init.c

TVP5150 视频解码芯片驱动包含I2C模拟 VDSP环境

#include "init.h"

void Init_PLL(void)
{
	volatile int test=0;

	sysreg_write(reg_SYSCFG, 0x32);		//Initialize System Configuration Register

	*pSIC_IWR = 0x1;
	*pPLL_CTL = 0x2C00;
	ssync();
	idle();


}//end Init_PLL

//Setup of the async interface
void Init_EBIU(void)
{
	
	*pEBIU_AMBCTL0	= 0x7bb07bb0;	// <--|Write access time = 7 cycles, read access time = 11 cycles, no ARDY
	*pEBIU_AMBCTL1	= 0x7bb07bb0;	//    |Hold time = 2 cycles, setup time = 3 cycles, transition time = 4 cycles
	*pEBIU_AMGCTL	= 0x000F;		//	  |Enable all memory banks

}//end Init_EBIU

EX_INTERRUPT_HANDLER(DMA0_PPI_ISR)	// <--|declaration in  exception.h -->
{									//    |declaration with _pragma(interrupt) the ISR Startaddress 


	//disable the interrupt request
	*pDMA0_IRQ_STATUS = 0x1;	
	
	printf( "\nThe DMA0 PPI Interrupt has been entered!\n" );

}//end DMA0_PPI_ISR

void Init_Interrupts(void)
{

	// configure interrupt
	*pSIC_IAR0 = *pSIC_IAR0 & 0xffffffff | 0x00000000;	
	*pSIC_IAR1 = *pSIC_IAR1 & 0xffffffff | 0x00000001;	// map DMA0 PPI Interrupt -> IVG8
	*pSIC_IAR2 = *pSIC_IAR2 & 0xffffffff | 0x00000000;	
														
	
	register_handler(ik_ivg8, DMA0_PPI_ISR);			// assign DMA0 PPI ISR to interrupt vector 8

	
	*pSIC_IMASK=0x00000100; // all interrupts 0=disabled but DMA0 PPI interrupt enabled	
		

}//end Init_Interrupts


//SDRAM Setup
void Init_SDRAM(void)
{
	if (*pEBIU_SDSTAT & SDRS) {
		//SDRAM Refresh Rate Control Register
		*pEBIU_SDRRC = 0x00000817;	

		//SDRAM Memory Bank Control Register
		*pEBIU_SDBCTL = 0x00000013;

		//SDRAM Memory Global Control Register	
		*pEBIU_SDGCTL = 0x0091998d;	

		ssync();
	}
														
		

}//end Init_SDRAM

void Init_DMA(void)
{

	//Target address of the DMA
	*pDMA0_START_ADDR = 0x0;	

	//Line_Length 16bit transfers will be executed
	*pDMA0_X_COUNT = Line_Length;

	//The modifier is set to 2 because of the 16bit transfers
	*pDMA0_X_MODIFY = 0x1;	
														
	//Frame_Length 16bit transfers will be executed
	*pDMA0_Y_COUNT = Frame_Length;

	//The modifier is set to 2 because of the 16bit transfers
	*pDMA0_Y_MODIFY = 0x1;	

	//PPI Peripheral is used
	*pDMA0_PERIPHERAL_MAP = 0x0;	
	
	//DMA Config: Enable DMA | Memory write DMA | 2-D DMA | Discard DMA FIFO before start | enable assertation of interrupt | NDSIZE for stop mode | Enable STOP DMA
	//*pDMA0_CONFIG = DMAEN | DI_EN | WNR | WDSIZE_16| DMA2D | RESTART | DI_EN;	
	*pDMA0_CONFIG = DMAEN | DI_EN | WNR | DMA2D | RESTART | DI_EN;

}//end Init_DMA

void Init_PPI(void)
{

	//The PPI is set to receive 525 lines for each frame
	*pPPI_FRAME = 525;	

	//PPI enabled, input mode, active video only, receive field 1&2, 
	//packing enabled, skipping disabled, 8bit data bus, nothing inverted
	*pPPI_CONTROL = PORT_EN | FLD_SEL | PACK_EN | DLEN_8 ;


}//end Init_PPI