as7343: Fix channel and status order.

[Gadgetoid]

The astatus value was being interpreted as FZ, F2 and F1 causing bizarre readings and all other channels to be shifted one place.

Additionally the datasheet has been updated to re-order F5, F7 and F8 to F7, F8, F5, so these channels have been re-ordered accordingly.

Note: This will turn sensor output from confusing abject nonsense into what looks like pretty reasonable colour data and fixes #989.

[Gadgetoid]

Tested with the code from the issue:

from breakout_as7343 import BreakoutAS7343
from pimoroni_i2c import PimoroniI2C
from picographics import PicoGraphics, DISPLAY_PICO_W_EXPLORER, PEN_P4
from pimoroni import Button
import time

i2c = PimoroniI2C(sda=20, scl=21)

as7343 = BreakoutAS7343(i2c)

as7343.set_gain(1024)
as7343.set_measurement_time(33)  # Roughly 30fps at 16ms/measurement
as7343.set_integration_time(27800)
as7343.set_channels(18)

button_a = Button(12)
button_b = Button(13)
button_x = Button(14)
button_y = Button(15)

display = PicoGraphics(display=DISPLAY_PICO_W_EXPLORER, pen_type=PEN_P4, rotate=270)
display.set_font("bitmap8")
display.set_backlight(0.5)


WIDTH, HEIGHT = display.get_bounds()
#WIDTH = 240
#HEIGHT = 240
#the above call doesn't get this for the display_pico_explorer

print (WIDTH, HEIGHT)

BLACK = display.create_pen(0, 0, 0)

FZ = display.create_pen(0, 70, 255)
FY = display.create_pen(179, 255, 0)
FXL = display.create_pen(255, 190, 0)
NIR = display.create_pen(97, 0, 0)
F2 = display.create_pen(84, 0, 255)
F3 = display.create_pen(0, 192, 255)
F4 = display.create_pen(31, 255, 0)
F6 = display.create_pen(255, 33, 0)
F1 = display.create_pen(130, 0, 200)
F5 = display.create_pen(163, 255, 0)
F7 = display.create_pen(255, 0, 0)
F8 = display.create_pen(171, 0, 0)

WHITE = display.create_pen(255, 255, 255)


BAR_WIDTH = 16
BAR_SPACING = 4
MARGIN = display.measure_text("NIR") + 2
BAR_HEIGHT = WIDTH - MARGIN

OFFSET_LEFT = int((HEIGHT - 110 - ((BAR_WIDTH + BAR_SPACING) * 12)) / 2)

# Starting max values for auto-ranging
# From figure 8 of the datasheet
# F3 in pos 6 was 962 but gave overrange
# F5 in pos 10 was 1967 but also overrange
MAX_VALUES = [
    2711,
    4684,
    5970,
    13226,
    2371,
    5000,
    3926,
    4170,
    7760,
    5000,
    6774,
    1166
]

LABELS = [
    "FZ",
    "FY",
    "FXL",
    "NIR",
    "F2",
    "F3",
    "F4",
    "F6",
    "F1",
    "F5",
    "F7",
    "F8"
]

PLACE = [
    3,
    6,
    8,
    12,
    2,
    4,
    5,
    9,
    1,
    7,
    10,
    11
]


while True:
    display.set_pen(0)
    display.clear()
    readings = as7343.read()
    for i, reading in enumerate(readings):
        MAX_VALUES[i] = max(reading, MAX_VALUES[i])
        scaled = int(reading / MAX_VALUES[i] * BAR_HEIGHT)
#       y = i * (BAR_WIDTH + BAR_SPACING)
        y = PLACE[i] * (BAR_WIDTH + BAR_SPACING)
        y += OFFSET_LEFT

        display.set_pen(i + 1)
        display.rectangle(MARGIN, y, scaled, BAR_WIDTH)

        display.set_pen(WHITE)
        display.text(LABELS[i], 0, y + 1)

    display.update()
    if button_b.is_pressed:
        as7343.set_illumination_led(False)
    elif button_a.is_pressed:       
        as7343.set_illumination_current(4)
        as7343.set_illumination_led(True)
    elif button_x.is_pressed:
        as7343.set_illumination_current(10)
        as7343.set_illumination_led(True)
    time.sleep(0.01)

Used a 1 hour RGB cycle video on my phone and observed a regular pattern of red, green, blue cycling with interim colours comprising a mix of those. Seems to work well!