问题描述

有人知道如何在 Android 中使用 controlTransfer 设置奇偶校验吗?

Anybody knows how to set the parity with the controlTransfer in Android?

我在任何地方都找不到此方法参数的解释 - 只是参考中的一些通用信息.

I can't find the explanation of this method's parameters anywhere - just some generic info in the ref.

我发现的一个例子是:

conn.controlTransfer(0x40, 0x04, 0x0008, 0, null, 0, 0);    //data bit 8, parity none, stop bit 1, tx off

但我需要更改奇偶校验.有人有想法吗?

But I need to change the parity. Anybody has an idea?

非常感谢！

推荐答案

您可以定义位组合来创建自己的配置(奇偶校验、停止位和数据位).

You can define the combination of bits to create your own configuration (parity, stop bit & data bit).

conn.controlTransfer(0x40, 0x04, 0x0008, 0, null, 0, 0); 

第一个参数 - 0x40 - 请求设置或获取控制数据

1st parameter - 0x40  - request to set or get control data

 #define FTDI_SIO_SET_DATA_REQUEST_TYPE  0x40

第二个参数 - 0x04 - 要设置或获取的数据类型

2nd parameter - 0x04 - type of data to be set or get

#define FTDI_SIO_RESET      0 /* Reset the port */
#define FTDI_SIO_MODEM_CTRL     1 /* Set the modem control register */
#define FTDI_SIO_SET_FLOW_CTRL  2 /* Set flow control register */
#define FTDI_SIO_SET_BAUD_RATE  3 /* Set baud rate */
#define FTDI_SIO_SET_DATA   4 /* Set the data characteristics of the port */
#define FTDI_SIO_GET_MODEM_STATUS   5 /* Retrieve current value of modern status register */
#define FTDI_SIO_SET_EVENT_CHAR 6 /* Set the event character */
#define FTDI_SIO_SET_ERROR_CHAR 7 /* Set the error character */

第三个参数——0x0008——数据位8，奇偶校验无，停止位1，tx off——是要传递的实际数据.

Third parameter - 0x0008 - data bit 8, parity none, stop bit 1, tx off - Is the actual data to be passed.

第三个参数是一个 16 位的数据，可以由下面定义的常量组成:

The third parameter is a 16 bit data which can be formed from the constants defined below:

Bits 0 to 7   -- Number of data bits

Bits 8 to 10  -- Parity
          0 = None
          1 = Odd
          2 = Even
          3 = Mark
          4 = Space
Bits 11 to 13 -- Stop Bits
          0 = 1
          1 = 1.5
          2 = 2
Bit 14
          1 = TX ON (break)
          0 = TX OFF (normal state)
Bit15 -- Reserved


 #define FTDI_SIO_SET_DATA_REQUEST       FTDI_SIO_SET_DATA

 #define FTDI_SIO_SET_DATA_PARITY_NONE   (0x0 << 8)
 #define FTDI_SIO_SET_DATA_PARITY_ODD    (0x1 << 8)
 #define FTDI_SIO_SET_DATA_PARITY_EVEN   (0x2 << 8)
 #define FTDI_SIO_SET_DATA_PARITY_MARK   (0x3 << 8)
 #define FTDI_SIO_SET_DATA_PARITY_SPACE  (0x4 << 8)
 #define FTDI_SIO_SET_DATA_STOP_BITS_1   (0x0 << 11)
 #define FTDI_SIO_SET_DATA_STOP_BITS_15  (0x1 << 11)
 #define FTDI_SIO_SET_DATA_STOP_BITS_2   (0x2 << 11)
 #define FTDI_SIO_SET_BREAK              (0x1 << 14)

对于波特率:

* Value Baud Rate speed
* 0×2710 300
* 0×1388 600
* 0x09C4 1200
* 0x04E2 2400
* 0×0271 4800
* 0×4138 9600
* 0x80D0 14400
* 0x809C 19200
* 0xC04E 38400
* 0×0034 57600
* 0x001A 115200
* 0x000D 230400
* 0×4006 460800
* 0×8003 921600
*/

更多详情请参考以下链接:

Please refer the below links for more details:

http://read.pudn.com/downloads181/sourcecode/embed/842049/usb/serial/ftdi_sio.h__.htm

http://www.mev.co.uk/pages/Support/USB-Baud-Spoof.html

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