585 lines
18 KiB
C
585 lines
18 KiB
C
/*
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* The MIT License (MIT)
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*
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* Copyright (c) 2020 Reinhard Panhuber
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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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*/
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/* plot_audio_samples.py requires following modules:
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* $ sudo apt install libportaudio
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* $ pip3 install sounddevice matplotlib
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*
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* Then run
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* $ python3 plot_audio_samples.py
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include "bsp/board_api.h"
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#include "tusb.h"
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#if TUSB_MCU_VENDOR_ESPRESSIF
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// ESP-IDF need "freertos/" prefix in include path.
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// CFG_TUSB_OS_INC_PATH should be defined accordingly.
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#include "freertos/FreeRTOS.h"
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#include "freertos/semphr.h"
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#include "freertos/queue.h"
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#include "freertos/task.h"
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#include "freertos/timers.h"
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#define USBD_STACK_SIZE 4096
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#else
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#include "FreeRTOS.h"
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#include "semphr.h"
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#include "queue.h"
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#include "task.h"
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#include "timers.h"
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// Increase stack size when debug log is enabled
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#define USBD_STACK_SIZE (4*configMINIMAL_STACK_SIZE/2) * (CFG_TUSB_DEBUG ? 2 : 1)
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#endif
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#define BLINKY_STACK_SIZE configMINIMAL_STACK_SIZE
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#define AUDIO_STACK_SIZE configMINIMAL_STACK_SIZE
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//--------------------------------------------------------------------+
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// MACRO CONSTANT TYPEDEF PROTYPES
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//--------------------------------------------------------------------+
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#define AUDIO_SAMPLE_RATE CFG_TUD_AUDIO_FUNC_1_SAMPLE_RATE
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/* Blink pattern
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* - 250 ms : device not mounted
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* - 1000 ms : device mounted
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* - 2500 ms : device is suspended
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*/
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enum {
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BLINK_NOT_MOUNTED = 250,
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BLINK_MOUNTED = 1000,
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BLINK_SUSPENDED = 2500,
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};
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// static task
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#if configSUPPORT_STATIC_ALLOCATION
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StackType_t blinky_stack[BLINKY_STACK_SIZE];
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StaticTask_t blinky_taskdef;
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StackType_t usb_device_stack[USBD_STACK_SIZE];
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StaticTask_t usb_device_taskdef;
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StackType_t audio_stack[AUDIO_STACK_SIZE];
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StaticTask_t audio_taskdef;
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#endif
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static uint32_t blink_interval_ms = BLINK_NOT_MOUNTED;
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// Audio controls
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// Current states
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bool mute[CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX + 1]; // +1 for master channel 0
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uint16_t volume[CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX + 1]; // +1 for master channel 0
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uint32_t sampFreq;
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uint8_t clkValid;
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// Range states
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audio_control_range_2_n_t(1) volumeRng[CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX+1]; // Volume range state
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audio_control_range_4_n_t(1) sampleFreqRng; // Sample frequency range state
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#if CFG_TUD_AUDIO_ENABLE_ENCODING
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// Audio test data, each buffer contains 2 channels, buffer[0] for CH0-1, buffer[1] for CH1-2
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uint16_t i2s_dummy_buffer[CFG_TUD_AUDIO_FUNC_1_N_TX_SUPP_SW_FIFO][CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX*CFG_TUD_AUDIO_FUNC_1_SAMPLE_RATE/1000/CFG_TUD_AUDIO_FUNC_1_N_TX_SUPP_SW_FIFO];
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#else
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// Audio test data, 4 channels muxed together, buffer[0] for CH0, buffer[1] for CH1, buffer[2] for CH2, buffer[3] for CH3
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uint16_t i2s_dummy_buffer[CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX*CFG_TUD_AUDIO_FUNC_1_SAMPLE_RATE/1000];
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#endif
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void led_blinking_task(void* param);
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void usb_device_task(void* param);
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void audio_task(void* param);
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/*------------- MAIN -------------*/
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int main(void)
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{
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board_init();
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// Init values
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sampFreq = AUDIO_SAMPLE_RATE;
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clkValid = 1;
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sampleFreqRng.wNumSubRanges = 1;
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sampleFreqRng.subrange[0].bMin = AUDIO_SAMPLE_RATE;
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sampleFreqRng.subrange[0].bMax = AUDIO_SAMPLE_RATE;
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sampleFreqRng.subrange[0].bRes = 0;
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// Generate dummy data
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#if CFG_TUD_AUDIO_ENABLE_ENCODING
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uint16_t * p_buff = i2s_dummy_buffer[0];
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uint16_t dataVal = 0;
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for (uint16_t cnt = 0; cnt < AUDIO_SAMPLE_RATE/1000; cnt++)
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{
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// CH0 saw wave
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*p_buff++ = dataVal;
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// CH1 inverted saw wave
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*p_buff++ = 3200 + AUDIO_SAMPLE_RATE/1000 - dataVal;
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dataVal+= 32;
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}
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p_buff = i2s_dummy_buffer[1];
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for (uint16_t cnt = 0; cnt < AUDIO_SAMPLE_RATE/1000; cnt++)
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{
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// CH3 square wave
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*p_buff++ = cnt < (AUDIO_SAMPLE_RATE/1000/2) ? 3400:5000;
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// CH4 sinus wave
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float t = 2*3.1415f * cnt / (AUDIO_SAMPLE_RATE/1000);
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*p_buff++ = (uint16_t)((int16_t)(sinf(t) * 750) + 6000);
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}
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#else
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uint16_t * p_buff = i2s_dummy_buffer;
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uint16_t dataVal = 0;
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for (uint16_t cnt = 0; cnt < AUDIO_SAMPLE_RATE/1000; cnt++)
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{
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// CH0 saw wave
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*p_buff++ = dataVal;
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// CH1 inverted saw wave
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*p_buff++ = 3200 + AUDIO_SAMPLE_RATE/1000 - dataVal;
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dataVal+= 32;
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// CH3 square wave
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*p_buff++ = cnt < (AUDIO_SAMPLE_RATE/1000/2) ? 3400:5000;
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// CH4 sinus wave
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float t = 2*3.1415f * cnt / (AUDIO_SAMPLE_RATE/1000);
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*p_buff++ = (uint16_t)((int16_t)(sinf(t) * 750) + 6000);
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}
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#endif
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#if configSUPPORT_STATIC_ALLOCATION
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// blinky task
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xTaskCreateStatic(led_blinking_task, "blinky", BLINKY_STACK_SIZE, NULL, 1, blinky_stack, &blinky_taskdef);
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// Create a task for tinyusb device stack
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xTaskCreateStatic(usb_device_task, "usbd", USBD_STACK_SIZE, NULL, configMAX_PRIORITIES-1, usb_device_stack, &usb_device_taskdef);
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// Create a task for audio
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xTaskCreateStatic(audio_task, "audio", AUDIO_STACK_SIZE, NULL, configMAX_PRIORITIES-1, audio_stack, &audio_taskdef);
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#else
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xTaskCreate(led_blinking_task, "blinky", BLINKY_STACK_SIZE, NULL, 1, NULL);
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xTaskCreate(usb_device_task, "usbd", USBD_STACK_SIZE, NULL, configMAX_PRIORITIES - 1, NULL);
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xTaskCreate(audio_task, "audio", AUDIO_STACK_SIZE, NULL, configMAX_PRIORITIES - 1, NULL);
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#endif
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// skip starting scheduler (and return) for ESP32-S2 or ESP32-S3
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#if !TUSB_MCU_VENDOR_ESPRESSIF
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vTaskStartScheduler();
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#endif
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return 0;
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}
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#if TUSB_MCU_VENDOR_ESPRESSIF
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void app_main(void)
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{
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main();
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}
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#endif
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// USB Device Driver task
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// This top level thread process all usb events and invoke callbacks
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void usb_device_task(void* param)
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{
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(void) param;
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// init device stack on configured roothub port
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// This should be called after scheduler/kernel is started.
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// Otherwise it could cause kernel issue since USB IRQ handler does use RTOS queue API.
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tusb_rhport_init_t dev_init = {
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.role = TUSB_ROLE_DEVICE,
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.speed = TUSB_SPEED_AUTO
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};
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tusb_init(BOARD_TUD_RHPORT, &dev_init);
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if (board_init_after_tusb) {
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board_init_after_tusb();
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}
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// RTOS forever loop
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while (1)
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{
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// tinyusb device task
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tud_task();
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}
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}
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//--------------------------------------------------------------------+
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// Device callbacks
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//--------------------------------------------------------------------+
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// Invoked when device is mounted
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void tud_mount_cb(void)
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{
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blink_interval_ms = BLINK_MOUNTED;
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}
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// Invoked when device is unmounted
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void tud_umount_cb(void)
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{
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blink_interval_ms = BLINK_NOT_MOUNTED;
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}
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// Invoked when usb bus is suspended
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// remote_wakeup_en : if host allow us to perform remote wakeup
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// Within 7ms, device must draw an average of current less than 2.5 mA from bus
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void tud_suspend_cb(bool remote_wakeup_en)
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{
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(void) remote_wakeup_en;
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blink_interval_ms = BLINK_SUSPENDED;
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}
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// Invoked when usb bus is resumed
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void tud_resume_cb(void)
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{
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blink_interval_ms = tud_mounted() ? BLINK_MOUNTED : BLINK_NOT_MOUNTED;
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}
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//--------------------------------------------------------------------+
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// AUDIO Task
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//--------------------------------------------------------------------+
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void audio_task(void* param)
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{
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(void) param;
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// Yet to be filled - e.g. read audio from I2S buffer.
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// Here we simulate a I2S receive callback every 1ms.
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while (1) {
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vTaskDelay(1);
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#if CFG_TUD_AUDIO_ENABLE_ENCODING
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// Write I2S buffer into FIFO
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for (uint8_t cnt=0; cnt < 2; cnt++)
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{
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tud_audio_write_support_ff(cnt, i2s_dummy_buffer[cnt], AUDIO_SAMPLE_RATE/1000 * CFG_TUD_AUDIO_FUNC_1_N_BYTES_PER_SAMPLE_TX * CFG_TUD_AUDIO_FUNC_1_CHANNEL_PER_FIFO_TX);
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}
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#else
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tud_audio_write(i2s_dummy_buffer, AUDIO_SAMPLE_RATE/1000 * CFG_TUD_AUDIO_FUNC_1_N_BYTES_PER_SAMPLE_TX * CFG_TUD_AUDIO_FUNC_1_N_CHANNELS_TX);
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#endif
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}
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}
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//--------------------------------------------------------------------+
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// Application Callback API Implementations
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//--------------------------------------------------------------------+
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// Invoked when audio class specific set request received for an EP
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bool tud_audio_set_req_ep_cb(uint8_t rhport, tusb_control_request_t const * p_request, uint8_t *pBuff)
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{
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(void) rhport;
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(void) pBuff;
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// We do not support any set range requests here, only current value requests
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TU_VERIFY(p_request->bRequest == AUDIO_CS_REQ_CUR);
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// Page 91 in UAC2 specification
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uint8_t channelNum = TU_U16_LOW(p_request->wValue);
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uint8_t ctrlSel = TU_U16_HIGH(p_request->wValue);
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uint8_t ep = TU_U16_LOW(p_request->wIndex);
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(void) channelNum; (void) ctrlSel; (void) ep;
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return false; // Yet not implemented
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}
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// Invoked when audio class specific set request received for an interface
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bool tud_audio_set_req_itf_cb(uint8_t rhport, tusb_control_request_t const * p_request, uint8_t *pBuff)
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{
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(void) rhport;
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(void) pBuff;
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// We do not support any set range requests here, only current value requests
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TU_VERIFY(p_request->bRequest == AUDIO_CS_REQ_CUR);
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// Page 91 in UAC2 specification
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uint8_t channelNum = TU_U16_LOW(p_request->wValue);
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uint8_t ctrlSel = TU_U16_HIGH(p_request->wValue);
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uint8_t itf = TU_U16_LOW(p_request->wIndex);
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(void) channelNum; (void) ctrlSel; (void) itf;
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return false; // Yet not implemented
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}
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// Invoked when audio class specific set request received for an entity
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bool tud_audio_set_req_entity_cb(uint8_t rhport, tusb_control_request_t const * p_request, uint8_t *pBuff)
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{
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(void) rhport;
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// Page 91 in UAC2 specification
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uint8_t channelNum = TU_U16_LOW(p_request->wValue);
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uint8_t ctrlSel = TU_U16_HIGH(p_request->wValue);
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uint8_t itf = TU_U16_LOW(p_request->wIndex);
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uint8_t entityID = TU_U16_HIGH(p_request->wIndex);
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(void) itf;
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// We do not support any set range requests here, only current value requests
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TU_VERIFY(p_request->bRequest == AUDIO_CS_REQ_CUR);
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// If request is for our feature unit
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if ( entityID == 2 )
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{
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switch ( ctrlSel )
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{
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case AUDIO_FU_CTRL_MUTE:
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// Request uses format layout 1
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TU_VERIFY(p_request->wLength == sizeof(audio_control_cur_1_t));
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mute[channelNum] = ((audio_control_cur_1_t*) pBuff)->bCur;
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TU_LOG2(" Set Mute: %d of channel: %u\r\n", mute[channelNum], channelNum);
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return true;
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case AUDIO_FU_CTRL_VOLUME:
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// Request uses format layout 2
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TU_VERIFY(p_request->wLength == sizeof(audio_control_cur_2_t));
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volume[channelNum] = ((audio_control_cur_2_t*) pBuff)->bCur;
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TU_LOG2(" Set Volume: %d dB of channel: %u\r\n", volume[channelNum], channelNum);
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return true;
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// Unknown/Unsupported control
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default:
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TU_BREAKPOINT();
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return false;
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}
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}
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return false; // Yet not implemented
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}
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// Invoked when audio class specific get request received for an EP
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bool tud_audio_get_req_ep_cb(uint8_t rhport, tusb_control_request_t const * p_request)
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{
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(void) rhport;
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// Page 91 in UAC2 specification
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uint8_t channelNum = TU_U16_LOW(p_request->wValue);
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uint8_t ctrlSel = TU_U16_HIGH(p_request->wValue);
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uint8_t ep = TU_U16_LOW(p_request->wIndex);
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(void) channelNum; (void) ctrlSel; (void) ep;
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return false; // Yet not implemented
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}
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// Invoked when audio class specific get request received for an interface
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bool tud_audio_get_req_itf_cb(uint8_t rhport, tusb_control_request_t const * p_request)
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{
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(void) rhport;
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// Page 91 in UAC2 specification
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uint8_t channelNum = TU_U16_LOW(p_request->wValue);
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uint8_t ctrlSel = TU_U16_HIGH(p_request->wValue);
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uint8_t itf = TU_U16_LOW(p_request->wIndex);
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(void) channelNum; (void) ctrlSel; (void) itf;
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return false; // Yet not implemented
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}
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// Invoked when audio class specific get request received for an entity
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bool tud_audio_get_req_entity_cb(uint8_t rhport, tusb_control_request_t const * p_request)
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{
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(void) rhport;
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// Page 91 in UAC2 specification
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uint8_t channelNum = TU_U16_LOW(p_request->wValue);
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uint8_t ctrlSel = TU_U16_HIGH(p_request->wValue);
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// uint8_t itf = TU_U16_LOW(p_request->wIndex); // Since we have only one audio function implemented, we do not need the itf value
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uint8_t entityID = TU_U16_HIGH(p_request->wIndex);
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// Input terminal (Microphone input)
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if (entityID == 1)
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{
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switch ( ctrlSel )
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{
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case AUDIO_TE_CTRL_CONNECTOR:
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{
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// The terminal connector control only has a get request with only the CUR attribute.
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audio_desc_channel_cluster_t ret;
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// Those are dummy values for now
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ret.bNrChannels = 1;
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ret.bmChannelConfig = 0;
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ret.iChannelNames = 0;
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TU_LOG2(" Get terminal connector\r\n");
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return tud_audio_buffer_and_schedule_control_xfer(rhport, p_request, (void*) &ret, sizeof(ret));
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}
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break;
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// Unknown/Unsupported control selector
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default:
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TU_BREAKPOINT();
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return false;
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}
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}
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// Feature unit
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if (entityID == 2)
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{
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switch ( ctrlSel )
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{
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case AUDIO_FU_CTRL_MUTE:
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// Audio control mute cur parameter block consists of only one byte - we thus can send it right away
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// There does not exist a range parameter block for mute
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TU_LOG2(" Get Mute of channel: %u\r\n", channelNum);
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return tud_control_xfer(rhport, p_request, &mute[channelNum], 1);
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case AUDIO_FU_CTRL_VOLUME:
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switch ( p_request->bRequest )
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{
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case AUDIO_CS_REQ_CUR:
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TU_LOG2(" Get Volume of channel: %u\r\n", channelNum);
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return tud_control_xfer(rhport, p_request, &volume[channelNum], sizeof(volume[channelNum]));
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case AUDIO_CS_REQ_RANGE:
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TU_LOG2(" Get Volume range of channel: %u\r\n", channelNum);
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// Copy values - only for testing - better is version below
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audio_control_range_2_n_t(1)
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ret;
|
|
|
|
ret.wNumSubRanges = 1;
|
|
ret.subrange[0].bMin = -90; // -90 dB
|
|
ret.subrange[0].bMax = 90; // +90 dB
|
|
ret.subrange[0].bRes = 1; // 1 dB steps
|
|
|
|
return tud_audio_buffer_and_schedule_control_xfer(rhport, p_request, (void*) &ret, sizeof(ret));
|
|
|
|
// Unknown/Unsupported control
|
|
default:
|
|
TU_BREAKPOINT();
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
// Unknown/Unsupported control
|
|
default:
|
|
TU_BREAKPOINT();
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// Clock Source unit
|
|
if ( entityID == 4 )
|
|
{
|
|
switch ( ctrlSel )
|
|
{
|
|
case AUDIO_CS_CTRL_SAM_FREQ:
|
|
// channelNum is always zero in this case
|
|
switch ( p_request->bRequest )
|
|
{
|
|
case AUDIO_CS_REQ_CUR:
|
|
TU_LOG2(" Get Sample Freq.\r\n");
|
|
// Buffered control transfer is needed for IN flow control to work
|
|
return tud_audio_buffer_and_schedule_control_xfer(rhport, p_request, &sampFreq, sizeof(sampFreq));
|
|
|
|
case AUDIO_CS_REQ_RANGE:
|
|
TU_LOG2(" Get Sample Freq. range\r\n");
|
|
return tud_control_xfer(rhport, p_request, &sampleFreqRng, sizeof(sampleFreqRng));
|
|
|
|
// Unknown/Unsupported control
|
|
default:
|
|
TU_BREAKPOINT();
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
case AUDIO_CS_CTRL_CLK_VALID:
|
|
// Only cur attribute exists for this request
|
|
TU_LOG2(" Get Sample Freq. valid\r\n");
|
|
return tud_control_xfer(rhport, p_request, &clkValid, sizeof(clkValid));
|
|
|
|
// Unknown/Unsupported control
|
|
default:
|
|
TU_BREAKPOINT();
|
|
return false;
|
|
}
|
|
}
|
|
|
|
TU_LOG2(" Unsupported entity: %d\r\n", entityID);
|
|
return false; // Yet not implemented
|
|
}
|
|
|
|
bool tud_audio_tx_done_pre_load_cb(uint8_t rhport, uint8_t itf, uint8_t ep_in, uint8_t cur_alt_setting)
|
|
{
|
|
(void) rhport;
|
|
(void) itf;
|
|
(void) ep_in;
|
|
(void) cur_alt_setting;
|
|
|
|
|
|
// In read world application data flow is driven by I2S clock,
|
|
// both tud_audio_tx_done_pre_load_cb() & tud_audio_tx_done_post_load_cb() are hardly used.
|
|
// For example in your I2S receive callback:
|
|
// void I2S_Rx_Callback(int channel, const void* data, uint16_t samples)
|
|
// {
|
|
// tud_audio_write_support_ff(channel, data, samples * N_BYTES_PER_SAMPLE * N_CHANNEL_PER_FIFO);
|
|
// }
|
|
|
|
return true;
|
|
}
|
|
|
|
bool tud_audio_tx_done_post_load_cb(uint8_t rhport, uint16_t n_bytes_copied, uint8_t itf, uint8_t ep_in, uint8_t cur_alt_setting)
|
|
{
|
|
(void) rhport;
|
|
(void) n_bytes_copied;
|
|
(void) itf;
|
|
(void) ep_in;
|
|
(void) cur_alt_setting;
|
|
|
|
return true;
|
|
}
|
|
|
|
bool tud_audio_set_itf_close_EP_cb(uint8_t rhport, tusb_control_request_t const * p_request)
|
|
{
|
|
(void) rhport;
|
|
(void) p_request;
|
|
|
|
return true;
|
|
}
|
|
|
|
///--------------------------------------------------------------------+
|
|
// BLINKING TASK
|
|
//--------------------------------------------------------------------+
|
|
void led_blinking_task(void* param) {
|
|
(void) param;
|
|
static uint32_t start_ms = 0;
|
|
static bool led_state = false;
|
|
|
|
while (1) {
|
|
// Blink every interval ms
|
|
vTaskDelay(blink_interval_ms / portTICK_PERIOD_MS);
|
|
start_ms += blink_interval_ms;
|
|
|
|
board_led_write(led_state);
|
|
led_state = 1 - led_state; // toggle
|
|
}
|
|
}
|