AN2737

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1

This section describes how to perform basic IAP with the STM8 I²C peripheral. The STM8

device behaves like a standard I²C EEPROM slave which can communicate with any

master. In this application note, the Aardvark PC host adapter is used as the I²C master.

1.1

Hardware description

Figure 1 shows a typical hardware connection between the Aardvark host adapter as master

and the STM8 I²C peripheral as slave.

The Aardvark host adapter and the STM8 I²C are connected together via the data (SDA)

and clock (SCL) pins.

A 4.7 k

Ω pull-up resistor must be connected to both the SDA and SCL lines

Note:

If the STM8/128-EVAL board is used, the pull-up resistors are present by default.

Figure 1.

1.2

Firmware description

The current firmware is provided in the ZIP file attached to this AN.

It includes:

●

The I²C driver that supports all basic I²C communication.

●

●

STM8A and STM8S firmware libraries

The firmware uses 7-bit addressing mode which has been validated at 100 kHz and 400

register is used for read/write operation selection, the value 51h must be entered in the

Aardvark software.

R/W

SCL

SDA

USB

PC + Aardvark

software

Aardvark

host adapter

STM8 device

Flash program

memory and

Master

Slave

data EEPROM