samples: drivers: Add LoRa receiver sample

Add sample application for receiving data packets over LoRa.

Signed-off-by: Manivannan Sadhasivam <[email protected]>

samples/drivers/lora/receive/CMakeLists.txt

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+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.13.1)
+
+include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
+project(lora_receive)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

samples/drivers/lora/receive/boards/96b_wistrio.conf

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+CONFIG_SPI_1=y

samples/drivers/lora/receive/prj.conf

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+CONFIG_LOG=y
+CONFIG_SPI=y
+CONFIG_GPIO=y
+CONFIG_LORA=y
+CONFIG_LORA_SX1276=y
+CONFIG_PRINTK=y
+CONFIG_COUNTER=y

samples/drivers/lora/receive/sample.yaml

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+common:
+   tags: lora
+sample:
+   description: Demonstration of LoRa Receive functionality
+   name: LoRa Receive Sample
+tests:
+   sample.driver.lora.receive:
+     platform_whitelist: 96b_wistrio

samples/drivers/lora/receive/src/main.c

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+/*
+ * Copyright (c) 2019 Manivannan Sadhasivam
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <device.h>
+#include <drivers/lora.h>
+#include <errno.h>
+#include <sys/util.h>
+#include <zephyr.h>
+
+#define MAX_DATA_LEN 255
+
+#define LOG_LEVEL CONFIG_LOG_DEFAULT_LEVEL
+#include <logging/log.h>
+LOG_MODULE_REGISTER(lora_receive);
+
+void main(void)
+{
+	struct device *lora_dev;
+	struct lora_modem_config config;
+	int ret, len;
+	u8_t data[MAX_DATA_LEN] = {0};
+
+	lora_dev = device_get_binding(DT_INST_0_SEMTECH_SX1276_LABEL);
+	if (!lora_dev) {
+		LOG_ERR("%s Device not found", DT_INST_0_SEMTECH_SX1276_LABEL);
+		return;
+	}
+
+	config.frequency = 865100000;
+	config.bandwidth = BW_125_KHZ;
+	config.datarate = SF_10;
+	config.preamble_len = 8;
+	config.coding_rate = CR_4_5;
+	config.tx_power = 14;
+	config.tx = false;
+
+	ret = lora_config(lora_dev, &config);
+	if (ret < 0) {
+		LOG_ERR("LoRa config failed");
+		return;
+	}
+
+	while (1) {
+		/* Block until data arrives */
+		len = lora_recv(lora_dev, data, MAX_DATA_LEN, K_FOREVER);
+		if (len < 0) {
+			LOG_ERR("LoRa receive failed");
+			return;
+		}
+
+		LOG_INF("Received data: %s", log_strdup(data));
+	}
+}