f0859ac954
The EVSYS is used to generate an interrupt from the event. This simplifies timing used in pulseio that conflicted with the auto-reload countdown. Fixes #3890
384 lines
13 KiB
C
384 lines
13 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) 2018 Scott Shawcroft 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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#include "audio_dma.h"
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#include "samd/clocks.h"
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#include "samd/events.h"
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#include "samd/dma.h"
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#include "shared-bindings/audiocore/RawSample.h"
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#include "shared-bindings/audiocore/WaveFile.h"
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#include "supervisor/background_callback.h"
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#include "py/mpstate.h"
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#include "py/runtime.h"
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#if CIRCUITPY_AUDIOIO || CIRCUITPY_AUDIOBUSIO
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static audio_dma_t *audio_dma_state[AUDIO_DMA_CHANNEL_COUNT];
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// This cannot be in audio_dma_state because it's volatile.
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static volatile bool audio_dma_pending[AUDIO_DMA_CHANNEL_COUNT];
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static bool audio_dma_allocated[AUDIO_DMA_CHANNEL_COUNT];
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uint8_t find_sync_event_channel_raise() {
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uint8_t event_channel = find_sync_event_channel();
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if (event_channel >= EVSYS_SYNCH_NUM) {
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mp_raise_RuntimeError(translate("All sync event channels in use"));
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}
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return event_channel;
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}
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uint8_t dma_allocate_channel(void) {
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uint8_t channel;
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for (channel = 0; channel < AUDIO_DMA_CHANNEL_COUNT; channel++) {
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if (!audio_dma_allocated[channel]) {
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audio_dma_allocated[channel] = true;
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return channel;
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}
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}
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return channel; // i.e., return failure
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}
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void dma_free_channel(uint8_t channel) {
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assert(channel < AUDIO_DMA_CHANNEL_COUNT);
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assert(audio_dma_allocated[channel]);
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audio_dma_disable_channel(channel);
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audio_dma_allocated[channel] = false;
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}
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void audio_dma_disable_channel(uint8_t channel) {
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if (channel >= AUDIO_DMA_CHANNEL_COUNT) {
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return;
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}
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dma_disable_channel(channel);
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}
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void audio_dma_enable_channel(uint8_t channel) {
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if (channel >= AUDIO_DMA_CHANNEL_COUNT) {
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return;
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}
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dma_enable_channel(channel);
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}
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void audio_dma_convert_signed(audio_dma_t *dma, uint8_t *buffer, uint32_t buffer_length,
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uint8_t **output_buffer, uint32_t *output_buffer_length,
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uint8_t *output_spacing) {
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if (dma->first_buffer_free) {
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*output_buffer = dma->first_buffer;
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} else {
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*output_buffer = dma->second_buffer;
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}
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wcast-align"
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if (dma->signed_to_unsigned || dma->unsigned_to_signed) {
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*output_buffer_length = buffer_length / dma->spacing;
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*output_spacing = 1;
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uint32_t out_i = 0;
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if (dma->bytes_per_sample == 1) {
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for (uint32_t i = 0; i < buffer_length; i += dma->spacing) {
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if (dma->signed_to_unsigned) {
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((uint8_t *)*output_buffer)[out_i] = ((int8_t *)buffer)[i] + 0x80;
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} else {
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((int8_t *)*output_buffer)[out_i] = ((uint8_t *)buffer)[i] - 0x80;
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}
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out_i += 1;
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}
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} else if (dma->bytes_per_sample == 2) {
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for (uint32_t i = 0; i < buffer_length / 2; i += dma->spacing) {
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if (dma->signed_to_unsigned) {
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((uint16_t *)*output_buffer)[out_i] = ((int16_t *)buffer)[i] + 0x8000;
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} else {
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((int16_t *)*output_buffer)[out_i] = ((uint16_t *)buffer)[i] - 0x8000;
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}
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out_i += 1;
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}
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}
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} else {
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*output_buffer = buffer;
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*output_buffer_length = buffer_length;
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*output_spacing = dma->spacing;
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}
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#pragma GCC diagnostic pop
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dma->first_buffer_free = !dma->first_buffer_free;
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}
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void audio_dma_load_next_block(audio_dma_t *dma) {
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uint8_t *buffer;
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uint32_t buffer_length;
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audioio_get_buffer_result_t get_buffer_result =
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audiosample_get_buffer(dma->sample, dma->single_channel_output, dma->audio_channel,
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&buffer, &buffer_length);
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DmacDescriptor *descriptor = dma->second_descriptor;
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if (dma->first_descriptor_free) {
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descriptor = dma_descriptor(dma->dma_channel);
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}
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dma->first_descriptor_free = !dma->first_descriptor_free;
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if (get_buffer_result == GET_BUFFER_ERROR) {
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audio_dma_stop(dma);
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return;
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}
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uint8_t *output_buffer;
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uint32_t output_buffer_length;
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uint8_t output_spacing;
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audio_dma_convert_signed(dma, buffer, buffer_length, &output_buffer, &output_buffer_length,
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&output_spacing);
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descriptor->BTCNT.reg = output_buffer_length / dma->beat_size / output_spacing;
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descriptor->SRCADDR.reg = ((uint32_t)output_buffer) + output_buffer_length;
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if (get_buffer_result == GET_BUFFER_DONE) {
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if (dma->loop) {
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audiosample_reset_buffer(dma->sample, dma->single_channel_output, dma->audio_channel);
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} else {
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descriptor->DESCADDR.reg = 0;
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}
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}
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descriptor->BTCTRL.bit.VALID = true;
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}
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static void setup_audio_descriptor(DmacDescriptor *descriptor, uint8_t beat_size,
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uint8_t spacing, uint32_t output_register_address) {
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uint32_t beat_size_reg = DMAC_BTCTRL_BEATSIZE_BYTE;
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if (beat_size == 2) {
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beat_size_reg = DMAC_BTCTRL_BEATSIZE_HWORD;
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} else if (beat_size == 4) {
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beat_size_reg = DMAC_BTCTRL_BEATSIZE_WORD;
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}
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descriptor->BTCTRL.reg = beat_size_reg |
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DMAC_BTCTRL_SRCINC |
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DMAC_BTCTRL_EVOSEL_BLOCK |
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DMAC_BTCTRL_STEPSIZE(spacing - 1) |
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DMAC_BTCTRL_STEPSEL_SRC;
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descriptor->DSTADDR.reg = output_register_address;
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}
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// Playback should be shutdown before calling this.
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audio_dma_result audio_dma_setup_playback(audio_dma_t *dma,
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mp_obj_t sample,
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bool loop,
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bool single_channel_output,
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uint8_t audio_channel,
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bool output_signed,
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uint32_t output_register_address,
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uint8_t dma_trigger_source) {
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uint8_t dma_channel = dma_allocate_channel();
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if (dma_channel >= AUDIO_DMA_CHANNEL_COUNT) {
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return AUDIO_DMA_DMA_BUSY;
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}
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dma->sample = sample;
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dma->loop = loop;
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dma->single_channel_output = single_channel_output;
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dma->audio_channel = audio_channel;
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dma->dma_channel = dma_channel;
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dma->signed_to_unsigned = false;
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dma->unsigned_to_signed = false;
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dma->second_descriptor = NULL;
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dma->spacing = 1;
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dma->first_descriptor_free = true;
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audiosample_reset_buffer(sample, single_channel_output, audio_channel);
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bool single_buffer;
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bool samples_signed;
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uint32_t max_buffer_length;
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audiosample_get_buffer_structure(sample, single_channel_output, &single_buffer, &samples_signed,
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&max_buffer_length, &dma->spacing);
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uint8_t output_spacing = dma->spacing;
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if (output_signed != samples_signed) {
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output_spacing = 1;
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max_buffer_length /= dma->spacing;
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dma->first_buffer = (uint8_t *)m_realloc(dma->first_buffer, max_buffer_length);
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if (dma->first_buffer == NULL) {
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return AUDIO_DMA_MEMORY_ERROR;
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}
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dma->first_buffer_free = true;
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if (!single_buffer) {
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dma->second_buffer = (uint8_t *)m_realloc(dma->second_buffer, max_buffer_length);
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if (dma->second_buffer == NULL) {
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return AUDIO_DMA_MEMORY_ERROR;
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}
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}
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dma->signed_to_unsigned = !output_signed && samples_signed;
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dma->unsigned_to_signed = output_signed && !samples_signed;
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}
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dma->event_channel = 0xff;
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if (!single_buffer) {
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dma->second_descriptor = (DmacDescriptor *)m_malloc(sizeof(DmacDescriptor), false);
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if (dma->second_descriptor == NULL) {
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return AUDIO_DMA_MEMORY_ERROR;
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}
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// We're likely double buffering so set up the block interrupts.
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turn_on_event_system();
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dma->event_channel = find_sync_event_channel_raise();
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init_event_channel_interrupt(dma->event_channel, CORE_GCLK, EVSYS_ID_GEN_DMAC_CH_0 + dma_channel);
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// We keep the audio_dma_t for internal use and the sample as a root pointer because it
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// contains the audiodma structure.
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audio_dma_state[dma->dma_channel] = dma;
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MP_STATE_PORT(playing_audio)[dma->dma_channel] = dma->sample;
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}
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if (audiosample_bits_per_sample(sample) == 16) {
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dma->beat_size = 2;
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dma->bytes_per_sample = 2;
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} else {
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dma->beat_size = 1;
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dma->bytes_per_sample = 1;
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if (single_channel_output) {
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output_register_address += 1;
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}
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}
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// Transfer both channels at once.
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if (!single_channel_output && audiosample_channel_count(sample) == 2) {
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dma->beat_size *= 2;
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}
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#ifdef SAM_D5X_E5X
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int irq = dma->event_channel < 4 ? EVSYS_0_IRQn + dma->event_channel : EVSYS_4_IRQn;
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// Only disable and clear on SAMD51 because the SAMD21 shares EVSYS with ticks.
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NVIC_DisableIRQ(irq);
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NVIC_ClearPendingIRQ(irq);
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#else
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int irq = EVSYS_IRQn;
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#endif
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DmacDescriptor *first_descriptor = dma_descriptor(dma_channel);
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setup_audio_descriptor(first_descriptor, dma->beat_size, output_spacing, output_register_address);
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if (single_buffer) {
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first_descriptor->DESCADDR.reg = 0;
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if (dma->loop) {
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first_descriptor->DESCADDR.reg = (uint32_t)first_descriptor;
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}
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} else {
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first_descriptor->DESCADDR.reg = (uint32_t)dma->second_descriptor;
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setup_audio_descriptor(dma->second_descriptor, dma->beat_size, output_spacing, output_register_address);
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dma->second_descriptor->DESCADDR.reg = (uint32_t)first_descriptor;
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}
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// Load the first two blocks up front.
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audio_dma_load_next_block(dma);
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if (!single_buffer) {
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audio_dma_load_next_block(dma);
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}
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dma_configure(dma_channel, dma_trigger_source, true);
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audio_dma_enable_channel(dma_channel);
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NVIC_EnableIRQ(irq);
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return AUDIO_DMA_OK;
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}
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void audio_dma_stop(audio_dma_t *dma) {
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uint8_t channel = dma->dma_channel;
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if (channel < AUDIO_DMA_CHANNEL_COUNT) {
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audio_dma_disable_channel(channel);
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disable_event_channel(dma->event_channel);
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MP_STATE_PORT(playing_audio)[channel] = NULL;
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audio_dma_state[channel] = NULL;
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dma_free_channel(dma->dma_channel);
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}
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dma->dma_channel = AUDIO_DMA_CHANNEL_COUNT;
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}
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void audio_dma_pause(audio_dma_t *dma) {
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dma_suspend_channel(dma->dma_channel);
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}
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void audio_dma_resume(audio_dma_t *dma) {
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dma_resume_channel(dma->dma_channel);
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}
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bool audio_dma_get_paused(audio_dma_t *dma) {
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if (dma->dma_channel >= AUDIO_DMA_CHANNEL_COUNT) {
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return false;
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}
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uint32_t status = dma_transfer_status(dma->dma_channel);
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return (status & DMAC_CHINTFLAG_SUSP) != 0;
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}
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void audio_dma_init(audio_dma_t *dma) {
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dma->dma_channel = AUDIO_DMA_CHANNEL_COUNT;
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}
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void audio_dma_reset(void) {
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for (uint8_t i = 0; i < AUDIO_DMA_CHANNEL_COUNT; i++) {
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audio_dma_state[i] = NULL;
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audio_dma_pending[i] = false;
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audio_dma_allocated[i] = false;
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audio_dma_disable_channel(i);
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dma_descriptor(i)->BTCTRL.bit.VALID = false;
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MP_STATE_PORT(playing_audio)[i] = NULL;
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}
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}
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bool audio_dma_get_playing(audio_dma_t *dma) {
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if (dma->dma_channel >= AUDIO_DMA_CHANNEL_COUNT) {
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return false;
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}
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uint32_t status = dma_transfer_status(dma->dma_channel);
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if ((status & DMAC_CHINTFLAG_TCMPL) != 0 || (status & DMAC_CHINTFLAG_TERR) != 0) {
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audio_dma_stop(dma);
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}
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return (status & DMAC_CHINTFLAG_TERR) == 0;
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}
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// WARN(tannewt): DO NOT print from here, or anything it calls. Printing calls
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// background tasks such as this and causes a stack overflow.
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STATIC void dma_callback_fun(void *arg) {
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audio_dma_t *dma = arg;
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if (dma == NULL) {
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return;
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}
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audio_dma_load_next_block(dma);
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}
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void audio_evsys_handler(void) {
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for (uint8_t i = 0; i < AUDIO_DMA_CHANNEL_COUNT; i++) {
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audio_dma_t *dma = audio_dma_state[i];
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if (dma == NULL) {
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continue;
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}
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bool block_done = event_interrupt_active(dma->event_channel);
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if (!block_done) {
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continue;
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}
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background_callback_add(&dma->callback, dma_callback_fun, (void *)dma);
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}
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}
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#endif
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