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Clear battery cache in ShowBattery app #37

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Merged
ThomasFarstrike merged 1 commit into from
Feb 14, 2026
Merged

Clear battery cache in ShowBattery app #37

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2 changes: 1 addition & 1 deletion internal_filesystem/apps/com.micropythonos.showbattery/META-INF/MANIFEST.JSON
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@
"icon_url": "https://apps.micropythonos.com/apps/com.micropythonos.showbattery/icons/com.micropythonos.showbattery_0.1.1_64x64.png",
"download_url": "https://apps.micropythonos.com/apps/com.micropythonos.showbattery/mpks/com.micropythonos.showbattery_0.1.1.mpk",
"fullname": "com.micropythonos.showbattery",
"version": "0.1.1",
"version": "0.2.0",
"category": "development",
"activities": [
{
Expand Down
31 changes: 22 additions & 9 deletions internal_filesystem/apps/com.micropythonos.showbattery/assets/show_battery.py
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Original file line number Diff line number Diff line change
Expand Up @@ -40,8 +40,7 @@
"""

import lvgl as lv
import time

import mpos.time
from mpos import Activity, BatteryManager

HISTORY_LEN = 60
Expand All @@ -56,11 +55,13 @@ class ShowBattery(Activity):
# Widgets
lbl_time = None
lbl_sec = None
lbl_date = None
lbl_text = None

bat_outline = None
bat_fill = None

clear_cache_checkbox = None # Add reference to checkbox

history_v = []
history_p = []

Expand All @@ -69,16 +70,21 @@ def onCreate(self):

# --- TIME ---
self.lbl_time = lv.label(scr)
self.lbl_time.set_style_text_font(lv.font_montserrat_48, 0)
self.lbl_time.set_style_text_font(lv.font_montserrat_40, 0)
self.lbl_time.align(lv.ALIGN.TOP_LEFT, 5, 5)

self.lbl_sec = lv.label(scr)
self.lbl_sec.set_style_text_font(lv.font_montserrat_24, 0)
self.lbl_sec.align_to(self.lbl_time, lv.ALIGN.OUT_RIGHT_BOTTOM, 24, -4)

self.lbl_date = lv.label(scr)
self.lbl_date.set_style_text_font(lv.font_montserrat_24, 0)
self.lbl_date.align(lv.ALIGN.TOP_LEFT, 5, 60)
# --- CHECKBOX ---
self.clear_cache_checkbox = lv.checkbox(scr)
self.clear_cache_checkbox.set_text("Real-time values")
self.clear_cache_checkbox.align(lv.ALIGN.TOP_LEFT, 5, 50)

self.lbl_text = lv.label(scr)
self.lbl_text.set_style_text_font(lv.font_montserrat_16, 0)
self.lbl_text.align(lv.ALIGN.TOP_LEFT, 5, 80)

# --- BATTERY ICON ---
self.bat_outline = lv.obj(scr)
Expand Down Expand Up @@ -126,19 +132,26 @@ def onResume(self, screen):
super().onResume(screen)

def update(timer):
now = time.localtime()
now = mpos.time.localtime()

hour, minute, second = now[3], now[4], now[5]
date = f"{now[0]}-{now[1]:02}-{now[2]:02}"

if self.clear_cache_checkbox.get_state() & lv.STATE.CHECKED:
# Get "real-time" values by clearing the cache before reading
BatteryManager.clear_cache()

voltage = BatteryManager.read_battery_voltage()
percent = BatteryManager.get_battery_percentage()

# --- TIME ---
self.lbl_time.set_text(f"{hour:02}:{minute:02}")
self.lbl_sec.set_text(f":{second:02}")

# --- BATTERY VALUES ---
date += f"\n{voltage:.2f}V {percent:.0f}%"
self.lbl_date.set_text(date)
date += f"\nRaw ADC: {BatteryManager.read_raw_adc()}"
self.lbl_text.set_text(date)

# --- BATTERY ICON ---
fill_h = int((percent / 100) * (self.bat_size * 0.9))
Expand Down
20 changes: 17 additions & 3 deletions internal_filesystem/lib/mpos/board/odroid_go.py
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Original file line number Diff line number Diff line change
Expand Up @@ -48,7 +48,6 @@
# Misc settings:
LED_BLUE = const(2)
BATTERY_PIN = const(36)
BATTERY_RESISTANCE_NUM = const(2)
SPEAKER_ENABLE_PIN = const(25)
SPEAKER_PIN = const(26)

Expand Down Expand Up @@ -105,8 +104,22 @@
from mpos import BatteryManager


def adc_to_voltage(adc_value):
return adc_value * BATTERY_RESISTANCE_NUM
def adc_to_voltage(raw_adc_value):
"""
The percentage calculation uses MIN_VOLTAGE = 3.15 and MAX_VOLTAGE = 4.15
0% at 3.15V -> raw_adc_value = 270
100% at 4.15V -> raw_adc_value = 310

4.15 - 3.15 = 1V
310 - 270 = 40 raw ADC steps

So each raw ADC step is 1V / 40 = 0.025V
Offset calculation:
270 * 0.025 = 6.75V. but we want it to be 3.15V
So the offset is 3.15V - 6.75V = -3.6V
"""
voltage = raw_adc_value * 0.025 - 3.6
return voltage


BatteryManager.init_adc(BATTERY_PIN, adc_to_voltage)
Expand Down Expand Up @@ -183,6 +196,7 @@ def input_callback(indev, data):
current_key = lv.KEY.ESC
elif button_volume.value() == 0:
print("Volume button pressed -> reset")
blue_led.on()
machine.reset()
elif button_select.value() == 0:
current_key = lv.KEY.BACKSPACE
Expand Down
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