Arduino for STM32

Thanks for the suggestion.
I did flash the HID bootloader (https://github.com/Serasidis/STM32_HID_Bootloader) for the STM32F103 using ST-Link 2 & STMCubeProgrammer at 0x8000000 before I loaded this program. I changed the required settings in the Arduino IDE and it worked great on 5-6 different ...

Update:
Before I changed the MCP_CAN_lib, I remapped the default SPI to use SPI2 pins, as it is 5 volt tolerant

SPI.setMOSI(PB15);
SPI.setMISO(PB14);
SPI.setSCLK(PB13);


AND IT WORKED! :)

Now the weird part:
Yesterday I started to use the WONDERFUL HID Bootloader (https://github.com ...

Thank you VERY much for your help!
I will try it later this morning.

I am working on using a MCP 2515 CAN Bus module on my STM32F103C8 generic board running the STM32duino core.
(Yes, I understand the STM32F103 has a built in CAN controller, but I also require USB)

I am using the (wonderful!) MCP_CAN-lib (https://github.com/coryjfowler/MCP_CAN_lib)
As I understand ...

Adding a 25ms delay right after StartUp() resolved the issue.
20ms was not enough, so I will add a buffer just in case temperature is an issue and use 100ms.
That is a long time to a uC, but the end user won't notice a slower boot up.

It looks like OLED controller might need more time to start then STM. Try adding delay before initializing display.
I also recommend u8g2 library. It's faster than adafruit and much more fonts. You can also create own font quite easily.

Thanks, for the reply.

Tonight I will:
• Check the I2C ...

Do you used a bootloader ?
Do you used PU on I2C line ?

(Thanks for the quick reply!!)

Answers :)
(1) Before this project, I did load the "STM32duino-bootloader". I didn't want to load a ST USB driver on my Mac, so I erased it (using the STMCubeProgrammer) and reprogrammed from the Arduino IDE ...

UPDATE from logic analyzer:

• Upon start up the OLED address (0x3C) is sent and the OLED responds with a negative acknowledgement / NAK
• After I press reset, the OLED address is sent, and the OLED responds with a positive acknowledgement / ACK

Next steps... get out the DSO and look at the raw ...

My setup:
• STM32F103C8T6
• ST Arduino core
• 0.96 SSD1306 I2C OLED
• Program: Adafruit "ssd1306_128x64_i2c" example program

The program compiles fine and uploads without issue using ST-Link and serial.
After upload, the program starts and the display works.

BUT if I disconnect the power (provided ...

(Note: There is no need to install Java to get the installer to run)

For those that want to set up the STM33duino using the STM32 Cores on a Mac running Mojave (10.14) here is what worked for me.

Follow the excellent instructions at: https://github.com/stm32duino/wiki/wiki/Getting-Started until ...