/*
NAME: | LCD_Init
PURPOSE: | Initializes the Butterfly's LCD for correct operation, ready to display data
ARGUMENTS: | None
RETURNS: | None
*/
void LCD_Init(void)
{
// Set the initial contrast level to maximum:
LCD_CONTRAST_LEVEL(0x0F);
// Select asynchronous clock source, enable all COM pins and enable all segment pins:
LCDCRB = (1<<LCDCS) | (3<<LCDMUX0) | (7<<LCDPM0);
// Set LCD prescaler to give a framerate of 64Hz:
LCDFRR = (0<<LCDPS0) | (3<<LCDCD0);
// Enable LCD and set low power waveform, enable start of frame interrupt:
LCDCRA = (1<<LCDEN) | (1<<LCDAB) | (1<<LCDIE);
}
/*
NAME: | SET_SetContrast (static)
PURPOSE: | Changes the LCD's contrast to the user's preference
ARGUMENTS: | None
RETURNS: | None
*/
void SET_SetContrast(void)
{
uint8_t Contrast = (eeprom_read_byte(&EEPROMVars.LCDContrast) & 0x0F); // Ranges from 0-15 so mask retuns 15 (darkest) on blank EEPROM (0xFF)
char Buffer[6];
JoyStatus = JOY_INVALID; // Use an invalid joystick value to force the program to write the
// name of the default command onto the LCD
for (;;)
{
if (JoyStatus)
{
if (JoyStatus & JOY_UP)
{
if (Contrast < 15)
Contrast++;
}
else if (JoyStatus & JOY_DOWN)
{
if (Contrast > 1) // Zero is non-visible, so 1 is the minimum
Contrast--;
}
else if (JoyStatus & JOY_LEFT)
{
eeprom_write_byte(&EEPROMVars.LCDContrast, Contrast);
return;
}
Buffer[0] = 'C';
Buffer[1] = 'T';
Buffer[2] = ' ';
MAIN_IntToStr((uint16_t)Contrast, &Buffer[3]);
LCD_PutStr(Buffer);
LCD_CONTRAST_LEVEL(Contrast);
MAIN_WaitForJoyRelease();
}
MAIN_MenuSleep();
}
}
