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US2066 OLED I2C Driver 04x20 - NHD-0420CW-AB3

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daveh

Joined: 30 Aug 2013
Posts: 19

US2066 OLED I2C Driver 04x20 - NHD-0420CW-AB3

Posted: Mon Dec 05, 2022 11:02 am

The following is code to initialize and use the US2066 OLED display driver using I2C. Code tested on NewHaven Display NHD-0420CW-AB3 display.

Code:

#include <33EP512MC504.h>
#FUSES NOWDT //No Watch Dog Timer (must be off to control from firmware)
#FUSES NOJTAG //JTAG disabled
#FUSES CKSFSM //Clock Switching is enabled, fail Safe clock monitor is enabled
#FUSES PROTECT
#FUSES FRC_PLL
#build (stack=1024)
#use delay(internal=40MHz)
#include <STDLIB.H> // for rand()

// PIN - DESCRIPTIONS
// 01 - Vss - 0v
// 02 - Vdd - 3.3v
// 03 - REGVdd - 0v
// 04 - SA0 - 0v - Changing to Vdd changes the address from 0x3C to 0x3D
// 05-06 - NC - 0v
// 07 - SCL - PIN_B4
// 08 - SDAin - PIN_A8
// 09 - SDAout - PIN_A8
// 10-15 - NC - 0v
// 16 - /RES - PORTB.10
// 17 - BS0 - 0v - I2C = BS:010
// 18 - BS1 - 3.3v
// 19 - BS2 - 0v
// 20 - Vss - 0v

#byte PORTB = 0xE12
#bit LCD_RES = PORTB.10 // /RES pin on LCD

// Define I2C Master Module - Hardware
#define i2c2_SCL PIN_B4
#define i2c2_SDA PIN_A8
#bit I2C2EN_BIT = 0x0216.15 // I2CEN bit to enable/disable hardware I2C module
#define i2cM_Baud 400000 // Primary baudrate for I2C
#use i2c(MASTER,STREAM=i2cM,I2C2,FAST=i2cM_Baud,FORCE_HW) // Master I2C module 2 read sensors MCP9600-100kHzMAX

#define NHD_0420CW_ADR 0x78 // if SA0=0 ADR=0x3C (0x78 shifted by 1), if SA0=1 ADR=0x3D (0x7A shifted by 1)
void initLCD_US2066(); // Initialize US2066 Display
void LCD_Data(int8 ByteVal);
void LCD_Command(int8 ByteVal);

void main() {
set_tris_a(0b1111101111100101);
set_tris_b(0b0100001011110011);
set_tris_c(0b1111111100110000);

initLCD_US2066();

printf(LCD_Data,"Hello World");
printf(LCD_Data,"\4Print on line4");
printf(LCD_Data,"\2 Print on line2");
printf(LCD_Data,"\3Random Number %u",rand());

while(true){
}
}

void initLCD_US2066(){
LCD_RES=1;
delay_ms(1);
// Initialization commands from NHD-0420CW-AB3 example code

LCD_Command(0x2A); //function set (extended command set) SET RE=1 IS=0
// IS=0 RE=1 SD=0 - EXTENDED
LCD_Command(0x71); //function selection A
LCD_Data(0x00); // disable internal VDD regulator (2.8V I/O). data(0x5C) = enable regulator (5V I/O)

LCD_Command(0x28); //function set (fundamental command set) SET RE=0 IS=0
// IS=0 RE=0 SD=0 - FUNDAMENTAL
LCD_Command(0x08); //display off, cursor off, blink off

LCD_Command(0x2A); //function set (extended command set) SET RE=1 IS=0
LCD_Command(0x79); //OLED command set enabled SET SD=1
// IS=0 RE=1 SD=1 - OLED
LCD_Command(0xD5); //set display clock divide ratio/oscillator frequency
LCD_Command(0x70); //set display clock divide ratio/oscillator frequency

LCD_Command(0x78); //OLED command set disabled SET SD=0
// IS=0 RE=1 SD=0 - EXTENDED
LCD_Command(0x09); //extended function set 3or4-lines display / 5-dot font width / disable inverting cursor /
LCD_Command(0x06); //COM SEG direction
LCD_Command(0x72); //function selection B
LCD_Data(0x08); //ROM CGRAM selection - Select ROM C

// LCD_Command(0x2A); //function set (extended command set) SET RE=1 IS=0 // not neeed, RE already set
LCD_Command(0x79); //OLED command set enabled SET SD=1
// IS=0 RE=1 SD=1 - OLED
LCD_Command(0xDA); //set SEG pins hardware configuration
LCD_Command(0x10); //set SEG pins hardware configuration
LCD_Command(0xDC); //function selection C
LCD_Command(0x00); //function selection C
LCD_Command(0x81); //set contrast control
LCD_Command(0x7F); //set contrast control
LCD_Command(0xD9); //set phase length
LCD_Command(0xF1); //set phase length
LCD_Command(0xDB); //set VCOMH deselect level
LCD_Command(0x40); //set VCOMH deselect level

LCD_Command(0x78); //OLED command set disabled SET SD=0
LCD_Command(0x28); //function set (fundamental command set) SET RE=0 IS=0
// IS=0 RE=0 SD=0 - FUNDAMENTAL
LCD_Command(0x01); //clear display
LCD_Command(0x02); //set DDRAM address to 0x00 'HOME'
LCD_Command(0x0C); //display ON

delay_ms(100);
}

void LCD_Data(int8 ByteVal){
switch (ByteVal)
{
case '\a' : // Home
LCD_Command(0x02); // Return Home
break;
case '\f' :
LCD_Command(0x01); // Clear Display
LCD_Command(0x02); // Return Home
break;
case '\n' :
LCD_Command(0xA0); // Goto Line2 (0x20 | 0b10000000)
break;
case '\2' :
LCD_Command(0xA0); // Goto Line2 (0x20 | 0b10000000)
break;
case '\3' :
LCD_Command(0xC0); // Goto Line3 (0x40 | 0b10000000)
break;
case '\4' :
LCD_Command(0xE0); // Goto Line4 (0x60 | 0b10000000)
break;

default :
i2c_start(i2cM);
i2c_write(i2cM,(NHD_0420CW_ADR)|0); // NHD-0420CW
i2c_write(i2cM,0x40);
i2c_write(i2cM,ByteVal);
i2c_stop(i2cM); // Restart
delay_us(20);
break;
}
}

void LCD_Command(int8 ByteVal){
i2c_start(i2cM);
i2c_write(i2cM,(NHD_0420CW_ADR)|0); // NHD-0420CW
i2c_write(i2cM,0x00);
i2c_write(i2cM,ByteVal);
i2c_stop(i2cM); // Restart
delay_us(20);
}

MartinOl

Joined: 10 Aug 2023
Posts: 1
Location: Prague, Czech Republic

It works with PIC16F also :)

Posted: Thu Aug 10, 2023 1:44 am

Hi. I used your code with small modifications for PIC16F18877 and it works well. Thank you very much. Just do not forget pull-up (approx. 4k7) resistors on the SDA and SCL.

Code:

#include <16F18877.h>
#device ADC=10

#use delay(internal=8000000,restart_wdt)
#use FIXED_IO( D_outputs=PIN_D1 )
#define LED PIN_D1
#define RES PIN_A0

#pin_select SDA1=PIN_C4
#pin_select SCL1=PIN_C3
#use i2c(Master,Slow,sda=PIN_C4,scl=PIN_C3,restart_wdt,force_hw)

// OLED PIN - DESCRIPTIONS
// 01 - Vss - 0v
// 02 - Vdd - 3.3v
// 03 - REGVdd - 0v
// 04 - SA0 - 0v - Changing to Vdd changes the address from 0x3C to 0x3D
// 05-06 - NC - 0v
// 07 - SCL - PIN_C3 with 4k7 pull-up resistor to 3V3
// 08 - SDAin - PIN_C4 with 4k7 pull-up resistor to 3V3
// 09 - SDAout - PIN_C4
// 10-15 - NC - 0v
// 16 - /RES - 3v3
// 17 - BS0 - 0v - I2C = BS:010
// 18 - BS1 - 3.3v
// 19 - BS2 - 0v
// 20 - Vss - 0v

#byte PORTB = 0xE12

#define NHD_0420CW_ADR 0x78 // if SA0=0 ADR=0x3C (0x78 shifted by 1), if SA0=1 ADR=0x3D (0x7A shifted by 1)
void initLCD_US2066(); // Initialize US2066 Display
void LCD_Data(int8 ByteVal);
void LCD_Command(int8 ByteVal);

void main() {
/*
set_tris_a(0b1111101111100101);
set_tris_b(0b0100001011110011);
set_tris_c(0b1111111100110000);
*/
initLCD_US2066();

printf(LCD_Data,"Hello World");
printf(LCD_Data,"\4Print on line4");
printf(LCD_Data,"\2Print on line2");
printf(LCD_Data,"\3Print on line3");

while(true){
}
}

void initLCD_US2066(){
output_high(RES);
delay_ms(1);
// Initialization commands from NHD-0420CW-AB3 example code

LCD_Command(0x2A); //function set (extended command set) SET RE=1 IS=0
// IS=0 RE=1 SD=0 - EXTENDED
LCD_Command(0x71); //function selection A
LCD_Data(0x00); // disable internal VDD regulator (2.8V I/O). data(0x5C) = enable regulator (5V I/O)

LCD_Command(0x28); //function set (fundamental command set) SET RE=0 IS=0
// IS=0 RE=0 SD=0 - FUNDAMENTAL
LCD_Command(0x08); //display off, cursor off, blink off

LCD_Command(0x2A); //function set (extended command set) SET RE=1 IS=0
LCD_Command(0x79); //OLED command set enabled SET SD=1
// IS=0 RE=1 SD=1 - OLED
LCD_Command(0xD5); //set display clock divide ratio/oscillator frequency
LCD_Command(0x70); //set display clock divide ratio/oscillator frequency

LCD_Command(0x78); //OLED command set disabled SET SD=0
// IS=0 RE=1 SD=0 - EXTENDED
LCD_Command(0x09); //extended function set 3or4-lines display / 5-dot font width / disable inverting cursor /
LCD_Command(0x06); //COM SEG direction
LCD_Command(0x72); //function selection B
LCD_Data(0x08); //ROM CGRAM selection - Select ROM C

// LCD_Command(0x2A); //function set (extended command set) SET RE=1 IS=0 // not neeed, RE already set
LCD_Command(0x79); //OLED command set enabled SET SD=1
// IS=0 RE=1 SD=1 - OLED
LCD_Command(0xDA); //set SEG pins hardware configuration
LCD_Command(0x10); //set SEG pins hardware configuration
LCD_Command(0xDC); //function selection C
LCD_Command(0x00); //function selection C
LCD_Command(0x81); //set contrast control
LCD_Command(0x7F); //set contrast control
LCD_Command(0xD9); //set phase length
LCD_Command(0xF1); //set phase length
LCD_Command(0xDB); //set VCOMH deselect level
LCD_Command(0x40); //set VCOMH deselect level

LCD_Command(0x78); //OLED command set disabled SET SD=0
LCD_Command(0x28); //function set (fundamental command set) SET RE=0 IS=0
// IS=0 RE=0 SD=0 - FUNDAMENTAL
LCD_Command(0x01); //clear display
LCD_Command(0x02); //set DDRAM address to 0x00 'HOME'
LCD_Command(0x0C); //display ON

delay_ms(100);
}

void LCD_Data(int8 ByteVal){
switch (ByteVal)
{
case '\a' : // Home
LCD_Command(0x02); // Return Home
break;
case '\f' :
LCD_Command(0x01); // Clear Display
LCD_Command(0x02); // Return Home
break;
case '\n' :
LCD_Command(0xA0); // Goto Line2 (0x20 | 0b10000000)
break;
case '\2' :
LCD_Command(0xA0); // Goto Line2 (0x20 | 0b10000000)
break;
case '\3' :
LCD_Command(0xC0); // Goto Line3 (0x40 | 0b10000000)
break;
case '\4' :
LCD_Command(0xE0); // Goto Line4 (0x60 | 0b10000000)
break;

default :
i2c_start();
i2c_write(NHD_0420CW_ADR|0); // NHD-0420CW
i2c_write(0x40);
i2c_write(ByteVal);
i2c_stop(); // Restart
delay_us(20);
break;
}
}

void LCD_Command(int8 ByteVal){
i2c_start();
i2c_write(NHD_0420CW_ADR|0); // NHD-0420CW
i2c_write(0x00);
i2c_write(ByteVal);
i2c_stop(); // Restart
delay_us(20);
}

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