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Shin

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Posts posted by Shin

  2. Posted

    Hello @tooz

    Is it possible to combine SPI/I2C control with python-periphery and GPIO control with console?
    GPIO is assigned to the CE pin of SPI. Therefore, I need to set up the order of SPI reading and GPIO control, and I want to control SPI and GPIO with the same software.

  3. Posted

    hello @tooz

    I installed WiringPi using the method you provided. However, the problem was not resolved.
    I have already installed the latest Linux(debian 11 v.3.0.18 kernel 5.10). 

    linaro@linaro-alip:/usr/local/share/gpio_lib_c_rk3399$ sudo ./build clean
wiringPi:   [Clean]
DevLib:     [Clean]
gpio:       [Clean]
Examples:   [Clean]
Gertboard:  [Clean]
PiFace:     [Clean]
Quick2Wire: [Clean]
PiGlow:     [Clean]
linaro@linaro-alip:/usr/local/share/gpio_lib_c_rk3399$ sudo ./build uninstall
wiringPi: [UnInstall]
DevLib:   [UnInstall]
gpio:     [UnInstall]
linaro@linaro-alip:/usr/local/share/gpio_lib_c_rk3399$ sudo ./build
wiringPi Build script
=====================


WiringPi Library
[UnInstall]
Rockchip
Rockchip
[Compile] wiringPi.c
[Compile] wiringTB.c
[Compile] wiringSerial.c
[Compile] wiringShift.c
[Compile] piHiPri.c
[Compile] piThread.c
[Compile] wiringPiSPI.c
[Compile] wiringPiI2C.c
[Compile] softPwm.c
[Compile] softTone.c
[Compile] mcp23008.c
[Compile] mcp23016.c
[Compile] mcp23017.c
[Compile] mcp23s08.c
[Compile] mcp23s17.c
[Compile] sr595.c
[Compile] pcf8574.c
[Compile] pcf8591.c
[Compile] mcp3002.c
[Compile] mcp3004.c
[Compile] mcp4802.c
[Compile] mcp3422.c
[Compile] max31855.c
[Compile] max5322.c
[Compile] sn3218.c
[Compile] drcSerial.c
[Compile] wpiExtensions.c
[Link (Dynamic)]
[Install Headers]
[Install Dynamic Lib]

WiringPi Devices Library
[UnInstall]
[Compile] ds1302.c
[Compile] maxdetect.c
[Compile] piNes.c
[Compile] gertboard.c
[Compile] piFace.c
[Compile] lcd128x64.c
[Compile] lcd.c
[Compile] piGlow.c
[Link (Dynamic)]
[Install Headers]
[Install Dynamic Lib]

GPIO Utility
[Compile] gpio.c
[Compile] readall.c
[Compile] pins.c
[Link]
[Install]

All Done.

NOTE: To compile programs with wiringPi, you need to add:
    -lwiringPi
  to your compile line(s) To use the Gertboard, MaxDetect, etc.
  code (the devLib), you need to also add:
    -lwiringPiDev
  to your compile line(s).

linaro@linaro-alip:/usr/local/share/gpio_lib_c_rk3399$ cd /home/linaro/Desktop/CSampleCode/spiSpeed/
linaro@linaro-alip:~/Desktop/CSampleCode/spiSpeed$ sudo gcc -o spiSpeed spiSpeed.c -lwiringPi -lpthread
linaro@linaro-alip:~/Desktop/CSampleCode/spiSpeed$ ls /dev/spidev*
/dev/spidev1.0  /dev/spidev5.0
linaro@linaro-alip:~/Desktop/CSampleCode/spiSpeed$ sudo ./spiSpeed 
+-------+--------+----------+----------+-----------+------------+
|   MHz |   Size | mS/Trans |      TpS |    Mb/Sec | Latency mS |
+-------+--------+----------+----------+-----------+------------+
Unable to open SPI device: No such file or directory

     

  5. Posted

    Hi,

    I am following the URL below to start up SPI with WiringPi library.

    I can see spidev in /dev on my TinkerBoard2S. Therefore, I believe the spi settings are reflected at boot time. 

    linaro@linaro-alip:~/Desktop/CSampleCode/spiSpeed$ ls /dev/spidev*
/dev/spidev1.0  /dev/spidev5.0

    When I run the sample code, I get an error "Unble to open SPI device". 
    Can you please tell me the cause and countermeasure? 

    linaro@linaro-alip:~$ cd /home/linaro/Desktop/CSampleCode/spiSpeed/
linaro@linaro-alip:~/Desktop/CSampleCode/spiSpeed$ sudo ./spiSpeed 
+-------+--------+----------+----------+-----------+------------+
|   MHz |   Size | mS/Trans |      TpS |    Mb/Sec | Latency mS |
+-------+--------+----------+----------+-----------+------------+
Unable to open SPI device: No such file or directory

    Board:TinkerBoard2S

    Linux version:4.4.194

     

    Best regards,

     

  6. Posted

    Thank you for your reply, @tooz .

    I don't think this method allows for complex processing like in C programming. I would like to use GPIOs not only for turning them on and off, but also for various types of communication.
    Is there any way to control GPIO faster in C or Python (or other languages)?

  7. Posted

    Hi,

    I compared GPIO access speed between RaspberryPi4 and TinkerBoard2S.
    After setting GPIO1 to HIGH, I processed GPIO2 to LOW immediately. I observed the waveforms with an oscilloscope.
    As a result, TinkerBoard2S was much slower. I think TinkerBoard2S has better performance, but why?
    Please let me know if there is a way to access GPIO faster with TinkerBoard2S.

    Image_up.png

     

    The software are as follows.
    RaspberryPi4
    ・OS RaspberryPiOS 64bit
    ・C language with BCM2835 library

    TinkerBoard2S
    ・OS Deabian 64bit
    ・C language with WiringPi library

    best regards,

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