1 files changed, 135 insertions, 0 deletions
diff --git a/code/esp32/components/eos/pcm.c b/code/esp32/components/eos/pcm.c
new file mode 100644
index 0000000..10f7914
--- /dev/null
+++ b/code/esp32/components/eos/pcm.c
@@ -0,0 +1,135 @@
+#include <stdio.h>
+#include <string.h>
+
+#include <freertos/FreeRTOS.h>
+#include <freertos/task.h>
+#include <freertos/queue.h>
+#include <driver/i2s.h>
+#include <esp_log.h>
+
+#include "eos.h"
+#include "modem.h"
+#include "fe310.h"
+
+static i2s_dev_t* I2S[I2S_NUM_MAX] = {&I2S0, &I2S1};
+
+#define BUF_SIZE    2048
+
+static QueueHandle_t i2s_queue;
+
+static void i2s_event_task(void *pvParameters) {
+    size_t size_out;
+    i2s_event_t event;
+    // Reserve a buffer and process incoming data
+    uint8_t *data = (uint8_t *) malloc(BUF_SIZE);
+
+    int first = 1;
+    uint8_t *data_first = NULL;
+
+    while (1) {
+        // Waiting for I2S event.
+        if (xQueueReceive(i2s_queue, (void * )&event, (portTickType)portMAX_DELAY)) {
+            switch (event.type) {
+                case I2S_EVENT_RX_DONE:
+                    // Event of I2S receiving data
+                    // printf("*** I2S DATA RECEIVED: %d\n ***", event.size);
+                    i2s_read(I2S_NUM_0, (void *)data, BUF_SIZE, &size_out, 1000 / portTICK_RATE_MS);
+                    if (first) {
+                        if (data_first) {
+                            first = 0;
+                            i2s_write(I2S_NUM_0, (const void *)data_first, BUF_SIZE, &size_out, 1000 / portTICK_RATE_MS);
+                            free(data_first);
+                            data_first = NULL;
+                        } else {
+                            data_first = (uint8_t *) malloc(BUF_SIZE);
+                            memcpy(data_first, data, BUF_SIZE);
+                        }
+                        
+                    }
+                    i2s_write(I2S_NUM_0, (const void *)data, BUF_SIZE, &size_out, 1000 / portTICK_RATE_MS);
+                    break;
+                case I2S_EVENT_DMA_ERROR:
+                    printf("*** I2S DMA ERROR ***");
+                    break;
+                default:
+                    break;
+            }
+        }
+    }
+    free(data);
+    vTaskDelete(NULL);
+}
+
+static void i2s_write_task(void *pvParameters) {
+    uint8_t *data = (uint8_t *) malloc(BUF_SIZE);
+    memset(data, 0x0, BUF_SIZE);
+
+    int i;
+    for (i=0; i<BUF_SIZE; i+=16) {
+        data[i+3] = 0xaa;
+        data[i+2] = 0xff;
+    }
+    while(1) {
+        size_t size_out;
+        // i2s_read(I2S_NUM_0, (void *)data, BUF_SIZE, &size_out, 1000 / portTICK_RATE_MS);
+        // printf("!! I2S DATA IN: %d\n", size_out);
+        i2s_write(I2S_NUM_0, (const void *)data, BUF_SIZE, &size_out, 1000 / portTICK_RATE_MS);
+        printf("I2S DATA OUT: %d\n", size_out);
+    }
+    free(data);
+    vTaskDelete(NULL);
+}
+
+void eos_pcm_init(void) {
+    esp_err_t err;
+    
+    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_PCM | I2S_COMM_FORMAT_PCM_LONG,
+        .dma_buf_count = 4,
+        .dma_buf_len = 512,
+        .use_apll = true,
+        .fixed_mclk = 2048000 * 8,
+        .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1
+    };
+    
+    i2s_pin_config_t pin_config = {
+        .bck_io_num = 33,
+        .ws_io_num = 4,
+        .data_out_num = 2,
+        .data_in_num = 34
+    };
+    err = i2s_driver_install(I2S_NUM_0, &i2s_config, 10, &i2s_queue);   //install and start i2s driver
+    printf("I2S ERR: %d\n", err);
+    err = i2s_set_pin(I2S_NUM_0, &pin_config);
+    printf("I2S ERR: %d\n", err);
+    i2s_stop(I2S_NUM_0);
+    I2S[I2S_NUM_0]->conf.tx_mono = 1;
+    I2S[I2S_NUM_0]->conf.rx_mono = 1;
+    i2s_start(I2S_NUM_0);
+
+    // Create a task to handle i2s event from ISR
+    xTaskCreate(i2s_event_task, "i2s_event_task", 2048, NULL, EOS_PRIORITY_PCM, NULL);
+    // xTaskCreate(i2s_write_task, "i2s_write_task", 2048, NULL, EOS_PRIORITY_PCM, NULL);
+}
+
+ssize_t eos_pcm_write(void *data, size_t size) {
+    size_t size_out;
+    
+    esp_err_t ret = i2s_write(I2S_NUM_0, (const void *)data, size, &size_out, portMAX_DELAY);
+    if (ret != ESP_OK) return EOS_ERR;
+    return size_out;
+}
+
+void eos_pcm_call(void) {
+    const char *s = "ATD0631942317;\r";
+
+    i2s_zero_dma_buffer(I2S_NUM_0);
+    eos_modem_write((void *)s, strlen(s));
+    vTaskDelay(1000 / portTICK_RATE_MS);
+    i2s_start(I2S_NUM_0);
+}
+