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mircopython - uart

📖 English document

ardware introduction： BPI:bit(ESP32)

Serial port communication

There are three UART controllers on ESP32 chip.

Pin RX TX
UART0 3 1
UART1 23 19
UART2 5 18

Note: UART0 has been used by REPL.

Initialization and Use of Serial Port

Main functions

  1. uart=UART(1)

For example: uart = UART(1) , Initialize serial port 1 with a given baud rate.

  1. uart.init((baudrate, bits, parity, stop, tx, rx, rts, cts, timeout)):

Initialize the specified serial port

parameter function
id Serial slogans: 1, 2
baudrate baud rate
bits Number of digits per character
parity Parity check: 0-even, 1-odd
rx , tx UART read and write pins
stop Stop number: 1, 2
timeout Timeout < timeout < 0x7FFF FFFFFF (decimal: 0 < timeout < 2147483647)

For example: uart.init(9600, bits=8, parity=None, stop=1) Initialize the serial port with a given parameter.9600 is set baud rate，bits=8 is set data bits,parity=None is set whether parity is turned on,stop=1 is set the stop bit.

  1. uart.any():

Returns an integer, which is the number of characters that can be read without blocking. If there are no available characters, 0 is returned; if there are available characters, a positive number is returned. If there is more than one readable character, the method returns 1.

Usart Example

  1. uart.py -Use UART2 to send and receive messages