16th August 2014 - (C) A.G.Doswell 2014 completed by Nicu FLORICA (niq_ro) - & */ // Date and time functions using a DS1307 RTC connected via I2C and Wire lib # include # include "RTClib. using the supplied color./* based on sketch from // Dawn & Dusk controller. Example 1: screen Chip Settings chip 16F1937,32 config MCLREON include define GLCDTYPE GLCDTYPEST7920 define GLCDIO 8 define GLCDWIDTH 128 define GLCDHEIGHT 160 define GLCDFontWidth 6 read delay of 25 is required at 32mhz, this can be reduced to 0 for slower clock speeds define ST7920ReadDelay 25 write delay of 2 is. Send the buffer to the display with ndBuffer (). You will get results, and print on graphical LCD, as given below. Don’t worry, it can display also the English alphabet with 8×16 characters.
ST7920 is a chip manufactured by Sitronix and has support for Chinese alphabet. Result: After Arduino programming using the given code, connect graphical LCD to Arduino and supply Arduino as per circuit diagram. When you start writing your own code/library for a device, the first place to look is the device datasheet. Draw something with the usual draw commands. And uncomment the line that is related to the specific LCD settings (ex. * Example interface to function that fills a given rect. For example: U8G2ST7920128X64FSWSPI (rotation, clock, data, cs, reset) Usage Clear the buffer with u8g2.clearBuffer (). This allows for easier draw loops by either shifting the data byte to the right and checking the lowest bit in a loop or by using the for loop variable as a bit index as shown below.
The lowest bit of the data byte is the first pixel to draw. If the bit is set, the corresponding pixel shall be drawn. The second function takes three uint8_t values as a parameter and is called when one byte of data shall be drawn on the display, e.g.: void drawByte(uint8_t x, uint8_t y, uint8_t d)Įach bit in the data byte to draw represents one pixel of the ST7920. The first function has no argument and is called when the display area of the ST7920 shall be cleared, e.g.: void clearDisplay(void) These pins are used to control jhd12864e graphical lcd. First the header file reg51.h is included(it is to be included in every project made in keil for 8051 microcontroller).
#ST7920 CODE EXAMPLE SOFTWARE#
The constructor of the emulator takes two functions as a parameter. it is written in c language using keil uvision 3 software to compile and create hex code. Seperate RAM sections for DDRAM and GDRAM which enables realistic representation of the interaction of both display data sources.Here we discuss the wiring of a ST7920 based 128×64 graphical 12864B LCD breakout display.
#ST7920 CODE EXAMPLE SERIAL#
This library has no external dependencies as both data I/O of the serial data and the controlling of an external display is done by external code. The payoff is presentation with considerable flexibility thanks to the existence of built-in characters and, in software for the Arduino, an extensive u8g graphics library, i.e., the same library that supports display of graphics on OLED displays. Have a opinion, suggestion, question or feedback about the article let.
#ST7920 CODE EXAMPLE DOWNLOAD#
Download the complete project folder from the below link: Hardware design Files and Code Library.
The ST7920Emulator is a platform independent emulator library that parses ST7920 serial data and draws the calculated display contents using user a supplied function. Below is the sample code for displaying HELLO WORLD on two different pages of GLCD.
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