前面简单讲解了WM8960语音芯片工作方式,WM8960做master,之前参数配置ADC/DAC采样速率的是44.1K,有点问题,现在改为16K,
参数配置如下:
//WM8960 slave mode // MCLK = 24MHz, SYSCLK = 12.288MHz, // PLL mode is fractional, MCLK div 2 const u16 wm8960_reg_master[]= { 0x0f,0x000, 0x19,0x17e, 0x1a,0x1e1, 0x2f,0x03c, 0x34,0x038, 0x35,0x031, 0x36,0x026, 0x37,0x0e6, 0x04,0x0dd, //ADC/DAC 采样速率12.288/(3*256) = 16KHz 0x08,0x00c, 0x20,0x138, 0x21,0x138, 0x2b,0x000, 0x2c,0x000, 0x00,0x157, 0x01,0x157, 0x05,0x000, 0x06,0x000, 0x07,0x042, //bit6=1, Enable master mode; bit[1:0]=10,I2S Format;bit[3:2]=00,16 bits 0x18,0x004, 0x30,0x000, 0x02,0x163,//179,// //LOUT1 Volume 0x03,0x163,//0x179,//ROUT1 Volume #ifdef DLOOPBACK //不开LOOPBACK 0x09,0x001, #endif 0x22,0x100, //Enable Left DAC to Left Output Mixer 0x25,0x100, //Enable Right DAC to Right Output Mixer #ifdef ALOOPBACK //先关掉内部路径播放 0x2d,0x080, //Left Input Boost Mixer to Left Output Mixer 0x2e,0x080, //Right Input Boost Mixer to Right Output Mixer #endif };
调用I2C函数进行初始化:
uint8_t WM8960_Set_Play_Recorde_Reg(void) { uint8_t i = 0; uint8_t res = 0; res = WM8960_Write_Reg((uint8_t)wm8960_reg_master[0], wm8960_reg_master[1]); if(res != 0) { return res; } Delay_ms(10); for(i=2; i<(sizeof(wm8960_reg_master)/sizeof(u16)); i+=2) { res = WM8960_Write_Reg((uint8_t)wm8960_reg_master[i],wm8960_reg_master[i+1]); } return 0; }
I2C发送函数这里就不贴来了,可以用IO模拟或用库函数
重点讲解下I2S的DMA方式及注意事项:
(1)、首先是I2S 管脚定义:
/** * I2S×ÜÏß´«ÊäÒôƵÊý¾Ý¿ÚÏß * WM8960_LRC -> PB12/I2S2_WS * WM8960_BCLK -> PB13/I2S2_CK * WM8960_ADCDAT -> PB14/I2S2ext_SD * WM8960_DACDAT -> PB15/I2S2_SD * WM8960_MCLK -> PC6/I2S2_MCK */ /* Enable GPIO clock */ void WM8960_I2S_GPIO_Config(void) { GPIO_InitTypeDef GPIO_InitStructure; RCC_AHB1PeriphClockCmd(WM8960_LRC_GPIO_CLK|WM8960_BCLK_GPIO_CLK| \ WM8960_ADCDAT_GPIO_CLK|WM8960_DACDAT_GPIO_CLK| \ WM8960_MCLK_GPIO_CLK, ENABLE); GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_InitStructure.GPIO_Pin = WM8960_LRC_PIN; GPIO_Init(WM8960_LRC_PORT, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = WM8960_BCLK_PIN; GPIO_Init(WM8960_BCLK_PORT, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = WM8960_MCLK_PIN; GPIO_Init(WM8960_MCLK_PORT, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = WM8960_DACDAT_PIN; GPIO_Init(WM8960_DACDAT_PORT, &GPIO_InitStructure); GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; GPIO_InitStructure.GPIO_Pin = WM8960_ADCDAT_PIN; GPIO_Init(WM8960_ADCDAT_PORT, &GPIO_InitStructure); /* Connect pins to I2S peripheral */ GPIO_PinAFConfig(WM8960_LRC_PORT, WM8960_LRC_SOURCE, WM8960_LRC_AF); GPIO_PinAFConfig(WM8960_BCLK_PORT, WM8960_BCLK_SOURCE, WM8960_BCLK_AF); GPIO_PinAFConfig(WM8960_ADCDAT_PORT, WM8960_ADCDAT_SOURCE, WM8960_ADCDAT_AF); GPIO_PinAFConfig(WM8960_DACDAT_PORT, WM8960_DACDAT_SOURCE, WM8960_DACDAT_AF); GPIO_PinAFConfig(WM8960_MCLK_PORT, WM8960_MCLK_SOURCE, WM8960_MCLK_AF); }
(2)、配置I2S 发送,STM32做的从机,所以不需要配置MCLK,当然也不需要输出:
void WM8960_I2Sx_Mode_Config(const uint16_t _usStandard,const uint16_t _usWordLen,const uint32_t _usAudioFreq) { I2S_InitTypeDef I2S_InitStructure; #if 0 //STM32作为从机不需要配置时钟 uint32_t n = 0; FlagStatus status = RESET; /** * For I2S mode, make sure that either: * - I2S PLL is configured using the functions RCC_I2SCLKConfig(RCC_I2S2CLKSource_PLLI2S), * RCC_PLLI2SCmd(ENABLE) and RCC_GetFlagStatus(RCC_FLAG_PLLI2SRDY). */ RCC_I2SCLKConfig(RCC_I2S2CLKSource_PLLI2S); RCC_PLLI2SCmd(ENABLE); for (n = 0; n < 500; n++) { status = RCC_GetFlagStatus(RCC_FLAG_PLLI2SRDY); if (status == 1)break; } #endif /* 打开 I2S2 APB1 时钟 */ RCC_APB1PeriphClockCmd(WM8960_CLK, ENABLE); /* 复位 SPI2 外设到缺省状态 */ SPI_I2S_DeInit(WM8960_I2Sx_SPI); /* I2S2 外设配置 */ /* 配置I2S工作模式 */ I2S_InitStructure.I2S_Mode = I2S_Mode_SlaveTx;//I2S_Mode_MasterTx; /* 接口标准 */ I2S_InitStructure.I2S_Standard = _usStandard; /* 数据格式,16bit */ I2S_InitStructure.I2S_DataFormat = _usWordLen; /* 主时钟模式 */ I2S_InitStructure.I2S_MCLKOutput = I2S_MCLKOutput_Disable;//I2S_MCLKOutput_Enable; /* 音频采样频率 */ I2S_InitStructure.I2S_AudioFreq = _usAudioFreq; I2S_InitStructure.I2S_CPOL = I2S_CPOL_Low; I2S_Init(WM8960_I2Sx_SPI, &I2S_InitStructure); /* 使能 SPI2/I2S2 外设 */ I2S_Cmd(WM8960_I2Sx_SPI, ENABLE); }
(3)、配置I2S接收模式,配置双缓冲模式
void WM8960_I2Sxext_Mode_Config(const uint16_t _usStandard, const uint16_t _usWordLen,const uint32_t _usAudioFreq) { I2S_InitTypeDef I2Sext_InitStructure; /* I2S2 外设配置 */ RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE); /* 复位 SPI2 外设到缺省状态 */ SPI_I2S_DeInit(I2S2ext); I2Sext_InitStructure.I2S_Mode = I2S_Mode_SlaveTx; /* 配置I2S工作模式 注意这里是SlaveTx 而不是Rx,容易误导*/ I2Sext_InitStructure.I2S_Standard = _usStandard; /* 接口标准 */ I2Sext_InitStructure.I2S_DataFormat = _usWordLen; /* 数据格式,16bit */ I2Sext_InitStructure.I2S_MCLKOutput = I2S_MCLKOutput_Disable; /* 主时钟模式 */ I2Sext_InitStructure.I2S_AudioFreq = _usAudioFreq; /* 音频采样频率 */ I2Sext_InitStructure.I2S_CPOL = I2S_CPOL_Low; I2S_Init(I2S2ext, &I2Sext_InitStructure); I2S_FullDuplexConfig(I2S2ext, &I2Sext_InitStructure); //可以进入函数中看到,当I2S_Mode == I2S_Mode_SlaveTx时,选择的是tmp = I2S_Mode_SlaveRx; /* 使能 SPI2/I2S2 外设 */ I2S_Cmd(I2S2ext, ENABLE); SPI_I2S_DMACmd(I2S2ext,SPI_I2S_DMAReq_Rx,ENABLE);//SPI2 RX DMA请求使能. }
这里注意下I2S模式选的是I2S_Mode_SlaceTx,你可能会觉得这个地方配置错了,我觉得是个坑。
I2Sext_InitStructure.I2S_Mode = I2S_Mode_SlaveTx; /* 配置I2S工作模式 注意这里是SlaveTx 而不是Rx,容易误导*/
其实不是,进到void I2S_FullDuplexConfig(SPI_TypeDef* I2Sxext, I2S_InitTypeDef* I2S_InitStruct) 这个函数里头,发现这代码是这样写的,最终是temp=I2S_Mode_SlaveRx;
/* Get the mode to be configured for the extended I2S */ if ((I2S_InitStruct->I2S_Mode == I2S_Mode_MasterTx) || (I2S_InitStruct->I2S_Mode == I2S_Mode_SlaveTx)) { tmp = I2S_Mode_SlaveRx; } else { if ((I2S_InitStruct->I2S_Mode == I2S_Mode_MasterRx) || (I2S_InitStruct->I2S_Mode == I2S_Mode_SlaveRx)) { tmp = I2S_Mode_SlaveTx; } }
(3)、配置DMA双缓冲发送和发送完产生的中断函数:
void WM8960_I2Sx_TX_DMA_Init(const uint16_t *buffer0,const uint16_t *buffer1,const uint32_t num) { NVIC_InitTypeDef NVIC_InitStructure; DMA_InitTypeDef DMA_InitStructure; RCC_AHB1PeriphClockCmd(WM8960_I2Sx_DMA_CLK,ENABLE);//DMA1时钟使能 DMA_DeInit(WM8960_I2Sx_TX_DMA_STREAM); while (DMA_GetCmdStatus(WM8960_I2Sx_TX_DMA_STREAM) != DISABLE){}//等待DMA1_Stream4可配置 DMA_ClearITPendingBit(WM8960_I2Sx_TX_DMA_STREAM,DMA_IT_FEIF4|DMA_IT_DMEIF4|DMA_IT_TEIF4|DMA_IT_HTIF4|DMA_IT_TCIF4);//清空DMA1_Stream4上所有中断标志 /* 配置 DMA Stream */ DMA_InitStructure.DMA_Channel = WM8960_I2Sx_TX_DMA_CHANNEL; //通道0 SPIx_TX通道 DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&WM8960_I2Sx_SPI->DR;//外设地址为:(u32)&SPI2->DR DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)buffer0;//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(WM8960_I2Sx_TX_DMA_STREAM, &DMA_InitStructure);//初始化DMA Stream DMA_DoubleBufferModeConfig(WM8960_I2Sx_TX_DMA_STREAM,(uint32_t)buffer0,DMA_Memory_0);//双缓冲模式配置 DMA_DoubleBufferModeConfig(WM8960_I2Sx_TX_DMA_STREAM,(uint32_t)buffer1,DMA_Memory_1);//双缓冲模式配置 DMA_DoubleBufferModeCmd(WM8960_I2Sx_TX_DMA_STREAM,ENABLE);//双缓冲模式开启 DMA_ITConfig(WM8960_I2Sx_TX_DMA_STREAM,DMA_IT_TC,ENABLE);//开启传输完成中断 SPI_I2S_DMACmd(WM8960_I2Sx_SPI,SPI_I2S_DMAReq_Tx,ENABLE);//SPI2 TX DMA请求使能. DMA_Cmd(WM8960_I2Sx_TX_DMA_STREAM,DISABLE); NVIC_InitStructure.NVIC_IRQChannel = WM8960_I2Sx_TX_DMA_STREAM_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;//抢占优先级1 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;//子优先级2 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//使能外部中断通道 NVIC_Init(&NVIC_InitStructure);//配置 } void WM8960_I2Sx_TX_DMA_STREAM_IRQFUN(void) { if(DMA_GetITStatus(WM8960_I2Sx_TX_DMA_STREAM,WM8960_I2Sx_TX_DMA_IT_TCIF)==SET)//DMA传输完成标志 { DMA_ClearITPendingBit(WM8960_I2Sx_TX_DMA_STREAM,WM8960_I2Sx_TX_DMA_IT_TCIF);//清DMA传输完成标准 if(WM8960_I2Sx_TX_DMA_STREAM->CR&(1<<19)) //当前使用Memory1数据 { bufflag=0; //可以将数据读取到缓冲区0 } else //当前使用Memory0数据 { bufflag=1; //可以将数据读取到缓冲区1 } Isread_tx ++; } }
(4)、配置DMA双缓冲接收和接收中断函数:
void WM8960_I2Sxext_RX_DMA_Init(const uint16_t *buffer0,const uint16_t *buffer1,const uint32_t num) { NVIC_InitTypeDef NVIC_InitStructure1; DMA_InitTypeDef DMA_InitStructure1; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1,ENABLE);//DMA1时钟使能 DMA_DeInit(DMA1_Stream3); while (DMA_GetCmdStatus(DMA1_Stream3) != DISABLE){}//等待DMA1_Stream3可配置 DMA_ClearITPendingBit(DMA1_Stream3,DMA_IT_FEIF3|DMA_IT_DMEIF3|DMA_IT_TEIF3|DMA_IT_HTIF3|DMA_IT_TCIF3);//清空DMA1_Stream3上所有中断标志 /* 配置 DMA Stream */ DMA_InitStructure1.DMA_Channel = DMA_Channel_3; //通道0 SPIx_TX通道 DMA_InitStructure1.DMA_PeripheralBaseAddr = (uint32_t)&WM8960_I2Sx_ext->DR;//外设地址为:(u32)&SPI2->DR DMA_InitStructure1.DMA_Memory0BaseAddr = (uint32_t)buffer0;//DMA 存储器0地址 DMA_InitStructure1.DMA_DIR = DMA_DIR_PeripheralToMemory;//外设到存储器模式 DMA_InitStructure1.DMA_BufferSize = num;//数据传输量 DMA_InitStructure1.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外设非增量模式 DMA_InitStructure1.DMA_MemoryInc = DMA_MemoryInc_Enable;//存储器增量模式 DMA_InitStructure1.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//外设数据长度:16位 DMA_InitStructure1.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//存储器数据长度:16位 DMA_InitStructure1.DMA_Mode = DMA_Mode_Circular;// 使用循环模式 DMA_InitStructure1.DMA_Priority = DMA_Priority_VeryHigh; DMA_InitStructure1.DMA_FIFOMode = DMA_FIFOMode_Disable; //不使用FIFO模式 DMA_InitStructure1.DMA_FIFOThreshold = DMA_FIFOThreshold_1QuarterFull; DMA_InitStructure1.DMA_MemoryBurst = DMA_MemoryBurst_Single;//外设突发单次传输 DMA_InitStructure1.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;//存储器突发单次传输 DMA_Init(DMA1_Stream3, &DMA_InitStructure1);//初始化DMA Stream DMA_DoubleBufferModeConfig(DMA1_Stream3,(uint32_t)buffer0,DMA_Memory_0);//双缓冲模式配置 DMA_DoubleBufferModeConfig(DMA1_Stream3,(uint32_t)buffer1,DMA_Memory_1);//双缓冲模式配置 DMA_DoubleBufferModeCmd(DMA1_Stream3,ENABLE);//双缓冲模式开启 DMA_ITConfig(DMA1_Stream3,DMA_IT_TC,ENABLE);//开启传输完成中断 DMA_Cmd(DMA1_Stream3,DISABLE); NVIC_InitStructure1.NVIC_IRQChannel = DMA1_Stream3_IRQn; NVIC_InitStructure1.NVIC_IRQChannelPreemptionPriority = 0;//抢占优先级0 NVIC_InitStructure1.NVIC_IRQChannelSubPriority = 0;//子优先级2 NVIC_InitStructure1.NVIC_IRQChannelCmd = ENABLE;//使能外部中断通道 NVIC_Init(&NVIC_InitStructure1);//配置 } void DMA1_Stream3_IRQHandler(void) { if(DMA_GetITStatus(DMA1_Stream3,DMA_IT_TCIF3)==SET) { DMA_ClearITPendingBit(DMA1_Stream3,DMA_IT_TCIF3); if(DMA1_Stream3->CR&(1<<19)) //当前使用Memory1数据 { bufflag=1; } else //当前使用Memory0数据 { bufflag=0; } Isread_rx++; // DMA传输完成标志 } }
(5)、主函数中调用测试语音录音和播放:
extern u8 Isread_tx; extern u8 Isread_rx; extern uint16_t adudio_buffer0[]; extern uint16_t adudio_buffer1[]; extern uint16_t ADUDIO_BUFFER_SIZE; #define DMA_Point_to_Memory0 0 #define DMA_Point_to_Memory1 1 void Audio_Set(void) { WM8960_I2S_GPIO_Config(); if(WM8960_Set_Play_Recorde_Reg()) { printf("WM8960 Init Fail!!!\r\n"); } else printf("WM8960 Init Success!!!\r\n"); WM8960_I2Sx_Mode_Config(I2S_Standard_Phillips,I2S_DataFormat_16b,I2S_AudioFreq_16k); WM8960_I2Sx_TX_DMA_Init(adudio_buffer1,adudio_buffer0,ADUDIO_BUFFER_SIZE);//注意数量大小就是一个缓冲区的大小,而不是两个缓冲区大小之和 WM8960_I2Sxext_Mode_Config(I2S_Standard_Phillips,I2S_DataFormat_16b,I2S_AudioFreq_16k); WM8960_I2Sxext_RX_DMA_Init(adudio_buffer1,adudio_buffer0,ADUDIO_BUFFER_SIZE); } void Audio_Play_Recorde(void) { Audio_Set(); while(1) { //播放音乐 if(KEYL==0) { Delay_ms(1000); WM8960_I2S_Play_Start(); } if(Isread_tx == 2) { WM8960_I2S_Play_Stop(); Isread_tx = 0; printf("Play Complete!!!\r\n"); printf("Please Recorde!!!\r\n"); } if(KEYR==0) { Delay_ms(1000); memset(adudio_buffer1,0,sizeof(uint16_t)*ADUDIO_BUFFER_SIZE); memset(adudio_buffer0,0,sizeof(uint16_t)*ADUDIO_BUFFER_SIZE); printf("Clear Buffer Complete!!!\r\n"); } //录音 if(KEYM==0) { Delay_ms(1000); WM8960_I2Sxext_Recorde_Start(); } if(Isread_rx == 2) { WM8960_I2Sxext_Recorde_Stop(); Isread_rx = 0; printf("Recorde Complete!!!\r\n"); printf("Please Play!!!\r\n"); } // // if(bufflag==DMA_Point_to_Memory0) //说明Memory1中的数据可以拷贝 // { // rx_flag = 2; // memcpy(tx_buffer0,rx_buffer0,sizeof(u8)*BUFFER_SIZE); // } // if(bufflag==DMA_Point_to_Memory1)//说明Memory0中的数据可以拷贝 // { // rx_flag = 2; // memcpy(tx_buffer1,rx_buffer1,sizeof(u8)*BUFFER_SIZE); // } } }