由于1S的测量闸门时间在业余条件下不好测试,因此,实验程序中在LCD上同时显示实时时钟用于判断1S闸门时间的准确性。实验中,我使用CDMA手机上显示的GPS卫星精确时间进行比较。手机时间显示的最小单位是分钟,测量时一旦手机分钟值发生跳变,则立即记录下LCD显示的秒值,这样的话让频率计运行一段时间后,再多次记录下LCD显示的秒,就可以准确判断频率计的异步时钟是否准确。实验过程中,我让频率计走了10个小数左右,测量的1S时钟还是非常准确的。
#include
#include
#include lcd.h
#include 6x8.h
#include chinese.h
/*-----------------------------------------------------------------------
LCD_init : 3310LCD初始化
编写日期 :2004-8-10
最后修改日期 :2004-8-10
-----------------------------------------------------------------------*/
void LCD_init(void)
{
PORTB &= ~LCD_RST; // 产生一个让LCD复位的低电平脉冲
delay_1us();
PORTB |= LCD_RST;
PORTB &= ~LCD_CE ; // 关闭LCD
delay_1us();
PORTB |= LCD_CE; // 使能LCD
delay_1us();
LCD_write_byte(0x21, 0); // 使用扩展命令设置LCD模式
LCD_write_byte(0xc8, 0); // 设置偏置电压
LCD_write_byte(0x06, 0); // 温度校正
LCD_write_byte(0x13, 0); // 1:48
LCD_write_byte(0x20, 0); // 使用基本命令
LCD_clear(); // 清屏
LCD_write_byte(0x0c, 0); // 设定显示模式,正常显示
PORTB &= ~LCD_CE ; // 关闭LCD
//LCD_clear();
}
/*-----------------------------------------------------------------------
LCD_clear : LCD清屏函数
编写日期 :2004-8-10
最后修改日期 :2004-8-10
-----------------------------------------------------------------------*/
void LCD_clear(void)
{
unsigned int i;
LCD_write_byte(0x0c, 0);
LCD_write_byte(0x80, 0);
for (i=0; i<504; i++)
LCD_write_byte(0, 1);
}
/*-----------------------------------------------------------------------
LCD_set_XY : 设置LCD坐标函数
输入参数:X :0-83
Y :0-5
编写日期 :2004-8-10
最后修改日期 :2004-8-10
-----------------------------------------------------------------------*/
void LCD_set_XY(unsigned char X, unsigned char Y)
{
LCD_write_byte(0x40 | Y, 0); // column
LCD_write_byte(0x80 | X, 0); // row
}
/*-----------------------------------------------------------------------
LCD_write_char : 显示英文字符
输入参数:c :显示的字符;
编写日期 :2004-8-10
最后修改日期 :2004-8-10
-----------------------------------------------------------------------*/
void LCD_write_char(unsigned char c)
{
unsigned char line;
//c -= 32;
//for (line=0; line<6; line++)
//LCD_write_byte(font6x8[c][line], 1);
for (line=0; line<7; line++)
LCD_write_byte(font7x13[c][line], 1);
for (line=7; line<14; line++)
LCD_write_byte(font7x13[c][line], 1);
}
/*-----------------------------------------------------------------------
LCD_write_char : 英文字符串显示函数
输入参数:*s :英文字符串指针;
X、Y : 显示字符串的位置
编写日期 :2004-8-10
最后修改日期 :2004-8-10
-----------------------------------------------------------------------*/
void LCD_write_String(unsigned char X,unsigned char Y,char *s)
{
unsigned char line;
unsigned char i=0;
while (*s)
{
LCD_set_XY(X+i*7,Y);
for (line=0; line<7; line++)
LCD_write_byte(font7x13[*s-0X30][line], 1);
LCD_set_XY(X+i*7,Y+1);
for (line=7; line<14; line++)
LCD_write_byte(font7x13[*s-0X30][line], 1);
s++;
i++;
}
}
/*-----------------------------------------------------------------------
LCD_write_chi: 在LCD上显示汉字
输入参数:X、Y :显示汉字的起始X、Y坐标;
ch_with :汉字点阵的宽度
num :显示汉字的个数;
line :汉字点阵数组中的起始行数
row :汉字显示的行间距
编写日期 :2004-8-11
最后修改日期 :2004-8-12
-----------------------------------------------------------------------*/
void LCD_write_chi(unsigned char X, unsigned char Y,
unsigned char ch_with,unsigned char num,
unsigned char line,unsigned char row)
{
unsigned char i,n;
LCD_set_XY(X,Y); //设置初始位置
for (i=0;i{
for (n=0; n{
if (n==ch_with) //写汉字的下半部分
{
if (i==0) LCD_set_XY(X,Y+1);
else
LCD_set_XY((X+(ch_with+row)*i),Y+1);
}
LCD_write_byte(china_char[line+i][n],1);
}
i++;
LCD_set_XY((X+(ch_with+row)*i),Y);
}
}
/*-----------------------------------------------------------------------
LCD_write_chi: 汉字移动
输入参数:X、Y :显示汉字的起始X、Y坐标;
T :移动速度;
编写日期 :2004-8-13
最后修改日期 :2004-8-13
-----------------------------------------------------------------------*/
void LCD_move_chi (unsigned char X, unsigned char Y, unsigned char T)
{
unsigned char i,n,j=0;
unsigned char buffer_h[84]={0};
unsigned char buffer_l[84]={0};
for (i=0; i<156; i++)
{
buffer_h[83] = china_char[i/12][j];
buffer_l[83] = china_char[i/12][j+12];
j++;
if (j==12) j=0;
for (n=0; n<83; n++)
{
buffer_h[n]=buffer_h[n+1];
buffer_l[n]=buffer_l[n+1];
}
LCD_set_XY(X,Y);
for (n=0; n<83; n++)
{
LCD_write_byte(buffer_h[n],1);
}
LCD_set_XY(X,Y+1);
for (n=0; n<83; n++)
{
LCD_write_byte(buffer_l[n],1);
}
delay_nms(T);
}
}
/*-----------------------------------------------------------------------
LCD_draw_map : 位图绘制函数
输入参数:X、Y :位图绘制的起始X、Y坐标;
*map :位图点阵数据;
Pix_x :位图像素(长)
Pix_y :位图像素(宽)
编写日期 :2004-8-13
最后修改日期 :2004-8-13
-----------------------------------------------------------------------*/
void LCD_draw_map(unsigned char X,unsigned char Y,unsigned char *map,
unsigned char Pix_x,unsigned char Pix_y)
{
unsigned int i,n;
unsigned char row;
if (Pix_y%8==0) row=Pix_y/8; //计算位图所占行数
else
row=Pix_y/8+1;
for (n=0;n
{
LCD_set_XY(X,Y);
for(i=0; i{
LCD_write_byte(map[i+n*Pix_x], 1);
}
Y++; //换行
}
}
/*-----------------------------------------------------------------------
LCD_write_byte : 使用SPI接口写数据到LCD
输入参数:data :写入的数据;
command :写数据/命令选择;
编写日期 :2004-8-10
最后修改日期 :2004-8-13
-----------------------------------------------------------------------*/
void LCD_write_byte(unsigned char data, unsigned char command)
{
PORTB &= ~LCD_CE ; // 使能LCD
if (command == 0)
PORTB &= ~LCD_DC ; // 传送命令
else
PORTB |= LCD_DC ; // 传送数据
SPDR = data; // 传送数据到SPI寄存器
while ((SPSR & 0x80) == 0); // 等待数据传送完毕
PORTB |= LCD_CE ; // 关闭LCD
}