TVI Electronics, LLC

Code: Select all

#include <mega16.h> 
#include <stdio.h> 

char uart_rx; 

void port_init(void) 
{ 
 PORTA = 0xFF; 
 DDRA  = 0xFF; 
 PORTB = 0xFF; 
 DDRB  = 0xFF; 
 PORTC = 0xFF; 
 DDRC  = 0xFF; 
 PORTD = 0xFF; 
 DDRD  = 0xFF; 
} 

//UART0 initialize 
// desired baud rate: 9600 
// actual: baud rate:9600 (0.0%) 
// char size: 8 bit 
// parity: Disabled 
void uart0_init(void) 
{ 
 UCSRB = 0x00; //disable while setting baud rate 
 UCSRA = 0x00; 
 UCSRC = 0x06; 
 UBRRL = 0x3B; //set baud rate lo 
 UBRRH = 0x00; //set baud rate hi 
 UCSRB = 0xD8; 
} 

#pragma interrupt_handler uart0_rx_isr:12 
void uart0_rx_isr(void) 
{ 
 //uart has received a character in UDR 
 uart_rx = getchar(); 
} 

#pragma interrupt_handler uart0_tx_isr:14 
void uart0_tx_isr(void) 
{ 
 //character has been transmitted 
} 

//call this routine to initialize all peripherals 
void init_devices(void) 
{ 
 //stop errant interrupts until set up 
 CLI(); //disable all interrupts 
 port_init(); 
 uart0_init(); 
 MCUCR = 0x00; 
 GICR  = 0x00; 
 TIMSK = 0x00; //timer interrupt sources 
 SEI(); //re-enable interrupts 
 //all peripherals are now initialized 
}

Code: Select all

/* uart_rx is a global 
use interrupt handler to update 
example    

#pragma interrupt_handler uart0_rx_isr:12 
void uart0_rx_isr(void) 
{ 
 //uart has received a character in UDR 
 uart_rx = getchar(); 
} 

don't forget to set up UART 
*/ 

// ***************************************************************************** 
void wait_for_response(void) 
{ 
 uart_rx = 0; 
 while(uart_rx == 0); 
} 
// ***************************************************************************** 
void clear_screen(void) 
{ 
 printf("%c",1); // clear screen 
 printf("%c",1); // clear screen 
 wait_for_response(); 
} 
// ***************************************************************************** 
void start_p_c(char page, char column) 
{ 
 printf("%c",6); // start page 
 printf("%c",page); // page number 
 printf("%c",18); // start column 
 printf("%c",column); // column number 
 wait_for_response(); 
} 
// ***************************************************************************** 
void line_draw(char start_x, char start_y, char stop_x, char stop_y) 
{ 
 printf("%c",30); //  line 
 printf("%c",0); // draw 
 printf("%c",start_x); // start x 
 printf("%c",start_y); // start y 
 printf("%c",stop_x); // stop x 
 printf("%c",stop_y); // stop y 
 wait_for_response(); 
} 
// ***************************************************************************** 
void rectangle_draw(char rectangle, char start_x, char start_y, char stop_x, char stop_y) 
{ 
 printf("%c",30); //  rectangle 
 printf("%c",rectangle); // draw 
 printf("%c",start_x); // start x 
 printf("%c",start_y); // start y 
 printf("%c",stop_x); // stop x 
 printf("%c",stop_y); // stop y 
 wait_for_response(); 
} 
// ***************************************************************************** 
void font_select(char font) 
{ 
 printf("%c",21); //  font select 
 printf("%c",font); //  font 
 wait_for_response(); 
} 
// ***************************************************************************** 
void print_font(char font) 
{ 
 printf("%c",2); //  text mode 
 printf("%c",font); //  font 
 wait_for_response(); 
} 
// ***************************************************************************** 
void hello(void) 
{ 
 char message[5]= {'H','e','l','l','o'}; 
 char i; 
 int k; 
 for(i=0;i<5;i++) 
   { 
    print_font(message[i]); 
   for(k=0;k<3000;k++); //delay 
   }  
} 
// ***************************************************************************** 
void main(void) 
{ 
 init_devices(); 
 uart_rx = 0; 
 clear_screen(); 
 line_draw(62,0,62,63); //line from 62,0 to 62,63 
 line_draw(63,0,63,63); //line from 63,0 to 63,63 
 line_draw(0,31,127,31); //line from 0,31 to 127,31 
 font_select(1); // 1 for font 5x7, 2 for font 8x14, 3 for font 8x14 Bold 
 start_p_c(1,5); // page,column 
 hello(); 
 font_select(2); // 1 for font 5x7, 2 for font 8x14, 3 for font 8x14 Bold 
 start_p_c(1,70); // page,column 
 hello(); 
 font_select(3); // 1 for font 5x7, 2 for font 8x14, 3 for font 8x14 Bold 
 start_p_c(5,5); // page,column 
 hello(); 
 start_p_c(5,70); // page,column 
 hello(); 
 rectangle_draw(3, 69, 40, 101, 55);// box, start_x, start_y, stop_x, stop_y 
}