Need st7789 help.

[ccpetersen]

I have a Waveshare PicoLCD 1.14 which I'm trying to get working with an rpi pico or pico2. Both behave the same way. My code gets to the Config sections and blocks never to return.

`package main

import (
"image/color"

"machine"

"time"

"tinygo.org/x/drivers/st7789"

)

// Define your specific pin assignments here
const (
SPI_SCK = machine.GP10 // clock
SPI_SDO = machine.GP11 // data
SPI_CS = machine.GP9 // select
LCD_DC = machine.GP8 // data/command
LCD_RST = machine.GP12 // reset
LCD_BL = machine.GP13 // lcd backlight
)

var display st7789.Device

func main() {

time.Sleep(time.Second * 2) // delay for monitor connections

println("  configure SPI...")

machine.SPI1.Configure(machine.SPIConfig{
	Frequency: 24_000_000, // Adjust frequency as needed
	SCK:       SPI_SCK,
	SDO:       SPI_SDO,
	Mode:      0,
})

println("  create st7789 driver instance...")

// Create ST7789 driver instance
display := st7789.New(machine.SPI1, LCD_RST, LCD_DC, SPI_CS, LCD_BL)

println("  configure display...")

// Configure display parameters
display.Configure(st7789.Config{
	Width:    135,
	Height:   240,
	Rotation: st7789.NO_ROTATION,
	//FrameRate: st7789.FRAMERATE_60,
	//RowOffset:    0,
	//ColumnOffset: 0,
})

println("  display configured...")

red := color.RGBA{255, 0, 0, 255}

// Example: Fill screen with a color
display.FillScreen(red)

time.Sleep(time.Second)
display.FillScreen(color.RGBA{0, 255, 0, 255})
time.Sleep(time.Second * 1)

// Example: Draw a string
//display.DrawText(10, 10, "Hello TinyGo!", st7789.WHITE, st7789.BLACK)

for {
	// Keep the program running
	time.Sleep(time.Second * 5)
	println("  sleeping...")
}

}`

Any help would be much appreciated.

[squirrelbob]

I'm just guessing here, but comparing your code to mine, that is working fine with st7789, I can only see 2 differences:

1. I'm configuring these pins as outputs:

LCD_RST.Configure(machine.PinConfig{Mode: machine.PinOutput})
LCD_DC.Configure(machine.PinConfig{Mode: machine.PinOutput})
SPI_CS.Configure(machine.PinConfig{Mode: machine.PinOutput})
LCD_BL.Configure(machine.PinConfig{Mode: machine.PinOutput})

2. I'm using Frequency: 62_500_000, but 24_000_000 should probably also work just fine.

Otherwise your code looks good and should go pass the configuration step if there are no mechanical issues.

[ccpetersen]

I should have mentioned that my setup runs with Micropython and Circuitpython so it should be OK.

Looking in the driver the port setup is done in func NewOf() but I'll add your suggestion and see how it goes.

Thanks for your help

[ccpetersen]

Alas that didn't make any difference.

Thanks for taking the time to look.

[eliasnaur]

Can you try tinygo gdb or some other way to determine how far the driver initializes? I don't see where in Configure your code might block. You may be getting a panic somewhere, and TinyGo has a tendency to lock up before the panic reaches the output.

FWIW, you can clone tinygo-drivers and set up go.work (with go work use <your program module> <path/to/cloned/tinygo-drivers>) to enable local changes to the driver code.

[ccpetersen]

My bad, it's not blocking. I took out the "-monitor" in the command "tinygo flash -target=pico main.go" and the println() now it just exits after a time. Nothing on the display so I assume there is a panic after the config call in main.go.

I don't know how to use gdb so I'm stuck.

Thanks for your help.

[ccpetersen]

Update and new question: I've found a couple of st7789 drivers written in C so my projects can move forward.

In an effort to find out why I can't get the tineygo st7789 driver working I was going to use, as suggested here, gdb. So I tried this which didn't work. Main.go is the file above.
Can anyone tell me whats wrong?

tinygo gdb -target=pico main.go

Reading symbols from /tmp/tinygo2367773633/main...
:3333: Connection timed out.
"monitor" command not supported by this target.
You can't do that when your target is `exec'

[eliasnaur]

If you can get a C driver to work with TinyGo, I guess it's more productive to port that driver, or diff the Go and C driver to see what they're doing differently.