MCU: различия между версиями

Материал из fidoman.ru
Строка 31: Строка 31:
 
== UART ==
 
== UART ==
  
word length: UART_CR1.M
+
- word length: UART_CR1.M
stop bits: UART_CR3
+
- stop bits: UART_CR3
baud rate: UART_BRR2 then UART_BRR1
+
- baud rate: UART_BRR2 then UART_BRR1
en transmitter: UART_CR2.TEN
+
- en transmitter: UART_CR2.TEN
send data: UART_DR and wait until TC goes 1
+
- send data: UART_DR and wait until TC goes 1
 +
 
 +
TXE: set at end of transmission (and if TIEN then int is generated)

Версия 14:50, 4 ноября 2021

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

TXE: set at end of transmission (and if TIEN then int is generated)