readme.txt

str710的AD转换C程序

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Example description
===================
 This example demonstrates how to use the ADC12 in single channel conversion mode
 and switch on a led connected to Port 0 according to the conversion result using the
 ADC12 interrupt service routine.
 Use the board varistor (mounted on the MB393B board) to modify the channel 0
 analog input value.When running the example, you can see just one of the four leds on the GPIO0 
 switched on according to the ADC conversion result. For example, the led3 is switched on if the 
 ADC conversion result is greater than 0x3C8 and less than 0x790.  

 This example demonstrates :

  - The conversion mode and the channel selection,
  - The prescaler configuration,
  - The use of the converter in single channel conversion mode,
  - ADC12 interrupt configuration,
  - ADC12 interrupt handling.

 This example is split into 4 parts:

1) Analog input configuration

   - Configure the used analog input (channel 0)to High impedance Analog input.

2) EIC configuration

   - ADC12 channel priority configuration,
   - Enable ADC12 channel interrupt,
   - Enable Interrupt.

3) Converter configuration

  - Initialize the converter,
  - Configure the prescaler register,
  - Configure the conversion mode,
  - Select the channel to be converted,
  - Enable interrupts,
  - Start the convertion.

4) Get the convertion result and switch on a led in the ADC12_IRQHandler in 71x_it.c

  - Read the conversion result,
  - Locate the conversion result 
  - switch on one led on GPIO0 according to the ADC conversion result.

Hardware implementation:
=======================
 This example works as standalone on the STR7-Eval board (mb393) and
 extra hardware implementation is not required to run the example.

Directory contents
==================
 scat.scf    Scatter file
 71x_conf.h  Library Configuration file
 71x_it.c    Interrupt handlers
 main.c      Main program

How to use it
=============
 In order to make the program work, you must do the following:

  - Ensure that RAM is mapped at address 0x0000 using the board H/W boot pins,
  - Compile and run it.


(C) COPYRIGHT 2003 STMicroelectronics