Solved

Write into an internal register on ADS target

Posted on 2004-10-10
1
177 Views
Last Modified: 2010-04-22
Hello,

Genaral:
I'm working with Montavista Linux 3.1 Embedded Development Kit( pro ) on Motorola M9328MXLADS Evaluation Board( has i.MX1 DragonBall Application Processor on it ).
I'm using NFS Cross Compile.

Problem Description:
When I'm trying to debug my code( via Telnet ) the following announcement appears:
"Segmantation problem".

My code:
#define DDIR_A       (*(volatile unsigned int *)(0x0021C000) // Absulote address
DDIR_A = 0x00000004;                                      // Output signal

Could someone help me? I have heard on "mmap" fuction, is it could be helpful?
Thanks.
0
Comment
Question by:nirbena
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
1 Comment
 
LVL 11

Accepted Solution

by:
dimitry earned 500 total points
ID: 12272654
From application you need to do something like this:
int fd;
volatile unsigned long *ddir_a;

fd = open("/dev/mem", O_RDWR | O_SYNC);
ddir_a = (volatile unsigned long *)mmap(0,0x1000, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0x0021C000);

*ddir_a = 0x00000004;

munmap((void *)ddir_a, 0x1000);
close(fd);
0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Have you ever been frustrated by having to click seven times in order to retrieve a small bit of information from the web, always the same seven clicks, scrolling down and down until you reach your target? When you know the benefits of the command l…
The purpose of this article is to fix the unknown display problem in Linux Mint operating system. After installing the OS if you see Display monitor is not recognized then we can install "MESA" utilities to fix this problem or we can install additio…
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …

739 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question