fix: confirm OLED alert count updates

SHA256SUMS

@@ -4,9 +4,9 @@ cd6bb5137dd5922e48866f6daf4b949a16f8fad321e77addd5b4f75181bc4248  uninstall.sh
 1c7836f80b0845fbc5c4b8570b12d736e2a3c442b1ceb5d35d48cdd518e4ad50  app/drivers/yahboom.py
 215a62acc0a5c87303d6c52c0a2585b87dfb5cdbafbe9e9e733523d48a6a9812  app/migrate.py
 72c46162c33f9587c6ccb01ad53fbaaf4ecec8cd21014b909e87e8707e253e36  app/oled_font_5x7.bin
-1803eebf7917291587204db85f74e2009e87f3a7b27a194b1aba245aa49b442b  app/runtime.py
+48755a51a15fd6a02098b185d1b17c6746502bd07dc74ac54ac76b4f8581b4db  app/runtime.py
 af4a97339c805b5471149da29699d465cb76b20a8f1da7ad8af8e32d4a2fc827  app/service.py
-413548a4b38ac3ad32712c92df5e7cd4e9ef2603872ca201d3e4df8c50dbad4a  app/settings.py
+4855303e4cd358635d4ba3877513e98042809f1ca9eaa14885ded8acadd20638  app/settings.py
 9bcac51c4e3a3d409885a3041ac121a20a48596bc47ee769c7af0b8f3772fa8d  config/pigway-cooling-hat.conf
 c373cdde2b937bbc58d4b227f3a1d2923f0816c13f1e34548ed1f3b26c101ed5  systemd/pigway-cooling-hat.service
 e3bf3e7070ea62c0526791bed922688c3fb49fee36ca9c375d080119968feb72  docs/HARDWARE_PLUGIN_API.md

app/runtime.py

@@ -167,10 +167,11 @@ class Controller:
             self.stop_event.wait(1)
 
     def oled_loop(self):
-        last=None;last_time=0
+        last=None;last_time=0;last_alert_ids=None
         while not self.stop_event.is_set():
             try:
                 v=self.view();page=v['page'];system=v['system'];network=v['network'];home=False
+                alert_ids=tuple(a['id'] for a in v['alerts'])
                 if page=='NORMAL_HOME':
                     home=True
                     ip=network.get('ip','NO IP');label=network.get('ip_label','IP4')
@@ -189,7 +190,18 @@ class Controller:
                     lines=[(a['title'],f"{index}/{len(v['alerts'])}"),(a['l2'],''),(a['l3'],''),(a['l4'],'')]
                 state=(lines,home)
                 if state!=last or self.clock()-last_time>=v['config']['oled']['refresh_seconds']:
-                    self.driver.oled(lines,home);last=state;last_time=self.clock()
+                    self.driver.oled(lines,home)
+                    # Alert recovery changes only a few header pixels (for
+                    # example 1/2 -> 1/1). Confirm that rare topology change
+                    # with a second complete frame: during undervoltage an
+                    # OLED transfer can be only partly applied without an
+                    # I2C exception being reported by the controller.
+                    if last_alert_ids is not None and alert_ids!=last_alert_ids:
+                        self.stop_event.wait(.05)
+                        if not self.stop_event.is_set():self.driver.oled(lines,home)
+                    last=state
+                    last_time=self.clock()
+                    last_alert_ids=alert_ids
                 self.recovered('oled')
             except Exception as exc:self.error('oled',exc)
             self.stop_event.wait(.1)

app/settings.py

@@ -3,7 +3,7 @@ import configparser
 import math
 from pathlib import Path
 
-VERSION = "1.0.0"
+VERSION = "1.0.1"
 PLUGIN_ID = "yahboom-cooling-hat"
 COLORS = {"red":0,"green":1,"blue":2,"yellow":3,"purple":4,"cyan":5,"white":6}
 EFFECTS = {"flow":0,"breathe":1,"marquee":2,"rainbow":3,"colorful":4}