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ghent360 / PrntrBoardV2

32-bit 3D Printer controller board using STM32F407 and replaceable TMC2660/2209 stepper drivers.
https://blog.pcbxprt.com/index.php/category/prntrboard/
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sd-card i/o rework & fix #10

Closed ghent360 closed 3 years ago

ghent360 commented 3 years ago

At the moment the sd-card connector is broken (missing CS pin connection). We can:

  1. Move the sd-card to use hardware SPI1, freeing the SPI3 pins.
  2. Scrounge some new pin for the CS connection
  3. Switch the sd-card back to 1 bit SDIO and scrounge for pins.

Downside of #1 and #2 is that I need new bootloader to read sd-card via SPI. Not a terribly big issue. Downside for #2 and #3 is that we are short on pins again &^%@#$%^!

Best to probably byte the bullet on the bootloader and do #1, we'll have a few extra IO pins, which is nice.

ArkadiuszRaj commented 3 years ago

Vote for option 1, i.e move sd card tp spi1.

Also Iam interested in paricipating in IAP bootloader development. But to do so, I need first a board itself. However I want to await this as well as #9 issue is solved.

ghent360 commented 3 years ago

Code for the bootloader: https://github.com/ghent360/STM32F4_Bootloader

ghent360 commented 3 years ago

Re-wired the SD-card to SPI1 in the schematics and added extra pins to EXP2 and EXP3. Removed 3.3V from EXP3.

Need to route the changes in the PCB.

ghent360 commented 3 years ago

It has been routed. Thank you @ArkadiuszRaj