It is possible but with RP2040 is not so straightforward, you have to use GPIOs and probably PIO.
On the other hand, RP2350 has dedicated hardware support for 2 QSPI devices: Flash and/or PSRAM.
It does the CS switch automatically, can work at full speed, and has transparent memory mappings with or without caching support, depending on the need. Or can still use PIO with GPIO for the secondary QSPI, it can provide speed improvements in some scenarios, but at a cost of complexity.
On the other hand, RP2350 has dedicated hardware support for 2 QSPI devices: Flash and/or PSRAM.
It does the CS switch automatically, can work at full speed, and has transparent memory mappings with or without caching support, depending on the need. Or can still use PIO with GPIO for the secondary QSPI, it can provide speed improvements in some scenarios, but at a cost of complexity.
Statistics: Posted by gmx — Sat Jul 05, 2025 2:29 pm