www.pudn.com > ads8364.rar > DSP28_SysCtrl.c

// 
//      TMDX ALPHA RELEASE 
//      Intended for product evaluation purposes 
// 
//########################################################################### 
// 
// FILE:	DSP28_SysCtrl.c 
// 
// TITLE:	DSP28 Device System Control Initialization & Support Functions. 
// 
//########################################################################### 
// 
//  Ver | dd mmm yyyy | Who  | Description of changes 
// =====|=============|======|=============================================== 
//  0.55| 06 May 2002 | L.H. | EzDSP Alpha Release 
//  0.56| 20 May 2002 | L.H. | No change 
//  0.57| 24 May 2002 | L.H. | Added initialization of RAM control registers 
//      |             |      | for TMX samples. 
//  0.58| 29 Jun 2002 | L.H. | Added InitFlash function.  Must be run from RAM 
//########################################################################### 
 
 
#include "DSP28_Device.h" 
 
// Functions that will be run from RAM need to be assigned to  
// a different section.  This section will then be mapped using 
// the linker cmd file. 
#pragma CODE_SECTION(InitFlash, "ramfuncs"); 
 
//--------------------------------------------------------------------------- 
// InitSysCtrl:  
//--------------------------------------------------------------------------- 
// This function initializes the System Control registers to a known state. 
// 
void InitSysCtrl(void) 
{ 
   Uint16 i; 
   EALLOW; 
    
// On TMX samples, to get the best performance of on chip RAM blocks M0/M1/L0/L1/H0 internal 
// control registers bit have to be enabled. The bits are in Device emulation registers. 
   DevEmuRegs.M0RAMDFT = 0x0300; 
   DevEmuRegs.M1RAMDFT = 0x0300; 
   DevEmuRegs.L0RAMDFT = 0x0300; 
   DevEmuRegs.L1RAMDFT = 0x0300; 
   DevEmuRegs.H0RAMDFT = 0x0300; 
    
            
// Disable watchdog module 
   SysCtrlRegs.WDCR= 0x0068; 
 
// Initalize PLL 
   SysCtrlRegs.PLLCR = 0xA; 
   // Wait for PLL to lock 
   for(i= 0; i< 5000; i++){} 
        
// HISPCP/LOSPCP prescale register settings, normally it will be set to default values 
   SysCtrlRegs.HISPCP.all = 0x0001; 
   SysCtrlRegs.LOSPCP.all = 0x0002;	 
// Peripheral clock enables set for the selected peripherals.    
   SysCtrlRegs.PCLKCR.bit.EVAENCLK=1; 
   SysCtrlRegs.PCLKCR.bit.EVBENCLK=1; 
   SysCtrlRegs.PCLKCR.bit.SCIENCLKA=1; 
   SysCtrlRegs.PCLKCR.bit.SCIENCLKB=1; 
   SysCtrlRegs.PCLKCR.bit.MCBSPENCLK=1; 
   SysCtrlRegs.PCLKCR.bit.SPIENCLK=1; 
   SysCtrlRegs.PCLKCR.bit.ECANENCLK=1; 
   SysCtrlRegs.PCLKCR.bit.ADCENCLK=1; 
   EDIS; 
	 
} 
 
// This function initializes the Flash Control registers 
 
//                   CAUTION  
// This function MUST be executed out of RAM. Executing it 
// out of OTP/Flash will yield unpredictable results 
 
void InitFlash(void) 
{ 
   EALLOW; 
   //Enable Flash Pipeline mode to improve performance 
   //of code executed from Flash. 
   FlashRegs.FOPT.bit.ENPIPE = 1; 
    
   //                CAUTION 
   //Minimum waitstates required for the flash operating 
   //at a given CPU rate must be characterized by TI.  
   //Refer to the datasheet for the latest information.   
 
   //Set the Random Waitstate for the Flash 
   FlashRegs.FBANKWAIT.bit.RANDWAIT = 5; 
    
   //Set the Paged Waitstate for the Flash 
   FlashRegs.FBANKWAIT.bit.PAGEWAIT = 5; 
    
   //                CAUTION 
   //Minimum cycles required to move between power states 
   //at a given CPU rate must be characterized by TI.  
   //Refer to the datasheet for the latest information. 
      
   //For now use the default count 
    
   //Set number of cycles to transition from sleep to standby 
   FlashRegs.FSTDBYWAIT.bit.STDBYWAIT = 0x01FF;        
    
   //Set number of cycles to transition from standby to active 
   FlashRegs.FACTIVEWAIT.bit.ACTIVEWAIT = 0x01FF;    
   EDIS; 
}	 
 
 
//--------------------------------------------------------------------------- 
// KickDog:  
//--------------------------------------------------------------------------- 
// This function resets the watchdog timer. 
// Enable this function for using KickDog in the application  
/* 
void KickDog(void) 
{ 
    EALLOW; 
    SysCtrlRegs.WDKEY = 0x0055; 
    SysCtrlRegs.WDKEY = 0x00AA; 
    EDIS; 
} 
*/ 
 
 
	 
//=========================================================================== 
// No more. 
//===========================================================================