Welcome to the Linux Foundation Forum!
rs232 communication speeds over Embedded linux ARM
gigin
Posts: 2
Hi ,
I am using ARM embedded linux 2.6.30 on a samsung s3c2440. When I try to transfer bulk data (eg. a database) over serial port, I am getting speed of around 2-3 kbps. I am using a rs232 interface from my PC to the ARM development kit. The same code on PC to PC transfer gives me speed of 20kbps.
Is that the best speed I can get on an embedded platform. Can I do any to improve the performance, like mapping DMA channel for a UART or increasing the fifo size etc. etc.
Please help.
Thanks
0
Comments
-
What baud-rate and flow control are you using for the port? I have an ARM board w/ multiple rs-232 ports and can get 115kbps out of them.0
-
Hi,
I use a baudrate of 115200 and flow control is none.
Once I changed the fifosize of the serial port from inside the driver, I was able to increase the speed a little bit (to 4kbps), but not considerably.
woboyle, are you able to do the data transfer at a rate of 115kbps. If so, is your serial port using a DMA to transfer data. ? what is the value for fifosize ?
Thanks
gigin0 -
The most important thing is to utilize hardware flow-control at those speeds, otherwise no matter how big, the fifo buffer overflows. I don't pay attention to the DMA transfer issue - the boards I use run a version of Debian Etch and the serial drivers are built into the kernel. I haven't futzed with their configuration - only file system support and such.0
-
PC to PC transfer will be faster than PC to Embedded devices, due its Processor speed and a good enhanced OS will be in PC.
ARM kit is a Embedded device, so, the speed will be obviously less than PC-PC communication. In you case PC to PC also slow, a dead slow.
Check your settings in PC side too.
Try to transfer files from 512kb then increase step by step and find out where the things are going wrong.0 -
Six months later ... is the OP still around?0
Categories
- 9.9K All Categories
- 29 LFX Mentorship
- 82 LFX Mentorship: Linux Kernel
- 465 Linux Foundation Boot Camps
- 266 Cloud Engineer Boot Camp
- 95 Advanced Cloud Engineer Boot Camp
- 43 DevOps Engineer Boot Camp
- 28 Cloud Native Developer Boot Camp
- 1 Express Training Courses
- 1 Express Courses - Discussion Forum
- 1.6K Training Courses
- 17 LFC110 Class Forum
- 3 LFC131 Class Forum
- 19 LFD102 Class Forum
- 127 LFD103 Class Forum
- 9 LFD121 Class Forum
- 59 LFD201 Class Forum
- 1 LFD213 Class Forum - Discontinued
- 128 LFD232 Class Forum
- 23 LFD254 Class Forum
- 544 LFD259 Class Forum
- 100 LFD272 Class Forum
- 1 LFD272-JP クラス フォーラム
- 1 LFS145 Class Forum
- 20 LFS200 Class Forum
- 739 LFS201 Class Forum
- 1 LFS201-JP クラス フォーラム
- 1 LFS203 Class Forum
- 34 LFS207 Class Forum
- 294 LFS211 Class Forum
- 53 LFS216 Class Forum
- 45 LFS241 Class Forum
- 39 LFS242 Class Forum
- 33 LFS243 Class Forum
- 10 LFS244 Class Forum
- 27 LFS250 Class Forum
- 1 LFS250-JP クラス フォーラム
- 131 LFS253 Class Forum
- 958 LFS258 Class Forum
- 10 LFS258-JP クラス フォーラム
- 85 LFS260 Class Forum
- 124 LFS261 Class Forum
- 29 LFS262 Class Forum
- 78 LFS263 Class Forum
- 15 LFS264 Class Forum
- 10 LFS266 Class Forum
- 17 LFS267 Class Forum
- 16 LFS268 Class Forum
- 14 LFS269 Class Forum
- 193 LFS272 Class Forum
- 1 LFS272-JP クラス フォーラム
- 205 LFW211 Class Forum
- 148 LFW212 Class Forum
- 890 Hardware
- 212 Drivers
- 74 I/O Devices
- 44 Monitors
- 115 Multimedia
- 206 Networking
- 99 Printers & Scanners
- 85 Storage
- 747 Linux Distributions
- 88 Debian
- 64 Fedora
- 13 Linux Mint
- 13 Mageia
- 24 openSUSE
- 133 Red Hat Enterprise
- 33 Slackware
- 13 SUSE Enterprise
- 354 Ubuntu
- 468 Linux System Administration
- 38 Cloud Computing
- 67 Command Line/Scripting
- Github systems admin projects
- 93 Linux Security
- 77 Network Management
- 107 System Management
- 48 Web Management
- 61 Mobile Computing
- 22 Android
- 25 Development
- 1.2K New to Linux
- 1.1K Getting Started with Linux
- 525 Off Topic
- 127 Introductions
- 211 Small Talk
- 19 Study Material
- 782 Programming and Development
- 256 Kernel Development
- 492 Software Development
- 919 Software
- 255 Applications
- 181 Command Line
- 2 Compiling/Installing
- 76 Games
- 316 Installation
- 46 All In Program
- 46 All In Forum
Upcoming Training
-
August 20, 2018
Kubernetes Administration (LFS458)
-
August 20, 2018
Linux System Administration (LFS301)
-
August 27, 2018
Open Source Virtualization (LFS462)
-
August 27, 2018
Linux Kernel Debugging and Security (LFD440)