gsm_irq.c

分频计时4.615ms产生中断信息用于GSM中的信息验证

#include <stdio.h>

main()
{
	printf("------------------Start-------------------\n " ) ;
	int buffer [511:0];
	int i;
	 //gptimer1
	*(volatile unsigned int *)(0x80000304) = 0x27;//40M分频最大值是3F,分频1M
	*(volatile unsigned int *)(0x80000314) = 0x1206;//1M分频为4.615ms（216.68Hz）
	*(volatile unsigned int *)(0x80000318) = 0xE;
	
      /*every 4.615ms gernate a irq and give the irq sign*/ 
	  
	while (1)
	 {      
		if (1) //判断起始位
		 {
			*(volatile unsigned int *)(0x80000318) = 0xF;//enable timer
			//remain for reading data
			 /*while (i<the length of data)
				{i = i + 1;
				//write data to buffer                       
				buffer[ i ] =  *(volatile unsigned int *)(0x80000000)
				 }
			*/
			if((*(volatile unsigned int *)(0x80000318)&0x10))//达到4.615ms产生中断标志
				{
					*(volatile unsigned int *)(0x80000318) = 0xE;/*shut down the timer
															read interrupt*/
					*(volatile unsigned int *)(0x80000318) = *(volatile unsigned int *)(0x80000318) & 0xEF;//clear interrupt
					printf("\n the data of buffer \n " ) ;
				}
			
	/*	printf("%x\t",(*(volatile unsigned int *)(0x80000300)));
		printf("%x\t",(*(volatile unsigned int *)(0x80000304)));
		printf("%x\t",(*(volatile unsigned int *)(0x80000308)));
		printf("%x\t",(*(volatile unsigned int *)(0x80000310)));
		printf("%x\t",(*(volatile unsigned int *)(0x80000314)));
		printf("%x\t",(*(volatile unsigned int *)(0x80000318)));
		printf("%x\t",(*(volatile unsigned int *)(0x80000320)));
		printf("%x\t",(*(volatile unsigned int *)(0x80000324)));
		printf("%x\t",(*(volatile unsigned int *)(0x80000328)));
		printf("\n" ) ;
	*/
		}        
	}
}