Hi Raquel,
I have four connections to my LK204-25 (four jumper wires)
- One goes from my Atmega32 UART TXD pin to pin 3 of the LK204-25
- Another jumper wire is used to connect pin 5 of LK204-25 to ground
- Third jumper wire is used to connect pin 1 of power connector to 5.14 Volts
- And the fourth one is used to connect pin 4 of power connector to ground
I'm not sure if I am setting the contrast command correctly. I wanted to send the commands like
it is done with the example on the manual but I haven't been able to find the Zcomm serial library
so I went ahead and did it like it is shown on my code. Is this correct?
Do you
have any suggestions for a simpler way to sending commands to the LK204-25?
BY THE WAY I CAN NOW SEE BLACK BOXES ON LINES 1 AND 3 ONLY
My code is the following:
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <stdio.h>
int txbuffer[32];
void USART_Transmit( unsigned char data);
void USART_Transmit_Contrast(int);
void delay_ms(unsigned short ms);
int main (void)
{
int light_screen =0;
// USART initialization
// Communication Parameters: 8 Data, 1 Stop, No Parity
// USART Transmitter: On
// USART Mode: Asynchronous
// USART Baud rate: 19200
UCSRA=0x02;
UCSRB=0x08;
UCSRC=0x86;
UBRRH=0x00;
UBRRL=0x33;
USART_Transmit_Contrast(light_screen); // set contrast
USART_Transmit('A' );
}
void USART_Transmit( unsigned char data)
{
// Wait for empty buffer
while ( !( UCSRA & (1<<UDRE)) )
;
// Put data into buffer, sends the data
UDR = data;
}
void USART_Transmit_Contrast(int white_screen)
//void Contrast(int white_screen)
{
while (1)
{
int i;
txbuffer[0] = '2';
txbuffer[1] = '5';
txbuffer[2] = '4';
txbuffer[3] = ' ';
txbuffer[4] = '8';
txbuffer[5] = '0';
txbuffer[6] = ' ';
txbuffer[7] = '[';
txbuffer[8] = 'white_screen';
txbuffer[9] = ']';
//txbuffer[10] = ';';
for ( i=0 ; i<10 ; i++ )
{
USART_Transmit(txbuffer
);
delay_ms(500);
}
break;
};
}
void delay_ms(unsigned short ms)
{
unsigned short outer1, outer2;
outer1 = 50;
while (outer1) {
outer2 = 1000;
while (outer2) {
while ( ms ) ms--;
outer2--;
}
outer1--;
}
}