cn529917
所属分类:单片机开发
开发工具:C/C++
文件大小:31KB
下载次数:56
上传日期:2009-05-23 11:20:58
上 传 者:
redmajor2005
说明: PIC 单片机 SPI 例程
PIC 单片机 SPI 例程
PIC 单片机 SPI 例程
(PIC single-chip SPI routines)
文件列表:
CE138_SPI_2Slaves\CodeExample.mcp (986, 2007-09-12)
CE138_SPI_2Slaves\CodeExample.mcw (2986496, 2007-07-23)
CE138_SPI_2Slaves\h (0, 2007-09-12)
CE138_SPI_2Slaves\h\common.h (2495, 2007-09-11)
CE138_SPI_2Slaves\src (0, 2007-09-12)
CE138_SPI_2Slaves\src\main.c (6003, 2007-09-12)
CE138_SPI_2Slaves (0, 2007-09-12)
Readme File for Code Example:
CExxx - Using 2 SPI Slave Peripherals with one SPI module
---------------------------------------------------
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:
----------------------------
This code example shows using the SPI module in conjunction with 2 GPIO pins to communicate with 2 different slave
devices. The concept is that the GPIO are the slave selects for the individual devices, but the SCL, SDI and SDO are shared between the two processors. This is also scalable up to n devices, where your only limitation is the bus bandwidth on the SPI bus and the number of GPIO lines at your disposal.
Slave Select1 ---| |---------------------------------------------------------
|________________________________|
Slave Select2 ---------------------------------------------| |-----------------
|_______________________________|
SCLK xxxxxxxxxx |-| |-| |-| |-| |-| |-| |-| |-| xxxxxxxxxx |-| |-| |-| |-| |-| |-| |-| |-| xxxxxxxxxx
xxxxxxxxxx_| |_| |_| |_| |_| |_| |_| |_| |_xxxxxxxxxx_| |_| |_| |_| |_| |_| |_| |_| |_xxxxxxxxxx
SDO xxxxxxxxxx d7 d6 d5 d4 d3 d2 d1 d0 xxxxxxxxxx d7 d6 d5 d4 d3 d2 d1 d0 xxxxxxxxxx
The code alternates between sending data from one device to another and mixed.
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 :
---------------------
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