(6) I2S_CPOL:空闲状态的CK线电平,可选高电平或低电平,它设定SPI_I2SCFGR寄存器CKPOL位的值。一般设置为电平即可。38.6 录音与回放实验WAV格式文件在现阶段一般以无损音乐格式存在,音质可以达到CD格式标准。结合上一章SD卡操作内容,本实验通过FatFS文件系统函数从SD卡读取WAV格式文件数据,然后通过I2S接口将音频数据...
I2S_InitStructure.I2S_AudioFreq = _I2S_AudioFreq_8k; /*I2S clock steady state is low level */ I2S_InitStructure.I2S_CPOL = I2S_CPOL_Low; I2S_Init(SPI2, &I2S_InitStructure); SPI_I2S_ITConfig(SPI2, SPI_I2S_IT_RXNE, DISABLE); I2S_Cmd(SPI2, ENABLE); SPI_I2S_ITConfig(SPI2, SPI_I2S...
I2S_InitStructure.I2S_CPOL = I2S_CPOL_Low;I2S_InitStructure.I2S_Mode = I2S_Mode_MasterTx;I2S_...
SPI_InitStruct.SPI_CPOL=SPI_CPOL_Low;/*Theclockislowinidlestate.*/ SPI_InitStruct.SPI_CPHA=SPI_CPHA_1Edge;/*Datasamplingstartsfromthefirstclockedge*/ SPI_InitStruct.SPI_NSS=SPI_NSS_Soft; /*SPIdataedgeadjustinfastspeedmode*/ SPI_InitStruct.SPI_BaudRatePrescaler=(SPI_BaudRatePrescaler_TypeDef...
I2S_InitStructure.I2S_CPOL = I2S_CPOL_Low;I2S_Init(SPI3, &I2S_InitStructure);/* Enable SPI3 ...
I2S_InitStructure.I2S_CPOL = I2S_CPOL_Low; I2S_Init(SPI3, &I2S_InitStructure); } SPI_DMACmd(SPI3, ENABLE); I2S_Cmd(SPI3, ENABLE); } (1)I2S_Mode:I2S 模式选择,可选主机发送、主机接收、从机发送以及从机接收模式,它设定SPI_I2S_GCTL寄存器MODE位的值。一般设置 MM32 控制器为主机模式,当播放...
I2S_AudioFreq = _usAudioFreq; I2Sext_InitStructure.I2S_CPOL = I2S_CPOLLow; I2S_FullDuplexConfig(WM8978_I2Sx_ext, &I2Sext_); /* 使能 SPI2/I2S2 外设 */ I2S_Cmd(WM8978_I2Sx_ext, ENABLE); } I2Sxext_Mode_Config函数用于配置I2S全双工模式,使用扩展I2S功能方便数据处理这对实现录音...
g_i2sHandle.Init.CPOL = I2S_CPOL_LOW; // 空闲状态，时钟为低电平 g_i2sHandle.Init.FirstBit...
I2S_InitStructure.I2S_CPOL = I2S_CPOL_Low;I2S_InitStructure.I2S_Mode = I2S_Mode_MasterTx;I2S_...
{ hi2s3.Instance = SPI3; hi2s3.Init.Mode = I2S_MODE_MASTER_TX; hi2s3.Init.Standard = I2S_STANDARD_PHILIPS; hi2s3.Init.DataFormat = I2S_DATAFORMAT_16B; hi2s3.Init.MCLKOutput = I2S_MCLKOUTPUT_ENABLE; hi2s3.Init.AudioFreq = I2S_AUDIOFREQ_16K; hi2s3.Init.CPOL = I2S_CPOL_LOW;...