IIC总线读写程序

电源

利用定时器产生一个0~99秒变化的秒表，并且显示在数码管上，没过一秒将这个变化的数写入板上AT24C02内部。当关闭实验板电源，并再次打开实验板电源时，单片机先从AT24C02中将原来写入的数读取出来，接着此数继续变化并显示在数码管上。

#include
#define uchar unsigned char
#define uint unsigned int
bit write = 0;
***it sda = P0^1;
***it scl = P0^0;
***it wp = P0^2;
***it dula = P3^4;
***it wela = P3^5;
uchar sec, tcnt;
uchar code table[] = {
0x3f, 0x06, 0x5b, 0x4f,
0x66, 0x6d, 0x7d, 0x07,
0x7f, 0x6f, 0x77, 0x7c,
0x39, 0x5e, 0x79, 0x71};
void delay()
{;;}
void delay1ms(uint z)
{
uint x, y;
for(x=z; x>0; x--)
for(y=110; y>0; y--);
}
void start()
{
sda = 1;
delay();
scl = 1;
delay();
sda = 0;
delay();
}
void stop()
{
sda = 0;
delay();
scl = 1;
delay();
sda = 1;
delay();
}
void response()
{
uchar i;
scl = 1;
delay();
while((sda == 1) && (i<250)) i++;
scl = 0;
delay();
}
void init()
{
sda = 1;
delay();
scl = 1;
delay();
wp = 0;
}
void write_byte(uchar date)
{
uchar i, temp;
temp = date;
for(i=0; i<8; i++)
{
temp = temp << 1;
scl = 0;
delay();
sda = CY;
delay();
scl = 1;
delay();
}
scl = 0;
delay();
sda = 1;
delay();
}
uchar read_byte()
{
uchar i, k;
scl = 0;
delay();
sda = 1;
delay();
for(i=0; i<8; i++)
{
scl = 1;
delay();
k = (k<<1) | sda;
scl = 0;
delay();
}
return k;
}
void write_add(uchar address, uchar date)
{
start();
write_byte(0xae);
response();
write_byte(address);
response();
write_byte(date);
response();
stop();
}
uchar read_add(uchar address)
{
uchar date;
start();
write_byte(0xae);
response();
write_byte(address);
response();
start();
write_byte(0xaf);
response();
date = read_byte();
stop();
return date;
}
void display(uchar bai_c, uchar sh_c)
{
/* dula = 1;
P1 = table[bai_c];
dula = 0;
P1 = 0xff;
wela = 1;
P1 = 0xfe;
wela = 0;
delay1ms(5);
P1 = 0x00;
dula = 1;
dula = 0;
dula = 1;
P1 = table[sh_c];
dula = 0;
P1 = 0xff;
wela = 1;
P1 = 0xfd;
wela = 0;
delay1ms(5);
P1 = 0x00;
dula = 1;
dula = 0;*/
P1 = 0xff;
wela = 1;
P1 = 0xfe;
wela = 0;
P1 = 0x00;
dula = 1;
P1 = table[bai_c];
dula = 0;
delay1ms(5);
P1 = 0x00;
dula = 1;
dula = 0;
P1 = 0xff;
wela = 1;
P1 =0xfd;
wela = 0;
P1 = 0x00;
dula = 1;
P1 = table[sh_c];
dula = 0;
delay1ms(5);
P1 = 0x00;
dula = 1;
dula = 0;
}
void main()
{
init();
sec = read_add(2);
if(sec>100) sec = 0;
TMOD = 0x01;
EA = 1;
ET0 = 1;
TH0 = 15536/256;
TL0 = 15536%256;
TR0 = 1;
while(1)
{
display(sec/10, sec%10);
if(write == 1)
{
write = 0;
write_add(2, sec);
}
}
}
void t0() interrupt 1
{
TH0 = 15536/256;
TL0 = 15536%256;
tcnt++;
if(tcnt == 20)
{
tcnt = 0;
sec++;
write = 1;
if(sec == 100) sec = 0;
}
}

复制代码

陈厚合 · 2016-9-5 06:42:09

完整程序吗

曲终人散 · 2016-9-5 07:19:22

你这也不全呀

h1654155956.5608 · 2016-9-5 09:11:57

软件模拟的，移植方便。

电子工程师2014 · 2016-9-6 13:08:46

仿真一下

北雷神 · 2016-9-23 18:44:34

elecfans 发表于 2016-9-5 06:42
完整程序吗

是完整的，但要根据具体开发板修改一下。抱歉一直没回复，好久没有上过论坛了。

北雷神 · 2016-9-23 18:44:58

@曲终人散@ 发表于 2016-9-5 07:19
你这也不全呀

是完整的，但要根据具体开发板修改一下。抱歉一直没回复，好久没有上过论坛了。

woshistar · 2017-4-24 16:19:58

学习学习，谢谢分享

8^#

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9^#

提示: 该帖被管理员或版主屏蔽

龙傲天 · 2017-8-16 10:44:24

谢谢

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