dsp28_sysctrl.c

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//---------------------------------------------------------------------------
// This function initializes the System Control registers to a known state.
//
#include "DSP28_Device.h"

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;        //系统输入时钟为30M，系统时钟为30Mx10/2=150M
// Wait for PLL to lock
   for(i= 0; i< 1000; i++){}
       
// HISPCP/LOSPCP prescale register settings, normally it will be set to default values
   SysCtrlRegs.HISPCP.all = 0x0001; //高速外围时钟为CLKOUT/2
   SysCtrlRegs.LOSPCP.all = 0x0002; //低速外围时钟为CLKOUT/4	

// Peripheral clock enables set for the selected peripherals.   
   SysCtrlRegs.PCLKCR.bit.EVAENCLK=0;
   SysCtrlRegs.PCLKCR.bit.EVBENCLK=0;
   SysCtrlRegs.PCLKCR.bit.SCIENCLKA=0;
   SysCtrlRegs.PCLKCR.bit.SCIENCLKB=0;
   SysCtrlRegs.PCLKCR.bit.MCBSPENCLK=0;
   SysCtrlRegs.PCLKCR.bit.SPIENCLK=1;
   SysCtrlRegs.PCLKCR.bit.ECANENCLK=0;
   SysCtrlRegs.PCLKCR.bit.ADCENCLK=0;
   EDIS;
	
}
	
//===========================================================================
// No more.
//===========================================================================