OrangePi Zero3: 26pin SPI test

RU EN

Chapt 3. Instructions for use of Debian/Ubuntu Server and Xfce desktop system

Страница: 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122

Chapter 3 contents

3.18.3. 26pin SPI test

1) According to the schematic diagram of the 26pin interface, the available spi is spi 1

Img 3.113

2) The spi 1 is disabled by default in the Linux system and needs to be manually enabled before it can be used. The steps to open are as follows:

a. First run orangepi-config, normal users remember to add sudo permission

orangepi@orangepi:~$ sudo orangepi-config

b. Then select System

Img 3.114

c. Then select Hardware

Img 3.115

d. Then use the arrow keys on the keyboard to navigate to the position shown in the figure below, and then use the space to select spi1-cs1-spidev

Img 3.116

e. Then select 'Save' to save

Img 3.117

f. Then select 'Back'

Img 3.118

g. Then select 'Reboot' to restart the system to make the configuration take effect

Img 3.119

3) Then check whether there is a spidev1.1 device node in the Linux system. If it exists, it means that the configuration of SPI1 has taken effect

orangepi@orangepi:~$ ls /dev/spidev1*
/dev/spidev1.1

4) Do not short-circuit the mosi and miso pins of SPI1 first, the output result of running spidev_test is as follows, you can see that the data of TX and RX are inconsistent

orangepi@orangepi:~$ sudo spidev_test -v -D /dev/spidev1.1
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 | ................................

5) Then short the two pins of mosi (the 19th pin in the 26pin interface) and miso (the 21st pin in the 26pin interface) of SPI1, and then run the output of spidev_test as follows, you can see the sending and receiving same data

orangepi@orangepi:~$ sudo spidev_test -v -D /dev/spidev1.1
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 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 | ......@.... .................. .

< >