Espressif ESP32-S2 - Page 358

Chapter 2. API Reference
Parameters
• channel: RMT channel
• loop_en: Pointer to accept RMT transmitter loop sending mode.
esp_err_t rmt_set_rx_filter(rmt_channel_t channel, bool rx_filter_en, uint8_t thresh)
Set RMT RX filter.
In receive mode, channel will ignore input pulse when the pulse width is smaller than threshold. Counted in
source clock, not divided counter clock.
Return
• ESP_ERR_INVALID_ARG Parameter error
• ESP_OK Success
Parameters
• channel: RMT channel
• rx_filter_en: To enable RMT receiver filter.
• thresh: Threshold of pulse width for receiver.
esp_err_t rmt_set_source_clk(rmt_channel_t channel, rmt_source_clk_t base_clk)
Set RMT source clock.
RMT module has two clock sources:
1. APB clock which is 80Mhz
2. REF tick clock, which would be 1Mhz (not supported in this version).
Return
• ESP_ERR_INVALID_ARG Parameter error
• ESP_OK Success
Parameters
• channel: RMT channel
• base_clk: To choose source clock for RMT module.
esp_err_t rmt_get_source_clk(rmt_channel_t channel, rmt_source_clk_t *src_clk)
Get RMT source clock.
RMT module has two clock sources:
1. APB clock which is 80Mhz
2. REF tick clock, which would be 1Mhz (not supported in this version).
Return
• ESP_ERR_INVALID_ARG Parameter error
• ESP_OK Success
Parameters
• channel: RMT channel
• src_clk: Pointer to accept source clock for RMT module.
esp_err_t rmt_set_idle_level(rmt_channel_t channel, bool idle_out_en, rmt_idle_level_t level)
Set RMT idle output level for transmitter.
Return
• ESP_ERR_INVALID_ARG Parameter error
• ESP_OK Success
Parameters
• channel: RMT channel
• idle_out_en: To enable idle level output.
• level: To set the output signal’s level for channel in idle state.
esp_err_t rmt_get_idle_level(rmt_channel_t channel, bool *idle_out_en, rmt_idle_level_t *level)
Get RMT idle output level for transmitter.
Return
• ESP_ERR_INVALID_ARG Parameter error
• ESP_OK Success
Parameters
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