3e85c1886e
Enable with ./tools/configure.sh -l esp32-devkitc:dac DAC channel 0 = GPIO 25 DAC channel 1 = GPIO 26 default path: /dev/dac0 Resolution 8 bits = values 0~255 Voltage: 0~Vref The reference voltage 'Vref' here is input from the pin VDD3P3_RTC which ideally equals to the power supply VDD (3.3V).
85 lines
3.1 KiB
C
85 lines
3.1 KiB
C
/****************************************************************************
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* boards/xtensa/esp32/common/include/esp32_board_dac.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __BOARDS_XTENSA_ESP32_COMMON_INCLUDE_ESP32_DAC_H
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#define __BOARDS_XTENSA_ESP32_COMMON_INCLUDE_ESP32_DAC_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Type Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Inline Functions
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****************************************************************************/
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: board_dac_initialize
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*
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* Description:
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* Initialize and register the Digital to Analog Convertor (DAC) driver.
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*
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* Input Parameters:
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* path - The device number, used to build the device path as
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* /dev/dacN
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int board_dac_initialize(const char *path);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __BOARDS_XTENSA_ESP32_COMMON_INCLUDE_ESP32_DAC_H */
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