[经验] DSP28335定时器和外部输入中断

zhoumi

外部中断初始化
( [" H! a0 Y! X* _& `* o#include "extint.h"
//按键和外部中断都用了GPIO13,查询和中断不能同时使用
void InitExtInt(void)
{
4 }, c5 ]  T/ T/ `     EALLOW;
     GpioCtrlRegs.GPAMUX1.bit.GPIO13 = 0;
. C6 z0 B: }. L( z, u% ^     GpioCtrlRegs.GPADIR.bit.GPIO13 = 0;           //作为输入IO口
8 q7 J8 s2 `) x- G, `GpioCtrlRegs.GPAQSEL1.bit.GPIO13= 0;          //和时钟同步
     GpioIntRegs.GPIOXINT1SEL.bit.GPIOSEL = 13;    //选择GPIO13为外部输入XINT1输入引脚
XIntruptRegs.XINT1CR.bit.POLARITY= 0;         //下降沿触发中断
XIntruptRegs.XINT1CR.bit.ENABLE = 1;          //使能XINT1中断
& C5 y8 ?! x5 B" H$ |EDIS;
  w8 q  Y# L' Z/ T0 f4 ~. S0 g}
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//外部中断1服务函数  ，按下按键，进中断，亮灯响鸣
1 E; O1 V3 |* A* iinterrupt void ISRExint1(void)
{
* b$ W* B# |* d, z7 ]        PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
DELAY_US(1000);
: L- a" M, m& I- ]if(GpioDataRegs.GPADAT.bit.GPIO13 == 0)
{
) q. f  i* }, d8 v1 h    LED4=~LED4;
9 L8 n4 M, L9 z  D    BUZZ_ON
    DELAY_US(100000);
. O0 ?% L: F" W: R    BUZZ_OFF
      DELAY_US(100000);
    BUZZ_ON
" b' d' c2 s! }2 c    DELAY_US(100000);
    BUZZ_OFF
  _$ P/ H- ~' g) P, b: n1 i* }* i9 `    }
0 P# X+ ^* E; S! g7 `% Z}


定时器0，1，2中断初始化
    InitCpuTimers();   // For this example, only initialize the Cpu Timers
+ j- n7 M) u& m6 Q! _    ConfigCpuTimer(&CpuTimer0, 150, 500000);  // 500us 150MHz CPU Freq, 1 second Period (in uSeconds)
9 T7 i+ p/ h& w9 d$ r: {    ConfigCpuTimer(&CpuTimer1, 150, 1000000);
    ConfigCpuTimer(&CpuTimer2, 150, 3000000);
    StartCpuTimer0();
    StartCpuTimer1();
6 d% K4 K- ?/ h0 o    StartCpuTimer2();


: P. P) h8 s- G/ ^0 f#include "timer.h"
interrupt void ISRTimer0(void)
0 a; `. ~0 I; O4 g{
  f8 F! R6 ~9 v, G    static u8 timer0_count=0;
! X, ^! C/ _" v* h1 Y, H// Acknowledge this interrupt to receive more interrupts from group 1
    PieCtrlRegs.PIEACK.all = PIEACK_GROUP1; //0x0001赋给12组中断ACKnowledge寄存器，对其全部清除，不接受其他中断
    CpuTimer0Regs.TCR.bit.TIF=1; // 定时到了指定时间，标志位置位，清除标志
    CpuTimer0Regs.TCR.bit.TRB=1;  // 重载Timer0的定时数据
4 `2 v1 r2 h2 |1 b( ]
    timer0_count++;
    if(timer0_count==4)  //2000ms =2s
1 t! n0 k& P% M" N. Y5 R    {
8 v+ e) t/ p0 v3 A* |/ G) e+ Y2 ^    timer0_count =0;
    LED1=~LED1;
2 p3 S4 {+ P% y2 @    }
}


//1s
interrupt void ISRTimer1(void)
  c" ^" B# \3 S- e5 i{
    static u8 timer1_count=0;
, v$ [2 G* Z0 P) U0 q$ Y' q// Acknowledge this interrupt to receive more interrupts from group 1
1 L# e7 K# i6 L2 R5 C) N7 Q' n    //PieCtrlRegs.PIEACK.all = PIEACK_GROUP1; //0x0001赋给12组中断ACKnowledge寄存器，对其全部清除，不接受其他中断
! Q/ K- ^: C7 r3 a6 P0 g! u, Y    CpuTimer1Regs.TCR.bit.TIF=1; // 定时到了指定时间，标志位置位，清除标志
    CpuTimer1Regs.TCR.bit.TRB=1;  // 重载Timer0的定时数据

    timer1_count++;
    if(timer1_count==1)
    {
    timer1_count =0;
" J6 C! J5 T) O0 Y' K, N) f    LED2=~LED2;
' v4 ^$ b0 Z1 x4 h) r    }
& y/ s! X+ R- a8 k- Q# n8 s}
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//3s
interrupt void ISRTimer2(void)
{
    static u8 timer2_count=0;
// Acknowledge this interrupt to receive more interrupts from group 1
    PieCtrlRegs.PIEACK.all = PIEACK_GROUP1; //0x0001赋给12组中断ACKnowledge寄存器，对其全部清除，不接受其他中断
& J4 h- }3 ~6 m. h, U" w    CpuTimer2Regs.TCR.bit.TIF=1; // 定时到了指定时间，标志位置位，清除标志
    CpuTimer2Regs.TCR.bit.TRB=1;  // 重载Timer0的定时数据

    timer2_count++;
3 A3 D; N# F; }3 B    if(timer2_count==1)
* F5 ?/ F3 E; K; w/ Q6 y    {
    timer2_count =0;
    //LED3=~LED3;
    }
7 c6 d- f6 ^" j! N% m" @8 T9 Z}

指定中断服务函数地址
0 j5 A5 m. A: d) U  ~% @8 D/ z     EALLOW;  //  protected registers
    PieVectTable.XINT1 = &ISRExint1;  //外部中断1服务程序
: W1 i1 `1 o: y% ~    PieVectTable.TINT0 = &ISRTimer0;   //定时器0中断服务
! F" u0 N/ a3 Q! ~- u+ V6 M    PieVectTable.XINT13 = &ISRTimer1;   //定时器1中断服务
    PieVectTable.TINT2  =  &ISRTimer2;    //定时器2中断服务
    EDIS;    // This is needed to disable write to EALLOW protected registers
5 C5 ^0 W1 b3 W& L: @/ v8 a" c/ \
; u( {: n0 T0 q) u9 V开CPU级中断
    IER |= M_INT1;    //开启CPU中断 组1
: d$ ?5 G+ p( T" \6 b6 J    IER |= M_INT13;   //开启CPU中断 13   XINT13 / CPU-Timer1
    IER |= M_INT14;   //开启CPU中断 组14 TINT2
   
    PieCtrlRegs.PIEIER1.bit.INTx7= 1;  //CPU定时器 TIMER0中断   组1的第4个中断使能
- d6 q: p0 A9 A6 p    CpuTimer1Regs.TCR.all = 0x4001; // 使能TIMER1 Use write-only instruction to set TSS bit = 0
    CpuTimer2Regs.TCR.all = 0x4001; // 使能TIMER2 Use write-only instruction to set TSS bit = 0

2 B, r, i5 m' \- y7 [9 F    EINT;   //开启全局中断
" D: E3 \" ~; Y9 }    ERTM;   //开启全局实时中断，调试用DBGM

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