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: Gaël PORTAY <[email protected]>
Shengliang · Oct 31, 2022 · cd9d2db · cd9d2db
1 parent ac76c27
commit cd9d2db
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diff --git a/boards/xtensa/heltec_wifi_lora32_v2/heltec_wifi_lora32_v2-pinctrl.dtsi b/boards/xtensa/heltec_wifi_lora32_v2/heltec_wifi_lora32_v2-pinctrl.dtsi
@@ -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>,

diff --git a/boards/xtensa/heltec_wifi_lora32_v2/heltec_wifi_lora32_v2.dts b/boards/xtensa/heltec_wifi_lora32_v2/heltec_wifi_lora32_v2.dts
@@ -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 {