eic.c

st arm7中的71x中部分功能源代码

/******************** (C) COPYRIGHT 2003 STMicroelectronics ********************
* File Name          : eic.c
* Author             : MCD Application Team
* Date First Issued  : 06/25/2003
* Description        : This file provides all the EIC software functions
********************************************************************************
* History:
*  13/01/2006 : V3.1
*  24/05/2005 : V3.0
*  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 "eic.h"

/*******************************************************************************
* Function Name  : EIC_Init
* Description    : Initialise the EIC using the load PC instruction
*                  (PC = PC +offset)
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void EIC_Init(void)
{
  extern u32 T0TIMI_Addr;
  u8 bCounter;
  u32 dOffset=((u32)&T0TIMI_Addr);

  /* Disable FIQ and IRQ interrupts */
  EIC->ICR = 0x00000000; 

  /* Disable all channels interrupts */
  EIC->IER = 0x00000000; 

  /* Clear all pending bits */
  EIC->IPR = 0xFFFFFFFF; 

  /* Disable all FIQ channels interrupts and clear FIQ */
  EIC->FIR = 0x0000000C; 

  /* channels pending bits */
  /* Ste the current priority level to zero */                         
  EIC->CIPR = 0x00000000; 

  /* IVR = high half of load PC instruction */
  EIC->IVR  = 0xE59F0000; 

  dOffset = (dOffset+0x00007E0)<<16;

  /* Initialize SIRn registers */
  for(bCounter=0; bCounter<32; bCounter++) 
  {
    EIC->SIR[bCounter] = dOffset|0xF0000000;
    dOffset += 0x00000004 << 16;
  }
}

/*******************************************************************************
* Function Name  : EIC_CurrentPriorityLevelConfig
* Description    : Change the current priority level of the srved IRQ routine
* Input 1        : New priority
* Output         : None
* Return         : None
*******************************************************************************/
void EIC_CurrentPriorityLevelConfig(u8 NewPriorityLevel)
{
  u32 dVal;

  /* Save ICR content */
  dVal = EIC->ICR;              

  /* Disable IRQ interrupts. */
  EIC->ICR &= ~0x0001;          

  /* Change the current priority */
  EIC->CIPR = NewPriorityLevel; 

  /* Restore ICR content */
  EIC->ICR = dVal;              
}

/******************* (C) COPYRIGHT 2003 STMicroelectronics *****END OF FILE****/