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    rmt_tx_channel_config_t tx_chan_config = {
        .clk_src = RMT_CLK_SRC_DEFAULT, // select clock source
        .gpio_num = STEP_MOTOR_GPIO_STEP,
        .mem_block_symbols = 64,
        .resolution_hz = STEP_MOTOR_RESOLUTION_HZ,
        .trans_queue_depth = 10, // set the number of transactions that can be pending in the background
    };

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typedef struct {
    gpio_num_t gpio_num;        /*!< GPIO number used by RMT TX channel. Set to -1 if unused */
    rmt_clock_source_t clk_src; /*!< Clock source of RMT TX channel, channels in the same group must use the same clock source */
    uint32_t resolution_hz;     /*!< Channel clock resolution, in Hz */
    size_t mem_block_symbols;   /*!< Size of memory block, in number of `rmt_symbol_word_t`, must be an even.
                                     In the DMA mode, this field controls the DMA buffer size, it can be set to a large value;
                                     In the normal mode, this field controls the number of RMT memory block that will be used by the channel. */
    size_t trans_queue_depth;   /*!< Depth of internal transfer queue, increase this value can support more transfers pending in the background */
    int intr_priority;          /*!< RMT interrupt priority,
                                     if set to 0, the driver will try to allocate an interrupt with a relative low priority (1,2,3) */
    struct {
        uint32_t invert_out: 1;   /*!< Whether to invert the RMT channel signal before output to GPIO pad */
        uint32_t with_dma: 1;     /*!< If set, the driver will allocate an RMT channel with DMA capability */
        uint32_t io_loop_back: 1; /*!< The signal output from the GPIO will be fed to the input path as well */
        uint32_t io_od_mode: 1;   /*!< Configure the GPIO as open-drain mode */
    } flags;                      /*!< TX channel config flags */
} rmt_tx_channel_config_t;