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There are absolute memory macros to access memory addresses in 8051, do we have any such to access externally connected flash through 8051?
I tried using C pointers, it does not seem to be reading the address in flash, How do we read & write from a memory location? Please help.
Right O boss,
"they are sent from the 8051 to the external chip via the SPI."
Could you tell how to send the same via thew SPI, is it a different procedure or an extension of the flash program,
Thanks,
"Could you tell how to send the same via thew SPI"
You already have a separate Thread on that subject. Please stick to the subject of the Thread!
"is it a different procedure or an extension of the flash program"
SPI is just an interface; you have to write a program to use it - just like you have to write a program to send & receive characters via the UART.
Your program is stored in the CODE memory space of the 8051.
" SPI is just an interface; you have to write a program to use it "
Could you give some tips as to how to write the same, Will this program be different from the one used to access the flash?
SPI is a standard interface - so start by looking for the specifications.
You may well find sufficient detail in the SST25VF512 datasheet.
Use your favourite internet search engine - there is loads of information already out there!
There are even examples here: http://www.keil.com/download/list/c51.htm
Once you have worked-out the basics of how to transfer bytes across the interface, then you have to think about what you need to do with those bytes - that is specified in the datasheets for whatever SPI device(s) you are using.
Again, it's just like using the UART - first you need the basics of how to send & receive a character, then you need to form those characters into whatever commands, responses, etc are required by your application...