from machine import ADC
import time
import GFX_LCD_0inch96
import seven_segment_ext as sseg

import time

adc_pin = ADC(28)

level = 0.0

def measure():
    global level
    start = time.ticks_us()
    count = 0
    temp = 0.0
    state = 0
    fcounter = 0
    hyst = 0.1

    while time.ticks_diff(time.ticks_us(), start) < 1_000_000:
        adc_value = adc_pin.read_u16()  # 16-bit read (0–65535)
       
        count += 1
        temp += adc_value

        if state == 0:
            if adc_value > mean * (1 + hyst):
                state = 1
                fcounter += 1
        else:
            if adc_value < mean * (1 - hyst):
                state = 0

    if count > 0:
        level = temp / count
    #print("count",count,"mean",mean,"fcounter",fcounter)

    return fcounter,level

tft = GFX_LCD_0inch96.GFX_LCD_0inch96()   
tft.fill(0)

def show():
    FG = tft.GREEN
    FG2 = tft.RED
    f,level=measure()
    rpm=int(f/100*33) # 100Hz vom Plattenteller bei 33Hz 
    tft.fill(0)
    sseg.draw_text(tft, str(rpm), 30, 10, w=25, h=50, color=FG)
    tft.text("RPM",100,20,FG);
    
    # signal level
    strlevel=str(int(level/65536*100))
    tft.text(strlevel+"%",100,50,FG2);
    
    tft.display()

import sys
import select

def loop_until_key():
    
    print('Press any key to stop the loop...')
    counter=0

    while True:
        show()
        if 0:
            tft.fill(0)
            a = adc_pin.read_u16()
            sseg.draw_text(tft, str(a), 30, 10, w=10, h=20, color=FG)
            tft.text(str(counter),100,20,FG)
            counter+=1
            tft.display()
            time.sleep(1)
        
        if sys.stdin in select.select([sys.stdin], [], [], 0)[0]:
            key = sys.stdin.read(1)  # Read 1 character
            print('Key pressed:', key)
            break
        

loop_until_key()