The example shows connecting an RPi directly to an Arduino, which runs on 5V. So while an Atmega can run at 3.3, that doesn’t really address the issue here.

SPI transactions became officially part of Arduino SPI library some time ago. This happened after many months (most of 2014) of lengthy discussion and testing for these and MANY other details.

Arduino_SPI_bridge is a small Arduino project to configure an Arduino as USB<->SPI gateway. The main objective for this project was to provide a OS-independent SPI-gateway for the stm8gal application.

This is an SPI only library implementation for the MAX31855. This will only work on platforms with hardware SPI. The motivation behind this library is to keep it as small, fast and straight forward as ...

STM32 SPI Programming. The programming is similar to the Arduino code. The same <SPI.h> library is used in programming STM32F103C8. It can be programmed using USB port without using FTDI programmer, ...

Arduino enthusiasts or those looking to learn more about programming with Arduino and electronics-in-general may be interested in a new Kickstarter campaign and Arduino compatible 42-Digit SPI ...

Prestissimo Uno+ Arduino dev board with extra I2C UART SPI ADC IO and PWM channels. 2:24 pm November 5, 2018 By Julian Horsey.

I used Arduino Nano based on ATmega328P controller. Its performance isenough for our purpose. Small size and low cost - its advantage. Pinout diagram above shows the designations of Arduino Nano ...

Arduino MKR WAN 1310 LoRa Board Gets HW Security, Longer Battery Life and a 2MB SPI flash Two year ago Arduino launched MKR WAN 1300 board powered by Arduino Zero compatible Microchip Atmel SAMD21 ...