linkboot_tx.c

高端dsp:tigersharc ts101的boot代码,c语言

//*********************************************************
//
//  linkboot_tx.c : Link port boot code
//
//  PROVIDED BY:
//  ------------
//  BittWare Research Systems, Inc.
//  33 North Main Street
//  Concord, NH  03301
//  Ph: 603-226-0404
//  Fax: [phone]
//  WWW: www.bittware.com
//  E-mail: [e-mail]
//
//  Copyright 2001, BittWare, Inc.
//
//  The user is hereby granted a non-exclusive license to use and or 
//  modify this software provided that it runs on BittWare hardware.  
//  Usage of this software on non-BittWare hardware without the express 
//  written permission of BittWare is strictly prohibited.
//
//
//    Ver.  Dates     Author  Changes                                
//    ----  --------  ------  -----------------------------
//    1.0   04/11/02   rpc     Create
//
//*********************************************************

#include "sysreg.h"
#include "signal.h"
#include "stdio.h"

#define N 256 			    // Number of words to transfer

void isr_DMA7(int);			// Proto for isr

int dm source[N];			// Source buffer
volatile int tx_intr = 0;

typedef struct  
{
	int *DI;				// index
	int DX;					// count and stride in x direction
	int DY;					// count and stride in y direction
	int DP;					// DMA control word
}TCB;

TCB TCB_temp;		        // Temp structure for programming TCBs

__builtin_quad q;			// Temp quad for programming TCBs

// ISR for DMAC7 (link 3 tx)
void isr_DMA7(int sig)
{		
    tx_intr++;
}


void main(void)
{
	int i;					// loop var
	
	__builtin_sysreg_write(__SYSCON, 0x003a5000);   // 64-bit external bus for memory (MBUB)
	
	TCB_temp.DI = source;							// index points to source buffer
	TCB_temp.DX = 4 | (N << 16);					// modify is 4 for quad-word transfers, count is N and must be shifted to upper half 
	TCB_temp.DY = 0;								// only a 1 dimension DMA
	TCB_temp.DP = 0x47000000;						// control word set for quad-word transfers to internal memory with interrupt enabled

    // setup LP3 to TX at CCLK/8
    __builtin_sysreg_write(__LCTL3, 0x040);

	q = __builtin_compose_128((long long) TCB_temp.DI | (long long)TCB_temp.DX << 32, 
							  (long long)(TCB_temp.DY | (long long)TCB_temp.DP << 32));

	__builtin_sysreg_write4(__DC7, q);				// program the TCBs

	while(tx_intr == 0)									// Endless loop
	{
		i=i-i;
	}
}

//
// End of file: linkboot_tx.c
//