Arduino for STM32

There are many STM32F103 CAN Bus libraries on github. Do a search and pick your favorite

I had a 128x64 OLED connected to PB10 / PB11 and the scanner displayed:
I2C device found at address 0x3C

If your STM32F103 board has a green LED, it is not the same one I have and that may explain your results.

^^ Interesting... Thanks for taking the time to put this together.

Here is an I2C scanner for the second I2C bus.
I have verified its function on my STM32F103 using I2C #2.


// --------------------------------------
// i2c_scanner
//
// Version 1
// This program (or code that looks like it)
// can be found in many places.
// For example on the Arduino.cc forum ...

What do you want to do?
Scan the second I2C bus, or use the second I2C bus?

The code above is a jumble of setting up the second I2C bus and scanning the first I2C bus.

The number of connections/wires needed is determined by the OLED display. The Adafruit ones have a dedicated connection for reset, (and may also have optional SPI) BUT the cheaper ones don't. I am using one of the cheaper ones and it has 4 connections: ground, Vcc, SCL and SDA.

When you asked for a ...

The number of connections/wires needed is determined by the OLED display. The Adafruit ones have a dedicated connection for reset, (and may also have optional SPI) BUT the cheaper ones don't. I am using one of the cheaper ones and it has 4 connections: ground, Vcc, SCL and SDA.

When you asked for a ...

I look forward to seeing the performance comparison between the Pico, Uno/Nano, STM32F1, STM32F4, ESP 8266 and the ESP32.

I have resolved the errors and will post what I did in a new thread.
I think it may be useful to others see one method to how to get an Arduino library that uses SPI.something working on the STM32F1 SPI2 5 volt tolerant bus.

Once I have done the post, I will add the link here.

Hi,
When you say it worked on 5-6 programs , I assume you mean the board accepted 5 - different .bin files and flashed them and they booted (be it blink or what ever) but when you upload your code it wont function,
I assume then yes there is a conflict, i would start by putting serial.print right ...