ili9341 improve test code

main.go

package main

import (
	"fmt"
	"image/color"
	"machine"
	"time"

	"tinygo.org/x/drivers/ili9341"
	"tinygo.org/x/tinyfont"
	"tinygo.org/x/tinyfont/notosans"
)

var (
	display = ili9341.NewParallel(
		machine.LCD_DATA0,
		machine.TFT_WR,
		machine.TFT_DC,
		machine.TFT_CS,
		machine.TFT_RESET,
		machine.TFT_RD,
	)

	black = color.RGBA{0, 0, 0, 255}
	white = color.RGBA{255, 255, 255, 255}
	red   = color.RGBA{255, 0, 0, 255}
	blue  = color.RGBA{0, 0, 255, 255}
	green = color.RGBA{0, 255, 0, 255}
)

func main() {

	machine.TFT_BACKLIGHT.Configure(machine.PinConfig{machine.PinOutput})

	display.Configure(ili9341.Config{})
	width, height := display.Size()

	display.FillScreen(black)
	machine.TFT_BACKLIGHT.High()

	buf := [320 * 240]uint16{}
	for {
		s1 := time.Now()
		//display.FillRectangle(0, 0, width, height, white)
		display.DrawRGBBitmap(0, 0, buf[:], width, height)
		e1 := time.Now()

		s2 := time.Now()
		display.FillRectangle(0, 0, width, height, white)
		e2 := time.Now()
		tinyfont.WriteLine(display, &notosans.Notosans12pt, 10, 10, fmt.Sprintf("%6d ms %6d ms\n",
			(e1.UnixNano()-s1.UnixNano())/1000,
			(e2.UnixNano()-s2.UnixNano())/1000,
		), color.RGBA{255, 0, 0, 255})
		time.Sleep(100 * time.Millisecond)
	}

}