4 Replies Latest reply on Aug 22, 2014 2:04 PM by userc_7973

    question for IIS interface.



      I hope to get a sample source code for IIS interface working on WICED 2.4.1.

      I want to test for audio.

      If you have it tested, please let me get it.


      Thank you all.


        • 1. Re: question for IIS interface.

          Now, IIS interface works with below in WCD4 using WICED 2.4.1


          But, when I enable Interrupt for I2S after DMA Init, it stops when the boards boot up.

          Is there any way to register interrupt handler?


          1. DMA Init

          #define Audio_DMA_I2S2_Stream DMA1_Stream3
          #define Audio_DMA_I2S2_Channel  DMA_Channel_0
          #define Audio_DMA_I2S2_IRQ      DMA1_Stream3_IRQn


              DMA_InitTypeDef DMA_InitStructure;

          RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);


              // Common initialization
          DMA_InitStructure.DMA_BufferSize = AUDIO_BUFFER_SIZE;
          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_Circular;
          DMA_InitStructure.DMA_Priority = DMA_Priority_High;
          DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
          DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
          DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
          DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;

              // DMA configuration for input & output if I2S data.

              // Configure each DMA channel to use double-buffered mode
          // in circular mode.

              // This allows the software codec read/write operation form the one memory while the DMA
          // is reading/writing to the other memory.

              // I2S2 - DMA configuration for sending data to the codec/speaker
          DMA_Cmd(Audio_DMA_I2S2_Stream, DISABLE);
          DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
          DMA_InitStructure.DMA_Channel = Audio_DMA_I2S2_Channel;
          DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) &SPI2->DR;
          DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t) &audio_rx_buffer[AUDIO_BUFFER_0][0];


          //DMA_DoubleBufferModeConfig(Audio_DMA_I2S2_Stream, (uint32_t) &audio_rx_buffer[AUDIO_BUFFER_1][0], DMA_Memory_0);
          //DMA_DoubleBufferModeCmd(Audio_DMA_I2S2_Stream, ENABLE);

          DMA_Init(Audio_DMA_I2S2_Stream, &DMA_InitStructure);


              // Enable DMA SPI RX Stream
          DMA_Cmd(Audio_DMA_I2S2_Stream, ENABLE);


              // trigger interrupt when transfer half complete/complete
          DMA_ITConfig(Audio_DMA_I2S2_Stream, DMA_IT_TC, ENABLE);


              // Enable SPI3 Rx buffer empty interrupt
          SPI_I2S_ITConfig(SPI2, SPI_I2S_IT_RXNE, ENABLE);


              // Enable SPI interrupts to DMA
          SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Rx, ENABLE);



          2. I2S interrupt enable

              // NVIC: Configure the DMA interrupt priority
          NVIC_InitTypeDef NVIC_InitStructure;
          NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

          NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
          NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
          NVIC_InitStructure.NVIC_IRQChannel = Audio_DMA_I2S2_IRQ;


          void DMA1_Stream3_IRQHandler()

              if (DMA_GetITStatus(DMA1_Stream3, DMA_IT_TCIF3) == SET)
          DMA_ClearITPendingBit(DMA1_Stream3, DMA_IT_TCIF3);



          Thank you.

          • 2. Re: question for IIS interface.



            Register your specific interrupts for the application. Interrupts are shared with bootload and application. You can build the bootloader without your interrupts and application with your interrupts. Please checkout  Re: Custom interrupts.


            Hope it helps,


            1 of 1 people found this helpful
            • 3. Re: question for IIS interface.

              Hi Seyhan,


              I cannot find interrupts shared in bootloader.

              Could you let me know where can I find it?


              Thank you for your help.

              • 4. Re: question for IIS interface.

                Hi Seyhan,


                Do you know how to register the custum interrupt handler like void DMA1_Stream3_IRQHandler() above?