F, 0x49, 0x49, 0x49, 0x36, // B 34 + 0x3E, 0x41, 0x41, 0x41, 0x22, // C 35 + 0x7F, 0x41, 0x41, 0x22, 0x1C, // D 36 + 0x7F, 0x49, 0x49, 0x49, 0x41, // E 37 + 0x7F, 0x09, 0x09, 0x09, 0x01, // F 38 + 0x3E, 0x41, 0x49, 0x49, 0x7A, // G 39 + 0x7F, 0x08, 0x08, 0x08, 0x7F, // H 40 + 0x00, 0x41, 0x7F, 0x41, 0x00, // I 41 + 0x20, 0x40, 0x41, 0x3F, 0x01, // J 42 + 0x7F, 0x08, 0x14, 0x22, 0x41, // K 43 + 0x7F, 0x40, 0x40, 0x40, 0x40, // L 44 + 0x7F, 0x02, 0x0C, 0x02, 0x7F, // M 45 + 0x7F, 0x04, 0x08, 0x10, 0x7F, // N 46 + 0x3E, 0x41, 0x41, 0x41, 0x3E, // O 47 + 0x7F, 0x09, 0x09, 0x09, 0x06, // P 48 + 0x3E, 0x41, 0x51, 0x21, 0x5E, // Q 49 + 0x7F, 0x09, 0x19, 0x29, 0x46, // R 50 + 0x46, 0x49, 0x49, 0x49, 0x31, // S 51 + 0x01, 0x01, 0x7F, 0x01, 0x01, // T 52 + 0x3F, 0x40, 0x40, 0x40, 0x3F, // U 53 + 0x1F, 0x20, 0x40, 0x20, 0x1F, // V 54 + 0x3F, 0x40, 0x38, 0x40, 0x3F, // W 55 + 0x63, 0x14, 0x08, 0x14, 0x63, // X 56 + 0x07, 0x08, 0x70, 0x08, 0x07, // Y 57 + 0x61, 0x51, 0x49, 0x45, 0x43, // Z 58 + 0x00, 0x7F, 0x41, 0x41, 0x00, // [ 59 + 0x02, 0x04, 0x08, 0x10, 0x20, // \ 60 + 0x00, 0x41, 0x41, 0x7F, 0x00, // ] 61 + 0x04, 0x02, 0x01, 0x02, 0x04, // ^ 62 + 0x40, 0x40, 0x40, 0x40, 0x40 // _ 63 +}; + +// messages to print on OLED +const char Message1[] PROGMEM = "HELLO WORLD! :)"; + +// OLED init function +void OLED_init(void) { + Wire.beginTransmission(OLED_ADDR); + Wire.write(OLED_CMD_MODE); // set command mode + for (uint8_t i = 0; i < OLED_INIT_LEN; i++) + Wire.write(pgm_read_byte(&OLED_INIT_CMD[i])); // send the command bytes + Wire.endTransmission(); // initialize I2C first +} + +// OLED set vertical shift +void OLED_shift(uint8_t ypos) { + Wire.beginTransmission(OLED_ADDR); // start transmission to OLED + Wire.write(OLED_CMD_MODE); // set command mode + Wire.write(0xD3); // vertical shift command + Wire.write(ypos); // set vertical shift value + Wire.endTransmission(); // stop transmission +} + +// OLED print a character +void OLED_printC(char ch) { + uint16_t offset = ch - 32; // calculate position of character in font array + offset += offset << 2; // -> offset = (ch - 32) * 5 + Wire.write(0x00); // print spacing between characters + for (uint8_t i = 5; i; i--) + Wire.write(pgm_read_byte(&OLED_FONT[offset++])); // print character +} + +// OLED print a string from program memory +void OLED_printP(const char* p) { + Wire.beginTransmission(OLED_ADDR); // start transmission to OLED + Wire.write(OLED_DAT_MODE); // set data mode + char ch = pgm_read_byte(p); // read first character from program memory + while (ch != 0) { // repeat until string terminator + OLED_printC(ch); // print character on OLED + ch = pgm_read_byte(++p); // read next character + } + Wire.endTransmission(); // stop transmission +} + +// OLED set the cursor +void OLED_cursor(uint8_t xpos, uint8_t ypos) { + Wire.beginTransmission(OLED_ADDR); // start transmission to OLED + Wire.write(OLED_CMD_MODE); // set command mode + Wire.write(xpos & 0x0F); // set low nibble of start column + Wire.write(0x10 | (xpos >> 4)); // set high nibble of start column + Wire.write(0xB0 | (ypos & 0x07)); // set start page + Wire.endTransmission(); // stop transmission +} + +// OLED clear screen +void OLED_clear(void) { + OLED_cursor(0, 0); // set cursor at upper left corner + Wire.beginTransmission(OLED_ADDR); // start transmission to OLED + Wire.write(OLED_DAT_MODE); // set data mode + for (uint16_t i = 512; i; i--) + Wire.write(0x00); // clear the screen + Wire.endTransmission(); // stop transmission + OLED_shift(0); // reset vertical shift +} + +void setup() +{ + // No baudrate to select. See header for details + Serial.begin(); + Serial.println(F("Check your OLED screen ;)")); + OLED_init(); +} + +void loop() +{ + while (1) { + OLED_clear(); // clear screen + OLED_cursor(0, 0); // set cursor position + OLED_printP(Message1); // print message 1 + delay(5000); + } +}