hi all,
i am building a project using an 8052 controller and find myself with 4 free pins.
the project is a navigation system.
the question is this, without purchasing any additional equipment such as ic's would it be possible to get the project to write a text file (*.txt) to a usb stick or even a computer?
its just an add on i would like to put in there, any help would be appretiated.

 

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You need a USB host to talk to a flash drive. A USB OTG micro will work but the ancient 8052 will not.

 

If you planned your design so that your spare pins where the uart, then your almost there in regards to serial communication with a PC. For USB, you will need host capabilities to enumerate a storage device. On the otherhand, you could bitbang an SD storage.

 

thanks for the help, how would bitbanging an sd storage work? the controller is an at80c52

 

You need to write 512 bytes at a time to use an SD card. They use SPI.

 

You need to write 512 bytes at a time to use an SD card. They use SPI.

But for a SD card with FAT 16 or 32 it is not trivial. Unless you have a C library to lean on.

 

But for a SD card with FAT 16 or 32 it is not trivial. Unless you have a C library to lean on.

So the short answer is no. The 8052 is just too old.

 

You need to write 512 bytes at a time to use an SD card. They use SPI.

With a non-SDHC SD card you can address it to the byte level so you don't need 512 byte transfers when using SPI.

http://forum.allaboutcircuits.com/showthread.php?t=41474