mirror of https://github.com/google/pebble
92 lines
2.6 KiB
C
92 lines
2.6 KiB
C
/*
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* Copyright 2024 Google LLC
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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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*
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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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*/
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#pragma once
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#include "board/board.h"
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#include "drivers/mic.h"
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#include <os/mutex.h>
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#include <util/circular_buffer.h>
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#include <stdbool.h>
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#include <stdint.h>
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#define DFSDM_BUFFER_LENGTH (256) // Each buffer fills up 64 times per second
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#define DFSDM_CIRC_BUFFER_SIZE (DFSDM_BUFFER_LENGTH * sizeof(uint16_t) * 2)
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// Note: If the MCU has cache, this needs to be placed in DMA_BSS.
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typedef struct MicState {
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int32_t in_buffer[2][DFSDM_BUFFER_LENGTH]; // 2k
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uint8_t circ_buf_store[DFSDM_CIRC_BUFFER_SIZE]; // 1k
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CircularBuffer circ_buffer;
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bool initialized;
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bool running;
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bool main_pending;
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bool bg_pending;
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uint32_t overflow_cnt;
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uint32_t bytes_received;
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int samples_to_discard;
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int64_t hpf_y1; // Previous value of HPF output
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int16_t prev_r; // Previous random number generated for dithering
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uint16_t volume;
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// A mutex is needed to protect against a race condition between
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// mic_stop and the dispatch routine potentially resulting in the
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// deallocation of the subscriber module's receive buffer while the
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// dispatch routine is still running.
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PebbleRecursiveMutex *mic_mutex;
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struct MicSubscriber {
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MicDataHandlerCB callback;
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int16_t *buffer;
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void *context;
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size_t size;
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size_t idx;
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} subscriber;
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} MicDeviceState;
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typedef const struct MicDevice {
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MicDeviceState *state;
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DFSDM_TypeDef *filter;
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DFSDM_Channel_TypeDef *channel;
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uint32_t extremes_detector_channel;
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uint32_t regular_channel;
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uint32_t pdm_frequency;
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uint32_t rcc_apb_periph;
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DMARequest *dma;
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AfConfig ck_gpio;
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AfConfig sd_gpio;
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int power_on_delay_ms;
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int settling_delay_ms;
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// Volume scalar (max 256)
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uint16_t default_volume;
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// Final right shift after applying gain control. It should be adjusted per watch family such that
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// a volume of 128 provides approximate half of full-scale deflection for normal speech on a
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// bigboard
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int final_right_shift;
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//! Function pointer to power the microphone hardware on or off.
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//! May be NULL.
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void (*mic_power_state_fn)(bool enabled);
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} MicDevice;
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