RE: ARMP Processor and Display

michaelkellett — Thu, 20 Aug 2020 06:19:17 GMT

Hello Shabaz,

Digilent publish pin outs for 12 pin UART and SPI PMPODs and I'll comply with them.

The 3.3 V will be connected to the main 3.3V supply, so capable of as much as 1A (aggregate across all PMODs) at 3.3V.

RE: ARMP Processor and Display

fmilburn — Wed, 19 Aug 2020 22:38:09 GMT

RE Bluetooth - Probably not much help but the only one I have used is the TI CC2650 with a MSP432. Here is a link to the module I used: https://www.ti.com/tool/BOOSTXL-CC2650MA . It was easy to get started with the MSP432 and the TI development tools but I didn't stray far from their examples and have never looked at how it would integrate with other microcontrollers.

Frank

RE: ARMP Processor and Display

shabaz — Sat, 15 Aug 2020 20:22:33 GMT

Hi Michael,

Awesome, that's a good price for a display!

ESP32 guides are quite poor, I always waste half a day trying to recall how to use it, and have never got around to writing some notes.

The header is a much better idea, otherwise there's a BLE module I tried recently, and reviewed by others, Silabs BGX13P, which is straightforward to use.

It is BLE only, not Bluetooth 2.0, so the remote end needs code to make it look like a serial port (or for existing PC app connections using serial port replacement, use two devices back-to-back). The only downside is that (without using two of them back-to-back) it primarily only connects to mobile devices (iOS/Android) since that's all the manufacturer has supplied SDK code for. It can connect to a PC (Windows/Mac/Linux) in non-back-to-back configuration but it's non-trivial. Nevertheless, since the main use-case for wireless is likely to be to pull off data or configure from mobile, it could still be a good option, and it doesn't rule out PC, it's just harder. And existing PC apps are still supported out-of-the-box, albeit with another BGX13P for the back-to-back configuration.

It's also cheaper than ESP32, and easy to use. It doesn't support WiFi, but that doesn't seem a major negative.

The diagram below is from the datasheet, basically the boot pin can be pulled up via 100k resistor to VDD (no need for a jumper), and RESETn pin doesn't need a connection, or can be connected via open-drain to a reset signal. Any 47uF capacitor is fine for the supply rail, and it runs from 2.4-3.8V, and uses no more than about 30mA at peaks.

UART_TX is the output from the BGX13P, and the CTS/RTS are not needed.

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