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#define SYSTEM_CLK   (16000000L) #define ComputeBaud(baud)  (unsigned int)(((SYSTEM_CLK / 16) / (baud)) - 1) #define UBRRxH(baud)   (unsigned char)((ComputeBaud(baud)>>8)&0xFF) #define UBRRxL(baud)   (unsigned char)((ComputeBaud(baud))&0xFF) #define UART0_BAUD   9600  // PC   <-> AVR #include <stdio.h> #include <avr/interrupt.h> #include <util/delay.h> #include "clcd.h" unsigned int time_count = 0; unsigned char string_time[16]; unsigned char sec, min, hour = 0; void uart0_init(void) {  unsigned char dummy;  UBRR0H = UBRRxH(UART0_BAUD);  UBRR0L = UBRRxL(UART0_BAUD);  UCSR0A = 0x00;  // 1x  UCSR0B = 0x98;  // RxInt=EN  UCSR0C = 0x06;  // data 8bit  dummy  = UDR0;  // UDR0 clear } void init_Timer(void) {  TCNT0 = 0x06;  // Counter0 Start: 6  TCCR0 = 0x04;  // 64/16 = 4us  TIMSK = 0x01;  // TCNT0 EN } void init(void) {  // CLCD Display Setting  init_LCD();    // LCD Initialize // usart initialize  uart0_init(); // Timer Setting  init_Timer(); } // Timer0 Interrupt SIGNAL(SIG_OVERFLOW0) {  TCNT0 = 6; // 256-6 = 250 count = 1ms  if(++time_count == 1000) // at 1s  {   sec++;   if(sec==60)   {    sec = 0;    min++;    if(min==60)    {     min = 0;     hour++;     if(hour==24)     {      hour = 0;     }    }   }   time_count = 0;  } } // UART0 Rx ISR - AVR <- PC SIGNAL(SIG_UART0_RECV) {  unsigned char RxChar;  RxChar = UDR0;    switch(RxChar)  {   case 'h': // Keyboard 'h' hour+1   {    hour++;    if(hour==24)     hour = 0;    break;   }   case 'm': // Keyboard 'm' min+1   {    min++;break;    if(min==60)     min = 0;    break;   }  } } //------------------------------ Main Function -------------------------------- int main(void) {  cli();  //Interrupt Disable  init(); //Initialize  sei();  //Interrupt Enable  char string1[16] = "Digital Clock";  char string2[16] = "Set by UART0 h,m";  string_out(0x80, string1); // 출력문자열  string_out(0xC0, string2);  while(1)  {   sprintf(string2," TIME: %u%u:%u%u:%u%u ",hour/10,hour%10,min/10,min%10,sec/10,sec%10);   string_out(0xC0,string2);  } }

clcd.h

clock.c

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