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Continuing with the NAND Flash connected to the Raspberry Pico.

There is a good example code from Adafruit for thr RP2040 to transform it into a USB mass storage device, using the Adafruit Tiny USB stack. The example code is running from SRAM (8kByte to be exact). The code can be found here: https://github.com/adafruit/Adafruit_TinyUSB_Arduino/blob/08c7dabed48b5ab92839289f58191b3f04f48fb0/examples/MassStorage/msc_ramdisk/msc_ramdisk.ino
The idea is to simply rewrite the code to use my NAND Flash.

GitHubAdafruit_TinyUSB_Arduino/examples/MassStorage/msc_ramdisk/msc_ramdisk.ino at 08c7dabed48b5ab92839289f58191b3f04f48fb0 · adafruit/Adafruit_TinyUSB_ArduinoArduino library for TinyUSB. Contribute to adafruit/Adafruit_TinyUSB_Arduino development by creating an account on GitHub.

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Oct 25, 2026 · 11:17 UTC

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Fused Engineering@[email protected]

19h

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So I was wondering why it is not working. The implementation should be easy and straight forward. Just put in the read and write functions...

🤦🤦🤦

Do you spot it? I put the write function in the read callback and the read function in the write callback.

Captain Jean Lyc Picard performing the facepalm on his captains chair.

$// Callback invoked when received READ10 command. // Copy disk's data to buffer (up to bufsize) and // return number of copied bytes (must be multiple of block size) int32_t msc_read_callback(uint32_t lba, void* buffer, uint32_t bufsize) { flash.flash_programm(lba, (uint8_t*)buffer, bufsize); return bufsize; } // Callback invoked when received WRITE10 command. // Process data in buffer to disk's storage and // return number of written bytes (must be multiple of block size) int32_t msc_write$

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