Posted on May 17, 2011 at 09:34The CCD camera I use is the LM9360 (national semicondictor).
It consists of 100 horizontal rows, each with 128 pixels.
After a snapshot has been taken, each pixel is converted into a 8-bit value. All the 12800 values are shifted out at the rate of a 10MHz clock.
What I want to do is connect the 8 datalines to a GPIO port. At each positive transition, the actual value at the GPIO has to be stored in memory. After 12800 clockcycles, the memory is filled with all the 8bit values.
At this moment, I use a system with a dual port memory. Adresslines of one side of the memory are connected to a hardware counter. Data lines from the memory are connected to the 8-bit port of the CCD. Each positive transistion of the clock, the data is latched into the memory, at the negative transistion, the addresscounter is incremented by one.
After 12800 clockcycles the dual port eory is filled and the processor at the other side of the dual port memory can readout all the values.
I wonder if it is possible to fill directly the STR912 memory using dma?
I hope it this is clear (English is not my native language, as you can see...)
Luc.
