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#include <stdlib.h>
#include <string.h>
#include <freertos/FreeRTOS.h>
#include <freertos/semphr.h>
#include <freertos/task.h>
#include <freertos/queue.h>
#include <driver/i2s.h>
#include <driver/gpio.h>
#include <esp_log.h>
#include "eos.h"
#include "net.h"
#include "msgq.h"
#include "cell.h"
#define PCM_MIC_WM 128
#define PCM_HOLD_CNT_TX 3
#define PCM_HOLD_CNT_RX 3
#define PCM_SIZE_BUFQ 4
#define PCM_SIZE_BUF (PCM_MIC_WM * 4)
#define PCM_GPIO_BCK 33
#define PCM_GPIO_WS 4
#define PCM_GPIO_DIN 34
#define PCM_GPIO_DOUT 2
#define PCM_ETYPE_WRITE 1
static EOSBufQ pcm_buf_q;
static unsigned char *pcm_bufq_array[PCM_SIZE_BUFQ];
static EOSMsgQ pcm_evt_q;
static EOSMsgItem pcm_evtq_array[PCM_SIZE_BUFQ];
static char pcm_hold_tx;
static char pcm_active = 0;
static i2s_dev_t* I2S[I2S_NUM_MAX] = {&I2S0, &I2S1};
static QueueHandle_t i2s_queue;
static SemaphoreHandle_t mutex;
static const char *TAG = "EOS PCM";
static void i2s_event_task(void *pvParameters) {
i2s_event_t event;
ssize_t hold_bytes_r = 0;
unsigned char *hold_buf = NULL;
char hold_cnt = 0;
while (1) {
// Waiting for I2S event.
if (xQueueReceive(i2s_queue, &event, portMAX_DELAY)) {
switch (event.type) {
case I2S_EVENT_RX_DONE: {
ssize_t bytes_r;
size_t bytes_w;
uint16_t bytes_e;
unsigned char _type;
unsigned char *buf;
// Event of I2S receiving data
if (!hold_cnt) {
buf = eos_net_alloc();
buf[0] = EOS_CELL_MTYPE_VOICE | EOS_CELL_MTYPE_VOICE_PCM;
bytes_r = eos_cell_pcm_read(buf + 1, PCM_MIC_WM);
eos_net_send(EOS_NET_MTYPE_CELL, buf, bytes_r + 1);
} else {
hold_cnt--;
if (hold_buf == NULL) {
hold_buf = eos_net_alloc();
hold_buf[0] = EOS_CELL_MTYPE_VOICE | EOS_CELL_MTYPE_VOICE_PCM;
}
if (1 + hold_bytes_r + PCM_MIC_WM <= EOS_NET_MTU) hold_bytes_r += eos_cell_pcm_read(hold_buf + 1 + hold_bytes_r, PCM_MIC_WM);
if (hold_cnt == 0) {
eos_net_send(EOS_NET_MTYPE_CELL, hold_buf, hold_bytes_r + 1);
hold_bytes_r = 0;
hold_buf = NULL;
}
}
buf = NULL;
xSemaphoreTake(mutex, portMAX_DELAY);
if (pcm_hold_tx && (eos_msgq_len(&pcm_evt_q) == PCM_HOLD_CNT_TX)) pcm_hold_tx = 0;
if (!pcm_hold_tx) eos_msgq_pop(&pcm_evt_q, &_type, &buf, &bytes_e);
xSemaphoreGive(mutex);
if (buf) {
i2s_write(I2S_NUM_0, (const void *)buf, bytes_e, &bytes_w, portMAX_DELAY);
xSemaphoreTake(mutex, portMAX_DELAY);
eos_bufq_push(&pcm_buf_q, buf);
xSemaphoreGive(mutex);
}
break;
}
case I2S_EVENT_DMA_ERROR: {
ESP_LOGE(TAG, "*** I2S DMA ERROR ***");
break;
}
case I2S_EVENT_MAX: {
hold_cnt = PCM_HOLD_CNT_RX;
break;
}
default:
break;
}
}
}
vTaskDelete(NULL);
}
void eos_cell_pcm_init(void) {
int i;
i2s_config_t i2s_config = {
.mode = I2S_MODE_SLAVE | I2S_MODE_TX | I2S_MODE_RX,
.sample_rate = 32000,
.bits_per_sample = 32,
.channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
.communication_format = I2S_COMM_FORMAT_STAND_I2S,
.dma_buf_count = 4,
.dma_buf_len = PCM_MIC_WM,
.use_apll = true,
.fixed_mclk = 2048000 * 8,
.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1
};
i2s_pin_config_t pin_config = {
.bck_io_num = PCM_GPIO_BCK,
.ws_io_num = PCM_GPIO_WS,
.data_in_num = PCM_GPIO_DIN,
.data_out_num = PCM_GPIO_DOUT
};
i2s_driver_install(I2S_NUM_0, &i2s_config, 10, &i2s_queue); //install and start i2s driver
i2s_stop(I2S_NUM_0);
i2s_set_pin(I2S_NUM_0, &pin_config);
gpio_matrix_in(pin_config.ws_io_num, I2S0I_WS_IN_IDX, 1);
gpio_matrix_in(pin_config.bck_io_num, I2S0I_BCK_IN_IDX, 1);
ESP_LOGI(TAG, "TX FIFO:%d TX CHAN:%d RX FIFO:%d RX CHAN:%d", I2S[I2S_NUM_0]->fifo_conf.tx_fifo_mod, I2S[I2S_NUM_0]->conf_chan.tx_chan_mod, I2S[I2S_NUM_0]->fifo_conf.rx_fifo_mod, I2S[I2S_NUM_0]->conf_chan.rx_chan_mod);
I2S[I2S_NUM_0]->fifo_conf.tx_fifo_mod = 2;
I2S[I2S_NUM_0]->conf_chan.tx_chan_mod = 0;
I2S[I2S_NUM_0]->fifo_conf.rx_fifo_mod = 3;
I2S[I2S_NUM_0]->conf_chan.rx_chan_mod = 1;
// I2S[I2S_NUM_0]->conf.tx_mono = 1;
I2S[I2S_NUM_0]->conf.rx_mono = 1;
// I2S[I2S_NUM_0]->timing.tx_dsync_sw = 1
// I2S[I2S_NUM_0]->timing.rx_dsync_sw = 1
// I2S[I2S_NUM_0]->conf.sig_loopback = 0;
// I2S[I2S_NUM_0]->timing.tx_bck_in_inv = 1;
eos_msgq_init(&pcm_evt_q, pcm_evtq_array, PCM_SIZE_BUFQ);
eos_bufq_init(&pcm_buf_q, pcm_bufq_array, PCM_SIZE_BUFQ);
for (i=0; i<PCM_SIZE_BUFQ; i++) {
eos_bufq_push(&pcm_buf_q, malloc(PCM_SIZE_BUF));
}
mutex = xSemaphoreCreateBinary();
xSemaphoreGive(mutex);
// Create a task to handle i2s event from ISR
xTaskCreate(i2s_event_task, "i2s_event", EOS_TASK_SSIZE_I2S, NULL, EOS_TASK_PRIORITY_I2S, NULL);
ESP_LOGI(TAG, "INIT");
}
ssize_t eos_cell_pcm_read(unsigned char *data, size_t size) {
static unsigned char buf[PCM_SIZE_BUF];
size_t bytes_r;
int i;
if (size > PCM_MIC_WM) return EOS_ERR;
esp_err_t ret = i2s_read(I2S_NUM_0, (void *)buf, size * 4, &bytes_r, portMAX_DELAY);
if (ret != ESP_OK) return EOS_ERR;
for (i=0; i<size/2; i++) {
data[i * 2] = buf[i * 8 + 3];
data[i * 2 + 1] = buf[i * 8 + 2];
}
return bytes_r / 4;
}
static ssize_t pcm_expand(unsigned char *buf, unsigned char *data, size_t size) {
int i;
if (size > PCM_MIC_WM) return EOS_ERR;
memset(buf, 0, PCM_SIZE_BUF);
for (i=0; i<size/2; i++) {
buf[i * 8 + 3] = data[i * 2];
buf[i * 8 + 2] = data[i * 2 + 1];
}
return size * 4;
}
int eos_cell_pcm_push(unsigned char *data, size_t size) {
unsigned char *buf = NULL;
ssize_t esize;
int rv;
if (size > PCM_MIC_WM) return EOS_ERR;
xSemaphoreTake(mutex, portMAX_DELAY);
if (!pcm_active) {
xSemaphoreGive(mutex);
return EOS_ERR;
}
if (pcm_hold_tx && (eos_msgq_len(&pcm_evt_q) == PCM_HOLD_CNT_TX)) {
unsigned char _type;
uint16_t _len;
eos_msgq_pop(&pcm_evt_q, &_type, &buf, &_len);
} else {
buf = eos_bufq_pop(&pcm_buf_q);
}
xSemaphoreGive(mutex);
if (buf == NULL) return EOS_ERR_EMPTY;
esize = pcm_expand(buf, data, size);
if (esize < 0) {
xSemaphoreTake(mutex, portMAX_DELAY);
eos_bufq_push(&pcm_buf_q, buf);
xSemaphoreGive(mutex);
return esize;
}
xSemaphoreTake(mutex, portMAX_DELAY);
rv = eos_msgq_push(&pcm_evt_q, PCM_ETYPE_WRITE, buf, esize);
if (rv) eos_bufq_push(&pcm_buf_q, buf);
xSemaphoreGive(mutex);
return rv;
}
void eos_cell_pcm_start(void) {
i2s_event_t evt;
xSemaphoreTake(mutex, portMAX_DELAY);
if (pcm_active) {
xSemaphoreGive(mutex);
return;
}
while (1) {
unsigned char _type;
unsigned char *buf;
uint16_t len;
eos_msgq_pop(&pcm_evt_q, &_type, &buf, &len);
if (buf) {
eos_bufq_push(&pcm_buf_q, buf);
} else {
break;
}
}
pcm_active = 1;
pcm_hold_tx = 1;
xSemaphoreGive(mutex);
evt.type = I2S_EVENT_MAX; /* my type */
xQueueSend(i2s_queue, &evt, portMAX_DELAY);
i2s_zero_dma_buffer(I2S_NUM_0);
i2s_start(I2S_NUM_0);
}
void eos_cell_pcm_stop(void) {
char active;
xSemaphoreTake(mutex, portMAX_DELAY);
active = pcm_active;
pcm_active = 0;
xSemaphoreGive(mutex);
if (active) i2s_stop(I2S_NUM_0);
}
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