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

/*
 * 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 DEFAULT_RADIO_NODE DT_ALIAS(lora0)
BUILD_ASSERT(DT_NODE_HAS_STATUS(DEFAULT_RADIO_NODE, okay),
	     "No default LoRa radio specified in DT");

#define MAX_DATA_LEN 255

#define LOG_LEVEL CONFIG_LOG_DEFAULT_LEVEL
#include <logging/log.h>
LOG_MODULE_REGISTER(lora_receive);

void lora_receive_cb(const struct device *dev, uint8_t *data, uint16_t size,
		     int16_t rssi, int8_t snr)
{
	static int cnt;

	ARG_UNUSED(dev);
	ARG_UNUSED(size);

	LOG_INF("Received data: %s (RSSI:%ddBm, SNR:%ddBm)",
		log_strdup(data), rssi, snr);

	/* Stop receiving after 10 packets */
	if (++cnt == 10) {
		LOG_INF("Stopping packet receptions");
		lora_recv_async(dev, NULL);
	}
}

void main(void)
{
	const struct device *lora_dev = DEVICE_DT_GET(DEFAULT_RADIO_NODE);
	struct lora_modem_config config;
	int ret, len;
	uint8_t data[MAX_DATA_LEN] = {0};
	int16_t rssi;
	int8_t snr;

	if (!device_is_ready(lora_dev)) {
		LOG_ERR("%s Device not ready", lora_dev->name);
		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;
	}

	/* Receive 4 packets synchronously */
	LOG_INF("Synchronous reception");
	for (int i = 0; i < 4; i++) {
		/* Block until data arrives */
		len = lora_recv(lora_dev, data, MAX_DATA_LEN, K_FOREVER,
				&rssi, &snr);
		if (len < 0) {
			LOG_ERR("LoRa receive failed");
			return;
		}

		LOG_INF("Received data: %s (RSSI:%ddBm, SNR:%ddBm)",
			log_strdup(data), rssi, snr);
	}

	/* Enable asynchronous reception */
	LOG_INF("Asynchronous reception");
	lora_recv_async(lora_dev, lora_receive_cb);
	k_sleep(K_FOREVER);
}