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candle-usb / candleLight_fw

gs_usb compatible firmware for candleLight, cantact and canable
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version for stm32F042C4xx? #171

Closed AlekseyMamontov closed 1 year ago

AlekseyMamontov commented 1 year ago

Good afternoon, Tell me, is there a firmware version for stm32F042C4xx? Has anyone managed to fit a project into 16 kbytes? ))

marckleinebudde commented 1 year ago

You can try v2.1 release https://github.com/candle-usb/candleLight_fw/releases/tag/v2.1, before we switched from -Os to -O2. It still fits into 16k:

Memory region         Used Size  Region Size  %age Used
           FLASH:       14720 B        32 KB     44.92%
             RAM:        3744 B         6 KB     60.94%
create and sign dfu bin file: cannette_fw
   text    data     bss     dec     hex filename
  14708     184    3572   18464    4820 cannette_fw
[100%] Built target cannette_fw

Use the cannette board a template.

fenugrec commented 1 year ago

Unless you have already purchased a large number of these, I strongly recommend going with the next larger flash size (32k). Otherwise it may or may not fit, depending on compiler version, optimization, etc.

AlekseyMamontov commented 1 year ago

You can try v2.1 release https://github.com/candle-usb/candleLight_fw/releases/tag/v2.1, before we switched from -Os to -O2. It still fits into 16k:

Memory region         Used Size  Region Size  %age Used
           FLASH:       14720 B        32 KB     44.92%
             RAM:        3744 B         6 KB     60.94%
create and sign dfu bin file: cannette_fw
   text    data     bss     dec     hex filename
  14708     184    3572   18464    4820 cannette_fw
[100%] Built target cannette_fw

Use the cannette board a template.

Thank you, it worked with the firmware for cantcat

Linux cannette_fw.bin It is detected as a USB device and configured as CAN - but does not work.

CandleLight_fw.bin Can't be seen as a USB device at all

Average size 14.5 kb

AlekseyMamontov commented 1 year ago

the current version takes up even less than 13.8kb with option -Os

marckleinebudde commented 1 year ago

You probably have to adopt the firmware for your board.

marckleinebudde commented 1 year ago

the current version takes up even less than 13.8kb with option -Os

We switched to -O2, as it's a means a considerable performance improvement. See commit message of 0612b5017f322d8675deb8a999312179ee437e48

AlekseyMamontov commented 1 year ago

I understand, I’ll buy an STM32F042C6 a little later. I just assembled a test version of the adapter board, and STM32F042C4 chips are in stock, it’s good that the crisis for chips is gradually going away). The CAN network in my equipment is not heavily loaded. I think there will be no missing packets. As I understand it, -O3 will also add performance. but not significantly.