 Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me. |
Forum Index : Microcontroller and PC projects : WeAct Pico2350B 48-pin Module
  Page 3 of 3 |
|||||
| Author | Message | ||||
| ville56 Guru  Joined: 08/06/2022 Location: AustriaPosts: 428 |
you may consult the Picomite user manual, there are descriptions of use-cases for PSRAM with pros and cons. 73 de OE1HGA, Gerald |
||||
Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 8642 |
It all depends, as do a lot of things. :) PSRAM gives you a very big RAM area but any programs you write that use it will, of course, only run on platforms that have it. If you want to run software written for the Pico or Pico 2 then you don't need PSRAM as neither of those platforms has it. As it's RAM it's main use is probably when you need lots of of temporary data storage. Your maximum program size isn't increased. This is why I'm not over concerned about problems I'm having with it on GAP1. That's designed for playing games and unless someone starts to write games that need PSRAM then it's merely a "nice to have". Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
||||
| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3660 |
I'm expecting only to run on RP2350. Heap has been my issue so far. PicoDB will run with LCD on a Pico2, Pico2-Zero, Pico2 clone, and WeAct RP2350B module, but on Peter's Pico2 HDMI board, I've had to cut way back on some array sizes, and also move from 800x600 to 640x480 in resolution. If speed doesn't become a issue (and I think it doesn't look like it will be), then if PSRAM can be used for heap, then largish (for microcontrollers) databases will be possible. PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on FOTS |
||||
| darthvader Regular Member  Joined: 31/01/2020 Location: FrancePosts: 100 |
I finally get the psram from aliexpress and they are working with this board , i dont have solder the 10k pullup resistor , as checking the schematics and see that they have already a 10k resistor soldered on the top of the pcb for the psram  Aliexpress Cheers. Theory is when we know everything but nothing work ... Practice is when everything work but no one know why ;) |
||||
| ville56 Guru Joined: 08/06/2022 Location: AustriaPosts: 428 |
Mine definitely didn't have pullups. Measured it before attaching one. Seems to be different production runs. 73 de OE1HGA, Gerald |
||||
| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 8642 |
If they'd used that odd bit of space at the end to extend the connectors by an extra row on each side, or even just one, we could have had D+ and D- brought out. It might have added 0.5mm to the board and increased the unit price by 0.0001p :( No free shipping or price reduction available on them now either, even for three. Edited 2026-02-22 22:46 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
||||
| darthvader Regular Member Joined: 31/01/2020 Location: FrancePosts: 100 |
After reding this, i become suspicious  I tested on another board with no psram soldered and get 9.97k ... So , it's definitely soldered on my batch Cheers. Theory is when we know everything but nothing work ... Practice is when everything work but no one know why ;) |
||||
| Pluto Guru Joined: 09/06/2017 Location: FinlandPosts: 411 |
I have 3 board w/o PSRAM. All have 10k pull-up to 3.3V. From different ordering batches. Older with A2 and newer with A4 chips. Pluto |
||||
| v.lenzer Regular Member Joined: 04/05/2024 Location: GermanyPosts: 100 |
My PSRAMs arrived today. Five for a few euros. I soldered one on immediately and 6 MB were recognized right away :) On my WeAct boards, there's a 10k-ohm resistor between pin 1 and 3.3V. Best wishes! Joachim |
||||
| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 8642 |
I've just got an A4 stepping version and it definitely has a 10K pullup in place for the PSRAM. I know 'cos I just measured it. :) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
||||
| Page 3 of 3 |
|||||
 Print this page |
 |
The Back Shed's forum code is written, and hosted, in Australia. | © JAQ Software 2026 |
