Readme File for Code Example: CE113 - Configuring the Data Converter Interface for I2S master mode operation to interface with 48KHz 24-bit Stereo Codecs ----------------------------------------------------------- This file contains the following sections: 1. Code Example Description 2. Folder Contents 3. Suggested Development Resources 4. configuring the project for a different dsPIC33F device 5. Revision History 1. Code Example Description: ---------------------------- The dsPIC Digital Signal Controllers feature a Data Converter Interface (DCI or Codec Interface) peripheral module on-chip. This module is useful to interface the dsPIC with high-resolution codecs, A/D and D/A converters that stream data into the dsPIC or out from the dsPIC device. The attached code example has file named i2SDrv.c. This file contains functions to intialize the DCI peripheral and DMA channels as well as Interrupt handlers for the Dma channels.DMACH0 is configured totransfer data from DMARAM address to to peripheral address.DMACH1 is configured to transfer data from peripheral address to DMARAM address in Continuous Ping-Pong modes.The DCI module is set up for Master mode of operation in which it provides the Frame Sync signal on the COFS pin,as well as the bit clock on the CSCK pin.The DCI module is initialized for interfaceing to a ****Fs I2S Codec.The frame sync signal has a frequency of 48KHz,while the bit clock has a frequency of ****48000=3MHz, as shown below: FIGURE 1 _______________________________ | | | COFS: | |_______________________________| _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ CSCK:_| |_| |_| |_| |_| |_| |_| |_| |_| |_| |_| |_| |_| |_| |_| |_| |_| |_| |<--------Left Channel Data---->|<----Right Channel Data------->| |<---------32 bits------------->|<---------32 bits------------->| |<---TXBUF0---->|<----TXBUF1--->|<---TXBUF2---->|<----TXBUF3--->| |<---RXBUF0---->|<----RXBUF1--->|<---RXBUF2---->|<----RXBUF3--->| |<--TimeSlot0-->|<--TimeSlot1-->|<--TimeSlot0-->|<--TimeSlot1-->| |<--------------------1/Fs = 20.8 microseconds----------------->| The code in the main function calls the initialization routine for the DCI and DMA module and then waits in a while(1) loop. From this point on the DCI interrupts transmit data out on the CSDO pin and read data in from the CSDI pin. 2. Folder Contents: ------------------- This folder contains the following sub-folders: a. C:\Program Files\Microchip\MPLAB C30\support\gld This folder will have the device GLD file, it is used for building the project. This file was provided with the MPLAB C30 v2.02 toolsuite. b. C:\Program Files\Microchip\MPLAB C30\support\h This folder contains C header files useful in building this project. Device register and bit definitions are provided in the *.h file that follows the device name. These files were provided with the MPLAB C30 v2.02 toolsuite. c. C:\Program Files\Microchip\MPLAB C30\lib This folder contains library archive files, which are a collection of precompiled object files. The file named "libpic30-coff.a" contains the C run-time start-up library. These file were provided with the MPLAB C30 v2.02 toolsuite. d. hex This folder contains three file types - coff, hex and map. These are files generated by the MPLAB C30 toolsuite on build operation performed within MPLAB IDE. The *.map file contains details on memory allocation for various variables, constants and dsPIC instructions specified in the source and library code. The *.hex file contains a binary file that may be programmed into the dsPIC device. The *.coff file contains a binary file that is used by MPLAB IDE for simulation. e. h This folder contains include files for the code example. f. src This folder contains all the C and Assembler source files (*.c, *.s) used in demonstrating the described example. This folder also contains a sub-folder named "obj" that stores compiled object files generated when the project is built. 3. Suggested Development Resources: ----------------------------------- a. MPLAB IDE v7.31.01 or later b. MPLAB C30 v2.02 or later c. MPLAB ICD 2 R23 or later e. Explorer 16 Demo board with dsPIC33FJ256GP710 controller 4. Reconfiguring the project for a different dsPIC33F device: ------------------------------------------------------------- The Project/Workspace can be easily reconfigured for any dsPIC33F device. Please use the following general guidelines: a. Change device selection within MPLAB IDE to a dsPIC33F device of your choice by using the following menu option: MPLAB IDE>>Configure>>Select Device b. Provide the correct device linker script and header file for your device. Device linker scripts and header files are available in your MPLAB C30 installation folder under: Device Linker Script- YourDrive:>Program Files\Microchip\MPLAB C30\support\gld Device C Header file- YourDrive:>Program Files\Microchip\MPLAB C30\support\h Device ASM Include file- YourDrive:>Program Files\Microchip\MPLAB C30\support\inc c. Provide the appropriate path to your MPLAB C30 support file locations using the menu option: MPLAB IDE>>Project>>Build Options>>Project d. Chose the development board applicable to your device. Some options are provided below: e. Re-build the MPLAB project using the menu option: MPLAB IDE>>Project>>Build All f. Download the hex file into the device and run. 5. Revision History : --------------------- 04/01/2006 - Initial Release of the Code Example

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