Re: Microcontroller with QVGA or VGA LCD controller

"David Brown" <david.brown@xxxxxxxxxxxxxxxxxxxxxxxxxx> skrev i meddelandet
news:47c74cf0$0$14998$8404b019@xxxxxxxxxxxxxxxxxx
Ulf Samuelsson wrote:
"David Brown" <david@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx> skrev i meddelandet
news:47c6914b$0$15004$8404b019@xxxxxxxxxxxxxxxxxx
Ulf Samuelsson wrote:
"David Brown" <david@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx> skrev i meddelandet
news:47c56945$0$14989$8404b019@xxxxxxxxxxxxxxxxxx
donald wrote:
David Brown wrote:
Does anyone have any recommendations for microcontrollers with LCD
controllers for QVGA (320x240) or full VGA (640x480) displays?

I've found a few large devices (a ColdFire v3 device, and a number
of ARM9's from Atmel) that have LCD controllers supporting much
larger screens, but these are pretty big and fast microcontrollers,
with large pin counts and needing sizeable external memories.

I'm hoping to find something a bit smaller and cheaper, and easier
to work with.
<snip>

[snip]
It's just that a card using a 200-300 pin bga 200+ MHz processor and
matching memory is going to be a lot more expensive to design and
produce than one using a 140-pin TQFP 50+ MHz processor.


If you shoot for QVGA graphic and 8 bit per pixel, you will need
75 kB for the screen, and this leaves 85 kB for the controller
in the AT91SAM9261. It is not double buffered of course...

The part will need an SPI flash to boot using AT45 flash.
Only 4 pins needed to communicate.

While the part has 217 pins, you can probably ignore the
absolute majority of the pins, simplifying the layout.
You do not need any parallel RAM memory
which would be required for the ARM7 stuff.

Fonts etc can be in the dataflash and it can
accessed using DMA (PDC) at 4 MByte/second.

Even if the part runs at 200 MHz, you can still run it at 50 MHz.


That's all true enough, and is certainly one way to go. We are leaning
towards the Epson controllers at the moment, however - then we can use a
microcontroller with which we are familiar (a ColdFire v2, probably). Even
simplified, using an AT91SAM9 means a fair amount of learning.

Plan for a redesign in 2-3 years.

--
Best Regards,
Ulf Samuelsson
This is intended to be my personal opinion which may,
or may not be shared by my employer Atmel Nordic AB


.

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