Raspberry PICO2040 Flash Storage

The Following C Coded Library is used to perform Flash Write, Read and Erase functions on Raspberry Pico 2040.

Raspberry PICO 2040 Flash:

• The official board of rp2040 uses W25Q16JVUXIQ 16Mbit (2MB) flash chip.
• Runs on 133MHz on single SPI clock and 266/532MHz equivalent Dual/Quad SPI.
• Minimum 100K Program-Erase cycles per sector along with 20-years of data rentention.

Understading the Flow:

• This code is developed for rp2040 on Embedded C Language.
• rp2040 doesn't much resources over the internet to use flash in a simple way and the only option available was a library on Arduino IDE.
• The following library is completely made on C Language and very simple to use.
• A Simple example is available in the main.c with necessary comments on each line of code for better understanding.
• There are 3 functions to perform Read, Write and Erase of pico Flash :
  • pico_flash_read() ---> Performs Flash Read
  • pico_flash_write() ---> Performs Flash Write
  • pico_flash_erase() ---> Performs Flash Erase
• Please note, currently pico_flash_erase() will erase the whole page ( size = 256 ) and not just one memory location.

Conclusion:

• Currently, only 32-bit integers can be stored in the pico flash.
• You do have to declare all the varaiables to be stored in flash as shown in the main.c
• I hope you all like it :-D

Reference Material:

• https://datasheets.raspberrypi.com/rp2040/rp2040-datasheet.pdf
• http://wiki.amperka.ru/_media/products:raspberry-pi-pico:w25q16jvuxiq-datasheet.pdf