音乐播放器课程设计报告

DMA_InitStructure.DMA_Memory0BaseAddr = (u32)buf0;//DMA 存储器0地址 DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;//存储器到外设模式 DMA_InitStructure.DMA_BufferSize = num;//数据传输量

DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外设非增量模式

DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//存储器增量模式 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//外设数据长度:16位

DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//存储器数据长度：16位

DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;// 使用循环模式 DMA_InitStructure.DMA_Priority = DMA_Priority_High;//高优先级

DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; //不使用FIFO模式 DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_1QuarterFull; DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;//外设突发单次传输

DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;//存储器突发单次传输

DMA_Init(DMA1_Stream4, &DMA_InitStructure);//初始化DMA Stream

DMA_DoubleBufferModeConfig(DMA1_Stream4,(u32)buf1,DMA_Memory_0);//双缓冲模式配置

DMA_DoubleBufferModeCmd(DMA1_Stream4,ENABLE);//双缓冲模式开启 DMA_ITConfig(DMA1_Stream4,DMA_IT_TC,ENABLE);//开启传输完成中断 NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream4_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;//抢占优先级0 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;//子优先级0

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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//使能外部中断通道 NVIC_Init(&NVIC_InitStructure);//配置 }

//I2S DMA回调函数指针

void (*i2s_tx_callback)(void); //TX回调函数 //DMA1_Stream4中断服务函数 void DMA1_Stream4_IRQHandler(void) {

if(DMA_GetITStatus(DMA1_Stream4,DMA_IT_TCIF4)==SET)////DMA1_Stream4,传输完成标志

{

DMA_ClearITPendingBit(DMA1_Stream4,DMA_IT_TCIF4);

i2s_tx_callback(); //执行回调函数,读取数据等操作在这里面处理 }

//I2S开始播放

void I2S_Play_Start(void) { }

//关闭I2S播放

void I2S_Play_Stop(void) {

DMA_Cmd(DMA1_Stream4,DISABLE);//关闭DMA,结束播放

}

DMA_Cmd(DMA1_Stream4,ENABLE);//开启DMA TX传输,开始播放

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}

wm8978代码： #include \#include \#include \

static u16 WM8978_REGVAL_TBL[58]= { };

//WM8978初始化 //返回值:0,初始化正常 // 其他,错误代码 u8 WM8978_Init(void) {

u8 res;

GPIO_InitTypeDef GPIO_InitStructure;

0X0000,0X0000,0X0000,0X0000,0X0050,0X0000,0X0140,0X0000, 0X0000,0X0000,0X0000,0X00FF,0X00FF,0X0000,0X0100,0X00FF, 0X00FF,0X0000,0X012C,0X002C,0X002C,0X002C,0X002C,0X0000, 0X0032,0X0000,0X0000,0X0000,0X0000,0X0000,0X0000,0X0000, 0X0038,0X000B,0X0032,0X0000,0X0008,0X000C,0X0093,0X00E9, 0X0000,0X0000,0X0000,0X0000,0X0003,0X0010,0X0010,0X0100, 0X0100,0X0002,0X0001,0X0001,0X0039,0X0039,0X0039,0X0039, 0X0001,0X0001

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RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB|RCC_AHB1Periph_GPIOC, ENABLE); //使能外设GPIOB,GPIOC时

//PB12/13 复用功能输出

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//复用功能 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//推挽 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//上拉 GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化

//PC2/PC3/PC6复用功能输出

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3|GPIO_Pin_6;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//复用功能 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//推挽 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//上拉 GPIO_Init(GPIOC, &GPIO_InitStructure);//初始化

GPIO_PinAFConfig(GPIOB,GPIO_PinSource12,GPIO_AF_SPI2); //PB12,AF5 I2S_LRCK

GPIO_PinAFConfig(GPIOB,GPIO_PinSource13,GPIO_AF_SPI2); //PB13,AF5 I2S_SCLK

GPIO_PinAFConfig(GPIOC,GPIO_PinSource3,GPIO_AF_SPI2); I2S_DACDATA

GPIO_PinAFConfig(GPIOC,GPIO_PinSource6,GPIO_AF_SPI2); I2S_MCK

//PC3 ,AF5

//PC6 ,AF5

GPIO_PinAFConfig(GPIOC,GPIO_PinSource2,GPIO_AF6_SPI2); //PC2 ,AF6 I2S_ADCDATA I2S2ext_SD是AF6!!!

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