[经验] DSP28335定时器和外部输入中断

zhoumi

外部中断初始化
#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
. i" @' y5 c' n# Z% \void InitExtInt(void)
{
     EALLOW;
% C, J3 F: f( T2 P! x6 r     GpioCtrlRegs.GPAMUX1.bit.GPIO13 = 0;
4 W4 k! ]- \' I- G8 {     GpioCtrlRegs.GPADIR.bit.GPIO13 = 0;           //作为输入IO口
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
+ _1 H+ s  ]: c' m$ `7 p; lEDIS;
}
0 z5 Y3 n' h; G4 g
//外部中断1服务函数  ，按下按键，进中断，亮灯响鸣
( t. M  Z3 p, j# y4 T  kinterrupt void ISRExint1(void)
6 F) _: u; L: s' f/ o- K7 \{
        PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
; O8 r6 M' Z! Y" qDELAY_US(1000);
$ Q+ g- d( i0 D. r1 |# qif(GpioDataRegs.GPADAT.bit.GPIO13 == 0)
, _) u4 k$ j; d& @, C{
    LED4=~LED4;
: ^( E$ Q/ Z2 M$ y8 r    BUZZ_ON
8 u  k- c  `6 h/ v# B    DELAY_US(100000);
( i+ J% O  T% ^3 p/ U4 r    BUZZ_OFF
& a" K3 Y8 m* L# j) f; U      DELAY_US(100000);
    BUZZ_ON
    DELAY_US(100000);
& k; W. V! g& Q, }7 Y6 u, b1 j    BUZZ_OFF
, }* n+ Z; U# N    }
4 y: c6 y$ W* ~2 R}


, ]6 x+ }; U6 L% s% F定时器0，1，2中断初始化
    InitCpuTimers();   // For this example, only initialize the Cpu Timers
6 C+ X9 z5 B: G) q- V0 Y8 f    ConfigCpuTimer(&CpuTimer0, 150, 500000);  // 500us 150MHz CPU Freq, 1 second Period (in uSeconds)
    ConfigCpuTimer(&CpuTimer1, 150, 1000000);
" F- ~8 {. Z. X/ q; x; ^7 P    ConfigCpuTimer(&CpuTimer2, 150, 3000000);
    StartCpuTimer0();
7 L% f5 c- C/ @1 T, S9 q- ?  E    StartCpuTimer1();
    StartCpuTimer2();
' V3 r( v% Z$ c4 M6 ~) Q, f( {. H
8 b+ S/ h4 S% j  T
#include "timer.h"
3 e: |- M! K: ]* v4 j& K' Tinterrupt void ISRTimer0(void)
; h. }" T& `8 `( K+ O{
    static u8 timer0_count=0;
8 Z, Z: l; y9 Z// 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
" ?0 f) p& M7 t" s9 {7 y; ^    CpuTimer0Regs.TCR.bit.TIF=1; // 定时到了指定时间，标志位置位，清除标志
" }. D' ~1 R( M' J) P    CpuTimer0Regs.TCR.bit.TRB=1;  // 重载Timer0的定时数据
- @5 Y) u4 M' Y; R
    timer0_count++;
" A- s, u9 D# X. u0 |7 n    if(timer0_count==4)  //2000ms =2s
$ O' [& X3 x8 ]; l    {
    timer0_count =0;
    LED1=~LED1;
" f, Y4 c) n( j: H% ^0 I* ?+ u9 ~    }
}


# g7 p2 M4 k0 O) B% H- \//1s
interrupt void ISRTimer1(void)
{
0 e$ l. _' }" m, M; _3 k& U; p    static u8 timer1_count=0;
// Acknowledge this interrupt to receive more interrupts from group 1
* l0 `* ^6 u8 b/ R$ [) |" I    //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
    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

& o2 }4 p; ~, N8 A0 V! M% x+ P9 o    timer1_count++;
    if(timer1_count==1)
, `+ i7 g3 i" b9 e1 k) c, K  N, s) r    {
    timer1_count =0;
    LED2=~LED2;
    }
}

7 E3 K* q2 I; E) M7 s; d//3s
+ X* {8 a! T$ c" s0 ~interrupt void ISRTimer2(void)
{
0 E$ t7 `8 f1 E) B( t    static u8 timer2_count=0;
3 z4 A9 b- [- [" I5 Z// 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
    CpuTimer2Regs.TCR.bit.TIF=1; // 定时到了指定时间，标志位置位，清除标志
* ?# y( y3 p% Z! d" K/ K+ k    CpuTimer2Regs.TCR.bit.TRB=1;  // 重载Timer0的定时数据

    timer2_count++;
    if(timer2_count==1)
) b6 R! W9 x* h7 q' g( R    {
    timer2_count =0;
    //LED3=~LED3;
    }
}

指定中断服务函数地址
     EALLOW;  //  protected registers
    PieVectTable.XINT1 = &ISRExint1;  //外部中断1服务程序
    PieVectTable.TINT0 = &ISRTimer0;   //定时器0中断服务
    PieVectTable.XINT13 = &ISRTimer1;   //定时器1中断服务
    PieVectTable.TINT2  =  &ISRTimer2;    //定时器2中断服务
2 g' S/ e+ I- A% \* p/ |    EDIS;    // This is needed to disable write to EALLOW protected registers

开CPU级中断
    IER |= M_INT1;    //开启CPU中断 组1
    IER |= M_INT13;   //开启CPU中断 13   XINT13 / CPU-Timer1
    IER |= M_INT14;   //开启CPU中断 组14 TINT2
8 x" S# Q1 {! c* I: j: g) L2 \   
    PieCtrlRegs.PIEIER1.bit.INTx7= 1;  //CPU定时器 TIMER0中断   组1的第4个中断使能
9 x; n' Q8 ?1 A: z' C    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
7 Z/ M: L2 D: l. m
    EINT;   //开启全局中断
0 W* X) ^0 K5 P) u% g    ERTM;   //开启全局实时中断，调试用DBGM

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