Maybe an LPC178x but you haven't mentioned what the product is actually doing. What's on the display?
Basic user interface stuff - numeric displays, buttons, list boxes, touch keypad. Will probably include some small images. If the hardware can manage it some small animated images/icons might be a nice feature.
You don't want to write the USB Host stack yourself, do you?
I was expecting not to have to write USB stacks and hoping for free or at least cheap graphics library and design tools.
the question is : does the lcd panel have an on board controller ? meaning : you shove in data and it refreshes itself. or do you need a controller ?
The expectation was to use a panel needing a controller. Hard to see how a panel with controller is going to work out cheaper than just a panel with a bigger processor on the board. Can you point me at an example?
i;ve driven them from a STM32F102 without problems. just pick a cpu with lots of ram so you can make a frame buffer in the cpu. perform the drawing in ram first then shoot the ram to the display using a dma operation or monolithic routine.
WVGA need needs 384kB of RAM for an 8 bit colour frame buffer - what cheap microcontrollers have 384k + of RAM? I was expecting to need some S or SD RAM to support the display.
> because he says he can source the displays cheaply
Key word here is "cheaply".
Rufus what your client is looking for is cutting you out of the equation. They saw how cheap chinese tablets are and now demand the same deal from you.
I am not in that equation - I design they sub-contract manufacture in Asia already. They think they can get cheap WVGA panels serving video player and picture frame type markets not tablets and not have to design in a new panel every 12 months because supply dries up.