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Technical Support
On-Line Manuals
RL-ARM User's Guide (MDK v4)
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 RL-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
SNTP Client
Error Function
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
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
Redirecting Output
Debug messages are output to a standard serial port. The sendchar() function outputs a single character. If required, you can customize this function to send the debug messages to some other device. In most cases, a serial UART is used to print out the debug messages.
Note
- When the sendchar function runs in polling mode, printing all debug messages significantly reduces the performance. The preferred way is to rewrite the sendchar() function to work in the interrupt mode.
- Use the highest baud rate possible to reduce the impact on performance from printing the debug messages.
- If the debug mode is enabled and the embedded system is connected to a high traffic LAN with plenty of broadcast packets, the system might malfunction.
- Printing debug messages blocks out the system task scheduler during the time when the message is being sent from the serial port. The incoming IP packets accumulate in the memory. This soon causes an out of memory error. Any further incoming packets are lost until some memory is released.
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