Maixduino_K210toESP32_UART

ESP32_Arduino_recieve

#include <Arduino.h>
#include <Wire.h>
#include <SPI.h>
HardwareSerial serial_ext(2);

void setup() {
  Serial.begin(115200);
  serial_ext.begin(115200, SERIAL_8N1, 1, 3);
}

void loop() {
  if ( serial_ext.available() > 0 ) {
    String str = serial_ext.readStringUntil('\n');
    Serial.println(str);
  }

  vTaskDelay(10 / portTICK_RATE_MS);
}

ESP32_Arduino_send

#include <Arduino.h>
#include <Wire.h>
#include <SPI.h>
HardwareSerial serial_ext(2);

void setup() {
  Serial.begin(115200);
  serial_ext.begin(115200, SERIAL_8N1, 1, 3);
}

void loop() {

  int n = serial_ext.write("hello");

  vTaskDelay(10 / portTICK_RATE_MS);
}

K210_MaixPy_recieve

import network
from machine import SPI
from Maix import GPIO
from fpioa_manager import fm, board_info
import utime
from machine import UART

fm.register(6, fm.fpioa.UART2_TX, force=True)
fm.register(7, fm.fpioa.UART2_RX, force=True)
uart_Port = UART(UART.UART2, 115200,8,0,0, timeout=1000, read_buf_len= 4096)

i = 0
while i<20:
    a=uart_Port.readline()
    print("in",a)
    i=i+1

K210_MaixPy_send

import network
from machine import SPI
from Maix import GPIO
from fpioa_manager import fm, board_info
import utime
from machine import UART

fm.register(6, fm.fpioa.UART2_TX, force=True)
fm.register(7, fm.fpioa.UART2_RX, force=True)
uart_Port = UART(UART.UART2, 115200,8,0,0, timeout=1000, read_buf_len= 4096)

i = 0
while i<20:
    uart_Port.write("test\n")
    i=i+1