diff options
| author | tmk <nobody@nowhere> | 2014-09-20 06:12:49 +0900 |
|---|---|---|
| committer | tmk <nobody@nowhere> | 2014-09-20 06:12:49 +0900 |
| commit | 2015027da325e9f9b602af1f36ceeeebbcd6c78d (patch) | |
| tree | 65e9f6606bf256ce260475aff1ea4eb0c3ba901b /keyboard | |
| parent | d8dd18b4217ce56ee3248e3b09598196e0b6731c (diff) | |
Add FET swtich for battery ADC
Diffstat (limited to 'keyboard')
| -rw-r--r-- | keyboard/hhkb_rn42/MEMO.txt | 7 | ||||
| -rw-r--r-- | keyboard/hhkb_rn42/rn42/battery.c | 12 |
2 files changed, 19 insertions, 0 deletions
diff --git a/keyboard/hhkb_rn42/MEMO.txt b/keyboard/hhkb_rn42/MEMO.txt index 11f64b8c4c..2f61574c30 100644 --- a/keyboard/hhkb_rn42/MEMO.txt +++ b/keyboard/hhkb_rn42/MEMO.txt @@ -15,12 +15,19 @@ Power saving: - deep sleep MCU and BT module(keyboard is not used for long time) - deep sleep MCU and turn off BT module(keyboard is not used and not connected) - Battery ADC; switching, high resistance + - switching gnd end of divider with PF4 + - high resistor 100K/1M? + capacitor 10nF + http://www.eevblog.com/forum/beginners/measuring-battery-voltage-without-consuming-current/ Improving: - BT LED; connecting, linked, sleeping, deep sleeping - Battry LED; blink(using timer?) - move rn42 to protocol directory when it becomes reusable stack - LUFA sendchar should be buffered and serial_uart.c buffur size is too large(256). +- ADC resolution + AVR120 + AVR32138 Testing: - Factroy reset doesn't work; need to **test again** 10K pull-up is too high? diff --git a/keyboard/hhkb_rn42/rn42/battery.c b/keyboard/hhkb_rn42/rn42/battery.c index c6988fe336..0320e1baf1 100644 --- a/keyboard/hhkb_rn42/rn42/battery.c +++ b/keyboard/hhkb_rn42/rn42/battery.c @@ -21,6 +21,10 @@ void battery_init(void) ADMUX = (1<<REFS1) | (1<<REFS0); ADCSRA = (1<<ADPS2) | (1<<ADPS1) | (1<<ADPS0); ADCSRA |= (1<<ADEN); + + // ADC disable voltate divider(PF4) + DDRF |= (1<<4); + PORTF &= ~(1<<4); } // Indicator for battery @@ -79,6 +83,10 @@ bool battery_charging(void) // Returns voltage in mV uint16_t battery_voltage(void) { + // ADC disable voltate divider(PF4) + DDRF |= (1<<4); + PORTF |= (1<<4); + volatile uint16_t bat; //ADCSRA |= (1<<ADEN); @@ -98,6 +106,10 @@ uint16_t battery_voltage(void) //ADCSRA &= ~(1<<ADEN); + // ADC disable voltate divider(PF4) + DDRF |= (1<<4); + PORTF &= ~(1<<4); + return (bat - BATTERY_ADC_OFFSET) * BATTERY_ADC_RESOLUTION; } |