Add dshot_esc_encoder from dshot_esc esp-idf example

main/dshot_esc_encoder.h

@@ -0,0 +1,47 @@
+/*
+ * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "driver/rmt_encoder.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Throttle representation in DShot protocol
+ */
+typedef struct {
+    uint16_t throttle;  /*!< Throttle value */
+    bool telemetry_req; /*!< Telemetry request */
+} dshot_esc_throttle_t;
+
+/**
+ * @brief Type of Dshot ESC encoder configuration
+ */
+typedef struct {
+    uint32_t resolution;    /*!< Encoder resolution, in Hz */
+    uint32_t baud_rate;     /*!< Dshot protocol runs at several different baud rates, e.g. DSHOT300 = 300k baud rate */
+    uint32_t post_delay_us; /*!< Delay time after one Dshot frame, in microseconds */
+} dshot_esc_encoder_config_t;
+
+/**
+ * @brief Create RMT encoder for encoding Dshot ESC frame into RMT symbols
+ *
+ * @param[in] config Encoder configuration
+ * @param[out] ret_encoder Returned encoder handle
+ * @return
+ *      - ESP_ERR_INVALID_ARG for any invalid arguments
+ *      - ESP_ERR_NO_MEM out of memory when creating Dshot ESC encoder
+ *      - ESP_OK if creating encoder successfully
+ */
+esp_err_t rmt_new_dshot_esc_encoder(const dshot_esc_encoder_config_t *config, rmt_encoder_handle_t *ret_encoder);
+
+#ifdef __cplusplus
+}
+#endif