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Monitor battery and alert low voltage

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This commit is contained in:
tmk 2014-09-04 17:08:23 +09:00
parent 02939ab1d8
commit 3b81ffc16c
3 changed files with 52 additions and 9 deletions
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13
keyboard/hhkb_rn42/rn42/battery.c
View file

@ -49,10 +49,11 @@ bool battery_charging(void)
{
if (!(USBSTA&(1<<VBUS))) return false;
// MCP73831:STAT
// HiZ: Shutdown/No Battery
// Low: Charging
// Hi: Charged
// Charger Status:
// MCP73831 MCP73832 LTC4054 Status
// Hi-Z Hi-Z Hi-Z Shutdown/No Battery
// Low Low Low Charging
// Hi Hi-Z Hi-Z Charged
// preserve last register status
uint8_t ddrf_prev = DDRF;
@ -68,6 +69,10 @@ bool battery_charging(void)
DDRF = (DDRF&~(1<<5)) | (ddrf_prev&(1<<5));
PORTF = (PORTF&~(1<<5)) | (portf_prev&(1<<5));
// TODO: With MCP73831 this can not get stable status when charging.
// LED is powered from PSEL line(USB or Lipo)
// due to weak low output of STAT pin?
// due to pull-up'd via resitor and LED?
return charging;
}

1
keyboard/hhkb_rn42/rn42/battery.h
View file

@ -9,6 +9,7 @@ typedef enum {
CHARGING,
DISCHARGING,
LOW_VOLTAGE,
UNKNOWN,
} battery_status_t;
typedef enum {

47
keyboard/hhkb_rn42/rn42/rn42_task.c
View file

@ -81,13 +81,50 @@ void rn42_task(void)
}
}
/* Low voltage alert */
if (battery_status() == LOW_VOLTAGE) {
battery_led(LED_ON);
} else {
battery_led(LED_CHARGER);
static uint16_t prev_timer = 0;
static uint8_t sec = 0;
// NOTE: not exact 1 sec
if (timer_elapsed(prev_timer) > 1000) {
/* every second */
prev_timer = timer_read();
/* Low voltage alert */
uint8_t bs = battery_status();
if (bs == LOW_VOLTAGE) {
battery_led(LED_ON);
} else {
battery_led(LED_CHARGER);
}
static uint8_t prev_status = UNKNOWN;
if (bs != prev_status) {
prev_status = bs;
switch (bs) {
case FULL_CHARGED: xprintf("FULL_CHARGED\n"); break;
case CHARGING: xprintf("CHARGING\n"); break;
case DISCHARGING: xprintf("DISCHARGING\n"); break;
case LOW_VOLTAGE: xprintf("LOW_VOLTAGE\n"); break;
default: xprintf("UNKNOWN STATUS\n"); break;
};
}
/* every minute */
if (sec == 0) {
uint32_t t = timer_read32()/1000;
uint16_t v = battery_voltage();
uint8_t h = t/3600;
uint8_t m = t%3600/60;
uint8_t s = t%60;
xprintf("%02u:%02u:%02u\t%umV\n", h, m, s, v);
/* TODO: xprintf doesn't work for this.
xprintf("%02u:%02u:%02u\t%umV\n", (t/3600), (t%3600/60), (t%60), v);
*/
}
sec++; sec = sec%60;
}
/* Connection monitor */
if (rn42_linked()) {
status_led(true);