9. Serial Peripheral Interface – SPI

Getting access to the SPI devices

As already stated in the previous section, there exist several SPI slaves, and since we have to choose one of them to present here, I decided to show you how to manage an LCD display.

I'm going to use the following tiny LCD display, which can be used in simple applications, because it's cheap and well supported by the BeagleBone Black's kernel:

Note

The device can be purchased at (or by surfing the Internet) http://www.cosino.io/product/color-tft-lcd-1-8-160x128.

First of all, we must do the electrical connections, so in the following table, I have reported the correspondence between the BeagleBone Black's pins and the LCD pins:

BeagleBone Black pins – label	LCD pins – label
P9.4 – VCC	9 – VCC
P9.29 – MISO	Not connected
P9.30 – MOSI	4 – MOSI
P9.31 – SCLK	3 – SCK
P9.28 – SS0	5 – TFT_CS
P9.25	7 – D/C
P9.27	8 – RESET
P8.19	1 – LITE
P9.2 – GND	10 – GND

You can note that we used the SPI dedicated pins, plus some GPIOs lines. This configuration...

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Beaglebone Essentials

By : Rodolfo Giometti

Beaglebone Essentials

By: Rodolfo Giometti

Overview of this book

Getting access to the SPI devices

Note

Beaglebone Essentials

By : Rodolfo Giometti

Beaglebone Essentials

By: Rodolfo Giometti

Overview of this book

Getting access to the SPI devices

Note

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