MCU

cam

ESP32-CAM OV2460

links

Lightweight C compilers http://fun4diy.com/

STM8

compilers comparation http://www.colecovision.eu/stm8/compilers.shtml

startup

1. Power requirements: 3.3-5V
2. Reset circuit (100nF cap)
3. Select clock source (ext.crystal/HSI)
4. Choose halt modes for
   1. flash
   2. HSI, HSE
5. use timer or AWU for wake-up if no ext.ints
6. calibrate LSI osc.
7. configure GPIO
8. use watchdog