i2s: update driver

Author: redchenjs

main/inc/device/i2s.h

@@ -9,5 +9,6 @@
 #define DEVICE_I2S_C_
 
 extern void i2s0_init(void);
+extern void i2s0_set_sample_rate(int rate);
 
 #endif /* DEVICE_I2S_C_ */

main/src/device/i2s.c

@@ -8,32 +8,38 @@
 #include "freertos/FreeRTOS.h"
 #include "driver/i2s.h"
 
+static int i2s0_sample_rate = 44100;
+static int i2s0_bits_per_sample = 16;
+
 void i2s0_init(void)
 {
-    int use_apll = 0;
     esp_chip_info_t chip_info;
     esp_chip_info(&chip_info);
-    // Don't use apll on rev0 chips
-    if (chip_info.revision != 0) {
-        use_apll = 1;
-    }
     i2s_config_t i2s_config = {
         .mode = I2S_MODE_MASTER | I2S_MODE_TX,                                  // Only TX
-        .sample_rate = 44100,
-        .bits_per_sample = 16,                                              
-        .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,                           // 2-channels
         .communication_format = I2S_COMM_FORMAT_I2S | I2S_COMM_FORMAT_I2S_MSB,
+        .use_apll = chip_info.revision,                                         // Don't use apll on rev0 chips
+        .sample_rate = i2s0_sample_rate,
+        .bits_per_sample = i2s0_bits_per_sample,
+        .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,                           // 2-channels
         .dma_buf_count = 8,
         .dma_buf_len = 64,
-        .use_apll = use_apll,
         .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1                                // Interrupt level 1
     };
+    i2s_driver_install(0, &i2s_config, 0, NULL);
     i2s_pin_config_t pin_config = {
         .bck_io_num = 22,
         .ws_io_num = 21,
         .data_out_num = 19,
         .data_in_num = -1                                                       // Not used
     };
-    i2s_driver_install(0, &i2s_config, 0, NULL);
     i2s_set_pin(0, &pin_config);
 }
+
+void i2s0_set_sample_rate(int rate)
+{
+    if (rate != i2s0_sample_rate) {
+        i2s_set_sample_rates(0, rate);
+        i2s0_sample_rate = rate;
+    }
+}