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en:general_information:tutorial:spi [2015/08/17 11:01] – liedmann | en:general_information:tutorial:spi [2022/08/04 15:02] (current) – external edit 127.0.0.1 | ||
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+ | ~~NOCACHE~~ | ||
+ | ~~NOTOC~~ | ||
===== SPI ===== | ===== SPI ===== | ||
\\ | \\ | ||
Line 5: | Line 7: | ||
SPI can be tested with **spidev_test** from the kernel sources.\\ | SPI can be tested with **spidev_test** from the kernel sources.\\ | ||
[[https:// | [[https:// | ||
- | You will find **spidev_test** in our BSP under **/ | + | **spidev_test** |
\\ | \\ | ||
==== Testing spidev 0.1 ==== | ==== Testing spidev 0.1 ==== | ||
- | spidev_test is a loopback test to use it on the starterkit please | + | <wrap Round info 65%>spidev_test is a loopback test, to use it on the Starterkit |
+ | To run spidev with /dev/spi0.1 you need to specify the device with -D parameter | ||
+ | < | ||
+ | root@MBa6x: | ||
+ | root@MBa6x:/ | ||
+ | </ | ||
+ | |||
+ | |||
+ | ++++console output with open bridge: | ||
+ | < | ||
+ | root@MBa6x:/ | ||
+ | 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 | ||
+ | </ | ||
+ | ++++ | ||
+ | ++++ console output with closed bridge: | ||
+ | < | ||
+ | root@MBa6x:/ | ||
+ | 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 | ||
+ | </ | ||
+ | ++++ | ||
+ | ==== Testing spidev 4.0 ==== | ||
+ | |||
+ | <wrap Round info 65%> | ||
+ | |||
+ | To run spidev with /dev/spi4.0 you need to specify the device with -D parameter | ||
+ | < | ||
+ | root@MBa6x: | ||
+ | root@MBa6x:/ | ||
+ | </ | ||
+ | ++++console output with open bridge: | ||
+ | < | ||
+ | root@MBa6x:/ | ||
+ | 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 | ||
+ | </ | ||
+ | ++++ | ||
+ | ++++ console output with closed bridge: | ||
+ | < | ||
+ | root@MBa6x:/ | ||
+ | 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 | ||
+ | </ | ||
+ | ++++ |