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add examples
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pvvx
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15
RTL00_SDKV35a/example_sources/i2s_tx_and_rx_only/readme.txt
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15
RTL00_SDKV35a/example_sources/i2s_tx_and_rx_only/readme.txt
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Example Description
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This example describes how to use i2s by using mbed extend api
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Using TX only and RX only mode.
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RX will fill buffer until full then switching to TX only mode to play buffer content.
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1.Plug ALC5651 shield to Ameba HDK
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2.Run the main function.
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3.Plug earphone to Green phone jack
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4.Plug audio source to Red phone jack
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183
RTL00_SDKV35a/example_sources/i2s_tx_and_rx_only/src/alc5651.c
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183
RTL00_SDKV35a/example_sources/i2s_tx_and_rx_only/src/alc5651.c
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#include <stdio.h>
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#include "PinNames.h"
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#include "basic_types.h"
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#include "diag.h"
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#include <osdep_api.h>
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#include "i2c_api.h"
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#include "pinmap.h"
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//#define I2C_MTR_SDA PC_4//PB_3
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//#define I2C_MTR_SCL PC_5//PB_2
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#define I2C_MTR_SDA PB_3
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#define I2C_MTR_SCL PB_2
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#define I2C_BUS_CLK 100000 //hz
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#define I2C_ALC5651_ADDR (0x34/2)
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#define RT5651_PRIV_INDEX 0x6a
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#define RT5651_PRIV_DATA 0x6c
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#if defined (__ICCARM__)
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i2c_t alc5651_i2c;
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#else
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volatile i2c_t alc5651_i2c;
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#define printf DBG_8195A
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#endif
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static void alc5651_delay(void)
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{
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int i;
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i=10000;
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while (i) {
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i--;
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asm volatile ("nop\n\t");
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}
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}
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void alc5651_reg_write(unsigned int reg, unsigned int value)
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{
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char buf[4];
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buf[0] = (char)reg;
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buf[1] = (char)(value>>8);
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buf[2] = (char)(value&0xff);
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i2c_write(&alc5651_i2c, I2C_ALC5651_ADDR, &buf[0], 3, 1);
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alc5651_delay();
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}
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void alc5651_reg_read(unsigned int reg, unsigned int *value)
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{
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int tmp;
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char *buf = (char*)&tmp;
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buf[0] = (char)reg;
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i2c_write(&alc5651_i2c, I2C_ALC5651_ADDR, &buf[0], 1, 1);
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alc5651_delay();
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buf[0] = 0xaa;
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buf[1] = 0xaa;
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i2c_read(&alc5651_i2c, I2C_ALC5651_ADDR, &buf[0], 2, 1);
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alc5651_delay();
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*value= ((buf[0]&0xFF)<<8)|(buf[1]&0xFF);
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}
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void alc5651_index_write(unsigned int reg, unsigned int value)
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{
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alc5651_reg_write(RT5651_PRIV_INDEX, reg);
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alc5651_reg_write(RT5651_PRIV_DATA, value);
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}
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void alc5651_index_read(unsigned int reg, unsigned int *value)
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{
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alc5651_reg_write(RT5651_PRIV_INDEX, reg);
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alc5651_reg_read(RT5651_PRIV_DATA, value);
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}
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void alc5651_reg_dump(void)
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{
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int i;
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unsigned int value;
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printf("alc5651 codec reg dump\n\r");
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printf("------------------------\n\r");
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for(i=0;i<=0xff;i++){
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alc5651_reg_read(i, &value);
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printf("%02x : %04x\n\r", i, (unsigned short)value);
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}
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printf("------------------------\n\r");
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}
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void alc5651_index_dump(void)
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{
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int i;
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unsigned int value;
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printf("alc5651 codec index dump\n\r");
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printf("------------------------\n\r");
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for(i=0;i<=0xff;i++){
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alc5651_index_read(i, &value);
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printf("%02x : %04x\n\r", i, (unsigned short)value);
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}
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printf("------------------------\n\r");
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}
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void alc5651_init(void)
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{
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i2c_init(&alc5651_i2c, I2C_MTR_SDA, I2C_MTR_SCL);
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i2c_frequency(&alc5651_i2c, I2C_BUS_CLK);
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}
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void alc5651_set_word_len(int len_idx) // interface2
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{
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// 0: 16 1: 20 2: 24 3: 8
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unsigned int val;
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alc5651_reg_read(0x71,&val);
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val &= (~(0x3<<2));
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val |= (len_idx<<2);
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alc5651_reg_write(0x71,val);
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alc5651_reg_read(0x70,&val);
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val &= (~(0x3<<2));
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val |= (len_idx<<2);
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alc5651_reg_write(0x70,val);
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}
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void alc5651_init_interface1(void)
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{
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alc5651_reg_write(0x00,0x0021);
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alc5651_reg_write(0x63,0xE8FE);
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alc5651_reg_write(0x61,0x5800);
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alc5651_reg_write(0x62,0x0C00);
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alc5651_reg_write(0x73,0x0000);
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alc5651_reg_write(0x2A,0x4242);
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alc5651_reg_write(0x45,0x2000);
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alc5651_reg_write(0x02,0x4848);
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alc5651_reg_write(0x8E,0x0019);
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alc5651_reg_write(0x8F,0x3100);
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alc5651_reg_write(0x91,0x0E00);
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alc5651_index_write(0x3D,0x3E00);
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alc5651_reg_write(0xFA,0x0011);
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alc5651_reg_write(0x83,0x0800);
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alc5651_reg_write(0x84,0xA000);
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alc5651_reg_write(0xFA,0x0C11);
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alc5651_reg_write(0x64,0x4010);
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alc5651_reg_write(0x65,0x0C00);
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alc5651_reg_write(0x61,0x5806);
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alc5651_reg_write(0x62,0xCC00);
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alc5651_reg_write(0x3C,0x004F);
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alc5651_reg_write(0x3E,0x004F);
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alc5651_reg_write(0x27,0x3820);
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alc5651_reg_write(0x77,0x0000);
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}
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void alc5651_init_interface2(void)
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{
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alc5651_reg_write(0x00,0x0021);
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alc5651_reg_write(0x63,0xE8FE);
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alc5651_reg_write(0x61,0x5800);
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alc5651_reg_write(0x62,0x0C00);
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alc5651_reg_write(0x73,0x0000);
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alc5651_reg_write(0x2A,0x4242);
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alc5651_reg_write(0x45,0x2000);
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alc5651_reg_write(0x02,0x4848);
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alc5651_reg_write(0x8E,0x0019);
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alc5651_reg_write(0x8F,0x3100);
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alc5651_reg_write(0x91,0x0E00);
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alc5651_index_write(0x3D,0x3E00);
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alc5651_reg_write(0xFA,0x0011);
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alc5651_reg_write(0x83,0x0800);
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alc5651_reg_write(0x84,0xA000);
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alc5651_reg_write(0xFA,0x0C11);
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alc5651_reg_write(0x64,0x4010);
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alc5651_reg_write(0x65,0x0C00);
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alc5651_reg_write(0x61,0x5806);
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alc5651_reg_write(0x62,0xCC00);
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alc5651_reg_write(0x3C,0x004F);
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alc5651_reg_write(0x3E,0x004F);
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alc5651_reg_write(0x28,0x3030);
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alc5651_reg_write(0x2F,0x0080);
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}
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94
RTL00_SDKV35a/example_sources/i2s_tx_and_rx_only/src/main.c
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RTL00_SDKV35a/example_sources/i2s_tx_and_rx_only/src/main.c
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/* This is RX only and TX only example */
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#include "FreeRTOS.h"
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#include "task.h"
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#include "diag.h"
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#include "main.h"
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#include "i2s_api.h"
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/**
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* @brief Main program.
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* @param None
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* @retval None
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*/
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#include "alc5651.c"
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i2s_t i2s_obj;
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#define I2S_DMA_PAGE_SIZE 768 // 2 ~ 4096
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#define I2S_DMA_PAGE_NUM 4 // Vaild number is 2~4
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u8 i2s_tx_buf[I2S_DMA_PAGE_SIZE*I2S_DMA_PAGE_NUM];
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u8 i2s_rx_buf[I2S_DMA_PAGE_SIZE*I2S_DMA_PAGE_NUM];
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#define RECV_PAGE_NUM 50
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u8 recv_buf[I2S_DMA_PAGE_SIZE*RECV_PAGE_NUM];
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#define I2S_SCLK_PIN PC_1
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#define I2S_WS_PIN PC_0
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#define I2S_SD_PIN PC_2
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u32 count = 0;
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void test_tx_complete(void *data, char *pbuf)
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{
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i2s_t *obj = (i2s_t *)data;
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int *ptx_buf;
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if(count < RECV_PAGE_NUM){
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ptx_buf = i2s_get_tx_page(obj);
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_memcpy((void*)ptx_buf, (void*)&recv_buf[I2S_DMA_PAGE_SIZE*count], I2S_DMA_PAGE_SIZE);
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i2s_send_page(obj, (uint32_t*)ptx_buf);
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count++;
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}else{
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count = 0;
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i2s_set_direction(obj, I2S_DIR_RX);
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i2s_recv_page(obj);
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}
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}
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void test_rx_complete(void *data, char* pbuf)
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{
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i2s_t *obj = (i2s_t *)data;
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int *ptx_buf;
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if(count < RECV_PAGE_NUM){
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_memcpy((void*)&recv_buf[I2S_DMA_PAGE_SIZE*count], (void*)pbuf, I2S_DMA_PAGE_SIZE);
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count++;
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i2s_recv_page(obj);
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}else{
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count = 1;
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i2s_set_direction(obj, I2S_DIR_TX);
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ptx_buf = i2s_get_tx_page(obj);
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_memcpy((void*)ptx_buf, (void*)recv_buf, I2S_DMA_PAGE_SIZE);
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i2s_send_page(obj, (uint32_t*)ptx_buf); // loopback
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}
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}
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void main(void)
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{
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int *ptx_buf;
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int i,j;
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alc5651_init();
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alc5651_init_interface2(); // connect to ALC interface 2
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// dump register
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//alc5651_reg_dump();
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//alc5651_index_dump();
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// I2S init
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i2s_obj.channel_num = CH_MONO;
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i2s_obj.sampling_rate = SR_16KHZ;
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i2s_obj.word_length = WL_16b;
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i2s_obj.direction = I2S_DIR_RX;
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i2s_init(&i2s_obj, I2S_SCLK_PIN, I2S_WS_PIN, I2S_SD_PIN);
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i2s_set_dma_buffer(&i2s_obj, (char*)i2s_tx_buf, (char*)i2s_rx_buf, \
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I2S_DMA_PAGE_NUM, I2S_DMA_PAGE_SIZE);
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i2s_tx_irq_handler(&i2s_obj, (i2s_irq_handler)test_tx_complete, (uint32_t)&i2s_obj);
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i2s_rx_irq_handler(&i2s_obj, (i2s_irq_handler)test_rx_complete, (uint32_t)&i2s_obj);
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i2s_recv_page(&i2s_obj);
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while(1);
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}
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