Badger 2040: Support for multiple QR codes.

Signed-off-by: James Sutton <1068763+jpwsutton@users.noreply.github.com>

micropython/examples/badger2040/qrgen.py

@@ -1,13 +1,21 @@
 import badger2040
 import qrcode
+import time
+import os
+import badger_os
 
-
-# Open the qrcode file
+# Check that the qrcodes directory exists, if not, make it
 try:
-    text = open("qrcode.txt", "r")
+    os.mkdir("qrcodes")
 except OSError:
-    with open("qrcode.txt", "w") as text:
-        text.write("""https://pimoroni.com/badger2040
+    pass
+
+# Check that there is a qrcode.txt, if not preload
+try:
+    text = open("qrcodes/qrcode.txt", "r")
+except OSError:
+    text = open("qrcodes/qrcode.txt", "w")
+    text.write("""https://pimoroni.com/badger2040
 Badger 2040
 * 296x128 1-bit e-ink
 * six user buttons
@@ -17,20 +25,31 @@ Badger 2040
 Scan this code to learn
 more about Badger 2040.
 """)
-        text.flush()
-    text = open("qrcode.txt", "r")
+    text.flush()
+    text.seek(0)
+
+# Load all available QR Code Files
+try:
+    CODES = [f for f in os.listdir("/qrcodes") if f.endswith(".txt")]
+    TOTAL_CODES = len(CODES)
+except OSError:
+    pass
 
 
-lines = text.read().strip().split("\n")
-code_text = lines.pop(0)
-title_text = lines.pop(0)
-detail_text = lines
+print(f'There are {TOTAL_CODES} QR Codes available:')
+for codename in CODES:
+    print(f'File: {codename}')
 
 display = badger2040.Badger2040()
-display.led(128)
+
 code = qrcode.QRCode()
 
 
+state = {
+    "current_qr": 0
+}
+
+
 def measure_qr_code(size, code):
     w, h = code.get_size()
     module_size = int(size / w)
@@ -48,25 +67,75 @@ def draw_qr_code(ox, oy, size, code):
                 display.rectangle(ox + x * module_size, oy + y * module_size, module_size, module_size)
 
 
-code.set_text(code_text)
-size, _ = measure_qr_code(128, code)
-left = top = int((badger2040.HEIGHT / 2) - (size / 2))
-draw_qr_code(left, top, 128, code)
+def draw_qr_file(n):
+    display.led(128)
+    file = CODES[n]
+    codetext = open("qrcodes/{}".format(file), "r")
 
-left = 128 + 5
+    lines = codetext.read().strip().split("\n")
+    code_text = lines.pop(0)
+    title_text = lines.pop(0)
+    detail_text = lines
 
-display.thickness(2)
-display.text(title_text, left, 20, 0.5)
-display.thickness(1)
+    # Clear the Display
+    display.pen(15)  # Change this to 0 if a white background is used
+    display.clear()
+    display.pen(0)
 
-top = 40
-for line in detail_text:
-    display.text(line, left, top, 0.4)
-    top += 10
+    code.set_text(code_text)
+    size, _ = measure_qr_code(128, code)
+    left = top = int((badger2040.HEIGHT / 2) - (size / 2))
+    draw_qr_code(left, top, 128, code)
 
-display.update()
+    left = 128 + 5
+
+    display.thickness(2)
+    display.text(title_text, left, 20, 0.5)
+    display.thickness(1)
+
+    top = 40
+    for line in detail_text:
+        display.text(line, left, top, 0.4)
+        top += 10
+
+    if TOTAL_CODES > 1:
+        for i in range(TOTAL_CODES):
+            x = 286
+            y = int((128 / 2) - (TOTAL_CODES * 10 / 2) + (i * 10))
+            display.pen(0)
+            display.rectangle(x, y, 8, 8)
+            if state["current_qr"] != i:
+                display.pen(15)
+                display.rectangle(x + 1, y + 1, 6, 6)
+    display.update()
+
+
+badger_os.state_load("qrcodes", state)
+changed = not badger2040.woken_by_button()
 
-# Call halt in a loop, on battery this switches off power.
-# On USB, the app will exit when A+C is pressed because the launcher picks that up.
 while True:
+    if TOTAL_CODES > 1:
+        if display.pressed(badger2040.BUTTON_UP):
+            if state["current_qr"] > 0:
+                state["current_qr"] -= 1
+                changed = True
+
+        if display.pressed(badger2040.BUTTON_DOWN):
+            if state["current_qr"] < TOTAL_CODES - 1:
+                state["current_qr"] += 1
+                changed = True
+
+    if display.pressed(badger2040.BUTTON_B) or display.pressed(badger2040.BUTTON_C):
+        display.pen(15)
+        display.clear()
+        badger_os.warning(display, "To add QR codes, connect Badger2040 to a PC, load up Thonny, and see qrgen.py.")
+        time.sleep(4)
+        changed = True
+
+    if changed:
+        draw_qr_file(state["current_qr"])
+        badger_os.state_save("qrcodes", state)
+        changed = False
+
+    # Halt the Badger to save power, it will wake up if any of the front buttons are pressed
     display.halt()