741 lines
21 KiB
C
741 lines
21 KiB
C
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef _DRIVER_RMT_CTRL_H_
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#define _DRIVER_RMT_CTRL_H_
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#include "esp_err.h"
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#include "soc/rmt_reg.h"
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#include "soc/dport_reg.h"
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#include "soc/rmt_struct.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/semphr.h"
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#include "freertos/xtensa_api.h"
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#include "freertos/ringbuf.h"
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#include "driver/gpio.h"
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#include "driver/periph_ctrl.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define RMT_MEM_BLOCK_BYTE_NUM (256)
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#define RMT_MEM_ITEM_NUM (RMT_MEM_BLOCK_BYTE_NUM/4)
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typedef enum {
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RMT_CHANNEL_0 = 0, /*!< RMT Channel 0 */
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RMT_CHANNEL_1, /*!< RMT Channel 1 */
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RMT_CHANNEL_2, /*!< RMT Channel 2 */
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RMT_CHANNEL_3, /*!< RMT Channel 3 */
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RMT_CHANNEL_4, /*!< RMT Channel 4 */
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RMT_CHANNEL_5, /*!< RMT Channel 5 */
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RMT_CHANNEL_6, /*!< RMT Channel 6 */
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RMT_CHANNEL_7, /*!< RMT Channel 7 */
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RMT_CHANNEL_MAX
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} rmt_channel_t;
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typedef enum {
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RMT_MEM_OWNER_TX = 0, /*!< RMT RX mode, RMT transmitter owns the memory block*/
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RMT_MEM_OWNER_RX = 1, /*!< RMT RX mode, RMT receiver owns the memory block*/
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RMT_MEM_OWNER_MAX,
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}rmt_mem_owner_t;
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typedef enum {
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RMT_BASECLK_REF = 0, /*!< RMT source clock system reference tick, 1MHz by default (not supported in this version) */
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RMT_BASECLK_APB, /*!< RMT source clock is APB CLK, 80Mhz by default */
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RMT_BASECLK_MAX,
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} rmt_source_clk_t;
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typedef enum {
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RMT_DATA_MODE_FIFO = 0, /*<! RMT memory access in FIFO mode */
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RMT_DATA_MODE_MEM = 1, /*<! RMT memory access in memory mode */
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RMT_DATA_MODE_MAX,
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} rmt_data_mode_t;
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typedef enum {
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RMT_MODE_TX = 0, /*!< RMT TX mode */
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RMT_MODE_RX, /*!< RMT RX mode */
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RMT_MODE_MAX
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} rmt_mode_t;
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typedef enum {
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RMT_IDLE_LEVEL_LOW = 0, /*!< RMT TX idle level: low Level */
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RMT_IDLE_LEVEL_HIGH, /*!< RMT TX idle level: high Level */
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RMT_IDLE_LEVEL_MAX,
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} rmt_idle_level_t;
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typedef enum {
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RMT_CARRIER_LEVEL_LOW = 0, /*!< RMT carrier wave is modulated for low Level output */
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RMT_CARRIER_LEVEL_HIGH, /*!< RMT carrier wave is modulated for high Level output */
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RMT_CARRIER_LEVEL_MAX
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} rmt_carrier_level_t;
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/**
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* @brief Data struct of RMT TX configure parameters
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*/
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typedef struct {
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bool loop_en; /*!< Enable sending RMT items in a loop */
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uint32_t carrier_freq_hz; /*!< RMT carrier frequency */
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uint8_t carrier_duty_percent; /*!< RMT carrier duty (%) */
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rmt_carrier_level_t carrier_level; /*!< Level of the RMT output, when the carrier is applied */
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bool carrier_en; /*!< RMT carrier enable */
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rmt_idle_level_t idle_level; /*!< RMT idle level */
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bool idle_output_en; /*!< RMT idle level output enable */
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}rmt_tx_config_t;
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/**
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* @brief Data struct of RMT RX configure parameters
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*/
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typedef struct {
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bool filter_en; /*!< RMT receiver filter enable */
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uint8_t filter_ticks_thresh; /*!< RMT filter tick number */
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uint16_t idle_threshold; /*!< RMT RX idle threshold */
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}rmt_rx_config_t;
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/**
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* @brief Data struct of RMT configure parameters
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*/
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typedef struct {
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rmt_mode_t rmt_mode; /*!< RMT mode: transmitter or receiver */
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rmt_channel_t channel; /*!< RMT channel */
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uint8_t clk_div; /*!< RMT channel counter divider */
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gpio_num_t gpio_num; /*!< RMT GPIO number */
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uint8_t mem_block_num; /*!< RMT memory block number */
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union{
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rmt_tx_config_t tx_config; /*!< RMT TX parameter */
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rmt_rx_config_t rx_config; /*!< RMT RX parameter */
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};
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} rmt_config_t;
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typedef intr_handle_t rmt_isr_handle_t;
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/**
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* @brief Set RMT clock divider, channel clock is divided from source clock.
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*
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* @param channel RMT channel (0-7)
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*
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* @param div_cnt RMT counter clock divider
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*/
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esp_err_t rmt_set_clk_div(rmt_channel_t channel, uint8_t div_cnt);
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/**
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* @brief Get RMT clock divider, channel clock is divided from source clock.
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*
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* @param channel RMT channel (0-7)
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*
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* @param div_cnt pointer to accept RMT counter divider
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*/
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esp_err_t rmt_get_clk_div(rmt_channel_t channel, uint8_t* div_cnt);
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/**
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* @brief Set RMT RX idle threshold value
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*
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* In receive mode, when no edge is detected on the input signal
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* for longer than idle_thres channel clock cycles,
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* the receive process is finished.
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*
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* @param channel RMT channel (0-7)
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*
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* @param thresh RMT RX idle threshold
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*/
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esp_err_t rmt_set_rx_idle_thresh(rmt_channel_t channel, uint16_t thresh);
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/**
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* @brief Get RMT idle threshold value.
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*
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* In receive mode, when no edge is detected on the input signal
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* for longer than idle_thres channel clock cycles,
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* the receive process is finished.
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*
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* @param channel RMT channel (0-7)
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*
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* @param thresh pointer to accept RMT RX idle threshold value
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*/
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esp_err_t rmt_get_rx_idle_thresh(rmt_channel_t channel, uint16_t *thresh);
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/**
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* @brief Set RMT memory block number for RMT channel
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*
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* This function is used to configure the amount of memory blocks allocated to channel n
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* The 8 channels share a 512x32-bit RAM block which can be read and written
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* by the processor cores over the APB bus, as well as read by the transmitters
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* and written by the receivers.
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*
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* The RAM address range for channel n is start_addr_CHn to end_addr_CHn, which are defined by:
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* Memory block start address is RMT_CHANNEL_MEM(n) (in soc/rmt_reg.h),
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* that is, start_addr_chn = RMT base address + 0x800 + 64 ∗ 4 ∗ n, and
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* end_addr_chn = RMT base address + 0x800 + 64 ∗ 4 ∗ n + 64 ∗ 4 ∗ RMT_MEM_SIZE_CHn mod 512 ∗ 4
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*
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* @note
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* If memory block number of one channel is set to a value greater than 1, this channel will occupy the memory
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* block of the next channel.
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* Channel 0 can use at most 8 blocks of memory, accordingly channel 7 can only use one memory block.
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*
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* @param channel RMT channel (0-7)
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*
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* @param rmt_mem_num RMT RX memory block number, one block has 64 * 32 bits.
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*/
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esp_err_t rmt_set_mem_block_num(rmt_channel_t channel, uint8_t rmt_mem_num);
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/**
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* @brief Get RMT memory block number
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*
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* @param channel RMT channel (0-7)
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*
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* @param rmt_mem_num Pointer to accept RMT RX memory block number
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*/
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esp_err_t rmt_get_mem_block_num(rmt_channel_t channel, uint8_t* rmt_mem_num);
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/**
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* @brief Configure RMT carrier for TX signal.
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*
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* Set different values for carrier_high and carrier_low to set different frequency of carrier.
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* The unit of carrier_high/low is the source clock tick, not the divided channel counter clock.
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*
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* @param channel RMT channel (0-7)
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*
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* @param carrier_en Whether to enable output carrier.
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*
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* @param high_level High level duration of carrier
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*
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* @param low_level Low level duration of carrier.
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*
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* @param carrier_level Configure the way carrier wave is modulated for channel 0-7.
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* - 1'b1:transmit on low output level
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* - 1'b0:transmit on high output level
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*/
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esp_err_t rmt_set_tx_carrier(rmt_channel_t channel, bool carrier_en, uint16_t high_level, uint16_t low_level, rmt_carrier_level_t carrier_level);
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/**
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* @brief Set RMT memory in low power mode.
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*
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* Reduce power consumed by memory. 1:memory is in low power state.
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*
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* @param channel RMT channel (0-7)
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*
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* @param pd_en RMT memory low power enable.
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*/
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esp_err_t rmt_set_mem_pd(rmt_channel_t channel, bool pd_en);
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/**
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* @brief Get RMT memory low power mode.
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*
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* @param channel RMT channel (0-7)
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*
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* @param pd_en Pointer to accept RMT memory low power mode.
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*/
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esp_err_t rmt_get_mem_pd(rmt_channel_t channel, bool* pd_en);
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/**
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* @brief Set RMT start sending data from memory.
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*
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* @param channel RMT channel (0-7)
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*
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* @param tx_idx_rst Set true to reset memory index for TX.
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* Otherwise, transmitter will continue sending from the last index in memory.
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*/
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esp_err_t rmt_tx_start(rmt_channel_t channel, bool tx_idx_rst);
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/**
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* @brief Set RMT stop sending.
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*
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* @param channel RMT channel (0-7)
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*/
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esp_err_t rmt_tx_stop(rmt_channel_t channel);
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/**
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* @brief Set RMT start receiving data.
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*
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* @param channel RMT channel (0-7)
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*
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* @param rx_idx_rst Set true to reset memory index for receiver.
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* Otherwise, receiver will continue receiving data to the last index in memory.
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*/
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esp_err_t rmt_rx_start(rmt_channel_t channel, bool rx_idx_rst);
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/**
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* @brief Set RMT stop receiving data.
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*
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* @param channel RMT channel (0-7)
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*/
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esp_err_t rmt_rx_stop(rmt_channel_t channel);
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/**
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* @brief Reset RMT TX/RX memory index.
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*
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* @param channel RMT channel (0-7)
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*/
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esp_err_t rmt_memory_rw_rst(rmt_channel_t channel);
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/**
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* @brief Set RMT memory owner.
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*
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* @param channel RMT channel (0-7)
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*
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* @param owner To set when the transmitter or receiver can process the memory of channel.
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*/
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esp_err_t rmt_set_memory_owner(rmt_channel_t channel, rmt_mem_owner_t owner);
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/**
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* @brief Get RMT memory owner.
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*
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* @param channel RMT channel (0-7)
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*
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* @param owner Pointer to get memory owner.
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*/
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esp_err_t rmt_get_memory_owner(rmt_channel_t channel, rmt_mem_owner_t* owner);
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/**
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* @brief Set RMT tx loop mode.
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*
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* @param channel RMT channel (0-7)
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*
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* @param loop_en Enable RMT transmitter loop sending mode.
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* If set true, transmitter will continue sending from the first data
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* to the last data in channel 0-7 over and over again in a loop.
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*/
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esp_err_t rmt_set_tx_loop_mode(rmt_channel_t channel, bool loop_en);
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/**
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* @brief Get RMT tx loop mode.
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*
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* @param channel RMT channel (0-7)
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*
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* @param loop_en Pointer to accept RMT transmitter loop sending mode.
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*/
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esp_err_t rmt_get_tx_loop_mode(rmt_channel_t channel, bool* loop_en);
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/**
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* @brief Set RMT RX filter.
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*
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* In receive mode, channel 0-7 will ignore input pulse when the pulse width is smaller than threshold.
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* Counted in source clock, not divided counter clock.
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*
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* @param channel RMT channel (0-7)
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*
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* @param rx_filter_en To enable RMT receiver filter.
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*
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* @param thresh Threshold of pulse width for receiver.
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*/
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esp_err_t rmt_set_rx_filter(rmt_channel_t channel, bool rx_filter_en, uint8_t thresh);
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/**
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* @brief Set RMT source clock
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*
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* RMT module has two clock sources:
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* 1. APB clock which is 80Mhz
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* 2. REF tick clock, which would be 1Mhz (not supported in this version).
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*
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* @param channel RMT channel (0-7)
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*
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* @param base_clk To choose source clock for RMT module.
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*/
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esp_err_t rmt_set_source_clk(rmt_channel_t channel, rmt_source_clk_t base_clk);
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/**
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* @brief Get RMT source clock
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*
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* RMT module has two clock sources:
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* 1. APB clock which is 80Mhz
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* 2. REF tick clock, which would be 1Mhz (not supported in this version).
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*
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* @param channel RMT channel (0-7)
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*
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* @param src_clk Pointer to accept source clock for RMT module.
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*/
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esp_err_t rmt_get_source_clk(rmt_channel_t channel, rmt_source_clk_t* src_clk);
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/**
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* @brief Set RMT idle output level for transmitter
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*
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* @param channel RMT channel (0-7)
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*
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* @param idle_out_en To enable idle level output.
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*
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* @param level To set the output signal's level for channel 0-7 in idle state.
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*/
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esp_err_t rmt_set_idle_level(rmt_channel_t channel, bool idle_out_en, rmt_idle_level_t level);
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/**
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* @brief Get RMT status
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*
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* @param channel RMT channel (0-7)
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*
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* @param status Pointer to accept channel status.
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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*/
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esp_err_t rmt_get_status(rmt_channel_t channel, uint32_t* status);
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/**
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* @brief Set mask value to RMT interrupt enable register.
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*
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* @param mask Bit mask to set to the register
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*
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*/
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void rmt_set_intr_enable_mask(uint32_t mask);
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/**
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* @brief Clear mask value to RMT interrupt enable register.
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*
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* @param mask Bit mask to clear the register
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*
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*/
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void rmt_clr_intr_enable_mask(uint32_t mask);
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/**
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* @brief Set RMT RX interrupt enable
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*
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* @param channel RMT channel (0 - 7)
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*
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* @param en enable or disable RX interrupt.
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*
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* @return
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* - ESP_ERR_INVALID_ARG Parameter error
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* - ESP_OK Success
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||
*/
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esp_err_t rmt_set_rx_intr_en(rmt_channel_t channel, bool en);
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/**
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* @brief Set RMT RX error interrupt enable
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||
*
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* @param channel RMT channel (0 - 7)
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*
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||
* @param en enable or disable RX err interrupt.
|
||
*
|
||
* @return
|
||
* - ESP_ERR_INVALID_ARG Parameter error
|
||
* - ESP_OK Success
|
||
*/
|
||
esp_err_t rmt_set_err_intr_en(rmt_channel_t channel, bool en);
|
||
|
||
/**
|
||
* @brief Set RMT TX interrupt enable
|
||
*
|
||
* @param channel RMT channel (0 - 7)
|
||
*
|
||
* @param en enable or disable TX interrupt.
|
||
*
|
||
* @return
|
||
* - ESP_ERR_INVALID_ARG Parameter error
|
||
* - ESP_OK Success
|
||
*/
|
||
esp_err_t rmt_set_tx_intr_en(rmt_channel_t channel, bool en);
|
||
|
||
/**
|
||
* @brief Set RMT TX threshold event interrupt enable
|
||
*
|
||
* An interrupt will be triggered when the number of transmitted items reaches the threshold value
|
||
*
|
||
* @param channel RMT channel (0 - 7)
|
||
*
|
||
* @param en enable or disable TX event interrupt.
|
||
*
|
||
* @param evt_thresh RMT event interrupt threshold value
|
||
*
|
||
* @return
|
||
* - ESP_ERR_INVALID_ARG Parameter error
|
||
* - ESP_OK Success
|
||
*/
|
||
esp_err_t rmt_set_tx_thr_intr_en(rmt_channel_t channel, bool en, uint16_t evt_thresh);
|
||
|
||
/**
|
||
* @brief Set RMT pin
|
||
*
|
||
* @param channel RMT channel (0 - 7)
|
||
*
|
||
* @param mode TX or RX mode for RMT
|
||
*
|
||
* @param gpio_num GPIO number to transmit or receive the signal.
|
||
*
|
||
* @return
|
||
* - ESP_ERR_INVALID_ARG Parameter error
|
||
* - ESP_OK Success
|
||
*/
|
||
esp_err_t rmt_set_pin(rmt_channel_t channel, rmt_mode_t mode, gpio_num_t gpio_num);
|
||
|
||
/**
|
||
* @brief Configure RMT parameters
|
||
*
|
||
* @param rmt_param RMT parameter struct
|
||
*
|
||
* @return
|
||
* - ESP_ERR_INVALID_ARG Parameter error
|
||
* - ESP_OK Success
|
||
*/
|
||
esp_err_t rmt_config(const rmt_config_t* rmt_param);
|
||
|
||
/**
|
||
* @brief Register RMT interrupt handler, the handler is an ISR.
|
||
*
|
||
* The handler will be attached to the same CPU core that this function is running on.
|
||
*
|
||
* @note If you already called rmt_driver_install to use system RMT driver,
|
||
* please do not register ISR handler again.
|
||
*
|
||
* @param fn Interrupt handler function.
|
||
* @param arg Parameter for the handler function
|
||
* @param intr_alloc_flags Flags used to allocate the interrupt. One or multiple (ORred)
|
||
* ESP_INTR_FLAG_* values. See esp_intr_alloc.h for more info.
|
||
* @param handle If non-zero, a handle to later clean up the ISR gets stored here.
|
||
*
|
||
* @return
|
||
* - ESP_OK Success
|
||
* - ESP_ERR_INVALID_ARG Function pointer error.
|
||
* - ESP_FAIL System driver installed, can not register ISR handler for RMT
|
||
*/
|
||
esp_err_t rmt_isr_register(void (* fn)(void* ), void * arg, int intr_alloc_flags, rmt_isr_handle_t *handle);
|
||
|
||
/**
|
||
* @brief Deregister previously registered RMT interrupt handler
|
||
*
|
||
* @param handle Handle obtained from rmt_isr_register
|
||
*
|
||
* @return
|
||
* - ESP_OK Success
|
||
* - ESP_ERR_INVALID_ARG Handle invalid
|
||
*/
|
||
esp_err_t rmt_isr_deregister(rmt_isr_handle_t handle);
|
||
|
||
/**
|
||
* @brief Fill memory data of channel with given RMT items.
|
||
*
|
||
* @param channel RMT channel (0 - 7)
|
||
*
|
||
* @param item Pointer of items.
|
||
*
|
||
* @param item_num RMT sending items number.
|
||
*
|
||
* @param mem_offset Index offset of memory.
|
||
*
|
||
* @return
|
||
* - ESP_ERR_INVALID_ARG Parameter error
|
||
* - ESP_OK Success
|
||
*/
|
||
esp_err_t rmt_fill_tx_items(rmt_channel_t channel, const rmt_item32_t* item, uint16_t item_num, uint16_t mem_offset);
|
||
|
||
/**
|
||
* @brief Initialize RMT driver
|
||
*
|
||
* @param channel RMT channel (0 - 7)
|
||
*
|
||
* @param rx_buf_size Size of RMT RX ringbuffer. Can be 0 if the RX ringbuffer is not used.
|
||
*
|
||
* @param intr_alloc_flags Flags for the RMT driver interrupt handler. Pass 0 for default flags. See esp_intr_alloc.h for details.
|
||
*
|
||
* @return
|
||
* - ESP_ERR_INVALID_STATE Driver is already installed, call rmt_driver_uninstall first.
|
||
* - ESP_ERR_NO_MEM Memory allocation failure
|
||
* - ESP_ERR_INVALID_ARG Parameter error
|
||
* - ESP_OK Success
|
||
*/
|
||
esp_err_t rmt_driver_install(rmt_channel_t channel, size_t rx_buf_size, int intr_alloc_flags);
|
||
|
||
/**
|
||
* @brief Uninstall RMT driver.
|
||
*
|
||
* @param channel RMT channel (0 - 7)
|
||
*
|
||
* @return
|
||
* - ESP_ERR_INVALID_ARG Parameter error
|
||
* - ESP_OK Success
|
||
*/
|
||
esp_err_t rmt_driver_uninstall(rmt_channel_t channel);
|
||
|
||
/**
|
||
* @brief RMT send waveform from rmt_item array.
|
||
*
|
||
* This API allows user to send waveform with any length.
|
||
*
|
||
* @param channel RMT channel (0 - 7)
|
||
*
|
||
* @param rmt_item head point of RMT items array.
|
||
*
|
||
* @param item_num RMT data item number.
|
||
*
|
||
* @param wait_tx_done
|
||
* - If set 1, it will block the task and wait for sending done.
|
||
* - If set 0, it will not wait and return immediately.
|
||
*
|
||
* @note
|
||
* This function will not copy data, instead, it will point to the original items,
|
||
* and send the waveform items.
|
||
* If wait_tx_done is set to true, this function will block and will not return until
|
||
* all items have been sent out.
|
||
* If wait_tx_done is set to false, this function will return immediately, and the driver
|
||
* interrupt will continue sending the items. We must make sure the item data will not be
|
||
* damaged when the driver is still sending items in driver interrupt.
|
||
*
|
||
* @return
|
||
* - ESP_ERR_INVALID_ARG Parameter error
|
||
* - ESP_OK Success
|
||
*/
|
||
esp_err_t rmt_write_items(rmt_channel_t channel, const rmt_item32_t* rmt_item, int item_num, bool wait_tx_done);
|
||
|
||
/**
|
||
* @brief Wait RMT TX finished.
|
||
*
|
||
* @param channel RMT channel (0 - 7)
|
||
*
|
||
* @param wait_time Maximum time in ticks to wait for transmission to be complete
|
||
*
|
||
* @return
|
||
* - ESP_OK RMT Tx done successfully
|
||
* - ESP_ERR_TIMEOUT Exceeded the 'wait_time' given
|
||
* - ESP_ERR_INVALID_ARG Parameter error
|
||
* - ESP_FAIL Driver not installed
|
||
*/
|
||
esp_err_t rmt_wait_tx_done(rmt_channel_t channel, TickType_t wait_time);
|
||
|
||
/**
|
||
* @brief Get ringbuffer from RMT.
|
||
*
|
||
* Users can get the RMT RX ringbuffer handle, and process the RX data.
|
||
*
|
||
* @param channel RMT channel (0 - 7)
|
||
*
|
||
* @param buf_handle Pointer to buffer handle to accept RX ringbuffer handle.
|
||
*
|
||
* @return
|
||
* - ESP_ERR_INVALID_ARG Parameter error
|
||
* - ESP_OK Success
|
||
*/
|
||
esp_err_t rmt_get_ringbuf_handle(rmt_channel_t channel, RingbufHandle_t* buf_handle);
|
||
|
||
/*
|
||
* ----------------EXAMPLE OF RMT INTERRUPT ------------------
|
||
* @code{c}
|
||
*
|
||
* rmt_isr_register(rmt_isr, NULL, 0); //hook the ISR handler for RMT interrupt
|
||
* @endcode
|
||
* @note
|
||
* 0. If you have called rmt_driver_install, you don't need to set ISR handler any more.
|
||
*
|
||
* ----------------EXAMPLE OF INTERRUPT HANDLER ---------------
|
||
* @code{c}
|
||
* #include "esp_attr.h"
|
||
* void IRAM_ATTR rmt_isr_handler(void* arg)
|
||
* {
|
||
* //read RMT interrupt status.
|
||
* uint32_t intr_st = RMT.int_st.val;
|
||
*
|
||
* //you will find which channels have triggered an interrupt here,
|
||
* //then, you can post some event to RTOS queue to process the event.
|
||
* //later we will add a queue in the driver code.
|
||
*
|
||
* //clear RMT interrupt status.
|
||
* RMT.int_clr.val = intr_st;
|
||
* }
|
||
* @endcode
|
||
*
|
||
*--------------------------END OF EXAMPLE --------------------------
|
||
*/
|
||
|
||
|
||
|
||
#ifdef __cplusplus
|
||
}
|
||
#endif
|
||
|
||
#endif /* _DRIVER_RMT_CTRL_H_ */
|