// Purpose: Reads a byte of data from the specified chip
// Ouputs: A byte of data read from the chip
BYTE glcd_readByte(BYTE chip)
{
BYTE data; // Stores the data read from the LCD
if(chip == GLCD_CS1) // Choose which chip to read from
output_high(GLCD_CS1);
else
output_high(GLCD_CS2);
input_d(); // Set port d to input
output_high(GLCD_RW); // Set for reading
output_high(GLCD_E); // Pulse the enable pin
delay_us(2);
output_low(GLCD_E);
delay_us(2);
output_high(GLCD_E); // Pulse the enable pin
delay_us(2);
data = input_d(); // Get the data from the display's output register
output_low(GLCD_E);
output_low(GLCD_CS1); // Reset the chip select lines
output_low(GLCD_CS2);
return data; // Return the read data
}
void Busy()
{
int LCD_Busy;
delay_us(10); // debug
do
{
output_d(0);
output_high(LCD_RW);
output_high(LCD_CE);
LCD_Busy = (input_d()) & 0x80; // busy flag mask : bit7
output_low(LCD_CE);
} while (LCD_Busy);
delay_ms(2); // debug
output_low(LCD_CE);
output_low(LCD_RS);
output_low(LCD_RW);
}