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49 lines
1.1 KiB
Markdown
49 lines
1.1 KiB
Markdown
## 串口扩展函数
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### 1.iostream\_serial\_create
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> 创建串口输入输出流对象。
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----------------------------
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#### 原型
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```js
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iostream_serial_create(device) => object
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iostream_serial_create(device, baudrate, bytesize, parity, stopbits, flowcontrol) => object
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```
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* device 为串口名称。
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* baudrate 为波特率，缺省为115200。
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* bytesize 为字节位数，缺省为8。
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* parity 为奇偶校验，缺省为none。
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* stopbits 为停止位，缺省为1。
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* flowcontrol 为流控，缺省为none。
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> 备注：其中 device 为必填参数，其他均为可选参数。
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#### 示例
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```js
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var a = iostream_serial_create("COM4");
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var b = iostream_serial_create("COM5", 115200, 8, "none", 1, "none");
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```
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### 完整示例
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```js
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//
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// start serial echo server first
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// ./bin/serial_recv 4000
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//
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var a = iostream_serial_create("/dev/ttys001", 0)
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var b = iostream_get_ostream(a)
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var c = iostream_get_istream(a)
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assert(ostream_write_uint32(b, 6) == 4)
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assert(ostream_write_string(b, "hello\n") == 6)
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assert(istream_read_uint32(c, 3000) == 6)
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assert(istream_read_string(c, 6, 3000) == "hello\n")
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```
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