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Allow deepsleep in rak4630 and make it restart well when power comes back (#7882)

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* Make RAK4631 nodes power back on deep sleep

The devices will hang if the VBAT goes under 1.7V (Brown-out reset) and
they will never come back unless power supply goes completely off.

This kills unattended nodes.

Using the SystemOff the LPCOMP we can get the nodes back again when
power comes back, even if VBAT goes under 1.7V, which moreover is more
unlikely because the device is off.

* Adding support for heltec t114

And moved particularities to variant.h

* Remove old cpp comment that belongs to variant.h

It was a leftover.

* Trunk fix

---------

Co-authored-by: Tom Fifield <tom@tomfifield.net>
This commit is contained in:
viric
2025-11-18 18:23:39 +01:00
committed by GitHub
parent 6c09cf9d3d
commit d18f3f7a65
5 changed files with 52 additions and 11 deletions
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10
variants/nrf52840/heltec_mesh_node_t114/variant.h
View File

@@ -210,6 +210,16 @@ No longer populated on PCB
#define VBAT_AR_INTERNAL AR_INTERNAL_3_0
#define ADC_MULTIPLIER (4.916F)
// rf52840 AIN2 = Pin 4
#define BATTERY_LPCOMP_INPUT NRF_LPCOMP_INPUT_2
// We have AIN2 with a VBAT divider so AIN2 = VBAT * (100/490)
// We have the device going deep sleep under 3.1V, which is AIN2 = 0.63V
// So we can wake up when VBAT>=VDD is restored to 3.3V, where AIN2 = 0.67V
// Ratio 0.67/3.3 = 0.20, so we can pick a bit higher, 2/8 VDD, which means
// VBAT=4.04V
#define BATTERY_LPCOMP_THRESHOLD NRF_LPCOMP_REF_SUPPLY_2_8
#define HAS_RTC 0
#ifdef __cplusplus
}

14
variants/nrf52840/rak4631/variant.h
View File

@@ -267,6 +267,20 @@ SO GPIO 39/TXEN MAY NOT BE DEFINED FOR SUCCESSFUL OPERATION OF THE SX1262 - TG
#define VBAT_AR_INTERNAL AR_INTERNAL_3_0
#define ADC_MULTIPLIER 1.73
// RAK4630 AIN0 = nrf52840 AIN3 = Pin 5
#define BATTERY_LPCOMP_INPUT NRF_LPCOMP_INPUT_3
// We have AIN3 with a VBAT divider so AIN3 = VBAT * (1.5/2.5)
// We have the device going deep sleep under 3.1V, which is AIN3 = 1.86V
// So we can wake up when VBAT>=VDD is restored to 3.3V, where AIN3 = 1.98V
// 1.98/3.3 = 6/10, but that's close to the VBAT divider, so we
// pick 6/8VDD, which means VBAT=4.1V.
// Reference:
// VDD=3.3V AIN3=5/8*VDD=2.06V VBAT=1.66*AIN3=3.41V
// VDD=3.3V AIN3=11/16*VDD=2.26V VBAT=1.66*AIN3=3.76V
// VDD=3.3V AIN3=6/8*VDD=2.47V VBAT=1.66*AIN3=4.1V
#define BATTERY_LPCOMP_THRESHOLD NRF_LPCOMP_REF_SUPPLY_11_16
#define HAS_RTC 1
#define HAS_ETHERNET 1