AMC0802B LCD

acliffhay

I have a nifty little project I'm working on and thought it would be the perfect time to learn the Propeller. I found a decently priced little LCD that I would like to use instead of the serial lcd from Parallax due to size and cost. The C tutorials are pretty good but I am a little confused with SPI interfaces. I believe I can get the display initialized, but I can't figure out the best way to send the actual data to the display based on the datasheet. Do I send each individual character to the DDRAM address for its position in the display?

/*
Oriental Display - AMC0802B-SPI
*/

#include "simpletools.h"                          // Include simpletools lib

int lcd_csb = 6;                                  // Chip Select
int lcd_sid = 7;                                  // Data
int lcd_sclk = 8;                                 // Clock
int lcd_rs = 9;                                   // Register Select


     
int main()                                        // Main function
{
  pause(42);                                      // Wait at least 40ms
  
  high(lcd_csb);                                  // CS line high
  high(lcd_sclk);                                  // CLK line high
  low(lcd_csb);                                   // CS -> low start SPI
  
  pause(10);
                                                                //Initialize LCD
  shift_out(lcd_sid, lcd_sclk, MSBFIRST, 8, 0b00111000);       // Function Set - 8bit, 2 Line, 5x8
  pause(1);                                                   // Wait at least 100us
  shift_out(lcd_sid, lcd_sclk, MSBFIRST, 8, 0b00001100);       // Display On
  pause(1);                                                   // Wait at least 100us
  shift_out(lcd_sid, lcd_sclk, MSBFIRST, 8, 0b00000001);       // Clear Display
  pause(12);                                                  // Wait at least 10us
  shift_out(lcd_sid, lcd_sclk, MSBFIRST, 8, 0b00000100);       // Entry Mode Set
  pause(1);
    
  high(lcd_csb);                                        // CS -> high stop SPI
  pause(10);
  
                                                                //Send it a Character

  high(lcd_csb);                                  // CS line high
  high(lcd_sclk);                                  // CLK line high
  low(lcd_csb);                                   // CS -> low start SPI
  
  
  shift_out(lcd_sid, lcd_sclk, MSBFIRST, 8, 0b11000000); //Set DDRAM Address
  shift_out(lcd_sid, lcd_sclk, MSBFIRST, 8, 0b00010100); //Generate "A"
  
  
}

I have some experience with Stamps, but am completely new to the Propeller platform. I'm using SimpleIDE. I may have bitten off more than I can chew, but I tend to be a feet first kind of person.

Thanks!

Al

lanternfish

Hi Al

acliffhay wrote: »

Do I send each individual character to the DDRAM address for its position in the display?

Hi

In answer to your question about character placement - Yes.

The AMC0802B is HD44780 compatible and so any tutorials for the HD44780 will be very helpful. Unfortunately it has been a while since I needed to use an LCD so a bit rusty on the details.

Putting your code inside

...

formats it better (sometimes)

I tend to be a feet first kind of person

You are in good company. And in some ways it is the only way we get to find out how things work.

acliffhay

Thanks lanternfish!

That gives me enough to plug away. Thanks for the hints on posting code, as well.

Al