… Ryöpäs
I did some rough measurements using my picoscope on EMW3165 (ie. STM32F411CE) module to find out how deep sleeping during tickless idle affects system scheduling latency. I connected logic analyzer to four GPIO signals to get timings for SysTick, RTC wakeup, HSE oscillator startup time and application task activity. GPIO pins are driven by a …
I pushed last bits of pico]OS 1.1 branch to github today and created 1.1.0 prerelease version. It is a major improvent on energy efficiency, since timer ticks can now be suppressed when system is idle.
This project started when our cat decided that playing with our thermometer is a good idea. Obviously, the thing looks enough like mouse with tail, at least when looked with cat’s eyes. The play with it ended very quickly and result was broken cable between display and sensor.The easiest way to fix this would obviously …
I needed a simple MQTT client for my embedded projects. I know that there are already many implementations available, but I wanted to learn also the protocol internals so I ended up in writing it from scratch (MQTT protocol is pretty well documented and the specification is available from mqtt.org).
After experimenting with EMW3162 module, I discovered about EMW3165. It is pretty much similar to EMW3162, but has Cortex-M4 cpu and extra 2Mb spi flash chip. It is also $2 cheaper than EMW3162. I bought some EMW3165 modules, but those seem a little bit challenging to solder on development board or breakout boards (someone mentioned those …