Raspberry Pi Zero W 0.91inch OLED

Raspberry Pi turns off SPI and I2C functions by default. If you write SPI programs, but the SPI module is not turned on, the following errors may occur:

ERROR: could not insert 'spi_bcm2708': No such device

The following is a simple explanation on how to open SPI function. Of course, it is the same to open other functions.

Input at terminal

sudo raspi-config

Command, and then operate according to the following sequence. After the configuration is completed, restart the raspberry pi to take effect.

If the SPI program runs with the following error

Unable to open SPI device: No such file or directory

It is possible that the SPI module was not imported successfully. Use the lsmod command to see whether the SPI module was successfully imported

If the words shown in the figure above appear, it indicates that the I2C and SPI modules are imported successfully. Otherwise, you can perform the configuration again and restart the system.

If the execution of I2C related procedures, the following errors occur

Unable to open I2C device: No such file or directory

You can see smod command i2c_bmc2708, but no i2c_dev, the following processing is required

sudo nano /etc/modules #Open files with nano

Then add
i2c_dev

Press Ctrl + X to exit editing, enter y to save the content, and then restart.

As shown in the figure below:

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Raspberry Pi Zero W 0.91inch OLED - RPI SPI and IIC User Guide

SIM8202G M2 3G/4G/5G/GNSS Sub-6G PCIe USB3.1 GPIO M.2 Moudle For LTE-A/NSA/SA For DFOTA /VoLTE For S