• State Not Answered
  • Locked Locked
  • Replies 0 replies
  • Subscribers 20 subscribers
  • Views 635 views
  • Users 0 members are here
Options
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

How to write and read on external ram (register of CF)

Sems Gencay

Hi,

I just try enough time but don't do it really to write and read on the register of an CompactFlash, I think that is the same for an external ram.

I have an embedded system, a pcb which have an AT89C51SND ( for mp3 ) communicating with a CompactFlash and I want to test this communication.
I want to read a sector (register) in the Compact Flash so I try first to write on the external ram and read this values but it doesn't work a work in true ide mode for the CompactFlash. Can you help me please?

So my code is:

//initial values//

CS0 = 0x00; //CS0
CS1 = 0x01; //CS1
PIO_RESET = 0x01;
AUXR = 0x0D;// ALE is activated for MOVEx

//program//

extern xdata Byte volatile CF_SECTOR_COUNT _at_ 0x1F2;
CF_SECTOR_COUNT = 16; //for example
printf("CF_SECTOR_COUNT=%x \n\r",CF_SECTOR_COUNT);
AUXR=0x0D;

//results//

CF_SECTOR_COUNT=301

//////////////////////////////////////////////

Is that the good way to test an external register of the compactflash ?

Thank you.

Sems

0