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service:wince:driversxscale:uartirda

UART Serial Port & IrDA

This describes the serial-driver for the XScale-processor UARTs (universal asynchronous receiver/transmitter) of the Trizeps-module.

Registry Keys

The Serial-key is used for the FFUART, Serial2 for the BTUART and Serial3/Irda for the STUART of the XScale-processor. The STUART can be configured to interface with an infrared transceiver.

[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\Serial]
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\Serial2]
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\Serial3]
Key Type Description
UseFlowCtrl DWORD How and if the control-lines of the UART are used. See UseFlowCtrl
RxFifoHighWater DWORD This value is copied to FCR-register, and sets the FIFO-thresholds.
ModRWPrios DWORD Read-thread priority. Value between 0 and 255.
Priority256 DWORD Thread priorities of the driver. (0..255).
DeviceArrayIndex DWORD Specifies which UART interface. 0: FFUART, 2: BTUART, 3:STUART, 4:IrDA.
Index DWORD Specifies which index is to be used for this COM-driver (COM1:,COM2:,..)
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\IrDA]
DeviceArrayIndex DWORD Specifies which UART interface. 0: FFUART, 2: BTUART, 3:STUART, 4:IrDA.
Index DWORD Specifies which index is to be used for this COM-driver (COM1:,COM2:,..)
IrDAMode DWORD IrDA-Mode. See IrDA-Mode

UseFlowCtrl

How and if the control-lines of the UART are used. If a signal is not used by the serial-driver, it may be used as GPIO or other function by your application or driver.
The first serial port (COM1,FFUART) has all flow-control-lines.
The second port ( COM2, BTUART) only has CTS and RTS.
The third serial port (COM3 or IrDA, STUART) has no flow-control-lines.

Flags that can be set:

  • USE_DTR ( 0x0001)
  • USE_RTS ( 0x0002)
  • USE_CTS ( 0x0004)
  • USE_DCD ( 0x0008)
  • USE_DSR ( 0x0010)
  • USE_RI ( 0x0020)
  • RTS_INV ( 0x0040); invert RTS logic value.
  • DTR_INV ( 0x0080); invert DTR logic value.
  • USE_RTS_RS485 ( 0x0100); use RTS as signal to control an external RS485 transceiver.
  • USE_CTS_RS485_EN ( 0x400); Use CTS signal to enable RS485 transceiver.
  • BUGFIX_DONT_ABORT ( 0x1000); may be needed as workaround for C#.

IrDA-Mode

Sets IrDA-specific configuration:

  • Switch to GPIO on TX-Idle. (BugFix) ( 0x20)
  • RX-polarity: 0=positive-pulses are zeros, 1=negative-pulses are zeros.
  • TX-polarity: 0=positive-pulses are zeros, 1=negative-pulses are zeros.
  • XMode: 0=transmit-pulse-width is 3/16 of a bit-time wide, 1=transmit-pulse-width is 1.6us.

See Also

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service/wince/driversxscale/uartirda.txt · Zuletzt geändert: 2014/09/02 10:50 von