MMA7660方向定位算法.doc

 File:        MMA7660_Orientation.c

  Description:    Orientation Detection Algorithm

 Ver 1.0.0 Released Jun.2009

C O N F I D E N T I A L                                                  

This code is released under the Non-Disclosure Agreement (NDA) between   
customer and Freescale, and is allowed to use in Freescale's products    
only                                                                     

THIS  CODE IS ONLY INTENDED AS AN EXAMPLE FOR DEMONSTRATING THE FREESCALE
MICROCONTROLLERS.  IT  HAS ONLY BEEN GIVEN A MINIMUM LEVEL OF TEST. IT IS
PROVIDED  'AS  SEEN'  WITH  NO  GUARANTEES  AND  NO  PROMISE  OF SUPPORT.

Freescale  is  not  obligated  to  provide  any  support, upgrades or new
releases  of  the Software. Freescale may make changes to the Software at
any time, without any obligation to notify or provide updated versions of
the  Software  to you. Freescale expressly disclaims any warranty for the
Software.  The  Software is provided as is, without warranty of any kind,
either  express  or  implied,  including, without limitation, the implied
warranties  of  merchantability,  fitness  for  a  particular purpose, or
non-infringement.  You  assume  the entire risk arising out of the use or
performance of the Software, or any systems you design using the software
(if  any).  Nothing  may  be construed as a warranty or representation by
Freescale  that  the  Software  or  any derivative work developed with or
incorporating  the  Software  will  be  free  from  infringement  of  the
intellectual property rights of third parties. In no event will Freescale
be  liable,  whether in contract, tort, or otherwise, for any incidental,
special,  indirect, consequential or punitive damages, including, but not
limited  to,  damages  for  any loss of use, loss of time, inconvenience,
commercial loss, or lost profits, savings, or revenues to the full extent
such  may be disclaimed by law. The Software is not fault tolerant and is
not  designed,  manufactured  or  intended by Freescale for incorporation
into  products intended for use or resale in on-line control equipment in
hazardous, dangerous to life or potentially life-threatening environments
requiring  fail-safe  performance,  such  as  in the operation of nuclear
facilities,  aircraft  navigation  or  communication systems, air traffic
control,  direct  life  support machines or weapons systems, in which the
failure  of  products  could  lead  directly to death, personal injury or
severe  physical  or  environmental  damage  (High  Risk Activities). You
specifically  represent and warrant that you will not use the Software or
any  derivative  work of the Software for High Risk Activities.          
Freescale  and the Freescale logos are registered trademarks of Freescale
Semiconductor Inc.                                                       
/

#include "MMA7660_Orientation.h"
extern VUINT8 MMA7660_SPCNT_Value;
extern VUINT8 MMA7660_INTSU_Value;
extern VUINT8 MMA7660_MODE_Value;
extern VUINT8 MMA7660_SR_Value;
extern VUINT8 MMA7660_PDET_Value;
extern VUINT8 MMA7660_PD_Value;
extern VINT8 Xnew8, Ynew8, Znew8;
extern VUINT8 MMA7660_InterruptFlag;
VUINT8 MMA7660_OrientationStatus;
ORIENTATION MMA7660_Orientation;

void MMA7660_Orientation_InterruptService(void){
  VUINT8 temp8u;
  if(!MMA7660_InterruptFlag) return;

  MMA7660_InterruptFlag = 0;

  MMA7660_OrientationStatus = mma7660_IICRead_Alert(MMA7660_TILT)&0x1F;
  IIC_Read_MMA7660_XYZ6(&Xnew8, Ynew8, &Znew8);

  if(Znew8>=MMA7660_Sin30pos) MMA7660_Orientation = FLAT;
  else if(Znew8<=MMA7660_Sin30neg) MMA7660_Orientation = FLAT_DOWN;
  else
  {
    temp8u = MMA7660_OrientationStatus&0x1C;
    if(temp8u==0)
    {
      if((MMA7660_OrientationStatus&0x03)==0x02) MMA7660_Orientation = FLAT_DOWN;
      else MMA7660_Orientation = FLAT;
    }
    else
    {
      if(temp8u==0x04) MMA7660_Orientation = YDOWN;
      else if(temp8u==0x08) MMA7660_Orientation = YUP;
      else if(temp8u==0x14) MMA7660_Orientation = XDOWN;
      else if(temp8u==0x18) MMA7660_Orientation = XUP;
    }
  }
}

void MMA7660_Orientation_Startup(void){
  MMA7660_SPCNT_Value = 60;     //Sleep delay = 60/1616 = 60s
  MMA7660_INTSU_Value = 0x03;   //Only Front/Back position change and Up/Down/Right/Left Position change cause interrupts
  MMA7660_SR_Value = 0xFC;      //FILT[2:0] = 111 - 8 samples per filter
                                //AWSR[1:0] = 11  - 1 samples/second on auto-wake mode
                                //AMSR[2:0] = 100 - 8 samples/second on active mode
  MMA7660_MODE_Value = 0x39;    //Interrupt output high active
                                //Interrupt output open drain
                                //Sleep counter clock divided by 16
                                //Auto-Sleep enabled
                                //Auto-Wake enabled
                                //Test Mode off
                                //Active Mode
  MMA7660_Init();
我们是深圳本土最受客户青睐、成长最快、最关注增值服务的MID电子元件提供商之一。我们深圳的长期大量现货型号有：MMA7660, MMA7455, MMA8452QR1, MXC6225XU, MMC3140MS, TS1003,MPU-3050, ALC5621, ALC5625, WM8988, ES8388，联系热线：13714686590，杨先生