Difference: MicroSdBlocks (67 vs. 68)

Revision 682021-03-10 - PeterSchmid

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Hardware

Flash Drive

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The built-in flash (STM32WB55C has 1 MiB FLASH) can be used as a flash drive. No additional hardware is needed. 384 KiB is about the same as the old DD 5 1/4" floppy from 1978 had.

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Flash Memory Layout

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Built-in flash

The built-in flash (STM32WB55C has 1 MiB FLASH, page size 4 KiB) can be used as a flash drive. No additional hardware is needed. 384 KiB is about the same as the old DD 5 1/4" floppy from 1978 had. The STM32F403 has also 1 MiB flash, but most sectors are 128 KiB, and the built-in flash is therefore not suitable for a flash drive.

Flash Memory Layout

FLASH (rx)                 : ORIGIN = 0x08000000, LENGTH = 256K
   20 KiB Forth Core

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FLASH_BLESTACK (rx) : ORIGIN = 0x080C0000, LENGTH = 256K

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Serial Flash

The STM32F405 Feather has an 2 MiB Serial Flash W25Q16

SD Drive

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Home Brewed microSD Adapter for STM32WB55 Nucleo/Dongle

You can build a very cheap microSD adapter by yourself with a microSD to SD adapter. You have to solder only 7 wires to a pin header. The breakout board for microSD cards from Adafruit have a level shifter, but this is not needed because the levels on the Nucleo are already 3.3 V. Only the CD pin is missing, this could be handy to detect a microSD card.

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Block size 512 Bytes, SPI mode 0 (CPHA=0, CPOL=0), Pull-up on MISO.

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microSD Adapter on STM32F405 Feather

SDIO Interface

JTAG/SWD

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