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root@orangepi:~# ls /dev/spi*
/dev/spidev0.0
2) Then compile the spidev_test test program
a. The compilation command for linux5.4 system is
root@orangepi:~/wiringOP/examples# make spidev_test
[CC] spidev_test.c
[link]
b. The compilation command for linux3.4 system is
root@orangepi:~/wiringOP/examples# make spidev_test_linux3_4
[CC] spidev_test.c
[link]
3) Do not short-circuit the mosi and miso pins of spi first, and the output result of
running spidev_test is as follows, you can see that the data sent and received are
inconsistent
a. The test commands and results of the linux5.4 system are
root@orangepi:~/wiringOP/examples# ./spidev_test -v -D /dev/spidev0.0
spi mode: 0x0
bits per word: 8
max speed: 500000 Hz (500 KHz)
TX | 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 F0 0D | ......@....▒..................▒.
RX | 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 | ................................
b. The test commands and results of the linux3.4 system are
root@orangepi:~/wiringOP/examples# ./spidev_test_linux3_4 -D /dev/spidev0.0
spi mode: 0
bits per word: 8
max speed: 500000 Hz (500 KHz)
00 00 00 00 00 00
00 00 00 00 00 00
00 00 00 00 00 00
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