[U-Boot-Users] Reg in SPI problem

[Karthikeyan Kadirvel, Chennai]

Hi,

 

I am developing dspi code(boot loader) for mcf54452 board. I am
communicating processor with EEPROM (AT25080A) slave device. Write
function is working fine. But the read function is not working. 

 

Write seq:

----------

 

1. Send WREN command 

2. Send write Instruction

3. Send address where to be data written

4. Send data

 

Note: i checked the write seq by seeing the signals in scope. Every byte
had been sent out (Sout) perfectly.

 

Read seq:

--------

1. Send read Instruction

2. Send address where from the data to be read. 

 

 

Note: i checked the read seq by seeing the signals in scope.

1. No SCK signals

2. No DATA (Sin)

3. Chip select in inactive state (high)

 

 

I checked with pdfs. i am not getting any solution for this problem.

 

So can you guide me to solve this problem?

 

Reply me as soon as possible

 

Regards,

Karthikeyan.

 

 

 

 

 

 



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