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/*
* Copyright 2023 jacqueline <me@jacqueline.id.au>
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#include "i2s_dac.hpp"
#include <cstdint>
#include <cstring>
#include "assert.h"
#include "driver/i2c.h"
#include "driver/i2s_common.h"
#include "driver/i2s_std.h"
#include "esp_attr.h"
#include "esp_err.h"
#include "esp_log.h"
#include "freertos/portmacro.h"
#include "freertos/projdefs.h"
#include "hal/gpio_types.h"
#include "hal/i2c_types.h"
#include "gpios.hpp"
#include "hal/i2s_types.h"
#include "i2c.hpp"
#include "soc/clk_tree_defs.h"
#include "sys/_stdint.h"
namespace drivers {
static const char* kTag = "i2s_dac";
static const i2s_port_t kI2SPort = I2S_NUM_0;
auto I2SDac::create(IGpios* expander) -> std::optional<I2SDac*> {
i2s_chan_handle_t i2s_handle;
i2s_chan_config_t channel_config =
I2S_CHANNEL_DEFAULT_CONFIG(kI2SPort, I2S_ROLE_MASTER);
// Use the maximum possible DMA buffer size, since a smaller number of large
// copies is faster than a large number of small copies.
channel_config.dma_frame_num = 1024;
// Triple buffering should be enough to keep samples flowing smoothly.
// TODO(jacqueline): verify this with 192kHz 32bps.
channel_config.dma_desc_num = 4;
// channel_config.auto_clear = true;
ESP_ERROR_CHECK(i2s_new_channel(&channel_config, &i2s_handle, NULL));
//
// First, instantiate the instance so it can do all of its power on
// configuration.
std::unique_ptr<I2SDac> dac = std::make_unique<I2SDac>(expander, i2s_handle);
// Whilst we wait for the initial boot, we can work on installing the I2S
// driver.
i2s_std_config_t i2s_config = {
.clk_cfg = dac->clock_config_,
.slot_cfg = dac->slot_config_,
.gpio_cfg = {.mclk = GPIO_NUM_0,
.bclk = GPIO_NUM_26,
.ws = GPIO_NUM_27,
.dout = GPIO_NUM_5,
.din = I2S_GPIO_UNUSED,
.invert_flags =
{
.mclk_inv = false,
.bclk_inv = false,
.ws_inv = true,
}},
};
if (esp_err_t err =
i2s_channel_init_std_mode(i2s_handle, &i2s_config) != ESP_OK) {
ESP_LOGE(kTag, "failed to initialise i2s channel %x", err);
return {};
}
return dac.release();
}
I2SDac::I2SDac(IGpios* gpio, i2s_chan_handle_t i2s_handle)
: gpio_(gpio),
i2s_handle_(i2s_handle),
i2s_active_(false),
active_page_(),
clock_config_(I2S_STD_CLK_DEFAULT_CONFIG(44100)),
slot_config_(I2S_STD_MSB_SLOT_DEFAULT_CONFIG(I2S_DATA_BIT_WIDTH_16BIT,
I2S_SLOT_MODE_STEREO)) {
clock_config_.clk_src = I2S_CLK_SRC_PLL_160M;
gpio_->WriteSync(IGpios::Pin::kAmplifierEnable, false);
}
I2SDac::~I2SDac() {
Stop();
i2s_del_channel(i2s_handle_);
}
auto I2SDac::Start() -> void {
gpio_->WriteSync(IGpios::Pin::kAmplifierEnable, true);
vTaskDelay(pdMS_TO_TICKS(1));
i2s_channel_enable(i2s_handle_);
i2s_active_ = true;
}
auto I2SDac::Stop() -> void {
i2s_channel_disable(i2s_handle_);
vTaskDelay(pdMS_TO_TICKS(1));
gpio_->WriteSync(IGpios::Pin::kAmplifierEnable, false);
i2s_active_ = false;
}
auto I2SDac::Reconfigure(Channels ch, BitsPerSample bps, SampleRate rate)
-> void {
if (i2s_active_) {
i2s_channel_disable(i2s_handle_);
}
switch (ch) {
case CHANNELS_MONO:
slot_config_.slot_mode = I2S_SLOT_MODE_MONO;
break;
case CHANNELS_STEREO:
slot_config_.slot_mode = I2S_SLOT_MODE_STEREO;
break;
}
switch (bps) {
case BPS_16:
slot_config_.data_bit_width = I2S_DATA_BIT_WIDTH_16BIT;
break;
case BPS_24:
slot_config_.data_bit_width = I2S_DATA_BIT_WIDTH_24BIT;
break;
case BPS_32:
slot_config_.data_bit_width = I2S_DATA_BIT_WIDTH_32BIT;
break;
}
ESP_ERROR_CHECK(i2s_channel_reconfig_std_slot(i2s_handle_, &slot_config_));
clock_config_.sample_rate_hz = rate;
// If we have an MCLK/SCK, then it must be a multiple of both the sample rate
// and the bit clock. At 24 BPS, we therefore have to change the MCLK multiple
// to avoid issues at some sample rates. (e.g. 48KHz)
clock_config_.mclk_multiple =
bps == BPS_24 ? I2S_MCLK_MULTIPLE_384 : I2S_MCLK_MULTIPLE_256;
ESP_ERROR_CHECK(i2s_channel_reconfig_std_clock(i2s_handle_, &clock_config_));
if (i2s_active_) {
i2s_channel_enable(i2s_handle_);
}
}
auto I2SDac::WriteData(const cpp::span<const std::byte>& data) -> void {
std::size_t bytes_written = 0;
esp_err_t err = i2s_channel_write(i2s_handle_, data.data(), data.size_bytes(),
&bytes_written, portMAX_DELAY);
if (err != ESP_ERR_TIMEOUT) {
ESP_ERROR_CHECK(err);
}
}
extern "C" IRAM_ATTR auto callback(i2s_chan_handle_t handle,
i2s_event_data_t* event,
void* user_ctx) -> bool {
if (event == nullptr || user_ctx == nullptr) {
return false;
}
if (event->data == nullptr || event->size == 0) {
return false;
}
uint8_t** buf = reinterpret_cast<uint8_t**>(event->data);
StreamBufferHandle_t src = reinterpret_cast<StreamBufferHandle_t>(user_ctx);
BaseType_t ret = false;
std::size_t bytes_received =
xStreamBufferReceiveFromISR(src, *buf, event->size, &ret);
if (bytes_received < event->size) {
memset(*buf + bytes_received, 0, event->size - bytes_received);
}
return ret;
}
auto I2SDac::SetSource(StreamBufferHandle_t buffer) -> void {
if (i2s_active_) {
ESP_ERROR_CHECK(i2s_channel_disable(i2s_handle_));
}
i2s_event_callbacks_t callbacks{
.on_recv = NULL,
.on_recv_q_ovf = NULL,
.on_sent = NULL,
.on_send_q_ovf = NULL,
};
if (buffer != nullptr) {
callbacks.on_sent = &callback;
}
i2s_channel_register_event_callback(i2s_handle_, &callbacks, buffer);
if (i2s_active_) {
ESP_ERROR_CHECK(i2s_channel_enable(i2s_handle_));
}
}
} // namespace drivers
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