How can I send large data transactions, messages greater than 64 bytes, using the Aardvark I2C/SPI Host Adapter?

Question from a customer: For a communication scenario, I am using the Aardvark Software API for data transactions. Here is the call that I am using: aa_i2c_write (handle, deviceAddress, AA_I”C_NO_FLAGS, numbytes, bufferin)

If I define numbytes=300, is there a limitation when sending data due to the buffer size of 64 bytes? In other words, I would like to know what is the maximum size of data (number of bytes) that the Aardvark I2C/SPI Host Adapter can process.

Response from Technical Support: For the Aardvark adapter, the buffer space is 64 bytes, and the maximum slave response is 64 bytes. However, the transactions can be much larger. Here are the details:

GPS data has been system integrated with UART for some time, an asynchronous system. With navigation becoming more prevalent in commercial products, as well as mobile robotic devices and the coming of self-driving vehicles, I2C is now being integrated with GPS signals.

These interfaces appear similar, both having two signal lines. Beyond that, their functionalities are very different.  Here are two key points:

We often get inquiries from our customers about what slave address to use in order to communicate with their I2C slave device. A lot of this confusion stems from the fact that different vendors follow different slave address conventions.

In this post we will clarify the slave address standard used by all Total Phase products and to help developers determine what slave address they should use.

Content

• 7-bit Addressing
• Reserved Addresses
• 8-bit Addresses
• 10-bit Addressing

 
The I2C specification from NXP (formerly Philips) actually specifies two different slave addressing schemes. Standard Mode I2C makes use of 7-bit addressing. 10-bit addressing was later added as an extension to standard mode I2C.

7-bit Addressing

In 7-bit addressing procedure, the slave address is transferred in the first byte after the Start condition. The first seven bits of the byte comprise the slave address. The eighth bit is the read/write flag where 0 indicates a write and 1 indicates a read.