sx126x_init()函数具体内容

以下是Semtech公司sx126x芯片驱动库中sx126x_init()函数的具体内容：

void sx126x_init( sx126x_t* sx126x )
{
    // 初始化SPI接口
    spi_bus_config_t bus_config = {
        .miso_io_num = -1,
        .mosi_io_num = sx126x->spi.mosi_io_num,
        .sclk_io_num = sx126x->spi.sclk_io_num,
        .quadwp_io_num = -1,
        .quadhd_io_num = -1,
        .max_transfer_sz = 0,
    };
    spi_device_interface_config_t dev_config = {
        .clock_speed_hz = sx126x->spi_clock_speed_hz,
        .mode = sx126x->spi_mode,
        .spics_io_num = sx126x->pin_nss,
        .queue_size = 1,
        .pre_cb = NULL,
        .post_cb = NULL,
        .flags = 0,
        .cs_ena_posttrans = 0,
        .cs_ena_pretrans = 0,
        .input_delay_ns = 0,
        .command_bits = 0,
        .address_bits = 0,
        .dummy_bits = 0,
    };
    spi_bus_initialize( VSPI_HOST, &bus_config, 1 );
    spi_device_handle_t spi;
    spi_bus_add_device( VSPI_HOST, &dev_config, &spi );

    // 初始化GPIO引脚
    gpio_pad_select_gpio( sx126x->pin_nss );
    gpio_set_direction( sx126x->pin_nss, GPIO_MODE_OUTPUT );
    gpio_set_level( sx126x->pin_nss, 1 );
    gpio_pad_select_gpio( sx126x->pin_busy );
    gpio_set_direction( sx126x->pin_busy, GPIO_MODE_INPUT );
    gpio_pad_select_gpio( sx126x->pin_dio1 );
    gpio_set_direction( sx126x->pin_dio1, GPIO_MODE_INPUT );
    gpio_pad_select_gpio( sx126x->pin_reset );
    gpio_set_direction( sx126x->pin_reset, GPIO_MODE_OUTPUT );
    gpio_set_level( sx126x->pin_reset, 1 );

    // 复位芯片
    sx126x_reset( sx126x );
}

该函数首先根据传入的sx126x_t结构体中的SPI接口、NSS引脚、SPI时钟频率、SPI模式等信息，初始化了ESP32的SPI接口，并通过spi_bus_add_device()函数获取了SPI设备句柄。随后，该函数还初始化了sx126x芯片的GPIO引脚，并将NSS引脚置高。最后，该函数调用了sx126x_reset()函数，将sx126x芯片复位。

需要注意的是，使用sx126x芯片驱动库的函数前，需要先通过sx126x_init()函数初始化sx126x芯片的SPI接口、GPIO引脚等信息。