UART — 通用异步收发传输器¶
使用示例¶
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | # coding=utf-8
# This is a sample Python script.
import utime
from driver import UART
print("-------------------uart test--------------------")
print("-----How to test: haas100 connect PIN10 and PIN12-------")
print("-----How to test: haaseduk1 connect PIN19 and PIN21-------")
uart = UART();
uart.open("serial2")
utime.sleep_ms(1000)
writeBuf  = bytearray([0x41, 0x42, 0x43, 0x44]);
for i in range(10):
    uart.write(writeBuf)
    utime.sleep_ms(1000)
    readBuf = bytearray(4)
    recvSize = uart.read(readBuf)
    utime.sleep_ms(100)
    print(recvSize)
    print(readBuf)
uart.close()
 | 
配置信息¶
board.jon 语法和功能的详细配置项信息请参考 BoardConfig — 硬件端口配置文件(board.json)详解 。
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | {
    "version": "0.0.1",
    "io": {
      "serial2":{
        "type":"UART",
        "port":2,
        "dataWidth":8,
        "baudRate":115200,
        "stopBits":1,
        "flowControl":"disable",
        "parity":"none"
      }
    },
    "debugLevel": "DEBUG",
    "repl":"disable"
  }
 | 
函数接口¶
- 
UART.write(dataBuffer, expect_size)[源代码]¶
- 发送串口数据,该函数为阻塞函数,串口发送完成后才会返回 - 参数
- dataBuffer – 待写入的数据 
- expect_size – 待写入的数据字节数 
 
- 返回
- 负数表示异常,正数或0表示真实写出的数据 
- 引发
- OSError – EINVAL