本帖最后由 dreamc 于 2014-7-14 23:25 编辑
GPIO Init
- GPIO_InitTypeDef GPIO_InitStructure;
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 |GPIO_Pin_14 | GPIO_Pin_15;//WS CK SD
- 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_Init(GPIOB, &GPIO_InitStructure);
- GPIO_PinAFConfig(GPIOB, GPIO_PinSource12, GPIO_AF_SPI2);
- GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_SPI2);
- GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_SPI2);
- GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_I2S2ext);
-
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; //MCLK
- 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_Init(GPIOC, &GPIO_InitStructure);
- GPIO_PinAFConfig(GPIOC, GPIO_PinSource6, GPIO_AF_SPI2);
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I2S Init
- I2S_InitTypeDef I2S_InitStructure;
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
- SPI_I2S_DeInit(SPI2);
-
- I2S_StructInit(&I2S_InitStructure);
- I2S_InitStructure.I2S_AudioFreq = I2S_AudioFreq_8k;;
- I2S_InitStructure.I2S_Standard = I2S_Standard_MSB;
- I2S_InitStructure.I2S_DataFormat = I2S_DataFormat_16b;
- I2S_InitStructure.I2S_CPOL = I2S_CPOL_Low;
- I2S_InitStructure.I2S_Mode = I2S_Mode_MasterTx;
- I2S_InitStructure.I2S_MCLKOutput = I2S_MCLKOutput_Enable;
- I2S_Init(SPI2, &I2S_InitStructure);
- I2S_FullDuplexConfig(I2S2ext, &I2S_InitStructure);
- I2S_Cmd(SPI2, DISABLE);
-
- I2S_Cmd(I2S2ext, ENABLE);
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- for(i=0;i<200;i++)
- {
- while (SPI_I2S_GetFlagStatus(I2S2ext, SPI_FLAG_RXNE) == RESET);
- soundbuf1[i] = SPI_I2S_ReceiveData(I2S2ext);
- }
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多谢楼主。
我按您的方法试了,IS2发送好像正常,接收EXT_SD没有输出(输出全0,中断中看的),调试2天了。拜托您指导一下。
1. 我的硬件配置是用SPI2, PI0=WS; PI1=SCK, PI3=SD, PC2=EXT_SD; 软件配置和您的差不多,仅仅端口改了,SD与EXT_SD模式都为I2S_InitStructure.I2S_Mode = I2S_Mode_MasterTx;。
2. I2S_Cmd(SPI2, DISABLE)好像不能工作,必须I2S_Cmd(SPI2, ENABLE);I2S_Cmd(I2S2ext, ENABLE);都用I2S才能进TX中断
3. 另外发现PC2的EXT_SD AF功能居然在stm32f4xx_gpio.h没有定义,但是DATASHEET标明是AF6,我就用其试了,也试了AF5,接收EXT_SD输出任然全0。
数据是在中断中看的,如下,目的是将接收的数据发往发送,正常的话,应该可以在耳机中听到LINE IN的音乐。
temp=SPI_I2S_ReceiveData(I2S2ext);
SPI_I2S_SendData(SPI2, temp);
能否指点一下?多谢!
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