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Forum Index : Microcontroller and PC projects : Pimoroni Pico Plus 2 W
| Author | Message | ||||
| PhenixRising Guru  Joined: 07/11/2023 Location: United KingdomPosts: 857 |
Here we go again Uses I2C? Does that mean no RX buffer? Edited 2024-09-27 19:05 by PhenixRising |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6778 |
TBH I wouldn't risk it. The official version probably won't be that far off now and it'll have proper support and documentation (probably!). I do wish the official Pico 2 had more flash though. I might be able to have some flash slots back then. :) I2C for what? . Edited 2024-09-27 19:14 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 857 |
The "Raspberry Pi RM2 radio module" is I2C and Tom's Hardware believes that the official version will use the same module; "early release" And why can't we buy the Raspberry Pi RM2 radio module for our existing Pico Plus-2s that we already received. Edit: Maybe the Raspberry Pi RM2 radio module has buffer memory(?) Edited 2024-09-27 19:44 by PhenixRising |
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| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 857 |
Good ol' ChatGPT |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6778 |
That makes sense. I2C was always intended for short messages and commands between devices on the same PCB. It's not designed for streaming as it's a multi-master system and another device may want the bus. It seems a bit odd to use it for wi-fi, but it's simple and cheap to implement. You just have to make your protocol solid enough and do your own buffering. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 857 |
Hi Mick, It's the Bluetooth that I'm more concerned with because it's my link to the Android HMI. None of the comm's are urgent but they don't wanna be missed. Think I'll go ESP32 if I need both WiFi and BT or at least stick with the HC-05. |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6778 |
I don't know how the RPi bit works, but I assume it's sensible. Keep to short strings. You can still work just as you would with anything else. If you are reading the bluetooth side directly make your program interrupt driven as a I2C slave produces an interrupt when there is a character to read. It's triggered on the first character. Was the bluetooth side ever enabled for the Pico W? I'm not sure. Edited 2024-09-28 00:04 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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lew247 Guru Joined: 23/12/2015 Location: United KingdomPosts: 1702 |
Just to confirm email from <support@pimoroni.com> Edited 2024-09-30 19:03 by lew247 |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6778 |
I'm not sure what the problem is with the Plus 2 and the PGA2350, but I suspect Pimorini have cheapened something or not followed the spec. Neither of them will overclock as well as the Pico 2. If you assume that RPi will *ever* revise the RP2350 you may have to wait an extremely long time, possibly forever. Unless there is a demand *from large industrial users* they won't consider it as it's not economically feasible IMHO. Just wait for the next new version. :) (Just got a ESP8266-01S working on a Gamma board. I have a router connection on a Pico 2. :) ) . Edited 2024-09-30 20:47 by Mixtel90 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 |
Mick, I am convinced the PSRAM equiped modules can not overclock as well because of physical limitations. I mean: because there are 2 memory devices on the QSPI bus. 2 devices, and the additional board traces, mean there is more capacitance on that bus. More capacitance = more delay = lower frequency. It is amazing that these PSRAM equipped devices can achieve 315MHz CPU clock. Regards Volhout PicomiteVGA PETSCII ROBOTS |
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| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 857 |
No, the BT of the Pico W was never enabled. The ESP32 makes sense because it's an independent MCU. I have created apps in B4A (Basic for Android) and B4R (Basic for Arduino) uses the same Basic syntax and also works for the ESP32. I'm sure I can tolerate the Arduino IDE for what I need. Thus far, I have downloaded the Arduino IDE, something like 5 times and within minutes, uninstalled it  Need to have a serious go  |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6778 |
I got rid of that shambles. I won't install it on this machine again as it's a disk and RAM hog. I can't afford the resources to run it. I'd rather load something like ESP Basic than use that. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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Sasquatch Guru Joined: 08/05/2020 Location: United StatesPosts: 362 |
I haven't completely given up on this! My testing showed that the Pimoroni Pico2 Plus device worked at higher clock rates with the PSRAM removed, but the PGA2350 device wouldn't work above 315MHz even with the PSRAM removed. This suggests to my mind that the PSRAM "loading" may only contribute to the problem. The other thing both devices have in common is that the FLASH and PSRAM are mounted on the opposite side of the PCB from the RP2350B. Each via looks to me like two 90 degree angles for the signal to navigate, generally not desirable for high speed signals. When the RP2350 chips become available, we will need to do some testing with careful layouts to see if it's possible to have both the FLASH and PSRAM working at the higher clock rates. Fortunately at JLCPCB prototyping prices it's a cheap education! -Carl |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 9105 |
For info: I've played with every conceivable parameter on the PGA2350 to try and up the speed. This includes: Changing the drive power on the 6 QSPI pins (2, 4, 8, 16mA) Enabling/disabling Fast slew Enabling/disabling Schmidt inputs Changing CS delays before and after chip access Changing the clock divider Upping the core voltage (to 1.5V) etc. They all make a difference in some way (normally making it worse) buy nothing allows me to clock much above 315MHz. Even the 324MHz needed for the new XGA video modes is not workable. Once the chip become available I will lay out a board with the RP2350B, 16Mb flash and 8Mb PSRAM with a variable linear regulator for the core voltage (default 1.1V) and we can see what happens. In the meantime the Pimoroni boards cannot be used above 315MHz so are probably best avoided. Its also worth noting that I can clock the standard Pico2 well above 400MHz but in all cases flash write access fails once the speed is above about 396MHz. This happens irrespective of the QSPI clock divider. Read access is fine but without write the PicoMite firmware can't run. |
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