initial commit

project/realtek_ameba1_va0_example/example_sources/i2s_bypass/readme.txt

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+Example Description
+
+This example describes how to use i2s by using mbed extend api
+Use TXRX mode to archive software bypass mode
+
+NOTE: RX need clock generated by TX. This mode can do TX/RX in the same time.
+
+1.Plug ALC5651 shield to Ameba HDK
+   
+2.Run the main function.
+
+3.Plug earphone to Green phone jack
+
+4.Plug audio source to Red phone jack
+

project/realtek_ameba1_va0_example/example_sources/i2s_bypass/src/main.c

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+/* This is software bypass example */
+#include "FreeRTOS.h"
+#include "task.h"
+#include "diag.h"
+#include "main.h"
+
+#include "i2s_api.h"
+
+/**
+  * @brief  Main program.
+  * @param  None
+  * @retval None
+  */
+#include "alc5651.h"
+
+i2s_t i2s_obj;
+
+#define I2S_DMA_PAGE_SIZE	768   // 2 ~ 4096
+#define I2S_DMA_PAGE_NUM    4   // Vaild number is 2~4
+
+u8 i2s_tx_buf[I2S_DMA_PAGE_SIZE*I2S_DMA_PAGE_NUM];
+u8 i2s_rx_buf[I2S_DMA_PAGE_SIZE*I2S_DMA_PAGE_NUM];
+
+#define I2S_SCLK_PIN            PC_1
+#define I2S_WS_PIN              PC_0
+#define I2S_SD_PIN              PC_2
+
+void test_tx_complete(void *data, char *pbuf)
+{    
+	return ;
+}
+
+void test_rx_complete(void *data, char* pbuf)
+{
+    i2s_t *obj = (i2s_t *)data;
+    int *ptx_buf;
+
+    static u32 count=0;
+    count++;
+    if ((count&1023) == 1023)
+    {
+         DBG_8195A_I2S_LVL(VERI_I2S_LVL, ".\n");
+    }
+
+    ptx_buf = i2s_get_tx_page(obj);
+    _memcpy((void*)ptx_buf, (void*)pbuf, I2S_DMA_PAGE_SIZE);
+	i2s_send_page(obj, (uint32_t*)ptx_buf);    // loopback
+    i2s_recv_page(obj);    // submit a new page for receive   
+}
+
+void main(void)
+{
+    int *ptx_buf;
+    int i,j;
+    
+	alc5651_init();
+	alc5651_init_interface2();	// connect to ALC interface 2
+	
+	// dump register 
+	//alc5651_reg_dump();
+	//alc5651_index_dump();
+
+	// I2S init
+	i2s_obj.channel_num = CH_STEREO;
+	i2s_obj.sampling_rate = SR_44p1KHZ;
+	i2s_obj.word_length = WL_16b;
+	i2s_obj.direction = I2S_DIR_TXRX;    
+	i2s_init(&i2s_obj, I2S_SCLK_PIN, I2S_WS_PIN, I2S_SD_PIN);
+    i2s_set_dma_buffer(&i2s_obj, (char*)i2s_tx_buf, (char*)i2s_rx_buf, \
+        I2S_DMA_PAGE_NUM, I2S_DMA_PAGE_SIZE);
+    i2s_tx_irq_handler(&i2s_obj, (i2s_irq_handler)test_tx_complete, (uint32_t)&i2s_obj);
+    i2s_rx_irq_handler(&i2s_obj, (i2s_irq_handler)test_rx_complete, (uint32_t)&i2s_obj);
+    
+	/* rx need clock, let tx out first */
+	i2s_send_page(&i2s_obj, (uint32_t*)i2s_get_tx_page(&i2s_obj));
+	i2s_recv_page(&i2s_obj);
+	
+	while(1){
+		asm volatile ("nop\n\t");//If run in non-os environment,it needs to add nop operation
+		asm volatile ("nop\n\t");
+		asm volatile ("nop\n\t");
+		asm volatile ("nop\n\t");
+	}
+
+}