[求助]Timebase Module 128分频中断工作，但是主程序不正常 Module, 主程序, Timebase, 求助

qiudelu

我调试GZ60 Timebase Module,32768分频中断工作正常，中断执行能回到主程序，128分频中断工作，但是主程序不正常，好像进入不了主循环。

会不会是DELAY()的执行周期大于Timebase 中断周期造成的？

我想用Timebase中断实现160微秒延时，8M晶振，可行吗？

请斑主和高手过目，先谢！

#include <hidef.h>
#include "derivative.h"

unsigned int  Time;   

void Delay(unsigned int n)
{
            unsigned int stopTime;

            stopTime = Time+n;

            while (stopTime > Time);
}

void main(void) {
                        int i=0;
                        CONFIG2=0x09; //TBMCLKSEL=0

                        CONFIG1 =0x4B; //禁止看门狗

                        DDRF  = 0xFF;
                        PTF = 0x00; 
                        Time=0;

                        TBCR_TBIE =1;//2 基础定时器中断使能
                        TBCR_TACK =1;//3 清除中断标志

                        TBCR_TBR2 =0;//6 分频系数8192，1.024ms
                        TBCR_TBR1 =1;//5
                        TBCR_TBR0 =1;//4

                        TBCR_TBIF =1;//7 中断标志
                        TBCR_TBON =1;//0 启动定时器

                        EnableInterrupts;

                        for(;;) {

                                    Delay(1);
                                    PTF_PTF4=~PTF_PTF4;
                                    PTF_PTF5=~PTF_PTF5;
                                    PTF_PTF6=~PTF_PTF6;
                                    PTF_PTF7=~PTF_PTF7;
                        }

}

void interrupt 17 TBM_ISR(void){

            TBCR_TACK=1; 
            Time++;
            if (Time>=65534)
            {
                        Time=0;
            }
}

 

qiudelu

怎么没人回呀，自己顶了

qiudelu

我把project发上来了

qiudelu

我把project发上来了
http://bbs.chinaecnet.com/uploadImages/testtime1.zip

qiudelu

还没人回呀，自己顶了

strongchen

你可以先把TimeBase中断关掉或延长试试。

qiudelu

收到，延长timebase中断周期试过了2048分频也不行，

完全关掉还没有试，因为有个死循环，看门狗是关的，逻辑上程序没法跳出delay(),完全关掉的目的是检验主程序吗？

谢谢

zhwdy81

128分频好像定时器是16us吧？
中断根本就出不来啊

qiudelu

你好zhwdy81，128分频就是16us，

我也想知道中断需要多久才可以返回，freescale有文档说明还是要自己计算呀？

seuafu2005

中断多久返回取决于你中断函数的长短
你可以根据汇编语句自己计算

yhliqce

用Full Chip Simulation走一次可以帮你计算指令周期数

qiudelu

明白一些了。
freescale 技术支持回复如下
You are using the TBM prescaler = 128 which results into 16us interrupt
period. Your TBM interrupt code takes 43 bus cycles and because you
haven't set the CGM the bus runs at 2MHz. So your interrupt code lasts
43/2000000 = 21.5us and before it could be finished another pending TBM
interrupt is entered.

You can set the PLL so that bus runs at 8MHz or use higher TBM
prescaler (2048) Attached is the example with 8MHz bus clock.

NOTE: If you debug your code in monitor mode, the PLL is bypassed and
bus clock = XTAL / 4 which is in your case also 2MHz

也谢谢斑主和众高手