[经验] DSP28335定时器和外部输入中断

zhoumi · 发表于 2016-6-28 14:50

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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
void InitExtInt(void)
{
   EALLOW;
   GpioCtrlRegs.GPAMUX1.bit.GPIO13 = 0;
   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
EDIS;
}

//外部中断1服务函数  ，按下按键，进中断，亮灯响鸣
interrupt void ISRExint1(void)
{
      PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
DELAY_US(1000);
if(GpioDataRegs.GPADAT.bit.GPIO13 == 0)
{
LED4=~LED4;
BUZZ_ON
DELAY_US(100000);
BUZZ_OFF
   DELAY_US(100000);
BUZZ_ON
DELAY_US(100000);
BUZZ_OFF
}
}

定时器0，1，2中断初始化
InitCpuTimers(); // For this example, only initialize the Cpu Timers
ConfigCpuTimer(&CpuTimer0, 150, 500000);  // 500us 150MHz CPU Freq, 1 second Period (in uSeconds)
ConfigCpuTimer(&CpuTimer1, 150, 1000000);
ConfigCpuTimer(&CpuTimer2, 150, 3000000);
StartCpuTimer0();
StartCpuTimer1();
StartCpuTimer2();

#include "timer.h"
interrupt void ISRTimer0(void)
{
static u8 timer0_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
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

timer0_count++;
if(timer0_count==4)  //2000ms =2s
{
timer0_count =0;
LED1=~LED1;
}
}

//1s
interrupt void ISRTimer1(void)
{
static u8 timer1_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
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;
LED2=~LED2;
}
}

//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
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++;
if(timer2_count==1)
{
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
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

PieCtrlRegs.PIEIER1.bit.INTx7= 1;  //CPU定时器 TIMER0中断组1的第4个中断使能
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

EINT; //开启全局中断
ERTM; //开启全局实时中断，调试用DBGM