How to use Three Hardware Serial ports on Arduino ESP32
English below
ESP32 có 3 kênh phần cứng Serial.
Serial 0: nạp code và debug hệ thống (có thể tắt debug bằng cách kéo GPIO2 xuống GND).
Serial 1: chức năng SPI Flash
Serial 2: không dính chức năng đặc biệt
Để tránh chức năng đặc biệt và sử dụng full 3 Hardware Serial mà không cần phải dùng đến thư biện Software Serial, bạn có thể mapping các chân TX,RX của Serial cần sử dụng vào chân khác. Cú pháp trên Arduino:
Serialx.begin(Baud Rate, Data Frame, RX pin, TX pin)
Tốc độ baud có thể thiết lập: 300, 600, 1200, 2400, 4800, 9600, 14400, 19200, 28800, 38400, 57600, or 115200, 256000, 512000, 962100
Khung truyền có thể thiết lập:
SERIAL_5N1 5-bit No parity 1 stop bit
SERIAL_6N1 6-bit No parity 1 stop bit
SERIAL_7N1 7-bit No parity 1 stop bit
SERIAL_8N1 (the default) 8-bit No parity 1 stop bit
SERIAL_5N2 5-bit No parity 2 stop bits
SERIAL_6N2 6-bit No parity 2 stop bits
SERIAL_7N2 7-bit No parity 2 stop bits
SERIAL_8N2 8-bit No parity 2 stop bits
SERIAL_5E1 5-bit Even parity 1 stop bit
SERIAL_6E1 6-bit Even parity 1 stop bit
SERIAL_7E1 7-bit Even parity 1 stop bit
SERIAL_8E1 8-bit Even parity 1 stop bit
SERIAL_5E2 5-bit Even parity 2 stop bit
SERIAL_6E2 6-bit Even parity 2 stop bit
SERIAL_7E2 7-bit Even parity 2 stop bit
SERIAL_8E2 8-bit Even parity 2 stop bit
SERIAL_5O1 5-bit Odd parity 1 stop bit
SERIAL_6O1 6-bit Odd parity 1 stop bit
SERIAL_7O1 7-bit Odd parity 1 stop bit
SERIAL_8O1 8-bit Odd parity 1 stop bit
SERIAL_5O2 5-bit Odd parity 2 stop bit
SERIAL_6O2 6-bit Odd parity 2 stop bit
SERIAL_7O2 7-bit Odd parity 2 stop bit
SERIAL_8O2 8-bit Odd parity 2 stop bit
Tài liệu tham khảo:
https://github.com/espressif/arduino-esp32
https://randomnerdtutorials.com/esp32-pinout-reference-gpios/
ESP32 have Three Hardware Serial
Serial 0: is used to communicate with the ESP32 for programming and during reset/boot.
Serial 1: use this port for SPI Flash access though
Serial 2: is unused.
To use full 3 Serial, the TX and RX pin of Serialx can maps to unused pins. The format for setting a serial port is as follows:
Serialx.begin(Baud Rate, Data Frame, RX pin, TX pin)
EX: RX1 (GPIO9),TX1(GPIO10) maps to GPIO18 and GPIO19 at Baud Rate 115200 and Data Frame: 8-bit No parity 1 stop bit
Serial1.begin(115200, SERIAL_8N1, 18, 19)
Baud Rates available: 300, 600, 1200, 2400, 4800, 9600, 14400, 19200, 28800, 38400, 57600, or 115200, 256000, 512000, 962100
Data Frame available:
SERIAL_5N1 5-bit No parity 1 stop bit
SERIAL_6N1 6-bit No parity 1 stop bit
SERIAL_7N1 7-bit No parity 1 stop bit
SERIAL_8N1 (the default) 8-bit No parity 1 stop bit
SERIAL_5N2 5-bit No parity 2 stop bits
SERIAL_6N2 6-bit No parity 2 stop bits
SERIAL_7N2 7-bit No parity 2 stop bits
SERIAL_8N2 8-bit No parity 2 stop bits
SERIAL_5E1 5-bit Even parity 1 stop bit
SERIAL_6E1 6-bit Even parity 1 stop bit
SERIAL_7E1 7-bit Even parity 1 stop bit
SERIAL_8E1 8-bit Even parity 1 stop bit
SERIAL_5E2 5-bit Even parity 2 stop bit
SERIAL_6E2 6-bit Even parity 2 stop bit
SERIAL_7E2 7-bit Even parity 2 stop bit
SERIAL_8E2 8-bit Even parity 2 stop bit
SERIAL_5O1 5-bit Odd parity 1 stop bit
SERIAL_6O1 6-bit Odd parity 1 stop bit
SERIAL_7O1 7-bit Odd parity 1 stop bit
SERIAL_8O1 8-bit Odd parity 1 stop bit
SERIAL_5O2 5-bit Odd parity 2 stop bit
SERIAL_6O2 6-bit Odd parity 2 stop bit
SERIAL_7O2 7-bit Odd parity 2 stop bit
SERIAL_8O2 8-bit Odd parity 2 stop bit
Have fun !!!
Docs:
https://github.com/espressif/arduino-esp32
https://randomnerdtutorials.com/esp32-pinout-reference-gpios/
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