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RE: How to Work with MSPM0 Microcontrollers... and Build a Peripheral Expander / Processor Companion!

shabaz — Sun, 05 Jul 2026 15:29:22 GMT

I've been slowly (it's hot, hard to work!) improving this, there's now a small feature enhancement; for the ADC function, there is now an output pin called SAMP_TRIG_OUT which goes high whenever any of the three ADC inputs are being sampled.

It's useful for NTC thermistor measurements (either used directly as shown here, or via a buffer/MOSFET):

This saves energy, and also reduces thermistor self-heating. Temperature measurements are more accurate as a result. (Github repo updated).

RE: GPS Tracker using Heltec WiFi LoRa 32 V4 and REYAX RYS352A GNSS Module

Dipeshkachhi — Fri, 03 Jul 2026 09:54:28 GMT

Nice build! Combining the Heltec WiFi LoRa 32 V4 with the Reyax RYS352A multi-GNSS module makes for a solid GPS tracker. The RYS352A supports GPS, GLONASS, Galileo, BeiDou, and QZSS—giving faster fixes and better coverage than GPS-only modules.

RE: Seeed Studio Launches New XIAO nRF54LM20A Dev Board

Dipeshkachhi — Fri, 03 Jul 2026 09:52:25 GMT

The XIAO nRF54LM20A is a huge step up—2× performance and 3× efficiency over the nRF52840, with ultra-low power and up to 28 GPIOs in that tiny footprint. The nPM1300 PMIC and 8 MB flash make it ideal for wearables and battery-powered edge AI projects. Software support is still early (Arduino not ready yet), but for Zephyr/nRF Connect users, this board is a serious powerhouse. Great work, Seeed!

RE: GPS Tracker using Heltec WiFi LoRa 32 V4 and REYAX RYS352A GNSS Module

DAB — Thu, 02 Jul 2026 21:42:53 GMT

Nice build.

RE: Seeed Studio Launches New XIAO nRF54LM20A Dev Board

embeddedguy — Tue, 30 Jun 2026 19:52:59 GMT

Hi [mention:c6e5c195ad2a43f8aeea3ca42d0c3d9f:e9ed411860ed4f2ba0265705b8793d05] , that is great news. But I am a little disappointed that it is LM20A not LM20B. Because the B version has ML optimizations for tiny-ml models.

These SoCs are normally not available to buy but on special requirements they provide to some customers, such as Seeed.

RE: Using WebUSB to facilitate Functional Circuit Test (FCT) Data Capture

kmikemoo — Thu, 25 Jun 2026 23:42:08 GMT

Great post! Awesome application!

RE: Using WebUSB to facilitate Functional Circuit Test (FCT) Data Capture

DAB — Thu, 25 Jun 2026 20:03:59 GMT

Very good post.

RE: Using WebUSB to facilitate Functional Circuit Test (FCT) Data Capture

shabaz — Wed, 24 Jun 2026 16:26:39 GMT

Nice work! Also, bonus, WebUSB is supported on Android Chrome, hence it's a simple way to attach Pi Pico to a mobile, and the HTML/JavaScript will run just fine.

RE: MSPM0 analogue front-end: general purpose amp as buffer for ADC

DAB — Tue, 23 Jun 2026 19:39:32 GMT

Nice post Jan.

I did not know that this device included opamps withing the architecture.

It looks like TI is copying capability from the PSOC.

RE: How to Work with MSPM0 Microcontrollers... and Build a Peripheral Expander / Processor Companion!

kk99 — Sun, 14 Jun 2026 13:45:56 GMT

Nice video/write-up.

RE: How to Work with MSPM0 Microcontrollers... and Build a Peripheral Expander / Processor Companion!

Jan Cumps — Sun, 14 Jun 2026 07:29:18 GMT

TI published an application note that allows flex on the interface side: IO Expander With SPI, I2C, and UART.

The example in your post focuses on one interface, and several expansion options (GPIO, ADC, PWM, UART).

The application note sticks to one expansion type: GPIO. But it shows how to use different communication techniques to do that: I2C, SPI and UART.

RE: How to Work with MSPM0 Microcontrollers... and Build a Peripheral Expander / Processor Companion!

DAB — Sat, 13 Jun 2026 20:35:08 GMT

Very good video.

RE: How to Work with MSPM0 Microcontrollers... and Build a Peripheral Expander / Processor Companion!

genebren — Sat, 13 Jun 2026 16:01:41 GMT

This is a very useful approach and another great write-up! I have utilized very similar techniques to replace analog/digital circuitry with tiny microprocessors, or like you used here, master/slave processors to overcome pin/peripheral shortages or to isolate time critical functions into a slave processor.

I have been thinking about updating some of my products to replace some of my TTL parts with tiny microprocessors to help reduce my part count in inventories. Not sure how big of an effect this will have, but it might help as some of these parts hit end of life.

RE: How to Work with MSPM0 Microcontrollers... and Build a Peripheral Expander / Processor Companion!

shabaz — Sat, 13 Jun 2026 14:06:04 GMT

Just thought of another feature I really want to add: AC measurement on an ADC channel. Would save on external circuitry, or for the main processor from having to rapidly sample, i.e. just let the peripheral perform that measurement and retrieve the result via I2C. There is a TI example (PDF) of full AC power measurement, so I can probably examine that for ideas.

RE: How to Work with MSPM0 Microcontrollers... and Build a Peripheral Expander / Processor Companion!

embeddedguy — Fri, 12 Jun 2026 04:46:19 GMT

Oh, so you ran out of UART interface. That is weird, but there is software serial as well. Also, not sure but some low-end FPGA chip can also emulate some peripherals such as I2C, etc.