From 40ba07108ac18f7bdadaa90cb3246a6a677a0b71 Mon Sep 17 00:00:00 2001
From: Phil Howard <github@gadgetoid.com>
Date: Mon, 23 Sep 2024 15:30:11 +0100
Subject: [PATCH] Bake a very simple library into the firmware.

---
 modules/default.txt            |  2 +-
 modules/py_frozen/boot.py      |  6 +++++
 modules/py_frozen/explorer.py  | 42 ++++++++++++++++++++++++++++++++++
 modules/py_littlefs/example.py |  2 --
 4 files changed, 49 insertions(+), 3 deletions(-)
 create mode 100644 modules/py_frozen/explorer.py
 delete mode 100644 modules/py_littlefs/example.py

diff --git a/modules/default.txt b/modules/default.txt
index 8d75d26..079af51 100644
--- a/modules/default.txt
+++ b/modules/default.txt
@@ -1 +1 @@
-example.py
\ No newline at end of file
+multi-sensor-breakout/*.py
\ No newline at end of file
diff --git a/modules/py_frozen/boot.py b/modules/py_frozen/boot.py
index 46e338c..0da3f85 100644
--- a/modules/py_frozen/boot.py
+++ b/modules/py_frozen/boot.py
@@ -1,3 +1,9 @@
+import builtins
 import cppmem
+import explorer
+
+for k, v in explorer._exports.items():
+    setattr(builtins, k, v)
+
 # Switch C++ memory allocations to use MicroPython's heap
 cppmem.set_mode(cppmem.MICROPYTHON)
diff --git a/modules/py_frozen/explorer.py b/modules/py_frozen/explorer.py
new file mode 100644
index 0000000..1bb75f2
--- /dev/null
+++ b/modules/py_frozen/explorer.py
@@ -0,0 +1,42 @@
+from picographics import PicoGraphics, DISPLAY_EXPLORER, PEN_RGB565
+from machine import Pin
+from micropython import const
+
+# We're only using a few colours so we can use a 4 bit/16 colour palette and save RAM!
+display = PicoGraphics(display=DISPLAY_EXPLORER, pen_type=PEN_RGB565)
+
+BUTTON_A_PIN = const(16)
+BUTTON_B_PIN = const(15)
+BUTTON_C_PIN = const(14)
+BUTTON_X_PIN = const(17)
+BUTTON_Y_PIN = const(18)
+BUTTON_Z_PIN = const(19)
+
+BLACK = display.create_pen(0, 0, 0)
+WHITE = display.create_pen(255, 255, 255)
+CYAN = display.create_pen(0, 255, 255)
+MAGENTA = display.create_pen(255, 0, 255)
+YELLOW = display.create_pen(255, 255, 0)
+RED = display.create_pen(255, 0, 0)
+GREEN = display.create_pen(0, 255, 0)
+BLUE = display.create_pen(0, 0, 255)
+
+_button_a = Pin(BUTTON_A_PIN, Pin.IN, Pin.PULL_UP)
+_button_b = Pin(BUTTON_B_PIN, Pin.IN, Pin.PULL_UP)
+_button_c = Pin(BUTTON_C_PIN, Pin.IN, Pin.PULL_UP)
+_button_x = Pin(BUTTON_X_PIN, Pin.IN, Pin.PULL_UP)
+_button_y = Pin(BUTTON_Y_PIN, Pin.IN, Pin.PULL_UP)
+_button_z = Pin(BUTTON_Z_PIN, Pin.IN, Pin.PULL_UP)
+
+_exports = {
+    "BLACK": BLACK,
+    "WHITE": WHITE,
+    "CYAN": CYAN,
+    "MAGENTA": MAGENTA,
+    "YELLOW": YELLOW,
+    "RED": RED,
+    "GREEN": GREEN,
+    "BLUE": BLUE,
+    "text": display.text,
+    "pen": display.set_pen
+}
\ No newline at end of file
diff --git a/modules/py_littlefs/example.py b/modules/py_littlefs/example.py
deleted file mode 100644
index 51bd8e8..0000000
--- a/modules/py_littlefs/example.py
+++ /dev/null
@@ -1,2 +0,0 @@
-# This file should be added to the user-facing MicroPython filesystem
-print("Hello World")
\ No newline at end of file