>>>>> "Daniel" == Daniel O'Shea <dan@xxxxxxxxxxxxx> writes:
Daniel> Hello, this is my first message to the list and I am very happy
Daniel> to have found my way here - I want to get some opinions on an
Daniel> idea I have, to find out if it sounds like I am on the right
Daniel> track or just barking up the wrong tree! I want to use the
Daniel> FT2232H to drive a 2.4" LCD display over USB. Using Channel A in
Daniel> asynchronous bit-bang mode connected to the WR and RD pins on
Daniel> the LCD, sending 16-bit colour values for each pixel (2
Daniel> transfers per pixel in 8-bit mode).
Bit Banging is a slow interface. CPU-style FIFO ist faster, as is FT245
asynchronous FIFO and fastest is Synchronous FIFO.
Daniel> While simultaneously using
Daniel> Channel B in MPSSE mode and utilising two of the available GPIOs
Daniel> to drive the 'Chip Select' and 'Register Select' pins on the
Daniel> LCD. Here is the datasheet for the LCD driver chip:
Daniel> http://www.adafruit.com/datasheets/ILI9325.pdf
You realize that the chip is unpackaged and needs to be bonded by the
customer?
Daniel> Does this sound feasible? Can I expect the two channels on the
Daniel> FT2232H to be tightly integrated enough to have them cooperate
Daniel> in this way? and still have a usable I2C port available on
Daniel> Channel B while driving the MPSSE GPIOs at the same time?
Setting some pins to select a register on Interface B while data transfer is
on Interface A will be sloooow. You will need to make sure that the
transaction has completed on Interface B before you start the transaction on
Interface A. Both interfaces are not "tightly integrated".
Daniel> And lastly, what sort of frame rate should I be expecting per
Daniel> second, at 153,600 bytes per frame? (240 * 320 pixels * 16-bits
Daniel> per pixel / 8)
Daniel> Thank you very much for any advice and insight you can offer!
I would suggest to use some uC or programmable logic together with the
ILI9325. The uC/FPGA would connect to the ILI9325, and the FTDI would pump
data to this part. Maybe even the FTDI is not needed when the uC has a HS
USB Interface.
Bye
--
Uwe Bonnes bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
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