Lpc2000

Hi, I want to read an Eeprom 24LC515 provided by microchip with 2148.


To try, I want to use the Random Read operation after writing at a 
specific adress so I can know if memory work.

So I write at 0x0000 and all work fine.  

Now I want to Read at adress 0x0000.  

( I can't use Current read adress because the internal adress memory 
counter is now at 0x0001 ).

So I start by 

0x08 -> Send Control Byte. ( Write Mode )

0x18 -> Send Adress High Byte

0x28 ( First Time ) -> Send Adress Low Byte

0x28 ( First Time ) -> Here is the problem.

Hi set : 

I2C0CONSET = 0x10;  ( I set the Start byte )
I2C0DAT = 0xA1.  ( Control Byte.  Read Mode )

But If I do that I have 0x10 in I2CStat.

What I'm doing wrong.

Hi Jerome,

> I want to read an Eeprom 24LC515 provided by microchip with 2148.
> 
> To try, I want to use the Random Read operation after writing at a 
> specific adress so I can know if memory work.
> 
> So I write at 0x0000 and all work fine.  
> 
> Now I want to Read at adress 0x0000.  
> 
> ( I can't use Current read adress because the internal adress memory 
> counter is now at 0x0001 ).
> 
> So I start by 
> 
> 0x08 -> Send Control Byte. ( Write Mode )
> 
> 0x18 -> Send Adress High Byte
> 
> 0x28 ( First Time ) -> Send Adress Low Byte
> 
> 0x28 ( First Time ) -> Here is the problem.
> 
> Hi set : 
> 
> I2C0CONSET = 0x10;  ( I set the Start byte )
> I2C0DAT = 0xA1.  ( Control Byte.  Read Mode )
> 
> But If I do that I have 0x10 in I2CStat.
> 
> What I'm doing wrong.

nothing. :-)
0x10 means "repeated start condition" and happens, when you send a
start without sending a stop before. that's exactly what you want to
do during read. I only wonder, why you sent the control byte in read
mode that early. I would expect it in state of 0x10.

I hope I could help you. I managed the random read, but still got some
problems with the sequential. let me know if it worked out.

Jan

--- In lpc2000@yahoogroups.com, "cuemaker_e" <j.hansen@...> wrote:
>
> Hi Jerome,
> 
> > I want to read an Eeprom 24LC515 provided by microchip with 2148.
> > 
> > To try, I want to use the Random Read operation after writing at 
a 
> > specific adress so I can know if memory work.
> > 
> > So I write at 0x0000 and all work fine.  
> > 
> > Now I want to Read at adress 0x0000.  
> > 
> > ( I can't use Current read adress because the internal adress 
memory 
> > counter is now at 0x0001 ).
> > 
> > So I start by 
> > 
> > 0x08 -> Send Control Byte. ( Write Mode )
> > 
> > 0x18 -> Send Adress High Byte
> > 
> > 0x28 ( First Time ) -> Send Adress Low Byte
> > 
> > 0x28 ( First Time ) -> Here is the problem.
> > 
> > Hi set : 
> > 
> > I2C0CONSET = 0x10;  ( I set the Start byte )
> > I2C0DAT = 0xA1.  ( Control Byte.  Read Mode )
> > 
> > But If I do that I have 0x10 in I2CStat.
> > 
> > What I'm doing wrong.
> 
> nothing. :-)
> 0x10 means "repeated start condition" and happens, when you send a
> start without sending a stop before. that's exactly what you want 
to
> do during read. I only wonder, why you sent the control byte in 
read
> mode that early. I would expect it in state of 0x10.
> 
> I hope I could help you. I managed the random read, but still got 
some
> problems with the sequential. let me know if it worked out.
> 
> Jan
>

Thanks for Help the problem was that I not do A stop Condition 
Before.

Now It work, and also sequential read partially work.  ( Just in 
debug mode, not in full speed.)

Thks.