Realize I2C Communication Using Single Chip Microcomputer
I2C (Inter-Integrated Circuit) is one of the commonly used serial communication protocols, which is suitable for connecting multiple chips, sensors or modules. This article will introduce how to use I2C communication on the microcontroller, and give the corresponding source code.
I2C communication has two lines, namely SDA (Serial Data Line) and SCL (Serial Clock Line). Among them, SDA transmits data, and SCL transmits clock signal. To start a data transfer, the start bit is sent, followed by the device address, followed by the command or data. Finally, a stop bit is sent to terminate the data transmission.
In the microcontroller, it is necessary to use software to simulate the I2C bus. The following code demonstrates how to use the ATmega328P microcontroller to control the I2C bus to read the time information in the DS1307 real-time clock chip.
#include <avr/io.h>
#include <util/delay.h>
#define