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pico-extras/src/rp2_common/pico_audio_pwm/audio_pwm.c

384 wiersze
13 KiB
C
Czysty Wina Historia

/*
* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <stdarg.h>
#include <string.h>
#include <stdio.h>
#include "pico/audio_pwm.h"
#include "hardware/gpio.h"
#include "hardware/dma.h"
#include "hardware/pio.h"
#include "hardware/irq.h"
#include "pico/multicore.h"
#include "pico/sem.h"
#include "pico/audio_pwm/sample_encoding.h"
#include "audio_pwm.pio.h"
// TODO: add noise shaped fixed dither
#define audio_pio __CONCAT(pio, PICO_AUDIO_PWM_PIO)
#define GPIO_FUNC_PIOx __CONCAT(GPIO_FUNC_PIO, PICO_AUDIO_PWM_PIO)
#define DREQ_PIOx_TX0 __CONCAT(__CONCAT(DREQ_PIO, PICO_AUDIO_PWM_PIO), _TX0)
// ======================
// == DEBUGGING =========
#define ENABLE_PIO_AUDIO_PWM_ASSERTIONS
CU_REGISTER_DEBUG_PINS(audio_timing, audio_underflow)
// ---- select at most one ---
//CU_SELECT_DEBUG_PINS(audio_timing)
// ======================
#ifdef ENABLE_PIO_AUDIO_PWM_ASSERTIONS
#define audio_assert(x) assert(x)
#else
#define audio_assert(x) (void)0
#endif
#define _UNDERSCORE(x, y) x ## _ ## y
#define _CONCAT(x, y) _UNDERSCORE(x,y)
#define audio_program _CONCAT(program_name,program)
#define audio_program_get_default_config _CONCAT(program_name,program_get_default_config)
#define audio_entry_point _CONCAT(program_name,offset_entry_point)
static bool audio_enabled;
static bool push_queuing_to_core1;
static void __isr __time_critical_func(audio_pwm_dma_irq_handler)();
static struct {
audio_buffer_pool_t *playback_buffer_pool[PICO_AUDIO_PWM_MAX_CHANNELS];
audio_buffer_t *playing_buffer[PICO_AUDIO_PWM_MAX_CHANNELS];
// ----- begin protected by free_list_spin_lock -----
uint8_t pio_sm[PICO_AUDIO_PWM_MAX_CHANNELS];
uint8_t dma_channel[PICO_AUDIO_PWM_MAX_CHANNELS];
int channel_count;
} shared_state;
const audio_pwm_channel_config_t default_left_channel_config =
{
.core = {
.base_pin = PICO_AUDIO_PWM_L_PIN,
.pio_sm = 0,
.dma_channel = 0
},
.pattern = 1,
};
const audio_pwm_channel_config_t default_right_channel_config =
{
.core = {
.base_pin = PICO_AUDIO_PWM_R_PIN,
.pio_sm = 1,
.dma_channel = 1
},
.pattern = 1,
};
const audio_pwm_channel_config_t default_mono_channel_config =
{
.core = {
.base_pin = PICO_AUDIO_PWM_MONO_PIN,
.pio_sm = 0,
.dma_channel = 0
},
.pattern = 3,
};
static audio_buffer_t silence_buffer;
static inline void audio_start_dma_transfer(int ch)
{
#if PICO_AUDIO_PWM_NOOP
assert(false);
#else
assert(!shared_state.playing_buffer[ch]);
audio_buffer_t *ab = take_audio_buffer(shared_state.playback_buffer_pool[ch], false);
shared_state.playing_buffer[ch] = ab;
DEBUG_PINS_SET(audio_underflow, 4);
if (!ab)
{
DEBUG_PINS_XOR(audio_underflow, 2);
// just play some silence
ab = &silence_buffer;
// static int foo;
// printf("underflow %d\n", foo++);
DEBUG_PINS_XOR(audio_underflow, 2);
}
DEBUG_PINS_CLR(audio_underflow, 4);
assert(ab->sample_count);
// todo better naming of format->format->format!!
assert(ab->format->format->format == NATIVE_BUFFER_FORMAT);
assert(ab->format->format->channel_count == 1);
assert(ab->format->sample_stride == sizeof(pwm_cmd_t));
dma_channel_transfer_from_buffer_now(shared_state.dma_channel[ch], ab->buffer->bytes,
ab->sample_count * sizeof(pwm_cmd_t) / 4);
}
semaphore_t sem_transfer_buffer_fill, sem_transfer_buffer_drain;
void *volatile transfer_buffer;
int32_t transfer_buffer_sample_count;
// irq handler for DMA
static void __isr __time_critical_func(audio_pwm_dma_irq_handler)()
{
#if PICO_AUDIO_PWM_NOOP
assert(false);
#else
// todo better DMA channel handling? (should we combine to keep channels in sync?)
// (pico_audio - sync should be maintained by source of pico_audio buffers, though we need to be able to insert
// the correct amount of silence to re-align)
for(int ch = 0; ch < shared_state.channel_count; ch++)
{
uint dma_channel = shared_state.dma_channel[ch];
if (dma_irqn_get_channel_status(PICO_AUDIO_PWM_DMA_IRQ, dma_channel)) {
dma_irqn_acknowledge_channel(PICO_AUDIO_PWM_DMA_IRQ, dma_channel);
DEBUG_PINS_SET(audio_timing, 4);
// free the buffer we just finished
if (shared_state.playing_buffer[ch])
{
give_audio_buffer(shared_state.playback_buffer_pool[ch], shared_state.playing_buffer[ch]);
#ifndef NDEBUG
shared_state.playing_buffer[ch] = 0;
#endif
}
audio_start_dma_transfer(ch);
DEBUG_PINS_CLR(audio_timing, 4);
}
}
#endif
}
audio_format_t pwm_consumer_format;
audio_buffer_format_t pwm_consumer_buffer_format = {
.format = &pwm_consumer_format,
.sample_stride = sizeof(pwm_cmd_t)
};
audio_buffer_pool_t *pwm_consumer_pool;
const audio_format_t *audio_pwm_setup(const audio_format_t *intended_audio_format, int32_t max_latency_ms,
const audio_pwm_channel_config_t *channel_config0, ...)
{
va_list args;
assert(max_latency_ms == -1); // not implemented yet
__builtin_memset(&shared_state, 0, sizeof(shared_state));
// init non zero members
#if !PICO_AUDIO_PWM_NOOP
shared_state.channel_count = intended_audio_format->channel_count;
#if !PICO_AUDIO_PWM_ENABLE_NOISE_SHAPING
pwm_consumer_format.format = AUDIO_BUFFER_FORMAT_PIO_PWM_CMD1;
pwm_consumer_format.channel_count = 1;
#else
pwm_consumer_format.format = AUDIO_BUFFER_FORMAT_PIO_PWM_CMD3;
pwm_consumer_format.channel_count = 1;
#endif
#ifndef AUDIO_HALF_FREQ
pwm_consumer_format.sample_freq = 22058;
#else
pwm_consumer_format.sample_freq = 11029;
#endif
for(int i = 0; i < shared_state.channel_count; i++)
{
shared_state.playback_buffer_pool[i] = audio_new_consumer_pool(&pwm_consumer_buffer_format,
PICO_AUDIO_PWM_BUFFERS_PER_CHANNEL,
PICO_AUDIO_PWM_BUFFER_SAMPLE_LENGTH);
}
__mem_fence_release();
silence_buffer.buffer = pico_buffer_alloc(PICO_AUDIO_PWM_SILENCE_BUFFER_SAMPLE_LENGTH * sizeof(silence_cmd));
for(int i = 0; i < PICO_AUDIO_PWM_SILENCE_BUFFER_SAMPLE_LENGTH; i++)
{
__builtin_memcpy((void *) (silence_buffer.buffer->bytes + i * sizeof(silence_cmd)), &silence_cmd,
sizeof(silence_cmd));
}
silence_buffer.sample_count = PICO_AUDIO_PWM_SILENCE_BUFFER_SAMPLE_LENGTH;
silence_buffer.format = &pwm_consumer_buffer_format;
va_start(args, channel_config0);
uint offset = pio_add_program(audio_pio, &audio_program);
const audio_pwm_channel_config_t *config = channel_config0;
irq_add_shared_handler(DMA_IRQ_0 + PICO_AUDIO_PWM_DMA_IRQ, audio_pwm_dma_irq_handler, PICO_SHARED_IRQ_HANDLER_DEFAULT_ORDER_PRIORITY);
for(int ch = 0; ch < shared_state.channel_count; ch++)
{
if (!config)
{
config = va_arg(args, const struct audio_pwm_channel_config *);
}
gpio_set_function(config->core.base_pin, GPIO_FUNC_PIOx);
uint8_t sm = shared_state.pio_sm[ch] = config->core.pio_sm;
pio_sm_claim(audio_pio, sm);
pio_sm_config sm_config = audio_program_get_default_config(offset);
sm_config_set_out_pins(&sm_config, config->core.base_pin, 1);
sm_config_set_sideset_pins(&sm_config, config->core.base_pin);
// disable auto-pull for !OSRE (which doesn't work with auto-pull)
static_assert(CYCLES_PER_SAMPLE <= 18, "");
sm_config_set_out_shift(&sm_config, true, false, CMD_BITS + CYCLES_PER_SAMPLE);
pio_sm_init(audio_pio, sm, offset, &sm_config);
pio_sm_set_consecutive_pindirs(audio_pio, sm, config->core.base_pin, 1, true);
pio_sm_set_pins(audio_pio, sm, 0);
// todo this should be part of sm_init
pio_sm_exec(audio_pio, sm, pio_encode_jmp(offset + audio_entry_point)); // jmp to ep
uint8_t dma_channel = config->core.dma_channel;
dma_channel_claim(dma_channel);
shared_state.dma_channel[ch] = dma_channel;
dma_channel_config dma_config = dma_channel_get_default_config(dma_channel);
channel_config_set_dreq(&dma_config, DREQ_PIOx_TX0 + sm);
dma_channel_configure(dma_channel,
&dma_config,
&audio_pio->txf[sm], // dest
NULL, // src
0, // count
false // trigger
);
dma_irqn_set_channel_enabled(PICO_AUDIO_PWM_DMA_IRQ, dma_channel, 1);
config = 0;
}
va_end(args);
#endif
#ifndef NDEBUG
puts("PicoAudio: initialized\n");
#endif
pwm_consumer_pool = (shared_state.playback_buffer_pool[0]); // forcing channel 0 to be consumer for now
// todo we need to update this to what is exact
return intended_audio_format;
}
void audio_pwm_set_enabled(bool enabled)
{
if (enabled != audio_enabled)
{
#ifndef NDEBUG
if (enabled)
{
puts("Enabling PIO PWM audio\n");
}
#endif
#if !PICO_AUDIO_PWM_NOOP
irq_set_enabled(DMA_IRQ_0 + PICO_AUDIO_PWM_DMA_IRQ, enabled);
if (enabled)
{
// todo this is wrong
for(int ch = 0; ch < shared_state.channel_count; ch++)
{
audio_start_dma_transfer(ch);
}
}
// todo need to start them in sync - need WAIT in program
for(int ch = 0; ch < shared_state.channel_count; ch++)
{
pio_sm_set_enabled(audio_pio, shared_state.pio_sm[ch], enabled);
}
#endif
audio_enabled = enabled;
}
}
#pragma GCC push_options
#ifdef __arm__
// seems uber keen to inline audio_queue_samples which is large
#pragma GCC optimize("O1")
#endif
void core1_worker()
{
while (true)
{
sem_acquire_blocking(&sem_transfer_buffer_drain);
// audio_queue_samples(0, transfer_buffer, transfer_buffer_sample_count, 1, true);
sem_release(&sem_transfer_buffer_fill);
}
__builtin_unreachable();
}
#pragma GCC pop_options
bool audio_start_queue_work_on_core_1()
{
if (!push_queuing_to_core1)
{
puts("In the spirit of the season, core 1 is helping out too...\n");
sem_init(&sem_transfer_buffer_drain, 0, 1);
// one fill is implicitly owned by the client application as it has a buffer
// (note the count here is actually the number of buffers the client has)
sem_init(&sem_transfer_buffer_fill, 2, 1);
multicore_launch_core1(core1_worker);
push_queuing_to_core1 = true;
}
return true;
}
#endif
static struct producer_pool_blocking_give_connection producer_pool_blocking_give_connection_singleton = {
.core = {
.consumer_pool_take = consumer_pool_take_buffer_default,
.consumer_pool_give = consumer_pool_give_buffer_default,
.producer_pool_take = producer_pool_take_buffer_default,
}
// rest 0 initialized
};
bool audio_pwm_default_connect(audio_buffer_pool_t *producer_pool, bool dedicate_core_1)
{
if (!dedicate_core_1)
{
printf("Connecting PIO PWM audio via 'blocking give'\n");
assert(pwm_consumer_pool);
assert(pwm_consumer_pool->format->channel_count == 1); // for now
// todo oops this is pulling in everything!
switch (producer_pool->format->format) {
case AUDIO_BUFFER_FORMAT_PCM_S16:
producer_pool_blocking_give_connection_singleton.core.producer_pool_give = producer_pool_blocking_give_to_pwm_s16;
break;
case AUDIO_BUFFER_FORMAT_PCM_S8:
producer_pool_blocking_give_connection_singleton.core.producer_pool_give = producer_pool_blocking_give_to_pwm_s8;
break;
case AUDIO_BUFFER_FORMAT_PCM_U16:
producer_pool_blocking_give_connection_singleton.core.producer_pool_give = producer_pool_blocking_give_to_pwm_s16;
break;
case AUDIO_BUFFER_FORMAT_PCM_U8:
producer_pool_blocking_give_connection_singleton.core.producer_pool_give = producer_pool_blocking_give_to_pwm_s8;
break;
default:
return false;
}
audio_complete_connection(&producer_pool_blocking_give_connection_singleton.core, producer_pool,
pwm_consumer_pool);
return true;
}
else
{
assert(false);
}
return false;
}
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