Posted on February 23, 2017 at 08:17
I want to connect a TFT with SSD1963 Controller to a Nucleo-144 F746ZGT. If i use GPIO lines to send data to the SSD1963, everything works fine. I choose the same GPIO Pins as if I would use the FMC so i do not need different Hardware, I only Change the initialisation of the used Pins. With GPIO Pin toggling, Speed is not satifying.
So i activate the FMC, but the Timings do not fit to the Needs of the SSD1963. The CS should rise before WR/RD and D/C like during GPIO mode. But as you can see CS rises at the same time as WR and D/C .
These are the Settings for FMC. How can I adjust the Timings to get a waveform with an early CS ? Can it be done just with Software or do i Need external Hardware ? Checked several documents (DM00166116 page 172, STM32F746 datasheet, AN2784, AN2790), but did not get a clue.
Best regards,
Markus.
Posted on February 23, 2017 at 11:13
>are you using CubeMX to set it up ?
yes
> SS1963 will probably run 20x faster than your Image
GPIO is very slow (full Screen update (16bitRGB) takes 1 second),
this is the reason why i want to Switch to FMC despite GPIO works fine
>table 88 shows read Timing
read from SSD1963 is not necessary to drive the TFT, so i don't care
>table 90 show the write Timing
verfied my FMC Settings with my oscilloscope, so I noticed that there is almost no delay between
CS, WR and DC no matter which FMC Settings i tried. And the 0.5ns is a jitter which occur to all
signals , not a promised Timing value.
The SSD1963 Needs a delay of at least 1ns - tAH.
>but I haven't tried it yet..
But there are a lot of People out there who claim that STM32 and SSD1963 are working with FMC.
Still searching for a hint or answer...
Best regards,
Markus.
