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Arduboy2
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add checkBatteryLow() function

This commit is contained in:
Josh Goebel 2017-03-20 23:12:31 -04:00
parent 4ff6973a4b
commit c847c8348b
2 changed files with 36 additions and 3 deletions
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24
src/Arduboy2.cpp
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@ -130,6 +130,27 @@ void Arduboy2Base::bootLogo()
// Virtual function overridden by derived class
void Arduboy2Base::bootLogoExtra() { }
bool Arduboy2Base::checkBatteryLow() {
bool batteryLow;
uint16_t voltage;
voltage = rawADC(ADC_VOLTAGE);
power_adc_disable(); // turn the ADC back off
// some voltage values for reference
// 4262mv - fully charged (plugged in)
// 41??mv - fully charged
voltage = 1125300L / voltage;
batteryLow = voltage < 3700;
if (batteryLow) {
TXLED1;
} else {
TXLED0;
}
return batteryLow;
}
/* Frame management */
void Arduboy2Base::setFrameRate(uint8_t rate)
@ -188,13 +209,14 @@ int Arduboy2Base::cpuLoad()
void Arduboy2Base::initRandomSeed()
{
power_adc_enable(); // ADC on
randomSeed(~rawADC(ADC_TEMP) * ~rawADC(ADC_VOLTAGE) * ~micros() + micros());
power_adc_disable(); // ADC off
}
uint16_t Arduboy2Base::rawADC(uint8_t adc_bits)
{
power_adc_enable(); // ADC on
ADMUX = adc_bits;
// we also need MUX5 for temperature check
if (adc_bits == ADC_TEMP) {

15
src/Arduboy2.h
View File

@ -253,6 +253,17 @@ class Arduboy2Base : public Arduboy2Core
// information after the logo stops scrolling down.
virtual void bootLogoExtra();
/** \brief
* Checks the battery voltage level.
*
* \return true if the battery is running low
*
* \details
* This is called periodically by the frame management loop and will
* light the TX LED (yellow) if the battery is detected to be low.
*/
static bool checkBatteryLow();
/** \brief
* Clear the display buffer.
*
@ -695,7 +706,7 @@ class Arduboy2Base : public Arduboy2Core
int cpuLoad();
// Useful for getting raw approximate voltage values.
uint16_t rawADC(uint8_t adc_bits);
static uint16_t rawADC(uint8_t adc_bits);
/** \brief
* Test if the specified buttons are pressed.
@ -1074,7 +1085,7 @@ class Arduboy2 : public Print, public Arduboy2Base
*
* \details
* This function is called by the `bootLogo()` function.
*
*
* If a unit name has been saved in system EEPROM, it will be displayed at
* the bottom of the screen. This function pauses for a short time to allow
* the name to be seen.