Code: Select all
#include <avr/io.h>
#include <avr/interrupt.h>
#define BAUD 9600
#define SYSUBRR (F_CPU/16/BAUD-1)
#define BUF_SIZE 64
unsigned char txBuffer[BUF_SIZE]= " Poopy head I am the greatest";
unsigned char txBufferIndex;
// Function Declaration
void initUsart(void);
void initUsartTimer(void);
void SendUsart(unsigned char);
// ISR
void udreIsr(void);
ISR(USART1_UDRE_vect)
{
udreIsr();
}
// Main Program
int main(void)
{
OSCCAL = 0xC5; // my particular 8MHz factory calibration.
initUsart();
sei();
while(1)
{
//Loop forever
}
}
void initUsart()
{
// Setting some TxBuffer Values
//Set Baud Rate
UBRR1H = (unsigned char)(SYSUBRR>>8);
UBRR1L= (unsigned char)SYSUBRR;
//Enable Tx and Rx
UCSR1B |=(1<<TXEN1)|(1<<RXEN1);
//Set Frame format : 8data, 1 stop bit, no parity
UCSR1C=(3<<UCSZ10);
// Set Interrupt for data register empty
txBufferIndex=0;
UCSR1B |=(1<<UDRIE1);
}
void initUsartTimer()
{
}
void SendUsart(unsigned char data)
{
/* Wait for empty transmit buffer */
// while ( !( UCSR1A & (1<<UDRE1)) )
// Put data into Buffer and send the data
UDR1 = data;
}
void udreIsr()
{
if(txBuffer[txBufferIndex] != '\0')
{
SendUsart(txBuffer[txBufferIndex++]);
}
else
{
UCSR1B ^= (1<<UDRIE1);
}
}
Yes, this is how you power the display. Please see page 6 of the manual regarding the 4 pin connector (marked #5).Would I be able to connect the power through the 4 pin headers
Yes, you can just use the 4 pin connector for power and gnd, and use the DB9 for RS232 communication, but please make sure you use a NULL serial cable to connect your STK500 to the display.And for serial transfers, I'm not using the 4 pin header but using the RS232 port on the back of the LCD to a serial port on my ATMega development board STK500.
There should be 2 fonts pre-uploaded on the display.Also, reading the troubleshooting area in the LCD manual for no text being shown. It mentions about uploading fonts onto the LCD, are defaults font already on the board?
