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xiao nrf 100mA charging

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liquidraver
2026-08-16 11:47:29 +02:00
parent 533193aa30
commit 6705ff4507
2 changed files with 54 additions and 2 deletions
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zephcore/boards/nrf52840/ikoka_nano_30dbm/ikoka_nano_30dbm.dts
+25 -2
View File
@@ -15,6 +15,7 @@
* - D3 = P0.29 (RESET) - D7 = P1.12 (RXEN)
*
* Battery: P0.31/AIN7 with enable on P0.14
* Charge current: HICHG P0.13, LOW = 100mA, floating/HIGH = 50mA (BQ25100)
* LEDs: RED=P0.26/D11, BLUE=P0.06/D12, GREEN=P0.30/D13
*/
@@ -61,12 +62,21 @@
};
};
/* Battery ADC enable - P0.14 must be LOW to read battery */
/*
* Battery ADC enable - P0.14 must be LOW to read battery, and is held
* LOW permanently: driving it HIGH lifts the AIN7 node to ~3.6V at a
* 4.2V cell, the nRF52840 GPIO absolute maximum. See the same node in
* boards/nrf52840/xiao_nrf52840 for the full reasoning.
*
* always-on rather than boot-on: boot-on holds the pin only as long as
* every regulator_enable() is matched by exactly one disable(), leaving
* the refcount at 1. always-on removes that dependency.
*/
vbat_enable: vbat-enable {
compatible = "regulator-fixed";
regulator-name = "vbat-enable";
enable-gpios = <&gpio0 14 GPIO_ACTIVE_LOW>;
regulator-boot-on;
regulator-always-on;
};
/* Battery ADC channel */
@@ -109,6 +119,19 @@
&gpio0 {
status = "okay";
/* HICHG — BQ25100 charge-current select on the XIAO module. Physically
* LOW selects 100mA; left floating (reset default) the charger stays at
* 50mA. Matches MeshCore variants/ikoka_nano_nrf initVariant(). Note the
* sibling ikoka_handheld_nrf variant deliberately drives this pin the
* other way because it charges through an external TP4056 — any carrier
* board with its own charger must delete this hog. */
hichg {
gpio-hog;
gpios = <13 GPIO_ACTIVE_LOW>;
output-high;
line-name = "hichg";
};
};
&gpio1 {
zephcore/boards/nrf52840/xiao_nrf52840/xiao_nrf52840_nrf52840.dts
+29
View File
@@ -8,6 +8,7 @@
* - LEDs: red P0.26 (D11, MeshCore P_LORA_TX_LED), blue P0.06 (D12), green P0.30 (D13), active-low
* - User button: D0 = P0.02
* - Battery: AIN7 P0.31, divider enable P0.14 (D14), active-low enable
* - Charge current: HICHG P0.13, LOW = 100mA, floating/HIGH = 50mA (BQ25100)
* - I2C: P1.12 SDA / P1.11 SCL (MeshCore Wire on D7/D6 when LoRa uses D4/D5)
* - UART0 not used (pins shared with I2C in this layout)
*/
@@ -81,10 +82,26 @@
tap-delay-ms = <400>;
};
/*
* Battery ADC divider enable, P0.14 (~2.96:1, ~1.5M total).
*
* Held LOW permanently rather than toggled per read. The divider's
* bottom leg lands on this pin, so driving it HIGH lifts the AIN7 node
* to VBAT_low + (VBAT - VDD)/2.96 ~ 3.6V at a 4.2V cell — exactly the
* nRF52840 GPIO absolute maximum (VDD + 0.3V), with no margin and over
* it on a hotter pack. Letting it float is worse (node sits at VBAT).
* LOW puts the node at ~1.4V and costs ~2.8uA of divider current, which
* is noise next to BLE + LoRa RX. Matches MeshCore variants/xiao_nrf52.
*
* always-on, not boot-on: boot-on only survives because ZephyrBoard's
* enable/disable calls are balanced and leave the refcount at 1. Any
* unbalanced disable would drop it to 0 and drive the pin HIGH again.
*/
vbat_enable: vbat-enable {
compatible = "regulator-fixed";
regulator-name = "vbat-enable";
enable-gpios = <&gpio0 14 GPIO_ACTIVE_LOW>;
regulator-always-on;
};
zephyr,user {
@@ -136,6 +153,18 @@
&gpio0 {
status = "okay";
/* HICHG — BQ25100 charge-current select. Physically LOW selects 100mA;
* left floating (reset default) the charger stays at 50mA. Matches
* MeshCore variants/xiao_nrf52 initVariant(). Boards that charge the
* pack through an external charger (e.g. a TP4056 carrier) must delete
* this hog or drive it inactive — do not run two chargers at once. */
hichg {
gpio-hog;
gpios = <13 GPIO_ACTIVE_LOW>;
output-high;
line-name = "hichg";
};
};
&gpio1 {