Arduino 开发的 CH32V307 IIS 音频输出测试

这次介绍的是如何在 CH32V307上通过 Arduino 编程,从 IIS 接口输出一个正弦波然后通过 NS4168 播放出来。关于 NS4168的介绍,可以在【参考1】看到。

线路方面:

B12(I2S2_WS)连接到 LRCLK

B13(I2S2_CK) 连接到 BCKL

B15(I2S2_SD)连接到  SDAT

 同时特别提醒 NS4168 的CTRL 需要连接 3.3V

之后,给 Ch32v307烧录如下代码:

//#include "ch32v30x_spi.h"
/* Global Variable */
#define  Len    48*16*2
u16 I2S2_Tx[Len] = {
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-23107,-23107,-25925,-25925,-29141,-29141,-32698,-32698,28998,28998,24943,24943,20741,20741,16465,16465,12188,12188,7982,7982,3920,3920,71,71,-3498,-3498,-6727,-6727,-9561,-9561,-11952,-11952,-13857,-13857,-15245,-15245,-16092,-16092,-16383,-16383,-16114,-16114,-15288,-15288,-13921,-13921,-12035,-12035,-9663,-9663,-6845,-6845,-3630,-3630,-73,-73,3766,3766,7821,7821,12022,12022,16298,16298,
20576,20576,24782,24782,28844,28844,32693,32693,-29273,-29273,-26043,-26043,-23209,-23209,-20818,-20818,-18913,-18913,-17524,-17524,-16677,-16677,-16385,-16385,-16654,-16654,-17479,-17479,-18846,-18846,-20732,-20732,-23104,-23104,-25921,-25921,-29136,-29136,-32693,-32693,29004,29004,24949,24949,20747,20747,16471,16471,12194,12194,7988,7988,3925,3925,76,76,-3493,-3493,-6723,-6723,-9558,-9558,-11949,-11949,
-13855,-13855,-15243,-15243,-16091,-16091,-16383,-16383,-16115,-16115,-15290,-15290,-13923,-13923,-12038,-12038,-9667,-9667,-6850,-6850,-3635,-3635,-78,-78,3760,3760,7815,7815,12016,12016,16292,16292,20570,20570,24776,24776,28838,28838,32688,32688,-29278,-29278,-26048,-26048,-23213,-23213,-20821,-20821,-18915,-18915,-17526,-17526,-16678,-16678,-16385,-16385,-16654,-16654,-17478,-17478,-18844,-18844,-20729,-20729,
-23100,-23100,-25917,-25917,-29131,-29131,-32688,-32688,29009,29009,24955,24955,20753,20753,16477,16477,12200,12200,7994,7994,3931,3931,82,82,-3488,-3488,-6719,-6719,-9554,-9554,-11946,-11946,-13852,-13852,-15242,-15242,-16090,-16090,-16383,-16383,-16115,-16115,-15291,-15291,-13926,-13926,-12041,-12041,-9670,-9670,-6854,-6854,-3640,-3640,-83,-83,3754,3754,7809,7809,12010,12010,
};

//#define  Len    10

//u16 I2S2_Tx[Len] = { 0x1111, 0x2222, 0x3333, 0x4444, 0x5555, 0x6666, 0x7777, 0x8888, 0x9999, 0xAAAA };

/*********************************************************************
 * @fn      I2S2_Init
 *
 * @brief   Init I2S2
 *
 * @return  none
 */
void I2S2_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure={0};
    I2S_InitTypeDef  I2S_InitStructure={0};

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_15;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOC, &GPIO_InitStructure);

    I2S_InitStructure.I2S_Mode = I2S_Mode_MasterTx;
    I2S_InitStructure.I2S_Standard = I2S_Standard_Phillips;
    I2S_InitStructure.I2S_DataFormat = I2S_DataFormat_16b;
    I2S_InitStructure.I2S_MCLKOutput = I2S_MCLKOutput_Enable;//I2S_MCLKOutput_Disable;
    I2S_InitStructure.I2S_AudioFreq = I2S_AudioFreq_48k;
    I2S_InitStructure.I2S_CPOL = I2S_CPOL_High;
    I2S_Init(SPI2, &I2S_InitStructure);

    SPI_I2S_DMACmd( SPI2, SPI_I2S_DMAReq_Tx, ENABLE );
    I2S_Cmd(SPI2, ENABLE);
}

/*********************************************************************
 * @fn      DMA_Tx_Init
 *
 * @brief   Initializes the DMAy Channelx configuration.
 *
 * @param   DMA_CHx - x can be 1 to 7.
 *          ppadr - Peripheral base address.
 *          memadr - Memory base address.
 *          bufsize - DMA channel buffer size.
 *
 * @return  none
 */
void DMA_Tx_Init( DMA_Channel_TypeDef* DMA_CHx, u32 ppadr, u32 memadr, u16 bufsize)
{
    DMA_InitTypeDef DMA_InitStructure={0};

    RCC_AHBPeriphClockCmd( RCC_AHBPeriph_DMA1, ENABLE );

    DMA_DeInit(DMA_CHx);

    DMA_InitStructure.DMA_PeripheralBaseAddr = ppadr;
    DMA_InitStructure.DMA_MemoryBaseAddr = memadr;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
    DMA_InitStructure.DMA_BufferSize = bufsize;
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
    DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
    DMA_InitStructure.DMA_Priority = DMA_Priority_High;
    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
    DMA_Init( DMA_CHx, &DMA_InitStructure );
}

void setup() {
    SPI_I2S_DeInit(SPI2);

    I2S2_Init();


}

void loop() {
    DMA_Tx_Init( DMA1_Channel5, (u32)&SPI2->DATAR, (u32)I2S2_Tx, Len);  
    DMA_Cmd( DMA1_Channel5, ENABLE );
    while( (!DMA_GetFlagStatus(DMA1_FLAG_TC5))){};
    DMA_Cmd( DMA2_Channel1, DISABLE );
}

即可工作。
I2S2_Tx 里面定义的是一个正弦波数据,通过如下C# 代码生成:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


namespace SinAudio
{
    class Program
    {
        public const int LOOPS = 16;

        static void Main(string[] args)
        {
            double sin,cos;
            for (int i = 0; i < LOOPS * 48; i++) {
                sin = (0.5 + Math.Sin(i * 2 * 3.1415 / 48))* 65535/2;
                //cos = (0.5 + Math.Cos(i * 2 * 3.1415 / 48)) * 65535 / 2;
                Console.Write("{0},{1},", (Int16)sin, (Int16)sin);// (Int16)() * );
                if (i % 32 == 0) {
                    Console.WriteLine("");
                }
            }
            Console.ReadLine();
        }
    }
}

数据可以看成是 48K 16Bits 采样结果,数据是int16 (负数使用补码形式表示)

工作的测试视频如下:

https://www.bilibili.com/video/BV1Yi421m7n8/?share_source=copy_web&vd_source=5ca375392c3dd819bfc37d4672cb6d54