We now take a look at the TWI/I2C API responsible for data transfer. The header file https://github.com/zeuzoix/sardine/blob/master/twi.h[twi.h] has the prototype. We'll take a look at the arguments and their description now
We learned about the different registers available in the Atmel AVR microcontroller to program the TWI interface. In this section we'll go through the twi_init API and the initialization of the TWI interface.
So you want to program the TWI/I2C interface of the AVR. Well you'll need to read up about the registers used to control this interface.
In this post we'll take a look at implementing an I2C/TWI library which can be used with Atmel's AVR micro-controller.
In the first part we went through a brief introduction of the DS1307 chip. We know the DS1307 can be programmed via the I2C bus i.e SDA and SCL. Through I2C we should be able to address the registers of this chip and write and read data based on our application description.