DM642定时器能定时1us么，赋好初值后 实际试验中发现定时器中断内没任何指认 定时时间约为1.16us，内部指认愈多中断时间变的越长，我想问下这定时器中断是怎么工作的？从现象看好像是出定时器中断后计数器才开始重新计数，否则进中断周期不应该与中断服务函数内的指认有关？另外进栈出栈大概要多少时间 时钟是600M？
是中断结束后 定时器计数才开始重新计数么？为何中断内指认越多，进入中断时间周期越长，？定时周期不变
代码：
/* Header file created by DSP/BIOS tool */
#include "spicfgcfg.h"
#include <std.h>
#include <log.h>
#include <sys.h>
#include <mem.h>
#include <sio.h>
#include <csl.h>
#include <csl_cache.h>
#include <csl_irq.h>
#include <gio.h>
#define DRR0 *((unsigned char *)(0x018C0000))
#define DXR0 *((unsigned char *)(0x018C0004))
#define DRR1 *((unsigned char *)(0x01900000))
#define DXR1 *((unsigned char *)(0x01900004))
#define GPIO_EN (*((unsigned int*)(0x01b00000)))
#define GPIO_DIR (*((unsigned int*)(0x01b00004)))
#define GPIO_VAL (*((unsigned int*)(0x01b00008)))
#define GPIO_DH (*((unsigned int*)(0x01b00010)))
#define GPIO_HM (*((unsigned int*)(0x01b00014)))
#define GPIO_DL (*((unsigned int*)(0x01b00018)))
#define GPIO_LM (*((unsigned int*)(0x01b0001c)))
#define GPIO_GC (*((unsigned int*)(0x01b00020)))
#define GPIO_POL (*((unsigned int*)(0x01b00024)))
void InitGPIO(); //初始化GPIO接口
void SpiRcv0();
void SpiRcv1();
void MCBSP_init();
#define PRDValue0 0x0000004b // 1US
Uint32 x[100],y[100];
Uint32 i,j;
#pragma CODE_SECTION(timer1,".jpgtbls ");
#pragma CODE_SECTION(writed,".jpgtbls ");
#pragma CODE_SECTION(SpiRcv0,".jpgtbls ");
#pragma CODE_SECTION(SpiRcv1,".jpgtbls ");//定义到内部ISRAM
void writed();
Uint32 KK=0,l=0;
Uint32 x[100],y[100];
Uint32 i,j;
TIMER_Handle hTimer1;
Uint32 TimerEventid;
//定时器配置系数结构体
TIMER_Config MyConfig1=
{
0x00000305,//CTL
PRDValue0,//PRD
0x00000000,//CNT
};
void writed()
{
GPIO_VAL |= 0x00002002;
GPIO_VAL &= 0xffffdffd;
GPIO_VAL |= 0x00002002;
GPIO_VAL &= 0xffffdffd;
GPIO_VAL |= 0x00002002;
GPIO_VAL &= 0xffffdffd;
GPIO_VAL |= 0x00002002;
GPIO_VAL &= 0xffffdffd;
GPIO_VAL |= 0x00002002;
GPIO_VAL &= 0xffffdffd;//加上这几句后 通过示波器观察 发现进入此函数时间间隔变成2.2us 但定时时间初值为1us
}
//定时器1硬件中断 定时1us检测高速AD值
void timer1(void)
{
writed();//屏蔽这句通过仿真进入时间为1.16us
//SWI_post(&TIME_swi);
}
/*----------------------------------------------------------------------------*/
void main() {
volatile Uint32 y;
int success = 1;
CSL_init();
IRQ_globalEnable(); //IRQ global enable
IRQ_nmiEnable(); //NMIE
IRQ_enable(IRQ_EVT_RINT0); //McBSP0 interrupt enable
IRQ_enable(IRQ_EVT_RINT1); //McBSP1 interrupt enable
MCBSP_init();
InitGPIO();
//打开定时器0及GPIO口
hTimer1 = TIMER_open(TIMER_DEV1, 0);
//获取定时器0的事件号
TimerEventid = TIMER_getEventId(hTimer1);
//中断向量表的初始化
IRQ_globalEnable();
// IRQ_nmiEnable(); //NMIE
IRQ_enable(TimerEventid);
IRQ_enable(IRQ_EVT_RINT0); //McBSP0 interrupt enable
IRQ_enable(IRQ_EVT_RINT1); //McBSP1 interrupt enable
//对定时器0及GPIO口进行配置
TIMER_config(hTimer1, &MyConfig1);
//开始运行
TIMER_start(hTimer1);
}
//AD0 interrupt
void SpiRcv0()
{
x[i++] = DRR0;
if(i>99) i=0;
}
//AD1 interrupt
void SpiRcv1()
{
y[j++] = DRR1;
if(j>99) j=0;
}
void MCBSP_init()
{
MCBSP_enableSrgr(hMcbsp0);
MCBSP_enableRcv(hMcbsp0);
MCBSP_enableXmt(hMcbsp0);
MCBSP_enableFsync(hMcbsp0);
MCBSP_start(hMcbsp0,MCBSP_RCV_START | MCBSP_XMIT_START | MCBSP_SRGR_START| MCBSP_SRGR_FRAMESYNC, 0);
MCBSP_enableSrgr(hMcbsp1);
MCBSP_enableRcv(hMcbsp1);
MCBSP_enableXmt(hMcbsp1);
MCBSP_enableFsync(hMcbsp1);
MCBSP_start(hMcbsp1,MCBSP_RCV_START | MCBSP_XMIT_START | MCBSP_SRGR_START| MCBSP_SRGR_FRAMESYNC, 0);
}
void InitGPIO()
{
/* GPIO */
GPIO_EN = 0x0000ffff;
GPIO_DIR = 0x00002222;
}
/*----------------------------------------------------------------------------*/
/******************************************************************************
* End of main.c
******************************************************************************/
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