readme.txt

stm32 cortexm－3 adc实例程序

/******************** (C) COPYRIGHT 2007 STMicroelectronics ********************
* File Name          : readme.txt
* Author             : MCD Application Team
* Version            : V1.0
* Date               : 10/08/2007
* Description        : Description of the ADC Example5.
********************************************************************************
* THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
* CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/
本例展示了如何使用双ADC对多路通道进行同时转化。

使用ADC1对通道14和通道17进行转化。使用ADC2对通道10和通道11进行转化。通道17与内部参考电压Vref相连。

一旦转换开始，ADC1和ADC2对对通道14和10的转换将同时开始，结果存于ADC1的32-bit DR寄存器内，其中高16bit为ADC2对通道10的转换结果，低16bit为ADC1对通道14的转换结果。之后由DMA把DR寄存器内的数据传送到内存中的ADC_DualConvertedValueTab表格。随后，ADC1和ADC2以及DMA会对通道17和通道11进行同样流程的转换和数据传送。

这样的转换-传送将会持续进行直到传送的数据数目达到DMA预设的上限。

对于STM3210B-LK1板，可以利用LCD把通道17上Vref的值，和通道10上分压器VR1上的电压值交替显示在屏幕上作为验证。

Example description
===================
This example describes how to use ADC1 and ADC2 in regular simultaneous dual mode.
ADC1 is configured to convert channel14 and channel17 regular channel continuously.
ADC2 is configured to convert channel10 and channel11 regular channel continuously.
The connection between internal Vref and channel17 is enabled.
Once the regular channels conversion is started by software, channel14 is converted
on ADC1 and channel10 is converted on ADC2 on the same time. The 32bits conversion 
result is then stored on ADC1 DR register. The DMA will transfer this data which will
be stored ADC_DualConvertedValueTab table. Consecutively to those conversion, channel17
is converted on ADC1 and channel11 on ADC2. The combined conversion result is also 
transfered by DMA to the same destination buffer. The same procedure is repeated until
the specified number of data to be transfered by DMA is reached.
The ADC1 clock is set to 14 MHz.


Directory contents
==================
stm32f10x_conf.h  Library Configuration file
stm32f10x_it.c    Interrupt handlers
stm32f10x_it.h    Interrupt handlers header file
main.c            Main program


Hardware environment
====================
 - Connect a known voltage, between 0-3.3V, to ADC Channel14 mapped on pin PC.04
   (potentiometer RV1 on STM3210B-EVAL board),ADC Channel10 mapped on pin PC.00 
   and ADC Channel11 mapped on pin PC.01.
   
      
How to use it
=============
In order to make the program work, you must do the following :
- Create a project and setup all your toolchain's start-up files
- Compile the directory content files and required Library files :
  + stm32f10x_lib.c
  + stm32f10x_adc.c
  + stm32f10x_dma.c
  + stm32f10x_gpio.c
  + stm32f10x_rcc.c
  + stm32f10x_nvic.c
  + stm32f10x_flash.c
    
- Link all compiled files and load your image into either RAM or FLASH
- Run the example


******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE******