main.c

基于visual dsp++开发环境

#include "main.h"

// set up DMA descriptors (one for each frame, then repeat)
// small descriptor model, only start address needs to be fetched

tDMA_descriptor DMA_PPI1_first = 	{&DMA_PPI1_second, sFrame0};
tDMA_descriptor DMA_PPI1_second = 	{&DMA_PPI1_third , sFrame1};
tDMA_descriptor DMA_PPI1_third = 	{&DMA_PPI1_fourth, sFrame2};
tDMA_descriptor DMA_PPI1_fourth = 	{&DMA_PPI1_first , sFrame3};


volatile int current_out_Frame = -1;		// 0, 1, 2 or 3  ... indicates the last frame that is output COMPLETELY

bool Set_DMA32 = false;



// User program
void main() {

	// set Clocks
	Set_PLL( (short)(CORECLK/CLKIN), (short)(CORECLK/SYSCLK));			// sets Core and System Clocks to the values defined in system.h 

	// initialise PPI1 and associated DMA channel for DAC OUTPUT
	
	current_out_Frame  = -1;				// no frames transmitted yet

	Set_DMA32 = false;
#ifdef DMA_32
	Set_DMA32 = true;
#endif

	InitPPI1(Set_DMA32, &DMA_PPI1_first, Lower_Blocksize, Upper_Blocksize);
	
	// initialise Interrupts
	InitInterrupts_coreB();
	

	// now ready to kick off PPI output stream. 
	// Just wait for core A to indicate that a valid frame has been received
	while (!semaphore_frames_received);				// loop until core A sets the semaphore
	
	semaphore_frames_received = false;
	
	// start transfers
	*pDMA1_1_CONFIG |= DMAEN;
	ssync();
	*pPPI1_CONTROL |= PORT_EN;
	ssync();
	if ( (*pDSPID & 0x000FFFF ) < 0x0002) 
		*pTIMER10_CONFIG = *pTIMER10_CONFIG;		// need to write again after enabling PPI1 for Rev <=0.1
	ssync();
	*pTMRS4_ENABLE |= TIMEN10;						//enable Timer and kick off PPI1
	ssync();

//	printf("Core #%d Started output stream!\n", &_CORE);


	
	
	// main loop, just wait for interrupts
	while(1) {
		idle();				//   do nothing
	}	// while(1)
		
	
}		// main