readme.txt

PIC 单片机 SPI 例程 PIC 单片机 SPI 例程 PIC 单片机 SPI 例程

                     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