Monitor battery and alert low voltage
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@ -49,10 +49,11 @@ bool battery_charging(void)
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{
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if (!(USBSTA&(1<<VBUS))) return false;
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// MCP73831:STAT
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// HiZ: Shutdown/No Battery
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// Low: Charging
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// Hi: Charged
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// Charger Status:
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// MCP73831 MCP73832 LTC4054 Status
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// Hi-Z Hi-Z Hi-Z Shutdown/No Battery
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// Low Low Low Charging
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// Hi Hi-Z Hi-Z Charged
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// preserve last register status
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uint8_t ddrf_prev = DDRF;
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@ -68,6 +69,10 @@ bool battery_charging(void)
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DDRF = (DDRF&~(1<<5)) | (ddrf_prev&(1<<5));
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PORTF = (PORTF&~(1<<5)) | (portf_prev&(1<<5));
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// TODO: With MCP73831 this can not get stable status when charging.
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// LED is powered from PSEL line(USB or Lipo)
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// due to weak low output of STAT pin?
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// due to pull-up'd via resitor and LED?
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return charging;
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}
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@ -9,6 +9,7 @@ typedef enum {
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CHARGING,
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DISCHARGING,
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LOW_VOLTAGE,
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UNKNOWN,
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} battery_status_t;
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typedef enum {
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@ -81,13 +81,50 @@ void rn42_task(void)
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}
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}
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/* Low voltage alert */
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if (battery_status() == LOW_VOLTAGE) {
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battery_led(LED_ON);
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} else {
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battery_led(LED_CHARGER);
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static uint16_t prev_timer = 0;
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static uint8_t sec = 0;
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// NOTE: not exact 1 sec
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if (timer_elapsed(prev_timer) > 1000) {
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/* every second */
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prev_timer = timer_read();
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/* Low voltage alert */
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uint8_t bs = battery_status();
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if (bs == LOW_VOLTAGE) {
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battery_led(LED_ON);
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} else {
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battery_led(LED_CHARGER);
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}
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static uint8_t prev_status = UNKNOWN;
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if (bs != prev_status) {
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prev_status = bs;
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switch (bs) {
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case FULL_CHARGED: xprintf("FULL_CHARGED\n"); break;
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case CHARGING: xprintf("CHARGING\n"); break;
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case DISCHARGING: xprintf("DISCHARGING\n"); break;
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case LOW_VOLTAGE: xprintf("LOW_VOLTAGE\n"); break;
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default: xprintf("UNKNOWN STATUS\n"); break;
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};
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}
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/* every minute */
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if (sec == 0) {
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uint32_t t = timer_read32()/1000;
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uint16_t v = battery_voltage();
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uint8_t h = t/3600;
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uint8_t m = t%3600/60;
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uint8_t s = t%60;
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xprintf("%02u:%02u:%02u\t%umV\n", h, m, s, v);
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/* TODO: xprintf doesn't work for this.
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xprintf("%02u:%02u:%02u\t%umV\n", (t/3600), (t%3600/60), (t%60), v);
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*/
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}
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sec++; sec = sec%60;
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}
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/* Connection monitor */
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if (rn42_linked()) {
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status_led(true);
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