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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
};/**
* @brief RMT TX channel specific configuration
*/
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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;