init interrupts.c

来自「基于visual dsp++开发环境」· C语言 代码 · 共 31 行

#include "system.h"


/********************************************************************************/
/***** InitInterrupts()														*****/
/***** This function configures PPI DMA interrupt in IVT 8   .				*****/
/********************************************************************************/
void InitInterrupts(void)
{
	// configure interrupts
	register_handler(ik_ivg8, PPI_TX_Isr);		// assign ISR to interrupt vector
	
	*pSIC_IAR1 =  0x00000001;
	*pSIC_IMASK = 0x00000100;					// enable PPI (DMA0) interrupt

}

/********************************************************************************/
/***** PPI DMA Interrupt Service Routine									*****/
/********************************************************************************/
EX_INTERRUPT_HANDLER(PPI_TX_Isr)
{	
	Ping_Pong = (Ping_Pong + 1)%2;		// Toggle Flag
	DMA_completed_Transmission = 1;		// Set Semaphore for main routine

	// confirm interrupt handling (NO Error Handling is implemented!)
	*pDMA0_IRQ_STATUS |= 0x0001;		// Write 1 to clear
	asm("ssync;");
}