TMS320C6747的定时器

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6747的定时器配置如下：

1. 设置引脚复用寄存器PINMUX8，将3脚功能选择为定时器输出，注意，该脚与I2C0的SCL重合。

（用户手册P203）

2. 设置定时器setup_TIMER0();在setup_TIMER0函数中清除TIMER0的高32位计数器TIMER34和低32位计数器TIMER12，然后选择32位unchained模式，预分频系数为1，设置周期数寄存器为周期值

(用户手册P1235)

3. 在中断复用寄存器INTmux1中选择CPU级中断的中断源，将CPU中断的中断源设置为定时器

(用户手册P72)

（MegaModule手册P178)

4. 设置ISTP为中断向量表的地址，将ISTP指向中断向量表

5. 清除所有中断标志

6. 使能非可屏蔽中断位，打开中断总开关GIE位

7. 使能定时器0的12部分和34部分，选择连续模式，同时，如果不使用TIMER1，务必将TIMER1禁用掉

8. 编写中断服务子程序，至此，程序就能定时执行中断服务程序了。

注意：6747的64位定时器用作32位unchainedmode的时候，分成Timer12和Timer34两部分，不用的那部分，在初始化TIMER_TCR的时候，千万要关闭，不要打开，不然会对中断产生影响，具体原因是，打开了该部分，但是又没有相应的中断处理程序，当发生中断时得不到正确处理，结果会导致另外所用的那部分32位定时器发生第一次中断后就再也不能再进入中断程序了，这点千万注意，不用的TIMER部分千万不要打开！！！

附上定时器程序（注释部分代码是用RCSL库写的，可不用）:

/* *  Core 6747 'led program. *  All by yanxu. */#include "stdio.h"#include "C6747.h"//const unsigned int TIMER_PERIOD = 0x00001000;const unsigned int TIMER_PERIOD = 0x00B71B00;static void setup_TIMER0(void);static void test_TIMERS(void);void myExit(int);void test_TIMERS(void);void TIMER0_TINT12_isr();static int TIMER0_TINT12_status = 1;          // Pass/Fail flagstatic int test_status = 1;                   // Test statusunsigned int k=0;extern const unsigned int TIMER_PERIOD;/*============================================================================*//*                        EXTERNAL FUNCTION PROTOTYPES                        *//*============================================================================*/extern void vectors(void);void delay(){ Uint32 i; for(i=0;i<0x1fffff;i++);}void main( void ){/*初始化6747核*/ C6747_init();  PINMUX11=0X08888888; PINMUX8=0x00040000; GPIO_DIR23=0;//设置IO为输出，控制LED //GPIO_DIR23=0xffffffff;/* for(;;) {GPIO_OUT_DATA23=0x800;//GPIO输出高电平  delay(); //延时  GPIO_OUT_DATA23=0x0;//GPIO输出低电平  delay();  //延时     }*/ /* Configure TIMER0, both halves to be used by application                */     setup_TIMER0(); /* function to test the timer interrupts                                  */     test_TIMERS();/*     for(;;)      {     GPIO_OUT_DATA23=0x800;//GPIO输出高电平     delay(); //延时     GPIO_OUT_DATA23=0x0;//GPIO输出低电平     delay();  //延时      }*/     while(1)     {     }}void setup_TIMER0 (void){    /* Clear TIM12 register                        *///    CSL_FINST(tmr0Regs->TIM12,TMR_TIM12_TIM12,RESETVAL);TIMER0_TIM12=0x0;    /* Clear TIM34 register                        *///    CSL_FINST(tmr0Regs->TIM34,TMR_TIM34_TIM34,RESETVAL);TIMER0_TIM34=0x0;    /* Select 32 bit unchained mode                */    /* Take the timer out of reset and set the pre-scalar count for 3:4       *//*    tmr0Regs->TGCR = CSL_FMKT(TMR_TGCR_TIMMODE,32BIT_UNCHAIN)                     | CSL_FMKT(TMR_TGCR_TIM12RS,NO_RESET)                     | CSL_FMKT(TMR_TGCR_TIM34RS,NO_RESET)                     | CSL_FMK(TMR_TGCR_PSC34,0x1);*/TIMER0_TGCR=0x00000107;    /* Set timer0 PRD1:2                           *///    CSL_FINS(tmr0Regs->PRD12,TMR_PRD12_PRD12,TIMER_PERIOD);TIMER0_PRD12=TIMER_PERIOD;    /* Set timer0 PRD3:4                           *//*    CSL_FINS(tmr0Regs->PRD34,TMR_PRD34_PRD34,TIMER_PERIOD);TIMER0_PRD34=TIMER_PERIOD;*/}static void test_TIMERS(void){    /* Interrupt Controller Register Overlay                                  */    printf("Testing TIMER0 and TIMER1 in unchained 32 bit mode.\n");    printf("Starting TIMER0 3:4 side and TIMER1 1:2 and 3:4 sides.\n");    /* connect the event to the interrupt 4,5,6 and 7                         *//*    CSL_FINS(intcRegs->INTMUX1, INTC_INTMUX1_INTSEL4,TIMER_EVENT0);    CSL_FINS(intcRegs->INTMUX1, INTC_INTMUX1_INTSEL5,TIMER_EVENT1);    CSL_FINS(intcRegs->INTMUX1, INTC_INTMUX1_INTSEL6,TIMER_EVENT2);    CSL_FINS(intcRegs->INTMUX1, INTC_INTMUX1_INTSEL7,TIMER_EVENT3);*/    INTmux1=0x30284004;    /* set ISTP to point to the vector table address                          */    ISTP = (unsigned int)vectors;    /* clear all interrupts, bits 4 thru 15                                   */    ICR = 0xFFF0;    /* enable the bits for non maskable interrupt and                         */    IER = 0xF2;    /* enable interrupts, set GIE bit                                         */    _enable_interrupts();    delay();    /* Enable TIMER0 1:2 side, one shot mode                                  */ /*   CSL_FINST(tmr0Regs->TCR,TMR_TCR_ENAMODE12,EN_ONCE);    TIMER0_TRC=0x00400040;*/    /* Enable TIMER0 1:2 side, continuous mode                                  */    TIMER0_TRC=0x00000080;    /* Enable TIMER0 3:4 side, one shot mode                                  *//*    CSL_FINST(tmr0Regs->TCR,TMR_TCR_ENAMODE34,EN_ONCE);*/    /* Enable TIMER1 1:2 side, one shot mode                                  *//*    CSL_FINST(tmr1Regs->TCR,TMR_TCR_ENAMODE12,EN_ONCE);*/    TIMER1_TRC=0x00000000;    /* Enable TIMER1 3:4 side, one shot mode                                  *//*    CSL_FINST(tmr1Regs->TCR,TMR_TCR_ENAMODE34,EN_ONCE);*/    /* Sleep for 3 system clock PRD's to ensure other timers have ran.        *     * Since 3:4 sides are running at a divide by 2 PRD, we need to           *     * sleep at least 2 PRDs.                                                 */    delay();    do    {        /* Check if interrupts occurred       */        test_status = TIMER0_TINT12_status;        delay();    }while (test_status != 0);    /* Call exit function                     */    myExit(test_status);}interrupt void TIMER0_TINT12_isr(){    /* Disable TIMER0 1:2 side                *//*    CSL_FINST(tmr0Regs->TCR,TMR_TCR_ENAMODE12,DISABLE);TIMER0_TRC=0x00000000;*/    /* Set flag to 0 indicating ISR occurred  */    TIMER0_TINT12_status=0;    k=(k+1)%2;    if(k==0)    {    GPIO_OUT_DATA23=0x800;//GPIO输出高电平    }    else    {    GPIO_OUT_DATA23=0x0;//GPIO输出低电平    }}void myExit(int test_result){    /* Disable TIMER0 1:2 side  *//*    CSL_FINST(tmr0Regs->TCR,TMR_TCR_ENAMODE12,DISABLE);TIMER0_TRC=0x00000000;*/    /* Disable TIMER0 3:4 side  *//*    CSL_FINST(tmr0Regs->TCR,TMR_TCR_ENAMODE34,DISABLE);*/    /* Disable TIMER1 1:2 side  *//*    CSL_FINST(tmr1Regs->TCR,TMR_TCR_ENAMODE12,DISABLE);*//*TIMER1_TRC=0x00000000;*/    /* Disable TIMER1 3:4 side  *//*    CSL_FINST(tmr1Regs->TCR,TMR_TCR_ENAMODE34,DISABLE);*/    /* Turn off all interrupts  *//*    _disable_interrupts();*/    /* Display test status      */    if (test_result == 0)    {        printf("Timer0 and Timer1 interrupt test: PASSED.\n");    }    else    {        printf("Timer0 and Timer1 interrupt test: FAILED.\n");    }}

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