I just received HLP-7688A module and looking at the size I must admit that I tempted to create a Switch/Router in Hat format. I am not os sure about the SPI on this, but it has 2 UART’s, so assuming I can control the code on the Linux module this could be interesting with Wifi…
This is the same as is on my previous entry, but I focus on easyIPC and Plain. easyIPC is a lot of modules to communicate with the rest of the system and while we easily can add user modules in C++, we can also add them in Plain. Plain is compiled code running in a…
This illustrates the BasicPI Firmware Stack in progress. What I always do in embedded applications is to make a “standard” main.cpp as follows: void AppInit() { // wire hardware } int main() { AppInit(); // start OS } A team I worked in years ago agreed on this standard so we should…
CAN CAN RS485 RS485 Terminal switch for CAN & RS485 USB Micro SD Card SPI Flash RTC Battery Power connector I2C SPI TTL UART RS232 RS232 Raspberry PI Connector STM32F405RG SWD Connector Changes from Rev 1.0 1 Corrected wrong SPI Flash package 2 Added resistors to SPI 1 to support Half-Duplex SPI 3 Replaced…
This is a 3D of my Sensor IO Hat Rev 1.0 that allow interfacing to 8 x Analogue/Digital sensors, 3 x I2C and 3 x SPI. STM32F405 have 16 x 12 bit ADC channels and each AD port have 2 IO pins that can be used . The Sensor IO Hat is about connecting to…
The most obvious Hat to use HLK-7688A on is a Ethernet Switch or Router with SPI backbone support. I have ordered a dev unit so I can test out this possibility. The Ethernet switch part is very straight forward, I also see a very decent SPI, but I need to dig a bit more into…
First attempt on block diagram for the 3D Sensor Hat. The main components are FXOS8700 (Accelerometer and Magnetometer), FXAS21002 (Gyroscope), NEO 6/7/8 (GPS) and BME280 (Temperature, Humidity and Pressure). I am also attempting a TFT connection here, but this is secondary and can be ditched if needed. The rest is classic – Raspberry PI/SPI on…
Final 3D of the Sensor Hat. The most noticeable here is that I start using the 2×5 pin SWD header. The rest is as described before. MCU STM32F405RG 1 x High Speed SPI for backbone Raspberry PI Hat format 1 x CAN for control bus. 8 x 2 x Analogue/Digital IO Signals. 3 x I2C…
Just added the package for CR1220. The actual package look at bit different, but this has the correct footprint and size. This looks like a large component, but it is not – it is more an indication of how small and dense these Hat’s are. I will attempt to update the next revision of XPortHub…
I have still not routed this, but schematics and component location is getting in place. I have to make a package for CR1220 battery holder for RTC + I would like to make the proper packages for the connectors as well. I dropped the extra CAN and RS485 due to lack of space + I…