LCD显示24小时单片机
时间: 2023-06-16 10:06:27 浏览: 42
要在LCD上显示24小时时间,需要使用单片机的时钟模块来获取当前的时间,并将其转换为可显示的格式,然后将其发送到LCD上。
以下是一个简单的示例代码,使用ATmega16单片机和LCD显示器来显示24小时时间:
```c
#include <avr/io.h>
#include <util/delay.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lcd.h"
#define F_CPU 8000000UL
#define BAUD 9600
#define MYUBRR F_CPU/16/BAUD-1
void USART_Init(unsigned int ubrr) {
UBRRH = (unsigned char)(ubrr >> 8);
UBRRL = (unsigned char)ubrr;
UCSRB = (1 << RXEN) | (1 << TXEN);
UCSRC = (1 << URSEL) | (1 << UCSZ1) | (1 << UCSZ0);
}
void USART_Transmit(unsigned char data) {
while (!(UCSRA & (1 << UDRE)));
UDR = data;
}
unsigned char USART_Receive(void) {
while (!(UCSRA & (1 << RXC)));
return UDR;
}
void USART_SendString(char *str) {
int i = 0;
while (str[i] != '\0') {
USART_Transmit(str[i]);
i++;
}
}
void RTC_Init() {
/* Set the prescaler to 1024 */
TCCR1B |= (1 << CS12) | (1 << CS10);
/* Enable overflow interrupt */
TIMSK |= (1 << TOIE1);
/* Enable global interrupts */
sei();
}
ISR(TIMER1_OVF_vect) {
/* Increment the timer counter */
TCNT1 += 62500;
}
int main(void) {
char time_string[9];
int hours, minutes, seconds;
/* Initialize the USART */
USART_Init(MYUBRR);
/* Initialize the LCD */
lcd_init(LCD_DISP_ON);
/* Initialize the RTC */
RTC_Init();
while (1) {
/* Get the current time */
hours = TCNT1 / 46875;
minutes = (TCNT1 % 46875) / 781;
seconds = ((TCNT1 % 46875) % 781) / 13;
/* Format the time string */
sprintf(time_string, "%02d:%02d:%02d", hours, minutes, seconds);
/* Display the time on the LCD */
lcd_gotoxy(0,0);
lcd_puts(time_string);
/* Send the time string to the serial port */
USART_SendString(time_string);
/* Wait for one second */
_delay_ms(1000);
}
return 0;
}
```
此代码使用了AVR单片机的USART模块来将时间字符串发送到串口,同时还使用了LCD模块来显示时间。要使用此代码,您需要在单片机上连接一个16x2字符LCD显示器,并将其连接到单片机的端口。