不知道哪位好心的人可以幫幫我
我真的做不出來
以下是用AVR做的
包含LCD module (LCD 可顯示兩行) 這個部分已經做出來了 一定正確
題目
按A開始計算時間從00:00.0開始 到99:59.9
再按一次A時間會停止 如時間跑到35:11.9時 按A會停在35:11.9再按一次A會從35:11.9 開始(都顯示在第一行)
按B 時間會停止在第二行 但第一行仍然在計時
按D 會把所有時間歸0 就是回到00:00.0的時間
以下是LCD module 的編程(一定正確的)
這個是LCD_Ddriver.c
#include <avr/io.h>
#include <util/delay.h>
#include "LCD_Driver.h"
//internal funciton prototypes
void LCD_init();
void LCD_cmd_nibble(char c);
void LCD_dat_nibble(char c);
/* to write the higer nibble of a command to LCD module */
void LCD_cmd_nibble(char c)
{
//output the higher nibble to LCD with RS=0,RD=0,EN=0
LCD_PORT = c & 0xF0;
LCD_PORT = LCD_PORT | (1<<EN);
_delay_us(1); //EN=1 for at least .5us
LCD_PORT = LCD_PORT & (~(1<<EN));
_delay_us(1); //at least 1us for each cycle
}
/* to write the higer nibble of a data byte to LCD module */
void LCD_dat_nibble(char c)
{
//output the higher nibble to LCD with RS=0,RD=0,EN=0
LCD_PORT = c & 0xF0;
LCD_PORT = LCD_PORT | (1<<RS); //for writing data
LCD_PORT = LCD_PORT | (1<<EN);
_delay_us(1); //EN=1 for at least .5us
LCD_PORT = LCD_PORT & (~(1<<EN));
_delay_us(1); //at least 1us for each cycle
}
/* to write a command to LCD module */
void LCD_command(char cmd)
{
LCD_cmd_nibble(cmd); //higher nibble
LCD_cmd_nibble(cmd<<4); //lower nibble
_delay_ms(2); //max cmd processing time: 1.64ms
}
/* to display a character in LCD module at the current position*/
void LCD_display(char character)
{
LCD_dat_nibble(character); //higher nibble
LCD_dat_nibble(character<<4); //lower nibble
_delay_us(50); //max data processing time: 40us
}
/* to initialize the LCD module */
void LCD_init()
{
_delay_ms(15);
LCD_DDR = 0xFF; //LCD port as output
LCD_cmd_nibble(0x30);//set the LCD module as 8-bit mode three times
_delay_ms(5);
LCD_cmd_nibble(0x30);
_delay_ms(5);
LCD_cmd_nibble(0x30);
_delay_ms(5);
LCD_cmd_nibble(0x20); //set the LCD module as 4-bit mode
_delay_ms(5);
//from now on the LCD module works as 4-bit mode
//write cmd as normal
LCD_command(0x28);//4-bit mode, 2-line dispay, 5x7 dot char font
LCD_command(0x08); //display OFF
LCD_command(0x01); //clear dispay
LCD_command(0x06); //cursor increment, no shift
LCD_command(0x0F); //dispay ON with cursor on and blinking
}
這個是LCD_Ddriver.h
#ifndef LCD_DRIVER_H
#define LCD_DRIVER_H
#define LCD_PORT PORTB
#define LCD_DDR DDRB
#define RS 0 //pin0
#define RD 1 //pin1
#define EN 2 //pin2
//pin3: unused
//pin4-pin7: 4-bit data bus
/****** LCD funciton prototypes *********/
void LCD_init(); //must be called before the LCD module is usable
void LCD_command(char cmd); //write a command to LCD module
void LCD_display(char ch); //display a character in LCD module
//at the current position set by LCD_command()
#endif
以下就是要做的主程式
我只會把一些字顯示在LCD上 但不會計時
以下就是顯示在LCD上的字的編程
#include <avr/io.h>
#include <util/delay.h>
#include "LCD_Driver.h"
int main()
{
char str[]="Hello, world!";
int i;
//initialize LCD module
LCD_init();
//write character to LCD to display
LCD_display('A');
//move cursor to 2nd line, 1st position and then display characters
LCD_command(0xC0);
i=0;
while(str[i])
{
LCD_display(str[i++]);
}
while(1);
return 0;
}
