Hi,
It's my first post here, I have an embedded system, a pcb which have an AT89C51SND which communicates with a CompactFlash by a latch 74573 (for P0 signals address and data) 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 ( I read FFh only).
Howewher ALE is set it does'nt seems to work.
For true ide mode for the CompactFlash, I must set the bit EXT16 and my AUXR register has this config : 0xCDh.
My code is in Keil compilator:
Code:
/* results is : */
..
-[FF00]
-[FF00]
...
When I try to read or write it's not work.
Is there a programming problem or addressing external registers?
Can you help me please ?
Is that the good way to test an external register of the compactflash ?
Thank you.
It's my first post here, I have an embedded system, a pcb which have an AT89C51SND which communicates with a CompactFlash by a latch 74573 (for P0 signals address and data) 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 ( I read FFh only).
Howewher ALE is set it does'nt seems to work.
For true ide mode for the CompactFlash, I must set the bit EXT16 and my AUXR register has this config : 0xCDh.
My code is in Keil compilator:
Code:
Code:
/* READ registers AT-interface */
#define atBASE 0xc000
unsigned char volatile xdata atrDATMSB _at_ 0xF000; /* MSB register op interface-kaart */
unsigned char volatile xdata atrALTERN _at_ 0xF006;
unsigned char volatile xdata atrDRIVAD _at_ 0xF007;
unsigned char volatile xdata atrDATLSB _at_ 0xF008;
unsigned char volatile xdata atrERROR _at_ 0xF009;
unsigned char volatile xdata atrSECCNT _at_ 0xF00A;
unsigned char volatile xdata atrSECNR _at_ 0xF00B;
unsigned char volatile xdata atrCYLLOW _at_ 0xF00C;
unsigned char volatile xdata atrCYLHIG _at_ 0xF00D;
unsigned char volatile xdata atrDRHEAD _at_ 0xF00E;
/* AT89 config & registers */
CS0 = 0x01; //CSO
CS1 = 0x00; //CS1
AUXR = 0x4D; // the bit 7 is set by default so AUXR = 0xCD
printf("test loop...\n\r");
for(j=0;j<256;j++)
{
atrSECNR = j;
for (z=0;z<1000;z++);
delayrout(50000);
printf("-[%X]\n",atrSECNR);
}/* results is : */
..
-[FF00]
-[FF00]
...
When I try to read or write it's not work.
Is there a programming problem or addressing external registers?
Can you help me please ?
Is that the good way to test an external register of the compactflash ?
Thank you.