87 lines
2.8 KiB
C
87 lines
2.8 KiB
C
// Copyright 2015-2019 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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#pragma once
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#include <esp_types.h>
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#include "soc/sigmadelta_periph.h"
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#include "soc/sigmadelta_caps.h"
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#include "driver/gpio.h"
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#include "hal/sigmadelta_types.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Configure Sigma-delta channel
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*
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* @param config Pointer of Sigma-delta channel configuration struct
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE sigmadelta driver already initialized
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* - ESP_ERR_INVALID_ARG Parameter error
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*/
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esp_err_t sigmadelta_config(const sigmadelta_config_t *config);
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/**
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* @brief Set Sigma-delta channel duty.
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*
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* This function is used to set Sigma-delta channel duty,
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* If you add a capacitor between the output pin and ground,
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* the average output voltage will be Vdc = VDDIO / 256 * duty + VDDIO/2,
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* where VDDIO is the power supply voltage.
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*
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* @param channel Sigma-delta channel number
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* @param duty Sigma-delta duty of one channel, the value ranges from -128 to 127, recommended range is -90 ~ 90.
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* The waveform is more like a random one in this range.
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE sigmadelta driver has not been initialized
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* - ESP_ERR_INVALID_ARG Parameter error
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*/
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esp_err_t sigmadelta_set_duty(sigmadelta_channel_t channel, int8_t duty);
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/**
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* @brief Set Sigma-delta channel's clock pre-scale value.
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* The source clock is APP_CLK, 80MHz. The clock frequency of the sigma-delta channel is APP_CLK / pre_scale
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*
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* @param channel Sigma-delta channel number
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* @param prescale The divider of source clock, ranges from 0 to 255
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE sigmadelta driver has not been initialized
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* - ESP_ERR_INVALID_ARG Parameter error
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*/
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esp_err_t sigmadelta_set_prescale(sigmadelta_channel_t channel, uint8_t prescale);
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/**
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* @brief Set Sigma-delta signal output pin
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*
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* @param channel Sigma-delta channel number
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* @param gpio_num GPIO number of output pin.
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE sigmadelta driver has not been initialized
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* - ESP_ERR_INVALID_ARG Parameter error
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*/
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esp_err_t sigmadelta_set_pin(sigmadelta_channel_t channel, gpio_num_t gpio_num);
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#ifdef _cplusplus
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}
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#endif
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