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 Forum index » DIY Hardware and Software » Microcontrollers and Programmable Logic
Why have No Any Return Signal When Initialization
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ailex1995



Joined: Apr 13, 2017
Posts: 3
Location: china
PostPosted: Thu Jun 15, 2017 11:19 pm    Post subject: Why have No Any Return Signal When Initialization
Subject description: Troubles inthe initialization of DS18B20		 Reply with quote  Mark this post and the followings unread
Why have no any Return signal When Initialization
Hello~
Can you help me have a see my time sequence ? What’s wrong here?

Code:
/*ds1820 restoration-----------------------------------------------------------------*/
int16 ds1820rst()
{
        int16 flag=0;
        EALLOW;
        GpioCtrlRegs.GPBMUX2.bit.GPIO55= 0;  //0 general io
        DQ_DIR=1;//output situation
        EDIS;
        DQ=1;
        DSP28x_usDelay(10);    //delay
        DQ=0;
        DSP28x_usDelay(600);    //delay
        DQ=1;

        DSP28x_usDelay(30);

        EALLOW;
        GpioCtrlRegs.GPBMUX2.bit.GPIO55= 0;  //0 general io
        DQ_DIR=1;//input situation
        EDIS;
        if(DQ==0)
        flag=DQ;
        return flag;
}


This is the datasheet of DS18B20-PAR+T&R , I don’t know why there are no any return signal when in the process of initialization? Are there any wrongs in my program ?
Thanks in advance!
Blessing~
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Grumble



Joined: Nov 23, 2015
Posts: 1295
Location: Netherlands
Audio files: 30
PostPosted: Fri Jun 16, 2017 3:59 am    Post subject: Reply with quote  Mark this post and the followings unread
Looks like there is a typo here:
DQ_DIR=1;//output situation
DQ_DIR=1;//input situation
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ailex1995



Joined: Apr 13, 2017
Posts: 3
Location: china
PostPosted: Sun Jun 18, 2017 6:51 pm    Post subject: Reply with quote  Mark this post and the followings unread
Grumble wrote:
Looks like there is a typo here:
DQ_DIR=1;//output situation
DQ_DIR=1;//input situation


Right, Embarassed
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