Hi Tim, Probably you saw that you will need to use some external clock.
You can try to use the ESP32 generated clock CLOCKOUT (ideally you can add a 0R option option to use CLOCKOUT180 instead) and connect it to GTXCK. Case it doesn't work you will need an external 50MHz oscillator. BR, Alan On 10/29/22, TimH <t...@jti.uk.com.invalid> wrote: > I meant esp32 not esr32. The naming is too similar lol > >> On 29 Oct 2022, at 15:51, Tim Hardisty <t...@jti.uk.com.invalid> wrote: >> >> Thanks Alan! SAMA5D2 has RMII so definitely a possibility. EFR32 is a >> much better value device compared to SiLabs Bluetooth 5 module currently >> used, and has WiFi as a bonus - so I will investigate it's IDE and see how >> easy it is to implement a GATT-based solution, or to load HCI firmware so >> I can be reasonably confident I'm not digging a big hole for myself if I >> make this change. >> >> >> On 29/10/2022, 13:23, "Alan C. Assis" <acas...@gmail.com> wrote: >> >> More info here: >> >> >> https://e2e.ti.com/support/processors-group/processors/f/processors-forum/366759/am335x-rmii-direct-connection-between-two-devices >> >> Same TI guy who said it was impossible latter talk internally and >> discovered that there was a customer already using it. >> >> BTW, you will need to have RMII supported by both MCUs (yes, ESP32 has >> RMII). >> >> BR, >> >> Alan >> >>> On 10/29/22, Alan C. Assis <acas...@gmail.com> wrote: >>> Hi Tim, >>> >>> I just searched if it was possible to connect two Ethernet MAC >>> directly without using PHY and it is possible, so it will not involve >>> cost for you: >>> >>> https://stackoverflow.com/questions/39503466/can-two-ethernet-mac-chips-be-connected-directly-without-going-thru-phy >>> >>> BR, >>> >>> Alan >>> >>>> On 10/29/22, Tim Hardisty <t...@jti.uk.com.invalid> wrote: >>>> Thanks for your clarifications Alan - I have messaged Espressif (your >>>> reply >>>> ended up in SPAM otherwise I might not have needed to) so I guess I'll >>>> get >>>> a >>>> similar answer. >>>> >>>> There is HCI (RCP) firmware for the SiLabs module so I can try that - >>>> it's >>>> the £7 per module saving of Espressif vs. SiLabs, plus getting WiFi for >>>> free >>>> that appeals. SAMA5D2 has Ethernet - unused on my board so it is not an >>>> idea >>>> that is completely out of the question: writing USRSOCK for the >>>> Espressif >>>> module is probably beyond me at this time! >>>> >>>> On 29/10/2022, 00:20, "Alan C. Assis" <acas...@gmail.com> wrote: >>>> >>>> Hi Tim, >>>> >>>> On 10/28/22, Tim Hardisty <t...@jti.uk.com.invalid> wrote: >>>>> Bit of a tangential question this, but I know there are folk on >>>> here >>>> who >>>>> are much more conversant with the way NuttX can be used with WiFi >>>> and >>>>> Bluetooth modules than I am. >>>>> >>>> >>>> I think these are important questions and other people could face >>>> similar issues in the future. >>>> >>>>> I may have an opportunity forced on me to have to respin my custom >>>> board >>>>> which currently has a SiLabs Bluetooth SoC as well as the main >>>> SAMA5D2 >>>>> processor. I used that module as I already have experience of it - >>>> but >>>> that >>>>> predates my NuttX journey. >>>>> >>>>> I see there are some very good value combined WiFi + Bluetooth >>>> modules >>>> now >>>>> (Espressif for example...and I know there's a well-known proponent >>>> of >>>> those >>>>> devices here lol) and, having seen a few other questions here, I am >>>> thinking >>>>> that I can go the HCI route and make use of the Bluetooth Stack in >>>> NuttX: >>>>> and add WiFi capability to my board at the same time. Winner! >>>>> >>>> >>>> First let me explain the differences: >>>> >>>> Espressif modules are not used as external modules on NuttX, >>>> everything is integrated inside the chip. >>>> >>>> During the WildernessLab's presentation on NuttX Workshop their team >>>> shown an ESP32 solution sharing WiFi as an external module. >>>> But they didn't use the default USRSOCK route, they implemented a >>>> new >>>> solution at home. >>>> >>>>> I'm hoping I can program up a suitable module with generic radio >>>>> co-processor software (HCI I think, and whatever is needed for >>>> WiFi) >>>> and >>>>> access it via UART from my main processor and have it all under the >>>> NuttX >>>>> system in a much more easily managed manner than a separate app on >>>> the >>>>> SiLabs SoC that just happens to communicate on some way with my >>>> main >>>> app on >>>>> the SAMA5D2. >>>>> >>>>> Have I got this right? Is an Espressif module a good choice (email >>>> me >>>> direct >>>>> if you want to !!)? >>>>> >>>> >>>> For Bluetooth (BLE) if there is a HCI firmware to SiLabs chip, then >>>> it >>>> could be possible to you use it, but you'll need to do some tests >>>> and >>>> debugging to get things working. >>>> >>>> For WiFi things are more complex because you need to implement a >>>> USRSOCK yourself to the chip. >>>> >>>> I never tested others possibilities: i.e. share Internet using SLIP >>>> between ESP32 and SAMA5D2, should be an easier route if it works, >>>> but >>>> of course you wil be limited to UART speed. >>>> >>>> Ethernet could be a better option (since ESP32 has Ethernet >>>> hardware), >>>> but it seems like an ugly and expensive workaround. >>>> >>>> BR, >>>> >>>> Alan >>>> >>>> >>>> >>> >> >> > >
