inky73: Add busy wait timeout.

Add a timeout to fix Inky 7.3" hanging on batteries.

Basically assumes the update has finished if it takes > 45s, and allows a subsequent attempt
rather than hanging indefinitely.

Raised, texted and fixed by w3stbam: https://github.com/pimoroni/pimoroni-pico/pull/900

Rewritten as mentioned in the PR.

drivers/inky73/inky73.cpp

@@ -47,8 +47,9 @@ namespace pimoroni {
     return !(sr.read() & 128);
   }
   
-  void Inky73::busy_wait() {
-    while(is_busy()) {
+  void Inky73::busy_wait(uint timeout_ms) {
+    absolute_time_t timeout = make_timeout_time_ms(timeout_ms);
+    while(is_busy() && !time_reached(timeout)) {
       tight_loop_contents();
     }
   }

drivers/inky73/inky73.hpp

@@ -70,7 +70,7 @@ namespace pimoroni {
     // Methods
     //--------------------------------------------------
   public:
-    void busy_wait();
+    void busy_wait(uint timeout_ms=45000);
     void reset();
     void power_off();
   

libraries/cosmic_unicorn/cosmic_unicorn.cpp

@@ -494,11 +494,14 @@ namespace pimoroni {
   void CosmicUnicorn::set_brightness(float value) {
     value = value < 0.0f ? 0.0f : value;
     value = value > 1.0f ? 1.0f : value;
+    // Max brightness is - in fact - 256 since it's applied with:
+    // result = (channel * brightness) >> 8
+    // eg: (255 * 256) >> 8 == 255
     this->brightness = floor(value * 256.0f);
   }
 
   float CosmicUnicorn::get_brightness() {
-    return this->brightness / 255.0f;
+    return this->brightness / 256.0f;
   }
 
   void CosmicUnicorn::adjust_brightness(float delta) {

libraries/galactic_unicorn/galactic_unicorn.cpp

@@ -488,11 +488,14 @@ namespace pimoroni {
   void GalacticUnicorn::set_brightness(float value) {
     value = value < 0.0f ? 0.0f : value;
     value = value > 1.0f ? 1.0f : value;
+    // Max brightness is - in fact - 256 since it's applied with:
+    // result = (channel * brightness) >> 8
+    // eg: (255 * 256) >> 8 == 255
     this->brightness = floor(value * 256.0f);
   }
 
   float GalacticUnicorn::get_brightness() {
-    return this->brightness / 255.0f;
+    return this->brightness / 256.0f;
   }
 
   void GalacticUnicorn::adjust_brightness(float delta) {

libraries/stellar_unicorn/stellar_unicorn.cpp

@@ -485,11 +485,14 @@ namespace pimoroni {
   void StellarUnicorn::set_brightness(float value) {
     value = value < 0.0f ? 0.0f : value;
     value = value > 1.0f ? 1.0f : value;
+    // Max brightness is - in fact - 256 since it's applied with:
+    // result = (channel * brightness) >> 8
+    // eg: (255 * 256) >> 8 == 255
     this->brightness = floor(value * 256.0f);
   }
 
   float StellarUnicorn::get_brightness() {
-    return this->brightness / 255.0f;
+    return this->brightness / 256.0f;
   }
 
   void StellarUnicorn::adjust_brightness(float delta) {

micropython/examples/breakout_ltr559/interrupt.py

@@ -0,0 +1,30 @@
+import time
+from machine import Pin
+from pimoroni_i2c import PimoroniI2C
+from breakout_ltr559 import BreakoutLTR559
+
+PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
+PINS_PICO_EXPLORER = {"sda": 20, "scl": 21}
+PIN_INTERRUPT = 22  # 3 for Breakout Garden
+
+i2c = PimoroniI2C(**PINS_PICO_EXPLORER)
+ltr = BreakoutLTR559(i2c, interrupt=PIN_INTERRUPT)
+interrupt = Pin(PIN_INTERRUPT, Pin.IN, Pin.PULL_DOWN)
+
+ltr.light_threshold(0, 10)  # COUNTS, NOT LUX!!!
+ltr.proximity_threshold(0, 10)
+
+
+def read(pin):
+    reading = ltr.get_reading()
+    if reading is not None:
+        print("T: ", time.ticks_ms(), " Lux: ", reading[BreakoutLTR559.LUX], " Prox: ", reading[BreakoutLTR559.PROXIMITY])
+
+
+interrupt.irq(trigger=Pin.IRQ_RISING, handler=read)
+
+part_id = ltr.part_id()
+print("Found LTR559. Part ID: 0x", '{:02x}'.format(part_id), sep="")
+
+while True:
+    pass