dsp實驗-定時器

1、實驗三：定時器、實驗原理2.定時器中斷周期TINT rate 一Input clock rate(TDDR + 1) x (PRO + 1)3.實驗功能：通過XF管腳控制LED閃動以一定規(guī)律進行閃爍二、硬件資源及在片外圍電路 硬件資源：DSP芯片、CPU、LED、蜂鳴器、電阻、電容等在片外圍電路：時鐘發(fā)生器、定時器、通用輸入/輸出口等三、參數(shù)設(shè)置CPU 工作時鐘：*clkmd =0x21b3;0010000110110011CLKOUT=18M中斷頻率：9/* PRSC 4bit*/18M/9000=2KHZ四、實驗流程圖五、程序#include #include #include #incl

2、ude #include 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,= 1 */ TIMER_TCR_SOFT_BRKPTNOW,SOFT = 0 */ TIMER_TCR_FREE_WITHSOFT,FREE = 0 */ TIMER_TCR_PWID_OF(0),PWID = 0 */ TIMER_TCR_ARB_RESET,AR

3、B = 1 */ /*/*/* TLB/*/*/*/*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

4、 registers.*/* TCR0 */TIMER_Config timCfg0 = TIMER_CTRL,/ 0x3400u,/* PRD0 0x3400=13312*/14400,/* PRD0 16bit0x3400=144000=14400*10*/* PRSC 4bit*/;/ 中斷頻率 =Fcpu/(9000*1)=144MHz/13312=1kHzUint16 eventId0;/* Create a TIMER_Handle object for use with TIMER_open */ TIMER_Handle mhTimer0;volatile Uint16 tim

5、er0_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 library - This is REQUIRED ! */*CLS 庫的初始化，這是必需的 */CSL_init();/* Set IVPH/IVPD to start of interrupt vector table */* 修改寄存器 IVPH ， IVPD

6、，重新定義中斷向量表 */ IRQ_setVecs(Uint32)(&VECSTART);/* Temporarily disable all maskable interrupts */* 禁止所有可屏蔽的中斷源 */old_intm = IRQ_globalDisable();/* Open Timer 0, set registers to power on defaults */* 打開定時器 0，設(shè)置其為上電的的默認值，并返回其句柄 */ mhTimer0 = TIMER_open(TIMER_DEV0,TIMER_OPEN_RESET);/* Get Event Id associ

7、ated with Timer 0, for use with */* CSL interrupt enable functions.*/* 獲取定時器 0 的中斷 ID 號 */eventId0 = TIMER_getEventId(mhTimer0);/* Clear any pending Timer interrupts */*清除定時器 0的中斷狀態(tài)位 */IRQ_clear(eventId0);/* Place interrupt service routine address at */* associated vector location */* 為定時器 0 設(shè)置中斷服務程

8、序 */ IRQ_plug(eventId0,&timer0Isr);/* Write configuration structure values to Timer controlregs */*設(shè)置定時器 0 的控制與周期寄存器 */TIMER_config(mhTimer0, &timCfg0);/* Enable Timer interrupt */* 使能定時器的中斷 */IRQ_enable(eventId0);/* Enable all maskable interrupts */* 設(shè)置寄存器 ST1 的 INTM 位，使能所有的中斷 */ IRQ_globalEnable()

9、;/* Start Timer */* 啟動定時器 0*/TIMER_start(mhTimer0);ms=0;for(;)/ Wait for at least 10 timer periods/ 等待 10 個定時周期if(xfchange = 0)/點亮XF的LEDCHIP_FSET(ST1_55,XF,1);else/ 關(guān)掉 XF 的 LEDCHIP_FSET(ST1_55,XF,0);/* Restore old value of INTM */* 恢復 INTM 舊的值 */ IRQ_globalRestore(old_intm);/* We are through with timer, so close it */ /* 關(guān)掉定時器 0*/TIMER_close(mhTimer0);/*