RL-ARM User's Guide
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RL-ARM User's Guide

RL-RTX RL-FlashFS RL-TCPnet TCP Socket Opening TCP Connection TCP Active Open TCP Passive Open Sending TCP Data Example for Sending Data Multiple TCP Connections UDP Socket Opening UDP Connection Sending UDP Data When DHCP Enabled When ARP Cache Empty Example for Sending Data IP Multicasting Multiple UDP Connections Configuring TCPnet Static Configuration System Definitions Ethernet Network Interface PPP Network Interface SLIP Network Interface UDP Socket TCP Socket BSD Socket HTTP Server Telnet Server TFTP Server TFTP Client FTP Server FTP Client DNS Client SMTP Client SNMP Agent Runtime Configuration Library Files Using RL-TCPnet Stand Alone With RTX Kernel Event Driven Operation IP Address Assignment Ethernet Interface PPP Interface SLIP Interface Localhost Applications HTTP Server Script Language CGI Functions Ajax Support Using XML XML Example How it works SOAP Support SOAP Interface Large POST Messages Web Pages Default Page Error Pages Web on SD Card Web Update File System Interface Http Caching How it works Internal Web External Web Multi-user Authentication Using RAM File System FCARM File Converter PRINT Directive NOPRINT Directive PAGEWIDTH Directive PAGELENGTH Directive ROOT Directive Telnet Server Command Line Interface Multi-user Authentication Sending Reply Message Short Reply Long Reply Continuous Screen Update TFTP Server File System Interface TFTP Client File System Interface FTP Server File System Interface Multi-user Authentication Supported Commands FTP Client File System Interface SMTP Client SNMP Agent MIB Database MIB Interface MIB Entry MIB Table DNS Resolver Starting DNS Device Drivers Ethernet Driver Interrupt Mode Modem Driver Serial Driver Using Serial Link Cable Connection Modem Connection Windows Dial-up Add Direct Serial Link New Dial-up Connection Configure PPP Dial-up Configure SLIP Dial-up Debugging Enabling Debug Debug Level Redirecting Output Function Overview BSD Routines CGI Routines Ethernet Routines Error Function FTP Routines HTTP Routines IGMP Routines Miscellaneous Routines Modem Routines PPP Routines Serial Routines SLIP Routines SMTP Routines SNMP Routines System Functions TCP Routines Telnet Routines TFTP Routines UDP Routines RL-CAN RL-USB Example Programs Library Reference Appendix

Serial Driver

The Serial Driver handles a serial port and is required for a PPP or SLIP serial network interface. The Serial Driver is interrupt driven since polling for a new character sometimes fails at higher baud rates and some of the received characters might be lost.

The serial receive interrupt function stores incoming characters to an intermediate input buffer. The serial transmit interrupt function sends outgoing data from an output buffer to a serial port.

If you use a serial PPP or SLIP network interface, then copy the serial device driver to your project directory and add it to your project.

The required functions of the driver are:

RL-TCPnet includes various serial device drivers for different ARM device variants. The driver filename syntax used is Serial_xxxx.c, where xxxx is the device name. The drivers are located in the \Keil\ARM\RL\TCPnet\User directory:

  • Serial.c is configured for Philips LPC21xx devices. Use this driver for all Keil MCB21xx evaluation boards.
  • Serial_LPC214x.c is configured for Philips LPC214x devices. This driver uses extended features which allow configuring various baud rates using built-in fractional baud rate generator.
  • Serial_S3C44B0X.c is configured for Samsung S3C44B0X devices.

For ARM device variants that are not currently supported, or if you are using an external UART, use the Serial.c device driver as a template and customize it for your needs.

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