~~NOCACHE~~
~~NOTOC~~
===== SPI =====
\\
<WRAP round important 55%>This tutorial was tested on STKa6x BSP with Rev.0104 and BSP Rev.0105</WRAP>

SPI can be tested with **spidev_test** from the kernel sources.\\ 
[[https://www.kernel.org/doc/Documentation/spi/spidev_test.c]]\\
**spidev_test** is included by default in the BSP, you will find it under **/usr/bin/**.
\\
==== Testing spidev 0.1 ====

<wrap Round info 65%>spidev_test is a loopback test, to use it on the Starterkit put a bridge between the pins **X27_43 (SPI1.MOSI)** and **X27_44 (SPI1.MISO)**.</wrap>

To run spidev with /dev/spi0.1 you need to specify the device with -D parameter
<code>
root@MBa6x:cd /usr/bin
root@MBa6x:/usr/bin ./spidev_test -D /dev/spidev0.1
</code>


++++console output with open bridge:| 
<code>
root@MBa6x:/usr/bin ./spidev_test -D /dev/spidev0.1
spi mode: 0
bits per word: 8
max speed: 500000 Hz (500 KHz)

FF FF FF FF FF FF
FF FF FF FF FF FF
FF FF FF FF FF FF
FF FF FF FF FF FF
FF FF FF FF FF FF
FF FF FF FF FF FF
FF FF 
</code>
++++
++++ console output with closed bridge:| 
<code>
root@MBa6x:/usr/bin ./spidev_test -D /dev/spidev0.1
spi mode: 0
bits per word: 8
max speed: 500000 Hz (500 KHz)

FF FF FF FF FF FF
40 00 00 00 00 95
FF FF FF FF FF FF
FF FF FF FF FF FF
FF FF FF FF FF FF
DE AD BE EF BA AD
F0 0D
</code>
++++
==== Testing spidev 4.0 ====

<wrap Round info 65%>spidev_test is a loopback test, to use it on the starterkit put a bridge between the pins **X28_51 (ECSPI5.MIS0)** and **X28_53 (ECSPI5.MOSI)**.</wrap>

To run spidev with /dev/spi4.0 you need to specify the device with -D parameter 
<code>
root@MBa6x:cd /usr/bin
root@MBa6x:/usr/bin ./spidev_test -D /dev/spidev4.0
</code>
++++console output with open bridge:| 
<code>
root@MBa6x:/usr/bin ./spidev_test -D /dev/spidev4.0
spi mode: 0
bits per word: 8
max speed: 500000 Hz (500 KHz)

FF FF FF FF FF FF
FF FF FF FF FF FF
FF FF FF FF FF FF
FF FF FF FF FF FF
FF FF FF FF FF FF
FF FF FF FF FF FF
FF FF 
</code>
++++
++++ console output with closed bridge:| 
<code>
root@MBa6x:/usr/bin ./spidev_test -D /dev/spidev4.0
spi mode: 0
bits per word: 8
max speed: 500000 Hz (500 KHz)

FF FF FF FF FF FF
40 00 00 00 00 95
FF FF FF FF FF FF
FF FF FF FF FF FF
FF FF FF FF FF FF
DE AD BE EF BA AD
F0 0D
</code>
++++