Guest
#1491390
Hi, I`ve a few questions about using a tft (480x272 or higher) together with the AT91SAM9263 controller. On the EBI1 bus, there`s a small PSRAM installed (needs 8 wait states). Moreover I`ve a continuous stream of incoming ethernet pkts (round about 15MBit/s) - these pkts needs to be processed in a fast way. At the moment, if the user made some changes (touch, encoder)so that the tft needs to be updated, I wrote anything direct to the PSRAM. If one step includes a lot of pictures (10 images with 230x60 pixel), the ethernet stream is discontinued for one second. I also tried to use the sdram (which is faster than the PSRAM) to update the tft - but I still get the same behaviour: all the pictures located in the sdram; What would be the best way to update the tft screen (if the user made some changes, touch, encoder and so on)? Is the usage of the dma recommended (because of the disadvantages using the link list (update after every block three registers)...)? Are there any other recommendations / hints to update big screens (800x600 pixel)? How is it possible to change the whole screen - without any kind of notice in the ethernet stream? best regards saoirse