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Register prometheus callback only once

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Pim van Pelt
2017-12-02 23:49:53 +01:00
parent fae52bb543
commit 84dfb7c516
1 changed files with 4 additions and 1 deletions
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3
src/widget_battery.c
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@ -6,6 +6,7 @@
#define WIDGET_BATTERY_ADC_PIN 35
static bool metrics_registered=false;
// Returns millivolts - Huzzah32 has a 1:1 voltage divider on I35 (A13)
// so it returns half of the battery voltage. Calibrate the function by
@ -64,7 +65,9 @@ void widget_battery_ev(int ev, struct widget_t *w, void *ev_data) {
case EV_WIDGET_CREATE:
LOG(LL_INFO, ("Monitoring LiPo voltage on gpio=%d", WIDGET_BATTERY_ADC_PIN));
mgos_adc_enable(WIDGET_BATTERY_ADC_PIN);
if (!metrics_registered)
mgos_prometheus_metrics_add_handler(prometheus_battery_metrics_fn, NULL);
metrics_registered=true;
break;
case EV_WIDGET_DRAW:
case EV_WIDGET_REDRAW: