/********************************************************************************/
/* 文件名:		5502_LED.c												   		*/												
/* 創建日期:	07/11/2004														*/
/* 功能描述: 	通過配置GPT和GPIO以及系統中斷來控制D5和D1兩個指示燈交替閃爍		*/
/*				從而達到驗證系統GPT,GPIO以及系統中斷的目的						*/													
/********************************************************************************/

#include <stdio.h>
#include <csl.h>
#include <csl_pll.h>
#include <csl_chip.h>
#include <csl_irq.h>
#include <csl_gpt.h>

/* Define and initialize the GPT module configuration structure  */
GPT_Config  MyGptConfig = {
0, 							//Emulation management register
0,		 					//GPIO interrupt control register
0,	 						//GPIO enable register
0,		 					//GPIO direction register
0,		 					//GPIO data register
0xB9EF, 					//Timer period register 1
0x05F5,	 					//Timer period register 2
0,							//Timer period register 3
0, 							//Timer period register 4
GPT_GPTCTL1_RMK(			//Timer control register 1
  GPT_GPTCTL1_TIEN_NOT_GATED,
  GPT_GPTCTL1_CLKSRC_VBUS,
  GPT_GPTCTL1_ENAMODE_CONTINUOUS,
  GPT_GPTCTL1_PWID_INACTIVE_1CYCLE,
  GPT_GPTCTL1_CP_CLOCK_MODE,
  GPT_GPTCTL1_INVIN_DONT_INVERT_OUTPUT,
  GPT_GPTCTL1_INVOUT_DONT_INVERT_OUTPUT
  ), 			
GPT_GPTCTL2_RMK(			//Timer control register 2
  GPT_GPTCTL2_TIEN_NOT_GATED,
  GPT_GPTCTL2_CLKSRC_VBUS,
  GPT_GPTCTL2_ENAMODE_CONTINUOUS,
  GPT_GPTCTL2_PWID_INACTIVE_1CYCLE,
  GPT_GPTCTL2_CP_CLOCK_MODE,
  GPT_GPTCTL2_INVIN_DONT_INVERT_OUTPUT,
  GPT_GPTCTL2_INVOUT_DONT_INVERT_OUTPUT
  ), 			
GPT_GPTGCTL1_RMK(			//Global timer control register
  GPT_GPTGCTL1_PSC34_DEFAULT,
  GPT_GPTGCTL1_TIMMODE_DEFAULT,
  GPT_GPTGCTL1_TIM34RS_NOT_IN_RESET,
  GPT_GPTGCTL1_TIM12RS_NOT_IN_RESET
  ) 	
};

/* Function/ISR prototypes */
interrupt void Timer0Isr(void);

/* Reference start of interrupt vector table   */
/* This symbol is defined in file, vectors.s55 */
extern void VECSTART(void);

/* Create a TIMER_Handle object for use with TIMER_open */
GPT_Handle 	 hGpt;

/* Define the power-off time length of LED */
#define TIMECONST 60000

Uint16 EventId0; 		// 定時器0所對應的事件ID號
Uint16 LEDMARK = 0;		// 設置指示燈的開關標志
Uint16 i = 0;
Uint16 j = 0;

/* 通過定義宏來控制兩個外圍存儲器映射的寄存器，從而實現對GPIO口的控制 */
#define  GPIODIR  	(*(volatile ioport Uint16*)(0x3400))
#define  GPIODATA 	(*(volatile ioport Uint16*)(0x3401))

void main(void)
{
	/* Initialize CSL library - This is REQUIRED !!! */
	CSL_init();

	/* PLL configuration structure used to set up PLL interface */
	// 主頻為300Mhz
    PLL_setFreq(1, 0xF, 0, 1, 3, 3, 0);
    
	/* Set IVPH/IVPD to start of interrupt vector table */
	IRQ_setVecs((Uint32)(&VECSTART));
	 
	/* Temporarily disable all maskable interrupts */
	IRQ_globalDisable();   
	
	/* Open Timer 0, set registers to power on defaults */
	/* And return handle of Timer 0 */
	hGpt = GPT_open(GPT_DEV0, GPT_OPEN_RESET);
	
	/* Get Event Id associated with Timer 0, for use with */
	/* CSL interrupt enable functions.                    */         
	EventId0 = GPT_getEventId(hGpt);
	
	/* Clear any pending Timer interrupts */
	IRQ_clear(EventId0);
	
	/* Place interrupt service routine address at */
	/* associated vector location */
	IRQ_plug(EventId0,&Timer0Isr);
	
	/* Write configuration structure values to Timer control regs */ 
	GPT_config(hGpt, &MyGptConfig); 
	
	/* Enable Timer interrupt */
	IRQ_enable(EventId0);             
	
	/* Enable all maskable interrupts */
	IRQ_globalEnable();      
	
	/* Start Timer */
	GPT_start(hGpt);
	 
	/* Config GPIO7 in order to ignite led D5*/  
	GPIODIR = 0x80;	// config the GPIO7 as output pin

	for(;;)
	{
	/* Enter system loop and waiting for interrupt */
	
	}		
}

/*定時器0的中斷程序*/
interrupt void Timer0Isr(void)
{
  	if(LEDMARK==0)
  	{
   		GPIODATA = 0x00;				/* 關閉指示燈D5 */
   		LEDMARK = 1;
  	}
  	else
  	{
  		GPIODATA = 0x80;				/* 打開指示燈D5 */
   		LEDMARK = 0;		
   		for(i=0;i<TIMECONST;i++)
   		{
   			for(j=0;j<100;j++)
   			{
   				CHIP_FSET(ST1_55,XF,0);	/* 關指示燈D1   */
   			}							
   		}			
  	}
}
  
/************************************************************************************/ 
/*注意: 	(1)	關閉指示燈D1只是臨時的,共計100*TIMECONST個指令周期					*/
/*			這種臨時性主要體現在關閉指示燈D1的操作是在中斷處理子程序中進行的		*/	
/*			而且是對CPU控制寄存器的操作,由于DSP的中斷保護和恢復機制					*/
/*			一旦退出中斷處理子程序,關閉指示燈D1的操作自動失效,即指示燈D1又自動點亮	*/
/************************************************************************************/

/******************************************************************************\
* End of 5502_LED.c
\******************************************************************************/