Suggestions for database with PIC

[Naumanpak]

Experts,

Working on a GPS based project that requires a large database for speed limits and directions.

PROBLEM:

I am using MMC card being accessed via SPI in PIC18F452. But data rate is too low, can read only ~5kb of data in a second.

What else is available, Need suggestions... :|


thanks!

 

[bobcat1]

Re: Database with PIC

Hi

You can use a serial RAM (see microchip site) load it with data from MMC or SD on start up and read table from SRAM

All the best

Bobi

The microcontroller specialist

 

[Naumanpak]

Database with PIC

Hey thanks for a reply!

Seems to be the ideal solution but can I access a serial ram other than SPI.

I am using SPI to access MMC card.

Please suggest again.


thanks a bunch!!

Added after 19 minutes:

And if you can, kindly refer me an easily available 8-32 kBYTES serial RAM.


cheers

 

[Kurenai_ryu]

Database with PIC

(from the other post)

mmmm, you can't access both SPI and I2C from the same pins at the same time! you can search for a PIC controller with two MSSP (one will be for the memory, and the other for the SD) (18f46j50)

other thing is to implement software I2C, but it's not as fast, but at least, you can reach the 100kHz. this could be your best option right now...

and lastly, you can try searching for a SPI memory somthing like the 23k256 or something SPI so you can sare MOSI and MISO (SDI and SDO) but connect a different CS for both SD an RAM...