51单片机AT24C02怎么子节写入字符串类型
时间: 2023-08-03 08:08:33 浏览: 45
在51单片机上操作AT24C02,可以按照以下步骤进行子节写入字符串类型:
1. 定义一个字符串数组,例如:
```c
char str[] = "hello world";
```
2. 将字符串写入AT24C02的指定地址,可以使用I2C总线进行通信。需要注意的是,AT24C02的每个字节都有一个地址,因此需要将字符串拆分为若干个字节进行写入。
```c
#include <reg51.h>
#include <intrins.h>
#define SDA P2_1
#define SCL P2_0
void i2c_start()
{
SDA = 1;
_nop_();
SCL = 1;
_nop_();
SDA = 0;
_nop_();
SCL = 0;
_nop_();
}
void i2c_stop()
{
SDA = 0;
_nop_();
SCL = 1;
_nop_();
SDA = 1;
_nop_();
}
void i2c_write(unsigned char dat)
{
unsigned char i;
for (i = 0; i < 8; i++) {
SDA = dat & 0x80;
_nop_();
SCL = 1;
_nop_();
SCL = 0;
_nop_();
dat <<= 1;
}
SDA = 1;
_nop_();
SCL = 1;
_nop_();
SCL = 0;
_nop_();
}
void i2c_send_ack(bit ack)
{
SDA = !ack;
_nop_();
SCL = 1;
_nop_();
SCL = 0;
_nop_();
SDA = 1;
_nop_();
}
void at24c02_write(unsigned char address, unsigned char dat)
{
i2c_start();
i2c_write(0xa0);
i2c_send_ack(0);
i2c_write(address);
i2c_send_ack(0);
i2c_write(dat);
i2c_send_ack(0);
i2c_stop();
}
void at24c02_write_string(unsigned char address, char *str)
{
unsigned char i = 0;
while (str[i] != '\0') {
at24c02_write(address + i, str[i]);
i++;
}
at24c02_write(address + i, '\0');
}
```
3. 调用at24c02_write_string函数进行写入。例如,将字符串"hello world"写入AT24C02的地址0x00到0x0B:
```c
at24c02_write_string(0x00, "hello world");
```