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    BMA400 Interrupt Status Register not reset

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    New Poster

    BMA400 Interrupt Status Register not reset

    I program an application, where the BMA is in low power mode, till an threshold is reached. After that, the BMA should read acceleration values, as long, as the interrupt is . The interrupt is only triggered once, when passing the ., so i thought, i read the GEN1triggeredthreshold status-bit and as long at it is set, i read the acceleration data. But the bit is only set to 1 and not reset. Any suggestions ?
    Here my configuration:

     

    //Auto-lowpower relative
        setRawRegisterValue(AUTOLOWPOW_1_REG_ADDR, 0b00000010);      //Configure Auto low Power when still standing
        //Generic interrupt 1 (gen1) relative
        setRawRegisterValue(GEN1INT_CONFIG0_REG_ADDR, 0b11111000);   //Interrupt Condition: all axes, 100 Hz, auto update, hyst disable
        setRawRegisterValue(GEN1INT_CONFIG1_REG_ADDR, 0b00000001);   //Interrupt Condition: all axes must be under  the threshold
        setRawRegisterValue(GEN1INT_CONFIG2_REG_ADDR, 0b00000101);   //Interrupt Condition: Set treshold to 5*8mg/lsb = 40mg
        setRawRegisterValue(GEN1INT_CONFIG3_REG_ADDR, 0b00000000);   //Interrupt Condition: Monitor Duration Cofig3*256+gonfig31 = 100 Samples
        setRawRegisterValue(GEN1INT_CONFIG31_REG_ADDR, 0b01100100);   //Interrupt Condition: Monitor Duration 100 sample /100Hz = 1s
        //Auto-wakeup relative
        setRawRegisterValue(AUTOWAKEUP_1_REG_ADDR, 0b00000010);   //Configure Auto wakeup to switch from lowpower to normal mode
        //Wakeup interrupt relative
        setRawRegisterValue(WKUP_INT_CONFIG0_REG_ADDR, 0b11101110);   // Interrupt Condition: all Axis; 3/4 Samples; auto update
        setRawRegisterValue(WKUP_INT_CONFIG1_REG_ADDR, 0b00000011);   // Interrupt Condition: Wakeup threshold 94 mg @4g range
        setRawRegisterValue(AUTOLOWPOW_1_REG_ADDR, 0b00000010);      //Configure Auto wakeup to switch from lowpower to normal mode
        //HW Interrupt
        setRawRegisterValue(INT_CONFIG0_REG_ADDR, 0b00000100);   //Enable Gen1 Interrupt
        setRawRegisterValue(INT1_MAP_REG_ADDR, 0b00000100);   //Map Interrupts to Pin1 (Gen1 Interrupt)
        //setRawRegisterValue(INT1_MAP_REG_ADDR, 0b00000101);   //Map Interrupts to Pin (Gen1 + Wake Up Interrupt)
        setRawRegisterValue(INT2_MAP_REG_ADDR, 0b00000001);   //Map Interrupts to Pin2 (Wake Up Interrupt)
        setRawRegisterValue(INT12_IO_CTRL_REG_ADDR, 0b00100010);   //Configure Interrupt Behavior


    Here the function that checks the status register for bit 3 set:

    bool BMA400_Gen1_Intr_status(){
        int value =getRawRegisterValue(INT_STAT0_REG_ADDR, 1);
        if(value&0x04){
            return true;
        }else{
            return false;
        }
    }

     

    Tags (4)
    3 REPLIES 3
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    Community Moderator

    Re: BMA400 Interrupt Status Register not reset

    Hello Jones, 

     

    I'm little confused about your code because you are using your own definition. 

    But, generally you set wake-up threshold and always get INT_STATUS_0 value as 1. 

    I think because you enable x,y,z all axes and threshold is 90mg. 

    If BMA400 is on your board, X value should be 1g. Therefore, it is over 90mg. 

    That's why you already get wake-up interrupt, and never reset. 

    Simply, please test after disable x and only enable y,z. You could get the right result what you want 🙂 

    Thanks, 

     

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    New Poster

    Re: BMA400 Interrupt Status Register not reset

    Oh then I'm confused.
    Because as you can see, I mappped the interrupts to the interrupt-pins. My microcontroller, only gehts triggerd when i shake the bma.
    Isn't the 90mg change ? So when there is 90mg change in 1 seconde for example ?

    Thanks allready for your help.
    Jones

    Highlighted
    Community Moderator

    Re: BMA400 Interrupt Status Register not reset

    Hello Jones, 

     

    I don't understand your reply fully. 

    I mean you enable x,y,z all axes and your threshold is 90mg. 

    Let's say if BMA400 is on your board. Z value should be around 1G right? ( Reversely -1 G) 

    Therefore, Z value is always over your threshold for your wake up threshold, so can't be reset. 

    To be specific, even though you reset mandatory, it will be set again right after. 

    Thanks,  

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