I have installed a LCD screen that use my SPI0 bus and I2C but i want to connect my RFID reader to the same raspberry. My lcd screen can you see here: https://www.adafruit.com/product/1601

SPI1 will not be enabled with SPI0, i have searched for Enable SPI1 for raspberry Or Raspberry SPI1... But must results is links to enable SPI0 or SPI1 for python or SPI0 for c++

I want to use C++ as programming language. (you may send me C libarys but not Python)

This is the content of the raspberry file /boot/config.txt


Please tell me step step-by-step how you install SPI1 with SPI0 with C++

Can anybody help me please? Thank you. If you have the same problem please vote me. If you fix how i can enable the SPI and wich libary support SPI1 on C++ or C then you figured out my problem.

Added: Raspbian information:

pi@raspberrypi:~ $ uname -a
Linux raspberrypi 4.9.52-v7+ #1038 SMP Fri Sep 29 16:26:52 BST 2017 armv7l GNU/Linux
pi@raspberrypi:~ $ cat /etc/os-release
PRETTY_NAME="Raspbian GNU/Linux 9 (stretch)"
NAME="Raspbian GNU/Linux"
VERSION="9 (stretch)"
pi@raspberrypi:~ $
  • Are you using Raspbian? What does uname -a report? What does cat /etc/os-release report. Edit the answers into your question. – joan Oct 4 '17 at 17:51
  • 1
    All you need to do is have the line dtparam=spi=on in /boot/config.txt. I suspect the set-up for your LCD screen is claiming both SPI channels by mistake. You could test by removing whatever you are using to set-up the LCD screen and seeing if the SPI devices then appear. – joan Oct 4 '17 at 20:12
  • OK I go try it. – SmileDeveloper Oct 5 '17 at 7:50
  • Okay, But i want that the LCD screen and RFID reader is working. So i want to use SPI1. Not only LCD screen or RFID reader – SmileDeveloper Oct 5 '17 at 9:42
  • if i go try with bcm2835 to connect to my rfid reader the lcd screen turns off. – SmileDeveloper Oct 5 '17 at 9:44

In order to use the spi1 port of the Raspberry Pi, you need to set the dtoverlay=spi1-1cs in /boot/config.txt. By default this will use the pins (https://pinout.xyz/pinout/spi):

  • MOSI - pin 38
  • MISO - pin 35
  • CE0 - pin 12
  • CLK - pin 40

You can change the CE0 pin (e.g. to pin 23) by adding ,cs0_pin=23 to the overlay. See /boot/overlays/README for more info.

  • It seems that cs0_pin can be any unused GPIO pin. It expects BCM numbers only. source – Neal Ehardt Jan 22 at 2:43

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