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Forum Index : Microcontroller and PC projects : QSPI...
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9306 |
As I note that the Pico module use QSPI for the external memory device, I decided to read a little more about it - it is a clever interface. QSPI description This page is easy to understand despite QSPI being quite complicated in and of itself. I found this a very interesting read. Smoke makes things work. When the smoke gets out, it stops! |
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lew247 Guru  Joined: 23/12/2015 Location: United KingdomPosts: 1702 |
PICO2 related comment* From reading that description it "seems to me" (which I'm often wrong) that it is useful for video applications? Pimeroni have a plus2 board with 16MB of QSPI flash supporting XiP Link A top of the line Pirate-brand RP2350 microcontroller with 16MB of flash memory, 8MB of PSRAM, USB-C, Qw/ST and debug connectors. Pimoroni Pico Plus 2 is powered and programmable via USB-C and comes with an upgraded 8MB RAM, 16MB of flash storage and easy to read pin labels. It's super easy to connect up to things without soldering, with a Qwiic/STEMMA QT connector (for adding I2C sensors and breakouts), a SP/CE connector (for hooking up SPI/serial devices) and a debug connector (for if you like to program using a SWD debugger). We've also added a reset button, and a BOOT button - this can also be used as a user switch. Features Powered by RP2350B (Dual Arm Cortex M33 running at up to 150MHz with 520KB of SRAM) 16MB of QSPI flash supporting XiP 8MB of PSRAM USB-C connector for power, programming, and data transfer Qw/ST (Qwiic/STEMMA QT) connector for attaching breakouts Intriguing SP/CE connector 3 pin debug connector (JST-SH) Reset and BOOT buttons (the BOOT button can also be used as a user button) User LED indicator On-board 3V3 regulator (max regulator current output 600mA) Input voltage range 3V - 5.5V Compatible with Raspberry Pi Pico add-ons Measurements: approx 53mm x 21mm x 9mm (L x W x H, including connectors) Matherp am I correct in my thinking? *if i am* will you be supporting the "plus" version with QSPI? even if it's only after the actual chips are available to the public and not just select companies Edited 2024-08-28 17:58 by lew247 |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6779 |
You are restricted by the number of available CS lines, like you are on SPI except that you can't use just any old pin. If you have one CS line then you can add one QSPI device. PSRAM or flash, but not both for example. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 4222 |
Lew247, That (pico2-plus) is the board that I ordered. It basically is the same as the PGA2350 that Peter has, but in a pico form factor (including USB-C but a lower number of GPIO pins). Volhout PicomiteVGA PETSCII ROBOTS |
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