SPI is included with the Adafruit_BBIO library. The following are the basics on how to use it.
You can import the SPI module:
You can import the SPI module:
from Adafruit_BBIO.SPI import SPI
Once you've imported it, you'll want to initialize the bus and device:
spi = SPI(0,0)
The BeagleBone Black (BBB) includes SPI0, as well as SPI1. SPI1 is currently not available by default as the HDMI interface is utilizing one of the pins.
Note: It is not possible to use SPI1 on the BeagleBone Black without disabling the HDMI interface.
There are four /dev/spidev* bus and device combinations available. They are available by executing the following code:
#import the library from Adafruit_BBIO.SPI import SPI #Only need to execute one of the following lines: #spi = SPI(bus, device) #/dev/spidev<bus>.<device> spi = SPI(0,0) #/dev/spidev1.0 spi = SPI(0,1) #/dev/spidev1.1 spi = SPI(1,0) #/dev/spidev2.0 spi = SPI(1,1) #/dev/spidev2.1
If you'd like to disable HDMI to access SPI1, you can add the following to your uEnv.txt file in the small FAT partition on your BBB:
mkdir /mnt/boot mount /dev/mmcblk0p1 /mnt/boot nano /mnt/boot/uEnv.txt #change contents of uEnv.txt to the following: optargs=quiet capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN
| PORT | CS0 | DO | DI | SCLK |
|---|---|---|---|---|
| SPI0 | P9_17 | P9_21 | P9_18 | P9_22 |
| SPI1 | P9_28 | P9_29 | P9_30 | P9_31 |
Page last edited July 17, 2013
Text editor powered by tinymce.
