Getting Started

Chapter 11 The Butterfly LCD............................................................................

llmode is not used

id

olon(cha

0 dis n, otherwise ables n

ntrast(char

Uses the value of input from 0 to 15 to set the contrast

our messenger p at we can tr B to

e LCD. We will also add commands to set the contrast, show/hide the

r the display, set the flash rate, and send strings with flashing

haracters.

Instead of running off willy-nilly and writing software, lets start with a short
specification of what we want to test from the PC users perspective.

We will test each function by sending the following command strings to the
Butterfly:

• PUTCdigitcharacter to test LCD_putc(uint8_t digit, char character);
  o Send PUTCdigitcharacter where character is a char to be displayed
  and digit is the LCD segment to display the input on. For example
  PUTC6A will cause the character A to be displayed on the 6th LCD
  digit.
  o Verify function by seeing the correct char in the correct position


• PUTF to test LCD_puts_f(const char *pFlashStr, char scrollmode);
  o Verify function by seeing the correct string on the LCD


• PUTSstring to test LCD_puts(char *pStr, char scrollmode);
  o Send PUTSstring where string is a string to be displayed. For
  example PUTSHello World! will cause the LCD to display ‘Hello
  World!’.
  o Verify function by seeing the correct string on the LCD


• CLEAR to test LCD_Clear(void);

o scro

• void LCD_Clear(vo );
  o Clears the LCD


• void LCD_C r show);
  o If show = ables Colo en Colo


• char SetCo input);
  o

PC to LCD test program..............................................................................

Lets modify
y on th

rogram so th send s ings to the utterfly
displa
colon, clea
c