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Added "Interface modifications" section to readme

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Kristian Lauszus 2014-07-01 11:31:45 +02:00
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@ -253,6 +253,26 @@ More information about the controller can be found at the following sites:
* http://www.developerfusion.com/article/84338/making-usb-c-friendly/
* https://github.com/torvalds/linux/blob/master/drivers/hid/hid-sony.c
# Interface modifications
The shield is using SPI for communicating with the MAX3421E USB host controller. It uses the SCK, MISO and MOSI pins via the ICSP on your board.
Furthermore it uses one pin as SS and one INT pin. These are by default located on pin 10 and 9 respectively. They can easily be reconfigured in case you need to use them for something else by cutting the jumper on the shield and then solder a wire from the pad to the new pin.
After that you need modify the following entry in [UsbCore.h](UsbCore.h):
```C++
typedef MAX3421e<P10, P9> MAX3421E;
```
For instance if you have rerouted SS to pin 7 it should read:
```C++
typedef MAX3421e<P7, P9> MAX3421E;
```
See the "Interface modifications" section in the [hardware manual](https://www.circuitsathome.com/usb-host-shield-hardware-manual) for more information.
# FAQ
> When I plug my device into the USB connector nothing happens?