DSP5509的定时器实验-第2篇

1. 导入Easy5509开发板的例程EX02_TIME，5509有2个16位的定时器，有点少啊

2. 直接编译，提示找不到CSL.h，其实我也好奇，CSL库是从哪里来的？RTS库从哪里来的？头文件在哪里？上个实验的时候，我发现CSL有个安装包，去官网找了一下安装包http://www.ti.com/tool/sprc133

3. 安装CSL库，在CCS中增加头文件搜索路径，程序编译通过。

4. 看下主程序，主程序比较简单，有几个关键点，包含的库文件

 #include <stdio.h>
 #include <csl.h>
 #include <csl_irq.h>
 #include <csl_timer.h>
 #include <csl_chiphal.h>

 extern void VECSTART(void);

 #define TIMER_CTRL    TIMER_TCR_RMK(\
                       TIMER_TCR_IDLEEN_DEFAULT,    /* IDLEEN == 0 */ \
                       TIMER_TCR_FUNC_OF(),        /* FUNC   == 0 */ \
                       TIMER_TCR_TLB_RESET,         /* TLB    == 1 */ \
                       TIMER_TCR_SOFT_BRKPTNOW,     /* SOFT   == 0 */ \
                       TIMER_TCR_FREE_WITHSOFT,     /* FREE   == 0 */ \
                       TIMER_TCR_PWID_OF(),        /* PWID   == 0 */ \
                       TIMER_TCR_ARB_RESET,         /* ARB    == 1 */ \
                       TIMER_TCR_TSS_START,         /* TSS    == 0 */ \
                       TIMER_TCR_CP_PULSE,          /* CP     == 0 */ \
                       TIMER_TCR_POLAR_LOW,         /* POLAR  == 0 */ \
                       TIMER_TCR_DATOUT_0           /* DATOUT == 0 */ \
 )  

 TIMER_Config timCfg0 = {
    TIMER_CTRL,               /* TCR0 */
    0x3400u,                  /* PRD0 */
    0x0000                    /* PRSC */
 };

 Uint16 eventId0;  

 TIMER_Handle mhTimer0;

 volatile Uint16 timer0_cnt = ;

 /* Function/ISR prototypes */
 interrupt void timer0Isr(void);
 void taskFxn(void);

 int old_intm;
 Uint16 tim_val;
 Uint16 xfchange = ;
 Uint16 ms,f;

 void main(void)
 {
      /* Initialize CSL library - This is REQUIRED !!! */
      /*CLS库的初始化，这是必需的*/
      CSL_init();

      /* Set IVPH/IVPD to start of interrupt vector table */
      /*修改寄存器IVPH，IVPD，重新定义中断向量表*/
      IRQ_setVecs((Uint32)(&VECSTART));

      /* Temporarily disable all maskable interrupts */
     /*禁止所有可屏蔽的中断源*/
     old_intm = IRQ_globalDisable();   

     /* Open Timer 0, set registers to power on defaults */
     /*打开定时器0，设置其为上电的的默认值，并返回其句柄*/
     mhTimer0 = TIMER_open(TIMER_DEV0, TIMER_OPEN_RESET);

     /* Get Event Id associated with Timer 0, for use with */
     /* CSL interrupt enable functions.                    */
     /*获取定时器0的中断ID号*/
     eventId0 = TIMER_getEventId(mhTimer0);

     /* Clear any pending Timer interrupts */
     /*清除定时器0的中断状态位*/
     IRQ_clear(eventId0);

     /* Place interrupt service routine address at */
     /* associated vector location */
     /*为定时器0设置中断服务程序*/
     IRQ_plug(eventId0,&timer0Isr);

     /* Write configuration structure values to Timer control regs */
     /*设置定时器0的控制与周期寄存器*/
     TIMER_config(mhTimer0, &timCfg0);  

     /* Enable Timer interrupt */
     /*使能定时器的中断*/
     IRQ_enable(eventId0);             

     /* Enable all maskable interrupts */
     /*设置寄存器ST1的INTM位，使能所有的中断*/
     IRQ_globalEnable();      

     /* Start Timer */
     /*启动定时器0*/
     TIMER_start(mhTimer0);

     //以下是原来的TIMER子段
     f=;
     ms=;
     for(;;)
     {
         // Wait for at least 10 timer periods
         //等待10个定时周期
         if(xfchange == )
         {
            //点亮XF的LED
            CHIP_FSET(ST1_55,XF,);
         }
         else
         {
             //关掉XF的LED
               CHIP_FSET(ST1_55,XF,);
         }
     }
      /* Restore old value of INTM */
     /*恢复INTM旧的值*/
     IRQ_globalRestore(old_intm);

     /* We are through with timer, so close it */
     /*关掉定时器0*/
     TIMER_close(mhTimer0);
 }

5. 中断服务函数

 interrupt void timer0Isr(void)
 {
     ms++;
     ++timer0_cnt;
     if(timer0_cnt == f)
     {
         xfchange = ;
         f=f-;
         if(f==)
           f=;
     }
     if(timer0_cnt == *f)
     {
         timer0_cnt = ;
         xfchange = ;
         f=f-;
         if(f==)
           f=;
     }
 }