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First version under SVN is V4.0.1

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Richard Barry 2006-05-02 09:39:15 +00:00
parent 243393860c
commit b6df57c7e3
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Demo/ARM7_STR71x_IAR/Library/wdg.c Normal file
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/******************** (C) COPYRIGHT 2003 STMicroelectronics ********************
* File Name : WDG.c
* Author : MCD Application Team
* Date First Issued : 10/24/2003
* Description : This file provides all the WDG software functions
********************************************************************************
* History:
* 30/11/2004 : V2.0
* 14/07/2004 : V1.3
* 01/01/2004 : V1.2
*******************************************************************************
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.
*******************************************************************************/
#include "wdg.h"
#ifndef abs
#define abs(x) ((x)>0 ? (x) : -(x))
#endif
/*******************************************************************************
* Function Name : FindFactors
* Description : Search for the best (a,b) values that fit n = a*b
* with the following constraints: 1<=a<=256, 1<=b<=65536
* Input 1 : n: the number to decompose
* Input/Output 2 : a: a pointer to the first factor
* Input/Output 3 : b: a pointer to the second factor
* Return : None
*******************************************************************************/
static void FindFactors(unsigned long n, unsigned int *a, unsigned long *b)
{
unsigned long b0;
unsigned int a0;
long err, err_min=n;
*a = a0 = ((n-1)/65536ul) + 1;
*b = b0 = n / *a;
for (; *a <= 256; (*a)++)
{
*b = n / *a;
err = (long)*a * (long)*b - (long)n;
if (abs(err) > (*a / 2))
{
(*b)++;
err = (long)*a * (long)*b - (long)n;
}
if (abs(err) < abs(err_min))
{
err_min = err;
a0 = *a;
b0 = *b;
if (err == 0) break;
}
}
*a = a0;
*b = b0;
}
/*******************************************************************************
* Function Name : WDG_PeriodValueConfig
* Description : Set the prescaler and counter reload value
* Input : Amount of time (us) needed
* Return : None
*******************************************************************************/
void WDG_PeriodValueConfig ( u32 Time )
{
unsigned int a;
unsigned long n, b;
n = Time * (RCCU_FrequencyValue(RCCU_PCLK) / 1000000);
FindFactors(n, &a, &b);
WDG->PR = a - 1;
WDG->VR = b - 1;
}
/******************* (C) COPYRIGHT 2003 STMicroelectronics *****END OF FILE****/