110 lines
3.7 KiB
C
110 lines
3.7 KiB
C
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
#ifndef __DRIVER_SIGMADELTA_H__
|
|
#define __DRIVER_SIGMADELTA_H__
|
|
#include <esp_types.h>
|
|
#include "soc/gpio_sd_struct.h"
|
|
#include "soc/gpio_sd_reg.h"
|
|
#include "driver/gpio.h"
|
|
|
|
#ifdef _cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/**
|
|
* @brief Sigma-delta channel list
|
|
*/
|
|
typedef enum{
|
|
SIGMADELTA_CHANNEL_0 = 0, /*!< Sigma-delta channel 0 */
|
|
SIGMADELTA_CHANNEL_1 = 1, /*!< Sigma-delta channel 1 */
|
|
SIGMADELTA_CHANNEL_2 = 2, /*!< Sigma-delta channel 2 */
|
|
SIGMADELTA_CHANNEL_3 = 3, /*!< Sigma-delta channel 3 */
|
|
SIGMADELTA_CHANNEL_4 = 4, /*!< Sigma-delta channel 4 */
|
|
SIGMADELTA_CHANNEL_5 = 5, /*!< Sigma-delta channel 5 */
|
|
SIGMADELTA_CHANNEL_6 = 6, /*!< Sigma-delta channel 6 */
|
|
SIGMADELTA_CHANNEL_7 = 7, /*!< Sigma-delta channel 7 */
|
|
SIGMADELTA_CHANNEL_MAX,
|
|
} sigmadelta_channel_t;
|
|
|
|
/**
|
|
* @brief Sigma-delta configure struct
|
|
*/
|
|
typedef struct {
|
|
sigmadelta_channel_t channel; /*!< Sigma-delta channel number */
|
|
int8_t sigmadelta_duty; /*!< Sigma-delta duty, duty ranges from -128 to 127. */
|
|
uint8_t sigmadelta_prescale; /*!< Sigma-delta prescale, prescale ranges from 0 to 255. */
|
|
uint8_t sigmadelta_gpio; /*!< Sigma-delta output io number, refer to gpio.h for more details. */
|
|
} sigmadelta_config_t;
|
|
|
|
/**
|
|
* @brief Configure Sigma-delta channel
|
|
*
|
|
* @param config Pointer of Sigma-delta channel configuration struct
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t sigmadelta_config(const sigmadelta_config_t *config);
|
|
|
|
/**
|
|
* @brief Set Sigma-delta channel duty.
|
|
*
|
|
* This function is used to set Sigma-delta channel duty,
|
|
* If you add a capacitor between the output pin and ground,
|
|
* the average output voltage will be Vdc = VDDIO / 256 * duty + VDDIO/2,
|
|
* where VDDIO is the power supply voltage.
|
|
*
|
|
* @param channel Sigma-delta channel number
|
|
* @param duty Sigma-delta duty of one channel, the value ranges from -128 to 127, recommended range is -90 ~ 90.
|
|
* The waveform is more like a random one in this range.
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t sigmadelta_set_duty(sigmadelta_channel_t channel, int8_t duty);
|
|
|
|
/**
|
|
* @brief Set Sigma-delta channel's clock pre-scale value.
|
|
* The source clock is APP_CLK, 80MHz. The clock frequency of the sigma-delta channel is APP_CLK / pre_scale
|
|
*
|
|
* @param channel Sigma-delta channel number
|
|
* @param prescale The divider of source clock, ranges from 0 to 255
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t sigmadelta_set_prescale(sigmadelta_channel_t channel, uint8_t prescale);
|
|
|
|
/**
|
|
* @brief Set Sigma-delta signal output pin
|
|
*
|
|
* @param channel Sigma-delta channel number
|
|
* @param gpio_num GPIO number of output pin.
|
|
*
|
|
* @return
|
|
* - ESP_OK Success
|
|
* - ESP_ERR_INVALID_ARG Parameter error
|
|
*/
|
|
esp_err_t sigmadelta_set_pin(sigmadelta_channel_t channel, gpio_num_t gpio_num);
|
|
|
|
#ifdef _cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|