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Removed sources of old audio stream drivers, updated stub audio driver

pull/180/head
Silvano Seva 2023-08-27 14:01:30 +02:00
rodzic cd936ea216
commit 8dc1cba1f7
9 zmienionych plików z 13 dodań i 1898 usunięć
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55
platform/drivers/audio/inputStream_GDx.c
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/***************************************************************************
* Copyright (C) 2021 - 2023 by Federico Amedeo Izzo IU2NUO, *
* Niccolò Izzo IU2KIN *
* Frederik Saraci IU2NRO *
* Silvano Seva IU2KWO *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 3 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, see <http://www.gnu.org/licenses/> *
***************************************************************************/
#include <audio_stream.h>
#include <hwconfig.h>
#include <stddef.h>
streamId inputStream_start(const enum AudioSource source,
const enum AudioPriority prio,
stream_sample_t * const buf,
const size_t bufLength,
const enum BufMode mode,
const uint32_t sampleRate)
{
(void) source;
(void) prio;
(void) buf;
(void) bufLength;
(void) mode;
(void) sampleRate;
return -1;
}
dataBlock_t inputStream_getData(streamId id)
{
(void) id;
dataBlock_t block;
block.data = NULL;
block.len = 0;
return block;
}
void inputStream_stop(streamId id)
{
(void) id;
}

292
platform/drivers/audio/inputStream_MDx.cpp
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/***************************************************************************
* Copyright (C) 2021 - 2023 by Federico Amedeo Izzo IU2NUO, *
* Niccolò Izzo IU2KIN *
* Frederik Saraci IU2NRO *
* Silvano Seva IU2KWO *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 3 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, see <http://www.gnu.org/licenses/> *
***************************************************************************/
#include <kernel/scheduler/scheduler.h>
#include <audio_stream.h>
#include <toneGenerator_MDx.h>
#include <peripherals/gpio.h>
#include <hwconfig.h>
#include <stdbool.h>
#include <miosix.h>
#include <timers.h>
using namespace miosix;
static bool inUse = false; // Flag to determine if the input stream is already open.
static Thread *sWaiting = 0; // Thread waiting on interrupt.
static stream_sample_t *bufAddr = 0; // Start address of data buffer, fixed.
static stream_sample_t *bufCurr = 0; // Buffer address to be returned to application.
static size_t bufLen = 0; // Buffer length.
static uint8_t bufMode = BUF_LINEAR; // Buffer management mode.
void __attribute__((used)) DmaHandlerImpl()
{
if(DMA2->LISR & (DMA_LISR_TCIF2 | DMA_LISR_HTIF2))
{
switch(bufMode)
{
case BUF_LINEAR:
// Finish, stop DMA and ADC
DMA2_Stream2->CR &= ~DMA_SxCR_EN;
ADC2->CR2 &= ~ADC_CR2_ADON;
break;
case BUF_CIRC_DOUBLE:
// Return half of the buffer but do not stop the DMA
if(DMA2->LISR & DMA_LISR_HTIF2)
bufCurr = bufAddr; // Return first half
else
bufCurr = bufAddr + (bufLen / 2); // Return second half
break;
default:
break;
}
// Wake up the thread
if(sWaiting != 0)
{
sWaiting->IRQwakeup();
Priority prio = sWaiting->IRQgetPriority();
if(prio > Thread::IRQgetCurrentThread()->IRQgetPriority())
Scheduler::IRQfindNextThread();
sWaiting = 0;
}
}
DMA2->LIFCR |= DMA_LIFCR_CTEIF2 // Clear transfer error flag (not handled)
| DMA_LIFCR_CHTIF2 // Clear half transfer flag
| DMA_LIFCR_CTCIF2; // Clear transfer completed flag
}
void __attribute__((naked)) DMA2_Stream2_IRQHandler()
{
saveContext();
asm volatile("bl _Z14DmaHandlerImplv");
restoreContext();
}
streamId inputStream_start(const enum AudioSource source,
const enum AudioPriority prio,
stream_sample_t * const buf,
const size_t bufLength,
const enum BufMode mode,
const uint32_t sampleRate)
{
(void) prio; // TODO: input stream does not have priority
// Check if buffer is in CCM area or not, since DMA cannot access CCM RAM
if(reinterpret_cast< uint32_t >(buf) < 0x20000000) return -1;
/*
* Critical section for inUse flag management, makes the code below
* thread-safe.
*/
{
FastInterruptDisableLock dLock;
if(inUse) return -1;
inUse = true;
}
bufMode = mode;
bufAddr = buf;
bufLen = bufLength;
RCC->APB2ENR |= RCC_APB2ENR_ADC2EN; // Enable ADC
RCC->APB1ENR |= RCC_APB1ENR_TIM2EN; // Enable conv. timebase timer
RCC->AHB1ENR |= RCC_AHB1ENR_DMA2EN; // Enable DMA
__DSB();
/*
* TIM2 for conversion triggering via TIM2_TRGO, that is counter reload.
* AP1 frequency is 42MHz but timer runs at 84MHz, tick rate is 1MHz,
* reload register is configured based on desired sample rate.
*/
tim_setUpdateFreqency(TIM2, sampleRate, 84000000);
TIM2->CNT = 0;
TIM2->EGR = TIM_EGR_UG;
TIM2->CR2 = TIM_CR2_MMS_1;
TIM2->CR1 = TIM_CR1_CEN;
/* DMA2 Stream 2 common configuration:
* - channel 1: ADC2
* - high priority
* - half-word transfer, both memory and peripheral
* - increment memory
* - peripheral-to-memory transfer
*/
DMA2_Stream2->PAR = reinterpret_cast< uint32_t >(&(ADC2->DR));
DMA2_Stream2->M0AR = reinterpret_cast< uint32_t >(buf);
DMA2_Stream2->NDTR = bufLength;
DMA2_Stream2->CR = DMA_SxCR_CHSEL_0 // Channel 1
| DMA_SxCR_MSIZE_0 // Memory size: 16 bit
| DMA_SxCR_PSIZE_0 // Peripheral size: 16 bit
| DMA_SxCR_PL_1 // High priority
| DMA_SxCR_MINC; // Increment memory
/*
* Configure DMA and memory pointers according to buffer management mode.
* In linear and circular mode all the buffer is returned, in double circular
* buffer mode the buffer pointer is managed inside the DMA ISR.
*/
switch(mode)
{
case BUF_LINEAR:
DMA2_Stream2->CR |= DMA_SxCR_TCIE; // Interrupt on transfer end
bufCurr = bufAddr; // Return all the buffer
break;
case BUF_CIRC_DOUBLE:
DMA2_Stream2->CR |= DMA_SxCR_CIRC // Circular mode
| DMA_SxCR_HTIE // Interrupt on half transfer
| DMA_SxCR_TCIE; // Interrupt on transfer end
break;
default:
inUse = false; // Invalid setting, release flag and return error.
return -1;
break;
}
// Configure NVIC interrupt
NVIC_ClearPendingIRQ(DMA2_Stream2_IRQn);
NVIC_SetPriority(DMA2_Stream2_IRQn, 10);
NVIC_EnableIRQ(DMA2_Stream2_IRQn);
/*
* ADC2 configuration.
*
* ADC clock is APB2 frequency divided by 4, giving 21MHz.
* Channel sample time set to 84 cycles, total conversion time is 100
* cycles: this leads to a maximum sampling frequency of 210kHz.
* Convert one channel only, no overrun interrupt, 12-bit resolution,
* no analog watchdog, discontinuous mode, no end of conversion interrupts.
*/
ADC->CCR |= ADC_CCR_ADCPRE_0;
ADC2->SMPR2 = ADC_SMPR2_SMP2_2
| ADC_SMPR2_SMP1_2;
ADC2->SQR1 = 0; // Convert one channel
ADC2->CR1 |= ADC_CR1_DISCEN;
ADC2->CR2 |= ADC_CR2_EXTEN_0 // Trigger on rising edge
| ADC_CR2_EXTSEL_1
| ADC_CR2_EXTSEL_2 // 0b0110 TIM2_TRGO trig. source
| ADC_CR2_DDS // Enable DMA data transfer
| ADC_CR2_DMA;
/*
* Select ADC channel according to signal source:
* - CH3, mic input on PA3 (vox level)
* - CH13, audio from RTX on PC13
*/
switch(source)
{
case SOURCE_MIC:
gpio_setMode(GPIOA, 3, INPUT_ANALOG);
ADC2->SQR3 = 3;
break;
case SOURCE_RTX:
gpio_setMode(GPIOC, 3, INPUT_ANALOG);
ADC2->SQR3 = 13;
break;
default:
inUse = false; // Unsupported source, release flag and return error.
return -1;
break;
}
if(mode == BUF_CIRC_DOUBLE)
{
DMA2_Stream2->CR |= DMA_SxCR_EN; // Enable DMA
ADC2->CR2 |= ADC_CR2_ADON; // Enable ADC
}
return 0;
}
dataBlock_t inputStream_getData(streamId id)
{
dataBlock_t block;
block.data = NULL;
block.len = 0;
// Invalid stream ID, return an empty data block
if(id < 0) return block;
if(bufMode == BUF_LINEAR)
{
// Reload DMA configuration then start DMA and ADC, stopped in ISR
DMA2_Stream2->PAR = reinterpret_cast< uint32_t >(&(ADC2->DR));
DMA2_Stream2->M0AR = reinterpret_cast< uint32_t >(bufAddr);
DMA2_Stream2->NDTR = bufLen;
DMA2_Stream2->CR |= DMA_SxCR_EN;
ADC2->CR2 |= ADC_CR2_ADON;
}
/*
* Put the calling thread in waiting status until data is ready.
*/
{
FastInterruptDisableLock dLock;
sWaiting = Thread::IRQgetCurrentThread();
do
{
Thread::IRQwait();
{
FastInterruptEnableLock eLock(dLock);
Thread::yield();
}
}while(sWaiting);
}
block.data = bufCurr;
block.len = bufLen;
if(bufMode == BUF_CIRC_DOUBLE) block.len /= 2;
return block;
}
void inputStream_stop(streamId id)
{
if(id < 0) return;
TIM2->CR1 &= ~TIM_CR1_CEN; // Shut down timebase
ADC2->CR2 &= ~ADC_CR2_ADON; // Shut down ADC
DMA2_Stream2->CR &= ~DMA_SxCR_EN; // Shut down DMA transfer
RCC->APB2ENR &= ~RCC_APB2ENR_ADC2EN; // Disable ADC
RCC->APB1ENR &= ~RCC_APB1ENR_TIM2EN; // Disable conv. timebase timer
__DSB();
// Critical section: release inUse flag, invalidate (partial) data, wake up
// thread.
{
FastInterruptDisableLock dLock;
inUse = false;
bufCurr = 0;
bufLen = 0;
if(sWaiting != 0) sWaiting->IRQwakeup();
}
}

290
platform/drivers/audio/inputStream_Mod17.cpp
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/***************************************************************************
* Copyright (C) 2021 - 2023 by Federico Amedeo Izzo IU2NUO, *
* Niccolò Izzo IU2KIN *
* Frederik Saraci IU2NRO *
* Silvano Seva IU2KWO *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 3 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, see <http://www.gnu.org/licenses/> *
***************************************************************************/
#include <kernel/scheduler/scheduler.h>
#include <audio_stream.h>
#include <toneGenerator_MDx.h>
#include <peripherals/gpio.h>
#include <hwconfig.h>
#include <stdbool.h>
#include <miosix.h>
#include <timers.h>
using namespace miosix;
static bool inUse = false; // Flag to determine if the input stream is already open.
static Thread *sWaiting = 0; // Thread waiting on interrupt.
static stream_sample_t *bufAddr = 0; // Start address of data buffer, fixed.
static stream_sample_t *bufCurr = 0; // Buffer address to be returned to application.
static size_t bufLen = 0; // Buffer length.
static uint8_t bufMode = BUF_LINEAR; // Buffer management mode.
void __attribute__((used)) DmaHandlerImpl()
{
if(DMA2->LISR & (DMA_LISR_TCIF2 | DMA_LISR_HTIF2))
{
switch(bufMode)
{
case BUF_LINEAR:
// Finish, stop DMA and ADC
DMA2_Stream2->CR &= ~DMA_SxCR_EN;
ADC2->CR2 &= ~ADC_CR2_ADON;
break;
case BUF_CIRC_DOUBLE:
// Return half of the buffer but do not stop the DMA
if(DMA2->LISR & DMA_LISR_HTIF2)
bufCurr = bufAddr; // Return first half
else
bufCurr = bufAddr + (bufLen / 2); // Return second half
break;
default:
break;
}
// Wake up the thread
if(sWaiting != 0)
{
sWaiting->IRQwakeup();
Priority prio = sWaiting->IRQgetPriority();
if(prio > Thread::IRQgetCurrentThread()->IRQgetPriority())
Scheduler::IRQfindNextThread();
sWaiting = 0;
}
}
DMA2->LIFCR |= DMA_LIFCR_CTEIF2 // Clear transfer error flag (not handled)
| DMA_LIFCR_CHTIF2 // Clear half transfer flag
| DMA_LIFCR_CTCIF2; // Clear transfer completed flag
}
void __attribute__((naked)) DMA2_Stream2_IRQHandler()
{
saveContext();
asm volatile("bl _Z14DmaHandlerImplv");
restoreContext();
}
streamId inputStream_start(const enum AudioSource source,
const enum AudioPriority prio,
stream_sample_t * const buf,
const size_t bufLength,
const enum BufMode mode,
const uint32_t sampleRate)
{
(void) prio; // TODO: input stream does not have priority
// Check if buffer is in CCM area or not, since DMA cannot access CCM RAM
if(reinterpret_cast< uint32_t >(buf) < 0x20000000) return -1;
/*
* Critical section for inUse flag management, makes the code below
* thread-safe.
*/
{
FastInterruptDisableLock dLock;
if(inUse) return -1;
inUse = true;
}
bufMode = mode;
bufAddr = buf;
bufLen = bufLength;
RCC->APB2ENR |= RCC_APB2ENR_ADC2EN; // Enable ADC
RCC->APB1ENR |= RCC_APB1ENR_TIM2EN; // Enable conv. timebase timer
RCC->AHB1ENR |= RCC_AHB1ENR_DMA2EN; // Enable DMA
__DSB();
/*
* TIM2 for conversion triggering via TIM2_TRGO, that is counter reload.
* AP1 frequency is 42MHz but timer runs at 84MHz, tick rate is 1MHz,
* reload register is configured based on desired sample rate.
*/
tim_setUpdateFreqency(TIM2, sampleRate, 84000000);
TIM2->CNT = 0;
TIM2->EGR = TIM_EGR_UG;
TIM2->CR2 = TIM_CR2_MMS_1;
TIM2->CR1 = TIM_CR1_CEN;
/* DMA2 Stream 2 common configuration:
* - channel 1: ADC2
* - high priority
* - half-word transfer, both memory and peripheral
* - increment memory
* - peripheral-to-memory transfer
*/
DMA2_Stream2->PAR = reinterpret_cast< uint32_t >(&(ADC2->DR));
DMA2_Stream2->M0AR = reinterpret_cast< uint32_t >(buf);
DMA2_Stream2->NDTR = bufLength;
DMA2_Stream2->CR = DMA_SxCR_CHSEL_0 // Channel 1
| DMA_SxCR_MSIZE_0 // Memory size: 16 bit
| DMA_SxCR_PSIZE_0 // Peripheral size: 16 bit
| DMA_SxCR_PL_1 // High priority
| DMA_SxCR_MINC; // Increment memory
/*
* Configure DMA and memory pointers according to buffer management mode.
* In linear and circular mode all the buffer is returned, in double circular
* buffer mode the buffer pointer is managed inside the DMA ISR.
*/
switch(mode)
{
case BUF_LINEAR:
DMA2_Stream2->CR |= DMA_SxCR_TCIE; // Interrupt on transfer end
bufCurr = bufAddr; // Return all the buffer
break;
case BUF_CIRC_DOUBLE:
DMA2_Stream2->CR |= DMA_SxCR_CIRC // Circular mode
| DMA_SxCR_HTIE // Interrupt on half transfer
| DMA_SxCR_TCIE; // Interrupt on transfer end
break;
default:
inUse = false; // Invalid setting, release flag and return error.
return -1;
break;
}
// Configure NVIC interrupt
NVIC_ClearPendingIRQ(DMA2_Stream2_IRQn);
NVIC_SetPriority(DMA2_Stream2_IRQn, 10);
NVIC_EnableIRQ(DMA2_Stream2_IRQn);
/*
* ADC2 configuration.
*
* ADC clock is APB2 frequency divided by 4, giving 21MHz.
* Channel sample time set to 84 cycles, total conversion time is 100
* cycles: this leads to a maximum sampling frequency of 210kHz.
* Convert one channel only, no overrun interrupt, 12-bit resolution,
* no analog watchdog, discontinuous mode, no end of conversion interrupts.
*/
ADC->CCR |= ADC_CCR_ADCPRE_0;
ADC2->SMPR2 = ADC_SMPR2_SMP2_2
| ADC_SMPR2_SMP1_2;
ADC2->SQR1 = 0; // Convert one channel
ADC2->CR1 |= ADC_CR1_DISCEN;
ADC2->CR2 |= ADC_CR2_EXTEN_0 // Trigger on rising edge
| ADC_CR2_EXTSEL_1
| ADC_CR2_EXTSEL_2 // 0b0110 TIM2_TRGO trig. source
| ADC_CR2_DDS // Enable DMA data transfer
| ADC_CR2_DMA;
/*
* Select ADC channel according to signal source:
* - CH1, audio from RTX on PA1
* - CH2, audio from microphone on PA2
*/
switch(source)
{
case SOURCE_MIC:
gpio_setMode(AUDIO_MIC, INPUT_ANALOG);
ADC2->SQR3 = 2;
break;
case SOURCE_RTX:
gpio_setMode(BASEBAND_RX, INPUT_ANALOG);
ADC2->SQR3 = 1;
break;
default:
inUse = false; // Unsupported source, release flag and return error.
return -1;
break;
}
if(mode == BUF_CIRC_DOUBLE)
{
DMA2_Stream2->CR |= DMA_SxCR_EN; // Enable DMA
ADC2->CR2 |= ADC_CR2_ADON; // Enable ADC
}
return 0;
}
dataBlock_t inputStream_getData(streamId id)
{
dataBlock_t block;
block.data = NULL;
block.len = 0;
// Invalid stream ID, return an empty data block
if(id < 0) return block;
if(bufMode == BUF_LINEAR)
{
// Reload DMA configuration then start DMA and ADC, stopped in ISR
DMA2_Stream2->PAR = reinterpret_cast< uint32_t >(&(ADC2->DR));
DMA2_Stream2->M0AR = reinterpret_cast< uint32_t >(bufAddr);
DMA2_Stream2->NDTR = bufLen;
DMA2_Stream2->CR |= DMA_SxCR_EN;
ADC2->CR2 |= ADC_CR2_ADON;
}
/*
* Put the calling thread in waiting status until data is ready.
*/
{
FastInterruptDisableLock dLock;
sWaiting = Thread::IRQgetCurrentThread();
do
{
Thread::IRQwait();
{
FastInterruptEnableLock eLock(dLock);
Thread::yield();
}
}while((sWaiting != 0) && (inUse == true));
}
block.data = bufCurr;
block.len = bufLen;
if(bufMode == BUF_CIRC_DOUBLE) block.len /= 2;
return block;
}
void inputStream_stop(streamId id)
{
if(id < 0) return;
TIM2->CR1 = 0; // Shut down timebase
ADC2->CR2 = 0; // Shut down ADC
DMA2_Stream2->CR = 0; // Shut down DMA transfer
RCC->APB2ENR &= ~RCC_APB2ENR_ADC2EN; // Disable ADC
RCC->APB1ENR &= ~RCC_APB1ENR_TIM2EN; // Disable conv. timebase timer
RCC->AHB1ENR &= ~RCC_AHB1ENR_DMA2EN; // Disable DMA
__DSB();
// Critical section: release inUse flag and invalidate (partial) data.
// Releasing the "inUse" flag cause the wake up of pending threads.
FastInterruptDisableLock dLock;
bufCurr = 0;
bufLen = 0;
inUse = false;
}

366
platform/drivers/audio/inputStream_linux.cpp
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/***************************************************************************
* Copyright (C) 2022 - 2023 by Alain Carlucci *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 3 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, see <http://www.gnu.org/licenses/> *
***************************************************************************/
#include <hwconfig.h>
#include <audio_stream.h>
#include <stddef.h>
#include <atomic>
#include <cassert>
#include <chrono>
#include <cstdio>
#include <functional>
#include <map>
#include <memory>
#include <string>
#include <thread>
streamId gNextAvailableStreamId = 0;
class InputStream
{
public:
InputStream(enum AudioSource source,
enum AudioPriority priority,
stream_sample_t* buf,
size_t bufLength,
enum BufMode mode,
uint32_t sampleRate)
: m_run_thread(true), m_func_running(false)
{
if (bufLength % 2)
{
fprintf(stderr, "InputStream error: invalid bufLength %lu\n",
bufLength);
return;
}
m_db_ready[0] = m_db_ready[1] = false;
std::string sourceString;
switch (source)
{
case SOURCE_MIC:
sourceString = "MIC";
break;
case SOURCE_MCU:
sourceString = "MCU";
break;
case SOURCE_RTX:
sourceString = "RTX";
break;
default:
break;
}
m_fp = fopen((sourceString + ".raw").c_str(), "rb");
if (!m_fp)
{
fprintf(stderr, "InputStream error: cannot open: %s.raw\n",
sourceString.c_str());
return;
}
fseek(m_fp, 0, SEEK_END);
m_size = ftell(m_fp);
fseek(m_fp, 0, SEEK_SET);
if (m_size % 2 || m_size == 0)
{
fprintf(stderr, "InputStream error: invalid file: %s.raw\n",
sourceString.c_str());
return;
}
m_valid = true;
changeId();
setStreamData(priority, buf, bufLength, mode, sampleRate);
}
bool isValid() const
{
return m_valid;
}
~InputStream()
{
stopThread();
if (m_fp) fclose(m_fp);
}
dataBlock_t getDataBlock()
{
if (!m_valid) return {nullptr, 0};
switch (m_mode)
{
case BufMode::BUF_LINEAR:
{
// With this mode, just sleep for the right amount of time
// and return the buffer content
if (!fillBuffer(m_buf, m_bufLength)) return {NULL, 0};
return {m_buf, m_bufLength};
}
case BufMode::BUF_CIRC_DOUBLE:
{
// If this mode is selected, wait for the readiness of the
// current slice and return it
int id = m_db_curread;
// Wait for `m_buf` to be ready
while (!m_db_ready[id] && m_run_thread)
{
std::this_thread::sleep_for(std::chrono::milliseconds(1));
}
if (!m_run_thread) return {NULL, 0};
// Return the buffer contents
auto* pos = m_buf + id * (m_bufLength / 2);
m_db_ready[id] = 0;
// Update the read buffer
m_db_curread = (id + 1) % 2;
return {pos, m_bufLength / 2};
}
default:
return {NULL, 0};
}
}
AudioPriority priority() const
{
return m_prio;
}
streamId id() const
{
return m_id;
}
void changeId()
{
m_id = gNextAvailableStreamId;
gNextAvailableStreamId += 1;
}
void setStreamData(AudioPriority priority,
stream_sample_t* buf,
size_t bufLength,
BufMode mode,
uint32_t sampleRate)
{
if (!m_valid) return;
stopThread();
m_run_thread = true; // set it as runnable again
// HERE stop thread
m_prio = priority;
m_buf = buf;
m_bufLength = bufLength;
m_mode = mode;
m_sampleRate = sampleRate;
switch (m_mode)
{
case BufMode::BUF_LINEAR:
// TODO: stop a running thread
break;
case BufMode::BUF_CIRC_DOUBLE:
m_thread =
std::thread(std::bind(&InputStream::threadFunc, this));
// TODO: start thread
break;
}
}
private:
bool m_valid = false;
FILE* m_fp = nullptr;
uint64_t m_size = 0;
streamId m_id;
AudioPriority m_prio;
BufMode m_mode;
uint32_t m_sampleRate = 0;
stream_sample_t* m_buf = nullptr;
size_t m_bufLength = 0;
size_t m_db_curwrite = 0;
size_t m_db_curread = 0;
std::atomic<bool> m_db_ready[2];
std::atomic<bool> m_run_thread;
std::atomic<bool> m_func_running;
std::thread m_thread;
// Emulate an ADC that reads to the circular buffer
void threadFunc()
{
m_db_ready[0] = m_db_ready[1] = false;
while (m_run_thread)
{
m_db_ready[0] = false;
m_db_curwrite = 0;
fillBuffer(m_buf, m_bufLength / 2);
m_db_ready[0] = true;
if (!m_run_thread) break;
m_db_curwrite = 1;
m_db_ready[1] = false;
fillBuffer(m_buf + m_bufLength / 2, m_bufLength / 2);
m_db_ready[1] = true;
}
}
// This is a blocking function that emulates an ADC writing to the
// specified memory region. It takes the same time that an ADC would take
// to sample the same quantity of data.
bool fillBuffer(stream_sample_t* dest, size_t sz)
{
size_t i = 0;
if (!m_run_thread) return false;
assert(m_func_running == false);
m_func_running = true;
auto reset_func_running = [&]()
{
assert(m_func_running == true);
m_func_running = false;
};
using std::chrono::microseconds;
if (m_sampleRate > 0)
{
// Do a piecewise-sleep so that it's easily interruptible
uint64_t microsec = sz * 1000000 / m_sampleRate;
while (microsec > 10000)
{
if (!m_run_thread)
{
// Early exit if the class is being deallocated
reset_func_running();
return false;
}
std::this_thread::sleep_for(microseconds(10000));
microsec -= 10000;
}
std::this_thread::sleep_for(microseconds(microsec));
}
if (!m_run_thread)
{
// Early exit if the class is being deallocated
reset_func_running();
return false;
}
// Fill the buffer
while (i < sz)
{
auto n = fread(dest + i, 2, sz - i, m_fp);
if (n < (sz - i)) fseek(m_fp, 0, SEEK_SET);
i += n;
}
assert(i == sz);
reset_func_running();
return true;
}
void stopThread()
{
m_run_thread = false;
while (m_func_running)
std::this_thread::sleep_for(std::chrono::milliseconds(1));
if (m_thread.joinable()) m_thread.join();
}
};
std::map<AudioSource, std::unique_ptr<InputStream>> gOpenStreams;
streamId inputStream_start(const enum AudioSource source,
const enum AudioPriority priority,
stream_sample_t* const buf,
const size_t bufLength,
const enum BufMode mode,
const uint32_t sampleRate)
{
auto it = gOpenStreams.find(source);
if (it != gOpenStreams.end())
{
auto& inputStream = it->second;
if (inputStream->priority() >= priority) return -1;
inputStream->changeId();
inputStream->setStreamData(priority, buf, bufLength, mode, sampleRate);
return inputStream->id();
}
auto stream = std::make_unique<InputStream>(source, priority, buf,
bufLength, mode, sampleRate);
if (!stream->isValid()) return -1;
const auto id = stream->id();
// New stream, move it into the map
gOpenStreams[source] = std::move(stream);
return id;
}
dataBlock_t inputStream_getData(streamId id)
{
InputStream* stream = nullptr;
for (auto& i : gOpenStreams)
if (i.second->id() == id)
{
stream = i.second.get();
break;
}
if (stream == nullptr) return dataBlock_t{NULL, 0};
return stream->getDataBlock();
}
void inputStream_stop(streamId id)
{
AudioSource src;
bool found = false;
for (auto& i : gOpenStreams)
if (i.second->id() == id)
{
found = true;
src = i.first;
break;
}
if (!found) return;
gOpenStreams.erase(src);
}

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platform/drivers/audio/outputStream_GDx.c
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/***************************************************************************
* Copyright (C) 2021 - 2023 by Federico Amedeo Izzo IU2NUO, *
* Niccolò Izzo IU2KIN *
* Frederik Saraci IU2NRO *
* Silvano Seva IU2KWO *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 3 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, see <http://www.gnu.org/licenses/> *
***************************************************************************/
#include <audio_stream.h>
streamId outputStream_start(const enum AudioSink destination,
const enum AudioPriority prio,
stream_sample_t * const buf,
const size_t length,
const enum BufMode mode,
const uint32_t sampleRate)
{
(void) destination;
(void) prio;
(void) buf;
(void) length;
(void) mode;
(void) sampleRate;
return -1;
}
stream_sample_t *outputStream_getIdleBuffer(const streamId id)
{
(void) id;
return NULL;
}
bool outputStream_sync(const streamId id, const bool bufChanged)
{
(void) id;
(void) bufChanged;
return false;
}
void outputStream_stop(const streamId id)
{
(void) id;
}
void outputStream_terminate(const streamId id)
{
(void) id;
}

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platform/drivers/audio/outputStream_MDx.cpp
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/***************************************************************************
* Copyright (C) 2022 - 2023 by Federico Amedeo Izzo IU2NUO, *
* Niccolò Izzo IU2KIN *
* Frederik Saraci IU2NRO *
* Silvano Seva IU2KWO *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 3 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, see <http://www.gnu.org/licenses/> *
***************************************************************************/
#include <kernel/scheduler/scheduler.h>
#include <audio_stream.h>
#include <toneGenerator_MDx.h>
#include <data_conversion.h>
#include <timers.h>
#include <miosix.h>
static int priority = PRIO_BEEP;
static bool running = false; // Stream is running
static bool circularMode = false; // Circular mode enabled
static bool reqFinish = false; // Pending termination request
static size_t bufLen = 0; // Buffer length
static stream_sample_t *bufAddr = 0; // Start address of data buffer, fixed.
static stream_sample_t *idleBuf = 0;
using namespace miosix;
static Thread *dmaWaiting = 0;
/**
* \internal
* Stop an ongoing transfer, deactivating timers and DMA stream.
*/
static inline void stopTransfer()
{
TIM7->CR1 = 0; // Stop TIM7
DMA1_Stream2->CR &= ~DMA_SxCR_EN; // Stop DMA transfer
TIM3->CCER &= ~TIM_CCER_CC3E; // Turn off compare channel
RCC->APB1ENR &= ~RCC_APB1ENR_TIM7EN; // Turn off TIM7 APB clock
__DSB();
// Re-activate "beeps"
toneGen_unlockBeep();
// Finally, clear flags and restore priority level
running = false;
reqFinish = false;
circularMode = false;
priority = PRIO_BEEP;
}
/**
* \internal
* Actual implementation of DMA1 Stream2 interrupt handler.
*/
void __attribute__((used)) DMA_Handler()
{
if(DMA1->LISR & DMA_LISR_HTIF2)
idleBuf = bufAddr;
else
idleBuf = bufAddr + (bufLen / 2);
// Stop transfer for linear buffer mode or pending termination request.
if((circularMode == false) || (reqFinish == true))
{
stopTransfer();
}
// Clear interrupt flags
DMA1->LIFCR = DMA_LIFCR_CTCIF2
| DMA_LIFCR_CHTIF2
| DMA_LIFCR_CTEIF2;
// Finally, wake up eventual pending threads
if(dmaWaiting == 0) return;
dmaWaiting->IRQwakeup();
if(dmaWaiting->IRQgetPriority()>Thread::IRQgetCurrentThread()->IRQgetPriority())
Scheduler::IRQfindNextThread();
dmaWaiting = 0;
}
void __attribute__((naked)) DMA1_Stream2_IRQHandler()
{
saveContext();
asm volatile("bl _Z11DMA_Handlerv");
restoreContext();
}
streamId outputStream_start(const enum AudioSink destination,
const enum AudioPriority prio,
stream_sample_t * const buf,
const size_t length,
const enum BufMode mode,
const uint32_t sampleRate)
{
// Sanity check
if((buf == NULL) || (length == 0) || (sampleRate == 0)) return -1;
// This device cannot sink to buffers
if(destination == SINK_MCU) return -1;
// Check if an output stream is already opened and, in case, handle priority.
if(running)
{
if(prio < priority) return -1; // Lower priority, reject.
if(prio > priority) stopTransfer(); // Higher priority, takes over.
while(running) ; // Same priority, wait.
}
// Thread-safe block: assign priority, set stream as running and lock "beeps"
__disable_irq();
priority = prio;
running = true;
toneGen_lockBeep();
__enable_irq();
/*
* Convert buffer elements from int16_t to unsigned 8 bit values, as
* required by tone generator. Processing can be done in-place because the
* API mandates that the function caller does not modify the buffer content
* once this function has been called.
*/
S16toU8(buf, length);
bufAddr = buf;
bufLen = length;
idleBuf = bufAddr + (bufLen / 2);
RCC->AHB1ENR |= RCC_AHB1ENR_DMA1EN;
RCC->APB1ENR |= RCC_APB1ENR_TIM7EN;
__DSB();
/*
* Timebase for triggering of DMA transfers.
* Bus frequency for TIM7 is 84MHz.
*/
tim_setUpdateFreqency(TIM7, sampleRate, 84000000);
TIM7->CNT = 0;
TIM7->EGR = TIM_EGR_UG;
TIM7->DIER = TIM_DIER_UDE;
/*
* DMA stream for sample transfer, destination is TIM3 CCR3
*/
DMA1_Stream2->NDTR = length;
DMA1_Stream2->PAR = reinterpret_cast< uint32_t >(&(TIM3->CCR3));
DMA1_Stream2->M0AR = reinterpret_cast< uint32_t >(buf);
DMA1_Stream2->CR = DMA_SxCR_CHSEL_0 // Channel 1
| DMA_SxCR_PL // Very high priority
| DMA_SxCR_MSIZE_0 // 16 bit source size
| DMA_SxCR_PSIZE_0 // 16 bit destination size
| DMA_SxCR_MINC // Increment source pointer
| DMA_SxCR_DIR_0 // Memory to peripheral
| DMA_SxCR_TCIE // Transfer complete interrupt
| DMA_SxCR_TEIE; // Transfer error interrupt
if(mode == BUF_CIRC_DOUBLE)
{
DMA1_Stream2->CR |= DMA_SxCR_CIRC // Circular buffer mode
| DMA_SxCR_HTIE; // Half transfer interrupt
circularMode = true;
}
DMA1_Stream2->CR |= DMA_SxCR_EN; // Enable transfer
// Enable DMA interrupts
NVIC_ClearPendingIRQ(DMA1_Stream2_IRQn);
NVIC_SetPriority(DMA1_Stream2_IRQn, 10);
NVIC_EnableIRQ(DMA1_Stream2_IRQn);
// Enable compare channel
TIM3->CCR3 = buf[0];
TIM3->CCER |= TIM_CCER_CC3E;
TIM3->CR1 |= TIM_CR1_CEN;
// Start timer for DMA transfer triggering
TIM7->CR1 = TIM_CR1_CEN;
return 0;
}
stream_sample_t *outputStream_getIdleBuffer(const streamId id)
{
(void) id;
if(!circularMode) return nullptr;
return idleBuf;
}
bool outputStream_sync(const streamId id, const bool bufChanged)
{
(void) id;
if(circularMode && bufChanged)
{
stream_sample_t *ptr = outputStream_getIdleBuffer(id);
S16toU8(ptr, bufLen/2);
}
// Enter in critical section until the end of the function
FastInterruptDisableLock dLock;
Thread *curThread = Thread::IRQgetCurrentThread();
if((dmaWaiting != 0) && (dmaWaiting != curThread)) return false;
dmaWaiting = curThread;
do
{
Thread::IRQwait();
{
// Re-enable interrupts while waiting for IRQ
FastInterruptEnableLock eLock(dLock);
Thread::yield();
}
}
while((dmaWaiting != 0) && (running == true));
dmaWaiting = 0;
return true;
}
void outputStream_stop(const streamId id)
{
(void) id;
reqFinish = true;
}
void outputStream_terminate(const streamId id)
{
(void) id;
__disable_irq();
stopTransfer();
DMA1->LIFCR = DMA_LIFCR_CTCIF2
| DMA_LIFCR_CHTIF2
| DMA_LIFCR_CTEIF2;
__enable_irq();
}

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platform/drivers/audio/outputStream_Mod17.cpp
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/***************************************************************************
* Copyright (C) 2021 - 2023 by Federico Amedeo Izzo IU2NUO, *
* Niccolò Izzo IU2KIN *
* Frederik Saraci IU2NRO *
* Silvano Seva IU2KWO *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 3 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, see <http://www.gnu.org/licenses/> *
***************************************************************************/
#include <kernel/scheduler/scheduler.h>
#include <audio_stream.h>
#include <peripherals/gpio.h>
#include <data_conversion.h>
#include <hwconfig.h>
#include <timers.h>
#include <miosix.h>
static int priority = PRIO_BEEP;
static bool running = false; // Stream is running
static bool circularMode = false; // Circular mode enabled
static bool reqFinish = false; // Pending termination request
static size_t bufLen = 0; // Buffer length
static stream_sample_t *bufAddr = 0; // Start address of data buffer, fixed.
static stream_sample_t *idleBuf = 0;
using namespace miosix;
static Thread *dmaWaiting = 0;
/**
* \internal
* Stop an ongoing transfer, deactivating timers and DMA stream.
*/
static inline void stopTransfer()
{
// Stop DMA transfers
DMA1_Stream5->CR = 0;
DMA1_Stream6->CR = 0;
TIM7->CR1 = 0; // Shutdown timer
DAC->SR = 0; // Clear status flags
DAC->CR = DAC_CR_EN1; // Keep only channel 1 active
DAC->DHR12R1 = 1365; // Set channel 1 (RTX) to about 1.1V when idle
// Clear flags and restore priority level
running = false;
reqFinish = false;
circularMode = false;
priority = PRIO_BEEP;
}
/**
* \internal
* Actual implementation of DMA interrupt handler.
*/
void __attribute__((used)) DMA_Handler()
{
// Manage half transfer interrupt
if((DMA1->HISR & DMA_HISR_HTIF5) || (DMA1->HISR & DMA_HISR_HTIF6))
idleBuf = bufAddr;
else
idleBuf = bufAddr + (bufLen / 2);
// Stop transfer for linear buffer mode or pending termination request.
if((circularMode == false) || (reqFinish == true))
{
stopTransfer();
}
// Clear interrupt flags for stream 5 and 6
uint32_t mask = DMA_HISR_TEIF5
| DMA_HISR_TCIF5
| DMA_HISR_HTIF5
| DMA_HISR_TEIF6
| DMA_HISR_TCIF6
| DMA_HISR_HTIF6;
DMA1->HIFCR = DMA1->HISR & mask;
// Finally, wake up eventual pending threads
if(dmaWaiting == 0) return;
dmaWaiting->IRQwakeup();
if(dmaWaiting->IRQgetPriority()>Thread::IRQgetCurrentThread()->IRQgetPriority())
Scheduler::IRQfindNextThread();
dmaWaiting = 0;
}
// DMA 1, Stream 5: data transfer for RTX sink
void __attribute__((used)) DMA1_Stream5_IRQHandler()
{
saveContext();
asm volatile("bl _Z11DMA_Handlerv");
restoreContext();
}
// DMA 1, Stream 6: data transfer for speaker sink
void __attribute__((used)) DMA1_Stream6_IRQHandler()
{
saveContext();
asm volatile("bl _Z11DMA_Handlerv");
restoreContext();
}
streamId outputStream_start(const enum AudioSink destination,
const enum AudioPriority prio,
stream_sample_t * const buf,
const size_t length,
const enum BufMode mode,
const uint32_t sampleRate)
{
// Sanity check
if((buf == NULL) || (length == 0) || (sampleRate == 0)) return -1;
// This device cannot sink to buffers
if(destination == SINK_MCU) return -1;
// Check if an output stream is already opened and, in case, handle priority.
if(running)
{
if(prio < priority) return -1; // Lower priority, reject.
if(prio > priority) stopTransfer(); // Higher priority, takes over.
while(running) ; // Same priority, wait.
}
// Thread-safe block: assign priority, set stream as running and lock "beeps"
__disable_irq();
priority = prio;
running = true;
__enable_irq();
/*
* Convert buffer elements from int16_t to unsigned 8 bit values, as
* required by tone generator. Processing can be done in-place because the
* API mandates that the function caller does not modify the buffer content
* once this function has been called.
*/
S16toU12(buf, length);
bufAddr = buf;
bufLen = length;
idleBuf = bufAddr + (bufLen / 2);
// Configure GPIOs
gpio_setMode(BASEBAND_TX, INPUT_ANALOG); /* Baseband TX */
gpio_setMode(AUDIO_SPK, INPUT_ANALOG); /* Spk output */
/*
* Enable peripherals
*/
RCC->AHB1ENR |= RCC_AHB1ENR_DMA1EN;
RCC->APB1ENR |= RCC_APB1ENR_DACEN
| RCC_APB1ENR_TIM7EN;
__DSB();
/*
* Configure DAC and DMA stream
*/
uint32_t circular = 0;
if(mode == BUF_CIRC_DOUBLE)
{
circular = DMA_SxCR_CIRC // Circular buffer mode
| DMA_SxCR_HTIE; // Half transfer interrupt
circularMode = true;
}
if(destination == SINK_RTX)
{
DAC->CR |= DAC_CR_DMAEN1 // Enable DMA mode
| DAC_CR_TSEL1_1 // TIM7 TRGO as trigger source
| DAC_CR_TEN1 // Enable trigger input
| DAC_CR_EN1; // Enable DAC
DMA1_Stream5->NDTR = length;
DMA1_Stream5->PAR = reinterpret_cast< uint32_t >(&(DAC->DHR12R1));
DMA1_Stream5->M0AR = reinterpret_cast< uint32_t >(buf);
DMA1_Stream5->CR = DMA_SxCR_CHSEL // Channel 7
| DMA_SxCR_PL // Very high priority
| DMA_SxCR_MSIZE_0 // 16 bit source size
| DMA_SxCR_PSIZE_0 // 16 bit destination size
| DMA_SxCR_MINC // Increment source pointer
| DMA_SxCR_TCIE // Transfer complete interrupt
| DMA_SxCR_TEIE // Transfer error interrupt
| DMA_SxCR_DIR_0 // Memory to peripheral
| circular // Circular mode
| DMA_SxCR_EN; // Start transfer
NVIC_ClearPendingIRQ(DMA1_Stream5_IRQn);
NVIC_SetPriority(DMA1_Stream5_IRQn, 10);
NVIC_EnableIRQ(DMA1_Stream5_IRQn);
}
else
{
DAC->CR |= DAC_CR_DMAEN2 // Enable DMA mode
| DAC_CR_TSEL2_1 // TIM7 TRGO as trigger source
| DAC_CR_TEN2 // Enable trigger input
| DAC_CR_EN2; // Enable DAC
DMA1_Stream6->NDTR = length;
DMA1_Stream6->PAR = reinterpret_cast< uint32_t >(&(DAC->DHR12R2));
DMA1_Stream6->M0AR = reinterpret_cast< uint32_t >(buf);
DMA1_Stream6->CR = DMA_SxCR_CHSEL // Channel 7
| DMA_SxCR_PL // Very high priority
| DMA_SxCR_MSIZE_0 // 16 bit source size
| DMA_SxCR_PSIZE_0 // 16 bit destination size
| DMA_SxCR_MINC // Increment source pointer
| DMA_SxCR_TCIE // Transfer complete interrupt
| DMA_SxCR_TEIE // Transfer error interrupt
| DMA_SxCR_DIR_0 // Memory to peripheral
| circular // Circular mode
| DMA_SxCR_EN; // Start transfer
NVIC_ClearPendingIRQ(DMA1_Stream6_IRQn);
NVIC_SetPriority(DMA1_Stream6_IRQn, 10);
NVIC_EnableIRQ(DMA1_Stream6_IRQn);
}
/*
* TIM7 for conversion triggering via TIM7_TRGO, that is counter reload.
* APB1 frequency is 42MHz but timer runs at 84MHz, tick rate is 1MHz,
* reload register is configured based on desired sample rate.
*/
tim_setUpdateFreqency(TIM7, sampleRate, 84000000);
TIM7->CNT = 0;
TIM7->EGR = TIM_EGR_UG;
TIM7->CR2 = TIM_CR2_MMS_1;
TIM7->CR1 = TIM_CR1_CEN;
return 0;
}
stream_sample_t *outputStream_getIdleBuffer(const streamId id)
{
(void) id;
if(!circularMode) return nullptr;
return idleBuf;
}
bool outputStream_sync(const streamId id, const bool bufChanged)
{
(void) id;
if(circularMode && bufChanged)
{
stream_sample_t *ptr = outputStream_getIdleBuffer(id);
S16toU12(ptr, bufLen/2);
}
// Enter in critical section until the end of the function
FastInterruptDisableLock dLock;
Thread *curThread = Thread::IRQgetCurrentThread();
if((dmaWaiting != 0) && (dmaWaiting != curThread)) return false;
dmaWaiting = curThread;
do
{
Thread::IRQwait();
{
// Re-enable interrupts while waiting for IRQ
FastInterruptEnableLock eLock(dLock);
Thread::yield();
}
}
while((dmaWaiting != 0) && (running == true));
dmaWaiting = 0;
return true;
}
void outputStream_stop(const streamId id)
{
(void) id;
reqFinish = true;
}
void outputStream_terminate(const streamId id)
{
(void) id;
FastInterruptDisableLock dLock;
stopTransfer();
DMA1->HIFCR = DMA_HIFCR_CTEIF5
| DMA_HIFCR_CTCIF5
| DMA_HIFCR_CHTIF5;
DMA1->HIFCR = DMA_HIFCR_CTEIF6
| DMA_HIFCR_CTCIF6
| DMA_HIFCR_CHTIF6;
}

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platform/drivers/audio/outputStream_linux.c
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/***************************************************************************
* Copyright (C) 2021 - 2023 by Federico Amedeo Izzo IU2NUO, *
* Niccolò Izzo IU2KIN *
* Frederik Saraci IU2NRO *
* Silvano Seva IU2KWO *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 3 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, see <http://www.gnu.org/licenses/> *
***************************************************************************/
#include <audio_stream.h>
#include <pulse/pulseaudio.h>
#include <pulse/simple.h>
#include <pulse/error.h>
#include <pthread.h>
#include <stddef.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
// Expand opaque pa_simple struct
struct pa_simple
{
pa_threaded_mainloop *mainloop;
pa_context *context;
pa_stream *stream;
pa_stream_direction_t direction;
const void *read_data;
size_t read_index;
size_t read_length;
int operation_success;
};
static enum BufMode bufMode; // Buffer operation mode
static enum AudioPriority priority = PRIO_BEEP; // Priority level
static bool running = false; // Stream is running
static size_t bufLen = 0; // Total buffer length
static stream_sample_t *playBuf = NULL; // Buffer being reproduced
static stream_sample_t *idleBuf = NULL; // Idle buffer available to be filled
static pa_simple *paInstance = NULL; // Pulseaudio instance
static size_t remaining = 0;
static pthread_cond_t barrier;
static pthread_mutex_t mutex;
static void buf_circ_write_cb(pa_stream* s, size_t length, void* userdata)
{
(void) userdata;
if((s == NULL) || (length <= 0))
return;
if(length > remaining)
{
// We can play all the rest of the buffer
pa_stream_write(s, playBuf, remaining * sizeof(stream_sample_t),
NULL, 0, PA_SEEK_RELATIVE);
remaining = 0;
}
else
{
pa_stream_write(s, playBuf, length, NULL, 0, PA_SEEK_RELATIVE);
if (remaining > length)
remaining -= length;
else
remaining = 0;
}
// All data in playBuffer has been sent
if(remaining == 0)
{
// Reload counter
remaining = bufLen/2;
pthread_mutex_lock(&mutex);
// Swap idle and play buffers
stream_sample_t *tmp = idleBuf;
playBuf = idleBuf;
idleBuf = tmp;
// Unlock waiting threads
pthread_cond_signal(&barrier);
pthread_mutex_unlock(&mutex);
}
}
streamId outputStream_start(const enum AudioSink destination,
const enum AudioPriority prio,
stream_sample_t* const buffer,
const size_t length,
const enum BufMode mode,
const uint32_t sampleRate)
{
if(destination != SINK_SPK)
return -1;
// Check if an output stream is already opened and, in case, handle
// priority.
if(running)
{
if(prio < priority) return -1; // Lower priority, reject.
if(prio > priority) outputStream_stop(0); // Higher priority, takes over.
while(running) ; // Same priority, wait.
}
// Assign priority and set stream as running
running = true;
priority = prio;
bufMode = mode;
playBuf = buffer;
idleBuf = buffer + (length/2);
bufLen = length;
remaining = length/2;
int paError = 0;
bool success = true;
if(paInstance == NULL)
{
// Stream data sample format
static pa_sample_spec spec;
spec.format = PA_SAMPLE_S16LE;
spec.rate = 0;
spec.channels = 1;
spec.rate = sampleRate;
paInstance = pa_simple_new(NULL, "OpenRTX", PA_STREAM_PLAYBACK, NULL,
"Audio out", &spec, NULL, NULL, &paError);
if(paInstance == NULL)
{
fprintf(stderr, __FILE__ ": pa_simple_new() failed: %s\n",
pa_strerror(paError));
success = false;
}
else
{
pthread_mutex_init(&mutex, NULL);
pthread_cond_init(&barrier, NULL);
}
}
switch(mode)
{
case BUF_LINEAR:
if(pa_simple_write(paInstance, buffer, length, &paError) < 0)
success = false;
break;
case BUF_CIRC_DOUBLE:
{
if(paInstance->stream == NULL)
{
success = false;
break;
}
// Register write callback
pa_stream_set_write_callback(paInstance->stream, buf_circ_write_cb,
NULL);
// Set minimal prebuffering
const pa_buffer_attr attr =
{
.fragsize = -1,
.maxlength = -1,
.minreq = -1,
.prebuf = 320,
.tlength = -1,
};
pa_stream_set_buffer_attr(paInstance->stream, &attr, NULL, NULL);
// Get maximum pulse buffer size
size_t wsize = pa_stream_writable_size(paInstance->stream);
if(wsize > (length / 2))
wsize = length / 2;
// Start writing loop
pa_stream_write(paInstance->stream, playBuf, wsize, NULL, 0,
PA_SEEK_RELATIVE);
}
break;
}
if(success == false)
{
running = false;
priority = PRIO_BEEP;
return -1;
}
return 0;
}
stream_sample_t *outputStream_getIdleBuffer(const streamId id)
{
(void) id;
stream_sample_t *ptr = NULL;
if(bufMode == BUF_CIRC_DOUBLE)
{
pthread_mutex_lock(&mutex);
ptr = idleBuf;
pthread_mutex_unlock(&mutex);
}
return ptr;
}
bool outputStream_sync(const streamId id, const bool bufChanged)
{
(void) id;
(void) bufChanged;
if(bufMode == BUF_CIRC_DOUBLE)
{
pthread_mutex_lock(&mutex);
pthread_cond_wait(&barrier, &mutex);
pthread_mutex_unlock(&mutex);
}
//
// TODO syncronisation barrrier also for linear buffer mode
//
return true;
}
void outputStream_stop(const streamId id)
{
(void) id;
int error = 0;
if (pa_simple_flush(paInstance, &error) < 0)
{
fprintf(stderr, __FILE__": pa_simple_drain() failed: %s\n",
pa_strerror(error));
}
running = false;
priority = PRIO_BEEP;
}
void outputStream_terminate(const streamId id)
{
(void) id;
running = false;
priority = PRIO_BEEP;
if(paInstance != NULL)
{
pa_simple_free(paInstance);
pthread_mutex_destroy(&mutex);
pthread_cond_destroy(&barrier);
}
}

14
platform/drivers/stubs/audio_stub.c
Wyświetl plik

@ -18,9 +18,21 @@
* along with this program; if not, see <http://www.gnu.org/licenses/> *
***************************************************************************/
#include <interfaces/audio_stream.h>
#include <interfaces/audio.h>
const struct audioDevice outputDevices[] =
{
{NULL, 0, 0, SINK_MCU},
{NULL, 0, 0, SINK_RTX},
{NULL, 0, 0, SINK_SPK},
};
const struct audioDevice inputDevices[] =
{
{NULL, 0, 0, SINK_MCU},
{NULL, 0, 0, SINK_RTX},
{NULL, 0, 0, SINK_SPK},
};
void audio_init()
{