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How to connect two STM32 boards using SPI?
This tutorial shows how to connect two STM32 boards using the SPI interface and exchange data between them. We will connect 2 STM32F4Discovery boards and use the STM32Cube HAL API to configure one board as an SPI master (generating the clock) and the other as an SPI slave (relying on the clock generated by the master).
How to connect a STM32 master board to visualgdb?
Before you begin, follow our basic STM32 SPI tutorial to get ensure that the SPI on your board works and your logic analyzer can capture and display the SPI signals. First we will create the project for the SPI master board. Start Visual Studio and open the VisualGDB Embedded Project Wizard: Select the ARM toolchain and choose your device.
How to create a SPI master and SPI slave?
We will connect 2 STM32F4Discovery boards and use the STM32Cube HAL API to configure one board as an SPI master (generating the clock) and the other as an SPI slave (relying on the clock generated by the master). We will then use a logic analyzer to look into the SPI signals and show how to avoid a common synchronization error.
How does SCK work on a STM32 board?
While the MOSI (Master Output/Slave Input) line is used to send a packet from master to slave, the MISO (Master Input/Slave Output) line is already echoing back the data from the previous packet. Click on the right arrow in the “SCK” signal to automatically jump to the next packet.
How to send a message over the STM32 interface?
Click “Finish” to generate the basic project and ensure it builds. Now we will modify the project to send a basic message over the STM32 SPI interface. First of all, locate the datasheet for your STM32 device and find the pins that can be used for SPI.
How are potentiometers connected to Arduino and STM32?
Two Potentiometers are also connected with STM32 (PA0) and Arduino (A0) to determine the sending values (0 to 255) from master to slave and slave to master by varying the potentiometer. Comparing SPI bus in Arduino & STM32F103C8 Blue Pill board, STM32 has 2 SPI bus in it while Arduino Uno has one SPI bus.