1 /*
2 * Copyright (c) 2019 Manivannan Sadhasivam
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #include <zephyr/device.h>
8 #include <zephyr/drivers/lora.h>
9 #include <errno.h>
10 #include <zephyr/sys/util.h>
11 #include <zephyr/kernel.h>
12
13 #define DEFAULT_RADIO_NODE DT_ALIAS(lora0)
14 BUILD_ASSERT(DT_NODE_HAS_STATUS_OKAY(DEFAULT_RADIO_NODE),
15 "No default LoRa radio specified in DT");
16
17 #define MAX_DATA_LEN 255
18
19 #define LOG_LEVEL CONFIG_LOG_DEFAULT_LEVEL
20 #include <zephyr/logging/log.h>
21 LOG_MODULE_REGISTER(lora_receive);
22
lora_receive_cb(const struct device * dev,uint8_t * data,uint16_t size,int16_t rssi,int8_t snr,void * user_data)23 void lora_receive_cb(const struct device *dev, uint8_t *data, uint16_t size,
24 int16_t rssi, int8_t snr, void *user_data)
25 {
26 static int cnt;
27
28 ARG_UNUSED(dev);
29 ARG_UNUSED(size);
30 ARG_UNUSED(user_data);
31
32 LOG_INF("LoRa RX RSSI: %d dBm, SNR: %d dB", rssi, snr);
33 LOG_HEXDUMP_INF(data, size, "LoRa RX payload");
34
35 /* Stop receiving after 10 packets */
36 if (++cnt == 10) {
37 LOG_INF("Stopping packet receptions");
38 lora_recv_async(dev, NULL, NULL);
39 }
40 }
41
main(void)42 int main(void)
43 {
44 const struct device *const lora_dev = DEVICE_DT_GET(DEFAULT_RADIO_NODE);
45 struct lora_modem_config config;
46 int ret, len;
47 uint8_t data[MAX_DATA_LEN] = {0};
48 int16_t rssi;
49 int8_t snr;
50
51 if (!device_is_ready(lora_dev)) {
52 LOG_ERR("%s Device not ready", lora_dev->name);
53 return 0;
54 }
55
56 config.frequency = 865100000;
57 config.bandwidth = BW_125_KHZ;
58 config.datarate = SF_10;
59 config.preamble_len = 8;
60 config.coding_rate = CR_4_5;
61 config.iq_inverted = false;
62 config.public_network = false;
63 config.tx_power = 14;
64 config.tx = false;
65
66 ret = lora_config(lora_dev, &config);
67 if (ret < 0) {
68 LOG_ERR("LoRa config failed");
69 return 0;
70 }
71
72 /* Receive 4 packets synchronously */
73 LOG_INF("Synchronous reception");
74 for (int i = 0; i < 4; i++) {
75 /* Block until data arrives */
76 len = lora_recv(lora_dev, data, MAX_DATA_LEN, K_FOREVER,
77 &rssi, &snr);
78 if (len < 0) {
79 LOG_ERR("LoRa receive failed");
80 return 0;
81 }
82
83 LOG_INF("LoRa RX RSSI: %d dBm, SNR: %d dB", rssi, snr);
84 LOG_HEXDUMP_INF(data, len, "LoRa RX payload");
85 }
86
87 /* Enable asynchronous reception */
88 LOG_INF("Asynchronous reception");
89 lora_recv_async(lora_dev, lora_receive_cb, NULL);
90 k_sleep(K_FOREVER);
91 return 0;
92 }
93
