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- MPLAB XC8 LCD GRAPHIC DISPLAY GENERATOR
- MPLAB XC8 LCD GRAPHIC DISPLAY PRO
- MPLAB XC8 LCD GRAPHIC DISPLAY CODE
In the second read, the microcontroller can get the actual data. The first one is a dummy read during which the data is fetched from the display RAM is latched in to the output register of KS0108B.
MPLAB XC8 LCD GRAPHIC DISPLAY CODE
If you see the code for this subroutine, you will see there are two read operations involved. GLCD_Read() : Returns a byte read from the current display location. GLCD_Write() : Writes a byte of data to the current location. GOTO_XY() : Moves the cursor to specified row and column. GOTO_ROW() : Moves the cursor to specified row or page number (0-7). GOTO_COL() : Moves the cursor to specified column (0-127). It does not affect the data in the display RAM, it just scrolls the display up and down. You can set it to be any number between 0 to 63. Set_Start_Line() : This function changes the line number to be displayed at the top of the screen. Similarly the RS pin should be low too as the byte sent is an instruction. So, while sending this command, both CS1 and CS2 must be pulled low. This can be done by sending the command 3Fh to both the controllers. GLCD_ON() : This function turns the display on. Here’s a brief description of various user-defined function subroutines used in the code.
MPLAB XC8 LCD GRAPHIC DISPLAY PRO
I took most portion of it from Osama’s Lab GLCD library and modified it to suit with mikroC Pro for PIC and WDG0151-TMI GLCD. The code provided below generates 11 dotted horizontal lines on the GLCD screen with a six-line spacing between two. Later, we will explore the MikroElektronika’s GLCD library for more complex operations. Although, the compiler does provide built-in library routines for GLCD operations, we will first try to write our own test code for transferring display data from the PIC16F887 to the GLCD. We will be writing our test program in C using MikroElektronika’s mikroC Pro for PIC compiler. A fixed resistor value must be connected in series with the back-light LED (pins 19 and 20) to limit the current. The R/W and E pins have similar functions as in a HD44780 based character LCD module. The 8-bit data fed to D0-D7 pins of the GLCD is received by the LCD controller chip as an instruction if D/I = 0, and as data if D/I is 1. Pin number 6 is Data/Instruction (also called Register Select, RS) select pin.
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That’s why I said reading manufacturer’s datasheet is very important. The WDG0151-TMI module operates at 5.0 V power supply. They are active low in a WDG0151-TMI module, but they could be active high in some other models.
![mplab xc8 lcd graphic display mplab xc8 lcd graphic display](https://www.studentcompanion.net/en/wp-content/uploads/sites/3/2016/06/LCD.jpg)
The first two pins (1 and 2) are the chip select pins for the left and right display controller. The following table shows the pin descriptions of Winstar WDG0151-TMI module. An external potentiometer (usually 10 K) is connected between Vcc and V EE pins to set the LCD working voltage (contrast) at Vo pin. The pin diagrams of KS0108 based GLCDs is not standardized and it is therefore, important to read the manufacturer’s datasheet for correct wiring of a GLCD module.
MPLAB XC8 LCD GRAPHIC DISPLAY GENERATOR
The Winstar WDG0151-TMI module does have an internal negative voltage generator circuit which provides a negative voltage at V EE external pin. The total amount of bytes needed for a complete display frame (128×64 pixels) is, therefore, 2 * 64 pixels * 8 bits = 1024 bytes. The next 8 lines can be plotted similarly by switching to page address 1. If you repeat this 64 times, then switch to the second half, and repeat until 128th position is reached, the first 8 display lines will be plotted. Starting from page 0 on the left half (/CS1 = 0) if you transmit one data byte, it will appear on the first column of page 0.