Pico and SPI

[veebch]

First of all, thanks a million for making such a comprehensive tool.

I am a total novice at things this low-level, so forgive the very basic question. I'm struggling to get up and running on a pico with a (128x128) ssd1351 screen. I am thinking that my configuration of the color_setup.py may be wrong.

This is a snippet from my color_setup.py that I think may be the issue:

` height = 128 # 1.5 inch 128*128 display

pdc = machine.Pin(20, machine.Pin.OUT) pcs = machine.Pin(17, machine.Pin.OUT) prst = machine.Pin(21, machine.Pin.OUT) spi = machine.SPI(0) gc.collect() # Precaution before instantiating framebuf ssd = SSD(spi, pcs, pdc, prst, height) # Create a display instance `

Is there a glaring error in this?

[peterhinch]

It looks good but it's best to specify the initial value of pins:

pdc = machine.Pin(20, machine.Pin.OUT, value=0)
pcs = machine.Pin(17, machine.Pin.OUT, value=1)
prst = machine.Pin(21, machine.Pin.OUT, value=1)

Are you using the right pins for SPI(0) (6 and 7)?

What actually happens when you try to run one of the demos?

[veebch]

Hey Peter, thanks for taking a look, greatly appreciated.

The demo doesn't complain, so next step is to check whether I'm using the right pins. My two maxims for any issue with electronics: Check the wires It's my fault :)

[veebch]

Working! in color_setup.py, I replaced spi=machine.SPI(0) with

spi = machine.SPI(0,
                  baudrate=1000000,
                  polarity=1,
                  phase=1,
                  bits=8,
                  firstbit=machine.SPI.MSB,
                  sck=machine.Pin(18),
                  mosi=machine.Pin(19),
                  miso=machine.Pin(16))