dsp实验：定时器答题.doc

实验三：定时器 实验原理 1.定时器的结构 定时器中断周期 3.实验功能：通过XF管脚控制LED闪动以一定规律进行闪烁。 硬件资源及在片外围电路 硬件资源： DSP芯片、CPU、LED、蜂鸣器、电阻、电容等 在片外围电路： 时钟发生器、定时器、通用输入/输出口等 参数设置 CPU工作时钟： *clkmd =0x21b3; 0010000110110011 CLKOUT=18M 中断频率： 9 /* PRSC 4bit*/ 18M/9000=2KHZ 实验流程图 程序 #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(0), /* FUNC == 0 */ TIMER_TCR_TLB_RESET, /* TLB == 1 */ TIMER_TCR_SOFT_BRKPTNOW, /* SOFT == 0 */ TIMER_TCR_FREE_WITHSOFT, /* FREE == 0 */ TIMER_TCR_PWID_OF(0), /* 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 */ ) /* Create a TIMER configuration structure that can be passed */ /* to TIMER_config CSL function for initialization of Timer */ /* control registers. */ TIMER_Config timCfg0 = { TIMER_CTRL, /* TCR0 */ // 0x3400u, /* PRD0 0x3400=13312*/ 14400, /* PRD0 16bit 0x3400=144000=14400*10*/ 9 /* PRSC 4bit*/ }; //中断频率=Fcpu/(9000*1)=144MHz/13312=1kHz Uint16 eventId0; /* Create a TIMER_Handle object for use with TIMER_open */ TIMER_Handle mhTimer0; volatile Uint16 timer0_cnt = 0; /* Function/ISR prototypes */ interrupt void timer0Isr(void); int old_intm; Uint16 tim_val; Uint16 xfchange = 0; Uint16 ms,f; void main(void) { /* Initialize CSL