esp32-idf lora休眠唤醒代码

以下是ESP32-IDF中使用LoRa进行休眠和唤醒的示例代码：

#include "esp_sleep.h"
#include "driver/gpio.h"
#include "esp_log.h"
#include "driver/spi_master.h"
#include "sx1276.h"

#define SPI_MISO_PIN GPIO_NUM_19
#define SPI_MOSI_PIN GPIO_NUM_27
#define SPI_SCLK_PIN GPIO_NUM_5
#define SPI_CS_PIN GPIO_NUM_18

#define LORA_RESET_PIN GPIO_NUM_14
#define LORA_DIO0_PIN GPIO_NUM_26
#define LORA_DIO1_PIN GPIO_NUM_33
#define LORA_DIO2_PIN GPIO_NUM_32

#define LORA_BANDWIDTH 0
#define LORA_SPREADING_FACTOR 7
#define LORA_CODING_RATE 1
#define LORA_SYNC_WORD 0x12

static const char *TAG = "lora_sleep_wakeup";

spi_device_handle_t spi;

void lora_sleep()
{
    ESP_LOGI(TAG, "Entering LoRa sleep mode...");
    sx1276_set_standby(spi);
    esp_sleep_enable_ext0_wakeup(LORA_DIO0_PIN, 0);
    esp_sleep_enable_ext1_wakeup(1ULL << LORA_RESET_PIN, ESP_EXT1_WAKEUP_ANY_HIGH);
    esp_deep_sleep_start();
}

void lora_wakeup()
{
    ESP_LOGI(TAG, "Waking up from LoRa sleep mode...");
    gpio_set_direction(LORA_RESET_PIN, GPIO_MODE_OUTPUT);
    gpio_set_level(LORA_RESET_PIN, 0);
    vTaskDelay(pdMS_TO_TICKS(1));
    gpio_set_level(LORA_RESET_PIN, 1);
    vTaskDelay(pdMS_TO_TICKS(10));
    sx1276_init(spi, LORA_BANDWIDTH, LORA_SPREADING_FACTOR, LORA_CODING_RATE, LORA_SYNC_WORD, LORA_DIO0_PIN, LORA_DIO1_PIN, LORA_DIO2_PIN);
}

void app_main()
{
    spi_bus_config_t spi_bus_cfg = {
        .mosi_io_num = SPI_MOSI_PIN,
        .miso_io_num = SPI_MISO_PIN,
        .sclk_io_num = SPI_SCLK_PIN,
        .quadwp_io_num = -1,
        .quadhd_io_num = -1,
        .max_transfer_sz = 0,
    };

    spi_device_interface_config_t spi_dev_cfg = {
        .clock_speed_hz = 10000000,
        .mode = 0,
        .spics_io_num = SPI_CS_PIN,
        .queue_size = 1,
    };

    esp_err_t ret = spi_bus_initialize(HSPI_HOST, &spi_bus_cfg, 1);
    assert(ret == ESP_OK);
    ret = spi_bus_add_device(HSPI_HOST, &spi_dev_cfg, &spi);
    assert(ret == ESP_OK);

    sx1276_init(spi, LORA_BANDWIDTH, LORA_SPREADING_FACTOR, LORA_CODING_RATE, LORA_SYNC_WORD, LORA_DIO0_PIN, LORA_DIO1_PIN, LORA_DIO2_PIN);

    while (1) {
        ESP_LOGI(TAG, "Sending LoRa packet...");
        sx1276_send_packet(spi, "Hello, LoRa!", strlen("Hello, LoRa!"));
        lora_sleep();
        lora_wakeup();
    }
}

在这个示例代码中，我们使用ESP32的Deep Sleep功能和外部中断来实现LoRa的休眠和唤醒。在进入休眠模式之前，我们通过调用`sx1276_set_standby`函数将LoRa芯片设置为待机模式，并使用`esp_sleep_enable_ext0_wakeup`和`esp_sleep_enable_ext1_wakeup`函数来启用外部中断唤醒。在唤醒时，我们首先将LoRa芯片复位，然后重新初始化它。

同时，需要注意的是，在进入Deep Sleep模式之前，我们还需要将LoRa芯片从SPI总线上断开，以避免在Deep Sleep期间消耗电力。在唤醒时，我们需要重新连接LoRa芯片到SPI总线上，并重新初始化它。