Commit cd9d2db8 authored by Gaël PORTAY's avatar Gaël PORTAY Committed by Carles Cufi
Browse files

boards: heltec_wifi_lora32_v2: enable lora 

This enables the support for the Semtech SX1276 chip on board (see the
pinout[1] and schematic[2] documents).

The chip is connected to SPI as follow:

| PIN  | GPIO   |
| ---- | -------|
| CS#  | GPIO18 |
| CLK  | GPIO5  |
| MOSI | GPIO27 |
| MISO | GPIO19 |
| RST# | GPIO14 |

Additionally, the LoRa DIO PINs are connected as follow:

| PIN  | GPIO   |
| ---- | -------|
| DIO0 | GPIO26 |
| DIO1 | GPIO35 |
| DIO2 | GPIO34 |

_Note_: The first three DIO PINs are connected to the ESP32 MCU only.

[1]: https://resource.heltec.cn/download/WiFi_LoRa_32/WIFI_LoRa_32_V2.1.pdf
[2]: https://resource.heltec.cn/download/WiFi_LoRa_32/V2/WIFI_LoRa_32_V2(868-915).PDF



Signed-off-by: default avatarGaël PORTAY <gael.portay@gmail.com>
parent ac76c27a

boards/xtensa/heltec_wifi_lora32_v2/heltec_wifi_lora32_v2-pinctrl.dtsi

+11 −0
Original line number Diff line number Diff line
@@ -20,6 +20,17 @@ 
		};

	};



	spim3_default: spim3_default {

		group1 {

			pinmux = <SPIM3_MISO_GPIO19>,

				 <SPIM3_SCLK_GPIO5>;

		};

		group2 {

			pinmux = <SPIM3_MOSI_GPIO27>;

			output-low;

		};

	};



	i2c0_default: i2c0_default {

		group1 {

			pinmux = <I2C0_SDA_GPIO4>,

boards/xtensa/heltec_wifi_lora32_v2/heltec_wifi_lora32_v2.dts

+24 −1
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 
		led0 = &led0;

		sw0 = &button0;

		watchdog0 = &wdt0;

		lora0 = &lora0;

	};



	leds {
@@ -56,7 +57,6 @@ 
	};

};





&cpu0 {

	clock-frequency = <ESP32_CLK_CPU_240M>;

};
@@ -89,6 +89,29 @@ 
	pinctrl-names = "default";

};



&spi3 {

	#address-cells = <1>;

	#size-cells = <0>;

	status = "okay";

	pinctrl-0 = <&spim3_default>;

	pinctrl-names = "default";

	cs-gpios = <&gpio0 18 GPIO_ACTIVE_LOW>;

	lora0: lora@0 {

		compatible = "semtech,sx1276";

		reg = <0>;

		reset-gpios = <&gpio0 14 GPIO_ACTIVE_LOW>;

		dio-gpios =

			/* SX1276 D0 -> GPIO26 */

			<&gpio0 26 (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>,

			/* SX1276 D1 -> GPIO35 */

			<&gpio1 3 (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>,

			/* SX1276 D1 -> GPIO34 */

			<&gpio1 2 (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>;

		spi-max-frequency = <1000000>;

		power-amplifier-output = "pa-boost";

	};

};



&flash0 {

	status = "okay";

	partitions {

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