Flowcode Support Board

Absolutely Ben, faster. Now I will try to test spi with ESP32. Can´t get it fast enough

Now I see in the configuration for the ILI9341 SPI component it is not possible to select "Use pin reference" like in the serial ILI component or am I not looking the rigth place?

Br. Jorgen

Hi Jorgen,

For the SPI remap pins, sorry no this is currently not possible.

However it should be fairly simple to work out. PortA is GPIO pins 0-31 so PortA 19 would be GPIO 19. PortB is GPIO pins 32-63 so PortB 2 would be GPIO 34.

Hope this makes sense.

OK Thank´s Ben!

Now I perform a test with Ili9341 SPI. It is extreeeeem slow?

Jorgen

Hi Jorgen,

The Prescale property sets how fast the SPI is output. It's currently at 400KHz in your program but can go a lot faster. I suggest trying it at 10MHz and see how you get on.

Already done Ben. I try to step up to 30 Mhz max. over this the display stop working, But still not so fast as the as the serial.

If I measure with a scope on the MISO pin I don´t see any signal, and even if I remove the pin it still work, but slow compared with serial.

Jorgen

Hi Jorgen,

Let me do some more testing and I'll see if I can find another bottleneck for you. The SPI is currently being run byte by byte but the ESP chip can work with SPI in transaction mode where you queue up a load of bytes and then let it go. This might be the way to let it run faster. 30MHz is a lot faster then the software version will go by say a factor of at least 10 so there must be a bottleneck somewhere.

I'll have a play and let you know.

If I measure with a scope on the MISO pin I don´t see any signal

For the GLCD MISO isn't used it's just the MOSI and the SCK.

Thank you Ben. Look forward to see

Jorgen.

It's pretty much as I had imagined, the SPI is faster but the overhead is killing it.

The top trace shows the software driven display and the bottom trace shows the SPI version @ 10MHz.
I'll keep chipping away at it.

I've pushed a new version of the SPI display component which should be a lot faster.

I have a program that just clears each display version,

Using the new SPI display component the clear is now a lot faster, 630ms for the serial component vs 75ms for the SPI version @ 25MHz.
It will be interesting to see how it gets on with a test that's drawing data to the display. I've optimised where I can so hopefully it is still as fast if not faster.

Hi Ben!
Thank you
Run an update, but sorry now it doesn´t work at all

I try to set the prescaler from 100 khZ and up to 25 mHz, bu it is not working at all. I try to go back to previus version 10 it work again. But slow.

Do you have an ILI9341 Spi display for test?

Br jorgen