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    SOLVED

    BHI 160无法产生Host Interrupt信号

    zhouy
    Member

    BHI 160无法产生Host Interrupt信号

    当使用ACTIVITY_RECOGNITION功能时,如果不读取FIFO,Host Interrupt信号一直不会产生,需要一直读取FIFO,INT引脚才会发出中断信号。但是这样就无法通过INT引脚唤醒MCU,另外,ORIENTATION功能也是这种情况,无法在读FIFO之前发出Host Interrupt信号。

    以下是配置代码:

    if (bhy_install_sensor_callback(VS_TYPE_ACTIVITY_RECOGNITION,  VS_WAKEUP,  sensors_callback_basic))
    {
            return -GERRNO_INTER_M_ERR;
    }

    if (bhy_enable_virtual_sensor(VS_TYPE_ACTIVITY_RECOGNITION,  VS_WAKEUP,  1,  0,  VS_FLUSH_NONE,  0,  0))
    {
            return -GERRNO_INTER_M_ERR;
    }

    8 REPLIES 8
    BSTRobin
    Community Moderator

    Re: BHI 160无法产生Host Interrupt信号

    Hello zhouy,

    中断信号的实际波形,方便用逻辑分析仪抓一下吗?

    另外,你的MCU端配置的中断触发方式是什么样的?

    zhouy
    Member

    Re: BHI 160无法产生Host Interrupt信号

    您好!

    固件为Bosch_PCB_7183_di03_BMI160_BMM150-7183_di03.2.1.11696_170103.h

    MCU外部中断采用下降沿触发。

    下图为上电后INT的波形,调用bhy_enable_virtual_sensor函数后INT引脚电平一直没有变化,维持在高电平。

    int.png

    zhouy
    Member

    Re: BHI 160无法产生Host Interrupt信号

    您好!

             我又测试了读FIFO和不读FIFO两种情况下INT引脚波形的对比图,不读FIFO时,INT引脚一直保持高电平;每10ms读一次FIFO时,INT大部分时间为低电平,当检测到运动后,会出现一个短暂的高电平。

    int1.png

    BSTRobin
    Community Moderator

    Re: BHI 160无法产生Host Interrupt信号

    Hello zhouy,

    加载完固件后,中断引脚默认是低电平。当检测到VS_TYPE_ACTIVITY_RECOGNITION等事件时,中断信号会拉高,所以host MCU端的中断触发方式要设置为上升沿。当host MCU接收到中断信号时,需要读取FIFO数据以清空FIFO,这样中断信号才会被拉低。

    BHI160 host interrupt behavior.png

    BHI160 host interrupt behavior-2.png

    BHI160 waveform.png

     

     

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