initialization.c

本人在DSP BF533上开发的控制GPS的程序

#include "system.h"
#include "ccblkfn.h"
#include "sysreg.h"

#include <sys\exception.h>
#include <cdefBF533.h>



void Init_PLL(void)
{
    int iIMASK_Value;
	sysreg_write(reg_SYSCFG, 0x32);		//Initialize System Configuration Register

	// set VCO/CCLK = 1, and VCO/SCLK = 5 (take effect immediately)
	*pPLL_DIV = 0x0005;

	// prepare PLL changes (set CLKIN/VCO = 22; takes effect after PLL programming sequence)
	*pPLL_LOCKCNT	= 0x0200;					// time for PLL to stabilize
	*pPLL_CTL		= 0x2c00;					// set VCO/CLKIN = 22

	// execute PLL programming sequence
	*pSIC_IWR		= 0x00000001;				// enable only PLL wakeup interrupt
	iIMASK_Value	= cli();					// disable interrupts
	idle();										// wait for PLL wakeup interrupt
	sti(iIMASK_Value);	
}//end Init_PLL 

void Init_UART(void)
{
	UART_GCTL1 myUART_GCTL1;
	UART_LCR1  myUART_LCR1;
	
	myUART_GCTL1.Value = 0x00;
	myUART_GCTL1.Bits.UCEN1 = 1;
	*pUART_GCTL = myUART_GCTL1.Value; //*pUART_GCTL = 0x0001;	
	
	myUART_LCR1.Value = 0x00;
	myUART_LCR1.Bits.WLS1 = 3;
	myUART_LCR1.Bits.DLAB1= 1;
	*pUART_LCR = myUART_LCR1.Value;  //	*pUART_LCR = 0x0083;
	
	asm("ssync;");
	
	*pUART_DLL = 0x0005;	//0x2c0 = 704,0x305	
	*pUART_DLH = 0x0003;	//UART Divisor Latch Registers
							//CLKIN = 24.576MHz,VCO = 22*24.576MHz = 540.672MHz
							//SCLK = 540.672/5 = 108.1344MHz
							//divisor = 108.1344MHz/(16*9600)=704=0x2c0
	asm("ssync;");
	
	myUART_LCR1.Bits.DLAB1 = 0;
	*pUART_LCR = myUART_LCR1.Value;  //	*pUART_LCR = 0x0003;
	asm("ssync;");

	*pUART_MCR = 0x0000;	//Modem Control Register
							//Loop=0(Loopback mode enable)
							//Forces TX to high and disconnects RX from RSR
	*pUART_IER = 0x0000;		//UART Interrupt Enable Register
							//ERBFI=1(Enable Receive Buffer Full Interrupt)
							//	0:No interrupt
							//	1:Generate RX interrupt if DR bit in UART_LSR is set
							//ETBEI=0(Enable Transmit Buffer Empty Interrupt)
							//	0:No interrrupt
							//	1:Generate TX interrupt if THRE bit in UART_LSR is set
							//ELSI=0(Enable RX Status Interrupt)
							//	0:No interrupt
							//	1:Generate line status interrupt if any of UART_LSR[4:1] is set
	asm("ssync;");
}

void Init_SDRAM(void)
{

	*pEBIU_SDRRC =  0x00000817;	//SDRAM Refresh Rate Control Register
	*pEBIU_SDBCTL = 0x00000001;	//SDRAM Memory Bank Control Register
	*pEBIU_SDGCTL = 0x0091998d;	//SDRAM Memory Global Control Register

	asm("ssync;");
}

void Init_EBIU(void)
{
	*pEBIU_AMBCTL0	= 0x7bb07bb0;
	*pEBIU_AMBCTL1	= 0x7bb07bb0;
	*pEBIU_AMGCTL	= 0x000f;

	*pLight = 0xFF; // All lights off
	*pLed = 0xFF;
}

void Init_Interrupts(void)
{
	// assign core IDs to interrupts
	*pSIC_IAR0 = 0xffffffff;
	*pSIC_IAR1 = 0xf4ffffff;					// UART -> ID4
	*pSIC_IAR2 = 0xffffffff;

	// assign ISRs to interrupt vectors
	register_handler(ik_ivg11, UART_ISR);		// UART ISR -> IVG 11

	// enable Timer0 and FlagA interrupt
	*pSIC_IMASK = 0x00004000;
}