bd6826496c
1. Check for correct error values from dma_claim_unused_channel. 2. Introduce a .stereo flag for simplicity. 3. Clarify PWM carrier frequency choice. 4. Start introducing quiescent audio value. Still need to ramp up/down. 5. Redo audio stop logic a bit. 6. Fix (unrelated) displayio dependency things. There is still an interference problem between other DMA users and audio. Still debugging this.
49 lines
1.8 KiB
C
49 lines
1.8 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2019 Jeff Epler for Adafruit Industries
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef MICROPY_INCLUDED_RASPBERRYPI_COMMON_HAL_AUDIOPWMIO_PWMAUDIOOUT_H
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#define MICROPY_INCLUDED_RASPBERRYPI_COMMON_HAL_AUDIOPWMIO_PWMAUDIOOUT_H
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#include "common-hal/pwmio/PWMOut.h"
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#include "audio_dma.h"
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typedef struct {
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mp_obj_base_t base;
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pwmio_pwmout_obj_t left_pwm;
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pwmio_pwmout_obj_t right_pwm;
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audio_dma_t dma;
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uint16_t quiescent_value;
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uint8_t pacing_timer;
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bool stereo; // if false, only using left_pwm.
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} audiopwmio_pwmaudioout_obj_t;
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void audiopwmout_reset(void);
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void audiopwmout_background(void);
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#endif // MICROPY_INCLUDED_RASPBERRYPI_COMMON_HAL_AUDIOPWMIO_PWMAUDIOOUT_H
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