文件列表:

CE115_DMA_trap (0, 2007-09-12)
CE115_DMA_trap\DMA_trap.mcp (1063, 2007-09-12)
CE115_DMA_trap\DMA_trap.mcw (40960, 2007-07-23)
CE115_DMA_trap\h (0, 2007-09-12)
CE115_DMA_trap\h\tglPin.h (2676, 2007-09-11)
CE115_DMA_trap\h\uart1Drv.h (2869, 2007-09-11)
CE115_DMA_trap\src (0, 2007-09-12)
CE115_DMA_trap\src\createDmatrap.s (3573, 2007-09-11)
CE115_DMA_trap\src\getErrLoc.s (3363, 2007-09-11)
CE115_DMA_trap\src\main.c (4939, 2007-09-12)
CE115_DMA_trap\src\traps.c (6176, 2007-09-11)
CE115_DMA_trap\src\uart1Drv.c (6415, 2007-09-11)

Readme File for Code Example: CE115 - DMA Trap --------------------------------------------------- This file contains the following sections: 1. Code Example Description 2. Folder Contents 3. Suggested Development Resources 4. Reconfiguring the project for a different dsPIC33F device 5. Revision History 1. Code Example Description: ---------------------------- DMA generates trap error in the following conditions. DMA Write collision: DMA write collision occurs when both DMA module and CPU tries to write to the same DMA RAM memory location. Peripheral Write Collision: Peripheral write collision occurs when both DMA module and CPU tries to write to the same peripheral SFR. In this code example, UART is configured to contineously transmit/receive data in loop-back mode. In the back-ground loop, CPU tries to write to DMA RAM or peripheral SFR to create DMA trap condition. Select the required condition using the following macro in main.c function to generate DMA trap. // Source Selection for Trap Creation #define PER_WRITE_COL 1 #define DMA_WRITE_COL 0 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 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 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 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. 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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