UART Serial Port & IrDA
- Albinleo Velappan (Deactivated)
- 1 Registry Keys
- 1.1 UseFlowCtrl
- 1.2 IrDA-Mode
- 2 See Also
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.
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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:,..) |
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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 ( 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.