And again this input value is converted into Analog to Digital value (0 to 1023) and this digital value is further mapped to (0 to 255) Similarly in Slave side we take analog input value at Arduino pin A0 from (0 to 5V) by using potentiometer. Then this input value is converted into Analog to Digital value (0 to 4096) and this digital value is further mapped to (0 to 255) as we can send only 8-bit (byte) data through SPI communication at once. 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.Īnalog input is taken at STM32F10C8 pin PA0 (0 to 3.3V) by rotating the potentiometer. In this STM32 SPI Example, we will use Arduino UNO as Slave and STM32F103C8 as Master with Two 16X2 LCD display attached to each other separately. It can be programmed using USB port without using FTDI programmer, to learn more about programming STM32 with Arduino IDE follow the link. The same library is used in programming STM32F103C8. The programming is similar to the Arduino code. Don’t forget to connect the Arduino GND and STM32F103C8 GND together.To Potentiometer Centre PIN for LCD contrast The table below shows the pins connected for Two LCD (16x2) with STM32F103C8 and Arduino separately. The Table Below shows the Pins Connected for STM32 SPI communication with Arduino. ESP32 Real Time Clock using DS3231 ModuleĬircuit Diagram and Connections for STM32 SPI Tutorial

Stem display master