Difference: MicroSdBlocks (95 vs. 96)

Revision 962022-07-16 - PeterSchmid

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META TOPICPARENT	name="WebHome"

%DASHBOARD{ section="banner"

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Serial Flash

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STM32F405 Feather

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STM32F405 Feather (SPI W25Q16)

The STM32F405 Feather has a 2 MiB Serial Flash W25Q16

on board. The smallest erasable chunk of data is the 4 KiB sector. But the default FAT block is 512 Bytes, that means if you want to write something to a not erased block, you have to erase the whole sector. For this the sector has to be buffered in RAM. For details see:

https://github.com/spyren/Mecrisp-Cube/tree/F405/Forth/Src/fd.c

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The SST25VF016B seems to be compatible.

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STM32WB5MM Discovery Kit

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STM32WB5MM Discovery Kit (SPI S25FL128)

16 MiB Quad SPI NOR Flash chip S25FL128SDSMFV001

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The main flash array is divided into erase units called sectors. The sectors are organized either as a hybrid combination of 4-KB and 64-KB sectors, or as uniform 256-KB sectors.

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32 4 KiB sectors and 254 64 KiB sectors. With the 64 KiB sectors only the first 4 KiB are used. That means (32 + 254) * 4 KiB = 1140 KiB are available for the volume.

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32 4 KiB sectors and 254 64 KiB sectors. What a pain, why use STM this Flash? To simplify writing, only the first 4 KiB of the 64 KiB sectors are used. That means (32 + 254) * 4 KiB = 1140 KiB are available for the volume.

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STM32WB Feather

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STM32WB Feather (SPI W25Q128)

The W25Q128JVPIQ

. There are 4,096 erasable 4 KiB sectors. That means 16 MiB are available for the volume.

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STM32H743 Nucleo

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STM32H743 Nucleo (QSPI W25Q128)

There is no serial NOR flash on board, but there is an QSPI interface on connector CN10.

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SD Drive

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Home Brewed microSD Adapter for STM32WB55 Nucleo/Dongle

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Home Brewed microSD Adapter for STM32WB55 Nucleo/Dongle (SPI)

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.