430bcdb59d
There were _possibly_ problems where this routine was being entered by direct call AND by background callback. Schedule the work here, and it will be done almost immediately, without worry about interference. I don't know if this is strictly necessary, but it doesn't hurt. Since the I2S clock is being run all the time, we have to enter the background task to fill the FIFO with zeros constantly anyway.
246 lines
8.9 KiB
C
246 lines
8.9 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) 2020 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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#include <string.h>
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#include "py/runtime.h"
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#include "i2s_common.h"
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#include "bindings/espidf/__init__.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "shared-module/audiocore/__init__.h"
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#define I2S_QUEUE_SIZE (3)
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static i2s_t *i2s_instance[I2S_NUM_MAX];
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static QueueHandle_t i2s_queues[I2S_NUM_MAX];
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static TaskHandle_t i2s_tasks[I2S_NUM_MAX];
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static int8_t port_i2s_allocate(void) {
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#if defined(I2S_NUM_1)
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if(!i2s_instance[1]) return 1;
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#endif
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if(!i2s_instance[0]) return 0;
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mp_raise_RuntimeError(translate("Peripheral in use"));
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}
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void port_i2s_reset_instance(int i) {
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assert(i >= 0 && i < I2S_NUM_MAX);
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if (i2s_tasks[i]) {
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vTaskDelete(i2s_tasks[i]);
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}
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i2s_tasks[i] = NULL;
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(void)i2s_driver_uninstall(i);
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i2s_instance[i] = NULL;
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}
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void i2s_reset(void) {
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for (int i=0; i < I2S_NUM_MAX; i++) {
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port_i2s_reset_instance(i);
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}
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}
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static void i2s_fill_buffer(i2s_t *self) {
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if (self->instance < 0 || self->instance >= I2S_NUM_MAX) {
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return;
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}
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#define STACK_BUFFER_SIZE (512)
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int16_t signed_samples[STACK_BUFFER_SIZE / sizeof(int16_t)];
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if (!self->playing || self->paused || !self->sample || self->stopping) {
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memset(signed_samples, 0, sizeof(signed_samples));
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size_t bytes_written = 0;
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do {
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ESP_CALL_RAISE(i2s_write(self->instance, signed_samples, sizeof(signed_samples), &bytes_written, 0));
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} while (bytes_written != 0);
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return;
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}
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while (!self->stopping) {
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if (self->sample_data == self->sample_end) {
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uint32_t sample_buffer_length;
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audioio_get_buffer_result_t get_buffer_result =
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audiosample_get_buffer(self->sample, false, 0,
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&self->sample_data, &sample_buffer_length);
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self->sample_end = self->sample_data + sample_buffer_length;
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if (get_buffer_result == GET_BUFFER_DONE) {
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if (self->loop) {
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audiosample_reset_buffer(self->sample, false, 0);
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} else {
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self->stopping = true;
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break;
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}
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}
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if (get_buffer_result == GET_BUFFER_ERROR || sample_buffer_length == 0) {
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self->stopping = true;
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break;
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}
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}
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size_t bytes_written = 0;
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size_t bytecount = self->sample_end - self->sample_data;
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if (self->samples_signed && self->channel_count == 2) {
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if (self->bytes_per_sample == 2) {
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ESP_CALL_RAISE(i2s_write(self->instance, self->sample_data, bytecount, &bytes_written, 0));
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} else {
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ESP_CALL_RAISE(i2s_write_expand(self->instance, self->sample_data, bytecount, 8, 16, &bytes_written, 0));
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}
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} else {
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const size_t bytes_per_output_frame = 4;
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size_t bytes_per_input_frame = self->channel_count * self->bytes_per_sample;
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size_t framecount = MIN(STACK_BUFFER_SIZE / bytes_per_output_frame, bytecount / bytes_per_input_frame);
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if (self->samples_signed) {
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assert(self->channel_count == 1);
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if (self->bytes_per_sample == 1) {
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audiosample_convert_s8m_s16s(signed_samples, (int8_t*)(void*)self->sample_data, framecount);
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} else {
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audiosample_convert_s16m_s16s(signed_samples, (int16_t*)(void*)self->sample_data, framecount);
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}
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} else {
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if (self->channel_count == 1) {
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if (self->bytes_per_sample == 1) {
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audiosample_convert_u8m_s16s(signed_samples, (uint8_t*)(void*)self->sample_data, framecount);
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} else {
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audiosample_convert_u16m_s16s(signed_samples, (uint16_t*)(void*)self->sample_data, framecount);
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}
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} else {
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if (self->bytes_per_sample == 1) {
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audiosample_convert_u8s_s16s(signed_samples, (uint8_t*)(void*)self->sample_data, framecount);
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} else {
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audiosample_convert_u16s_s16s(signed_samples, (uint16_t*)(void*)self->sample_data, framecount);
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}
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}
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}
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size_t expanded_bytes_written = 0;
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ESP_CALL_RAISE(i2s_write(self->instance, signed_samples, bytes_per_output_frame*framecount, &expanded_bytes_written, 0));
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assert(expanded_bytes_written % 4 == 0);
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bytes_written = expanded_bytes_written / bytes_per_output_frame * bytes_per_input_frame;
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}
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self->sample_data += bytes_written;
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// We have filled the DMA buffer
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if (!bytes_written) {
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break;
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}
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}
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}
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static void i2s_callback_fun(void *self_in) {
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i2s_t *self = self_in;
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i2s_fill_buffer(self);
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}
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static void i2s_event_task(void *self_in) {
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i2s_t *self = self_in;
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while(true) {
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i2s_event_type_t event;
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BaseType_t result = xQueueReceive(i2s_queues[self->instance], &event, portMAX_DELAY);
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if (result && event == I2S_EVENT_TX_DONE) {
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background_callback_add(&self->callback, i2s_callback_fun, self_in);
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}
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}
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}
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void port_i2s_allocate_init(i2s_t *self, bool left_justified) {
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self->instance = port_i2s_allocate();
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i2s_config_t i2s_config = {
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.mode = I2S_MODE_MASTER | I2S_MODE_TX,
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.sample_rate = 44100,
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.bits_per_sample = 16,
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.channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
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.communication_format = left_justified ? I2S_COMM_FORMAT_STAND_I2S : I2S_COMM_FORMAT_STAND_I2S,
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.dma_buf_count = 2,
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.dma_buf_len = 128, // in _frames_, so 128 is 512 bytes per dma buf
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.use_apll = false,
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};
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ESP_CALL_RAISE(i2s_driver_install(self->instance, &i2s_config, I2S_QUEUE_SIZE, &i2s_queues[self->instance]));
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if (!xTaskCreate(i2s_event_task, "I2S_task", 3 * configMINIMAL_STACK_SIZE, self, CONFIG_PTHREAD_TASK_PRIO_DEFAULT, &i2s_tasks[self->instance])) {
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mp_raise_OSError_msg(translate("xTaskCreate failed"));
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}
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i2s_instance[self->instance] = self;
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}
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void port_i2s_play(i2s_t *self, mp_obj_t sample, bool loop) {
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self->sample = sample;
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self->loop = loop;
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self->bytes_per_sample = audiosample_bits_per_sample(sample) / 8;
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self->channel_count = audiosample_channel_count(sample);
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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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uint8_t spacing;
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audiosample_get_buffer_structure(sample, false, &single_buffer, &samples_signed,
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&max_buffer_length, &spacing);
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self->samples_signed = samples_signed;
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self->playing = true;
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self->paused = false;
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self->stopping = false;
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self->sample_data = self->sample_end = NULL;
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// We always output stereo so output twice as many bits.
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// uint16_t bits_per_sample_output = bits_per_sample * 2;
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audiosample_reset_buffer(self->sample, false, 0);
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ESP_CALL_RAISE(i2s_set_sample_rates(self->instance, audiosample_sample_rate(sample)));
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background_callback_add(&self->callback, i2s_callback_fun, self);
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}
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bool port_i2s_playing(i2s_t *self) {
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return self->playing && !self->stopping;
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}
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bool port_i2s_paused(i2s_t *self) {
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return self->paused;
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}
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void port_i2s_stop(i2s_t *self) {
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self->sample = NULL;
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self->paused = false;
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self->playing = false;
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self->stopping = false;
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}
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void port_i2s_pause(i2s_t *self) {
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if (!self->paused) {
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self->paused = true;
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ESP_CALL_RAISE(i2s_stop(self->instance));
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}
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}
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void port_i2s_resume(i2s_t *self) {
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if (self->paused) {
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self->paused = false;
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ESP_CALL_RAISE(i2s_start(self->instance));
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}
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}
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