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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] |
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[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\Serial2] |
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[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\Serial3] |
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| 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] |
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| 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 ( 0×0001)
- USE_RTS ( 0×0002)
- USE_CTS ( 0×0004)
- USE_DCD ( 0×0008)
- USE_DSR ( 0×0010)
- USE_RI ( 0×0020)
- RTS_INV ( 0×0040); invert RTS logic value.
- DTR_INV ( 0×0080); invert DTR logic value.
- USE_RTS_RS485 ( 0×0100); use RTS as signal to control an external RS485 transceiver.
IrDA-Mode
Sets IrDA-specific configuration:
- Switch to GPIO on TX-Idle. (BugFix) ( 0×20)
- 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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