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Andreas3
Visitor II
October 25, 2023
Question

Programming internal flash

I´m about to use the STM32L471xx circuit and want to program it from an external source.
What type of interface can I use to program the device?
I want to avoid using the JTAG interface.
Is it possible use USB or SPI interface?

This topic has been closed for replies.

3 replies

Sarra.S
ST Employee
October 25, 2023

Welcome @Andreas3 to ST Community,  

Two bootloader versions are available on STM32L47xxx/48xxx:
• V10.x supporting USART, I2C and DFU (USB FS device).
This version is embedded in STM32L47xxx/48xxx rev. 2 and rev. 3 devices.
• V9.x supporting USART, I2C, SPI, CAN and DFU (USB FS device).
This version is embedded in STM32L47xxx/48xxx rev. 4 devices.

Please check AN2606

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    TDK
    TDK
    October 25, 2023

    If you need to do any development or debugging at all, use the SWD connection and a programmer, or at least implement it on the board so you have the option.

    "If you feel a post has answered your question, please click ""Accept as Solution""."
      Tesla DeLorean
      Tesla DeLorean
      Guru
      October 25, 2023

      USART using AN3155 protocol is easy enough, several examples available.

      https://www.st.com/resource/en/application_note/an3155-usart-protocol-used-in-the-stm32-bootloader-stmicroelectronics.pdf

      https://github.com/ARMinARM/stm32flash/blob/master/protocol.txt

      https://github.com/arduino-libraries/MKRWAN/tree/master/examples/MKRWANFWUpdate_standalone

       

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