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

AWU

• on int disable AWU (or new int will be generated instantly)
• before re-enable re-load counter

UART

word length: UART_CR1.M stop bits: UART_CR3 baud rate: UART_BRR2 then UART_BRR1 en transmitter: UART_CR2.TEN send data: UART_DR and wait until TC goes 1