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add GPS to heltecv3

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liquidraver
2026-07-16 13:02:00 +02:00
parent c571bae013
commit 28e2126dcc
2 changed files with 59 additions and 0 deletions
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zephcore/boards/esp32/heltec_wifi_lora32_v3/board.conf
+1
View File
@@ -4,6 +4,7 @@
# ESP32-S3 (8MB flash, no PSRAM)
# SX1262 on SPI2 (direct output, no PA)
# SSD1306 128x64 OLED on I2C0
# Optional external GPS on UART1 (RX=GPIO47, TX=GPIO48, enable GPIO26)
# User button on GPIO0
#
# Include order: prj.conf → zephcore_common.conf → esp32_common.conf → board.conf
zephcore/boards/esp32/heltec_wifi_lora32_v3/board.overlay
+58
View File
@@ -13,10 +13,15 @@
* Vext: GPIO36 (active-LOW, powers OLED) — regulator + vin-supply in overlay
* Button: GPIO0
* LED: GPIO35
* GPS UART1: TX=GPIO48, RX=GPIO47, 9600 baud (optional external module)
* GPS enable: GPIO26 (active-HIGH)
*/
#include <zephyr/dt-bindings/input/input-event-codes.h>
#include <zephyr/dt-bindings/adc/adc.h>
#include <zephyr/dt-bindings/pinctrl/esp-pinctrl-common.h>
#include <zephyr/dt-bindings/pinctrl/esp32s3-pinctrl.h>
#include <zephyr/dt-bindings/pinctrl/esp32s3-gpio-sigmap.h>
/ {
chosen {
@@ -77,6 +82,26 @@
regulator-always-on;
};
/* GPS enable — GPIO26, active-HIGH (Arduino MeshCore PIN_GPS_EN=26; its
* PIN_GPS_EN_ACTIVE defaults to HIGH and this variant does not override it).
* ZephCore's simple-board GPS manager drives this via the gps-enable alias.
*
* GPIO26 is SPICS1 on the ESP32-S3 — a flash/PSRAM-range pad. It is free
* here because the V3 carries an ESP32-S3FN8 (in-package flash, no PSRAM),
* so nothing claims the PSRAM chip select. Do not reuse this pin on a V3
* respin that adds PSRAM. */
gps_en: gps-enable {
compatible = "gpio-leds";
gps_enable_pin: gps_enable {
gpios = <&gpio0 26 GPIO_ACTIVE_HIGH>;
label = "GPS Enable";
};
};
aliases {
gps-enable = &gps_enable_pin;
};
/* Button chain — same mapping as RAK4631 / WisMesh Pocket (rak4631/board.overlay). */
user_btn_longpress {
compatible = "zephyr,input-longpress";
@@ -107,6 +132,39 @@
rx-boosted;
};
/* GPS on UART1 — optional external NMEA module on the pin header, wired to the
* same pins Arduino MeshCore uses for this board (PIN_GPS_RX=47, PIN_GPS_TX=48).
* Upstream leaves uart1 disabled and gives it no pinctrl, so both are set here.
* GPIO47/48 are otherwise unclaimed on the V3; the console stays on uart0
* (GPIO43/44). 9600 baud matches Arduino's default for this variant.
*
* The node is unconditional, like the RAK4631's gnss node for the optional
* RAK1910: with no module fitted the driver simply never sees a fix. */
&pinctrl {
uart1_default: uart1_default {
group1 {
pinmux = <UART1_TX_GPIO48>;
output-high;
};
group2 {
pinmux = <UART1_RX_GPIO47>;
bias-pull-up;
};
};
};
&uart1 {
status = "okay";
current-speed = <9600>;
pinctrl-0 = <&uart1_default>;
pinctrl-names = "default";
gnss: gnss-nmea-generic {
compatible = "gnss-nmea-generic";
};
};
/* Reduce CPU clock from 240 MHz to 160 MHz — saves power, HAL minimum */
&cpu0 {
clock-frequency = <DT_FREQ_M(160)>;