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Serial Port I/O

Since many embedded systems applications require serial I/O, RTTarget-32 supplies functions for this purpose. Module RTTCom has the following features:

• Asynchronous, interrupt-driven send and receive.
• Arbitrary send and receive buffer sizes.
• Up to four ports can be handled simultaneously.
• Supports XOn/XOff, RTS/CTS, and DTR/DSR handshake.
• Automatically detects 16550 UARTs and supports their internal FIFO buffer.
• Full control over all modem control lines.

RTTCom can work with 8250, 16450, 16550 and compatible UART chips. RTTCom's functions are described in the following sections. Prototypes for all of them are given in header file Rttcom.h.

If you use RTKernel-32 with RTTarget-32, RTTarget-32's RTTCom should not be used. RTKernel-32's module RTCom is optimized for serial communication in a real-time multitasking environment.

Demo program SerDemo demonstrates how to use RTTCom.

Function RTInitCOMPort

Function RTCloseCOMPort

Function RTSendChar

Function RTSendCharTimed

Function RTSendBlock

Function RTSendBlockTimed

Function RTSendBufferCount

Function RTReceiveBufferCount

Function RTReceiveChar

Function RTReceiveCharTimed

Function RTCOMError

Function RTLineStatus

Function RTModemStatus

Function RTModemControl

PCI BIOS