AVR-ICSP Просмотр технического описания (PDF) - Unspecified

Номер в каталоге

Компоненты Описание

производитель

AVR-ICSP

Open-source hardware UEXT extension board with relays and USER’S MANUAL

Unspecified 

OLIMEX© 2015

MOD-IO user's manual

than others. This is perfectly normal for some chips – for instance – voltage regulators and the main

processor.

2.5 Changing the firmware

In order to change the firmware of MOD-IO you would need an ISP programmer or a JTAG

debugger. Such tools might be purchased from various sources including Olimex. If you are in

doubt whether a tool would work with MOD-IO you should ensure that:

1. the tool supports the main microcontroller AVR ATmega16A

and

2. the tool has either 10-pin JTAG connector or 10-pin ISP connector (or you would need to use

jumper wires or adapter)

As already mentioned in chapter “2.3 Software requirements” to edit the original firmware you

would need AVR Studio 4, since this is the integrated development environment we used. At some

point you might decide to add own keywords and behavior that suits your project better than what

we have done.

Of course, you can decide to completely skip this part and use the board as a general-purpose AVR

board. You can write own software or firmware from scratch.

2.5 Connecting more than one MOD-IO together

If you need more than 4 relays or more than 4 optocouplers you might connect another MOD-IO

board since each board has both male and female UEXT connectors and the communication

protocol is I2C – it allows multiple devices on the same bus – each addressed by a unique identifier.

You may plug the boards directly – the UEXT_FEMALE connector of the first MOD-IO would

plug in the UEXT_MALE connector of the second MODIO.

You can connect more than two boards this way.

Note that if you want to use more than one MOD-IO on the same I2C bus you would need to

change the built-in the firmware identifier. Each board needs a unique address. There is a command

to change discussed in the next chapter – “2.6 Default firmware description”.

2.6 Default firmware description

The demo is built-in each MOD-IO board. The source code might be found in the software section

at the product page at our web site. Direct link to the board's web-page:

https://www.olimex.com/Products/Modules/IO/MOD-IO/resources/MOD-IO.pdf

The archive with the sources contains a prebuilt binary which also might be used to restore the

initial functionality. The project was compiled with AVR studio 4 and WinAVR compiler (available

at sourceforge.net).

Page 9 of 30

Share Link: