FC3v2 icm45686 threshold configuration

[driveraid]

Hi all, I'm developing some custom software on top of the madflight fc3v2 flight controller.

I've had serious issues enabling the threshold watermark interrupt of the ICM45686 IMU. Nothing I do after a few days of poking around seems to enable it. Other interrupts are working, interrupt generation on INT1 is working in general, the FIFO is filling with samples... but the threshold interrupt isn't working for me.

I'm wondering if you've succeeded in getting it working or if this is currently untested? One other possibility is maybe I've got a broken part...

[qqqlab]

Hmm, no idea, sorry...

You probably tried this already: change write_reg(0x001E, 0xff, 1); in:

 // setup FIFO - see AN-000478 ICM-45686 User Guide - 3.5 Setting up FIFO
    // (*) are additions
    write_reg(0x0021, 0b00001111, 0b00000000); //FIFO_CONFIG3 disable all fifo
    write_reg(0x0016, 0b00000010, 0b00000010); //INT1_CONFIG0 enable fifo threshold interrupt
    write_reg(0x0017, 0b11111111, 0b00000000); // (*) INT1_CONFIG1 disable apex interrupts
    write_reg(0x0018, 0b00000111, 0b00000001); // (*) INT1_CONFIG2 interrupt pushpull, pulse, active high    
    write_reg(0x001D, 0b11000000, 0b00000000); //FIFO_CONFIG0 fifo disabled
    write_reg(0xA258, 0b00000010, 0b00000010); //IPREG_TOP1:SMC_CONTROL_0 timestamp enable for fifo
    write_reg(0x001E, 0xff, 1);                //FIFO_CONFIG1_0 fifo watermark lsb
    write_reg(0x001F, 0xff, 0);                //FIFO_CONFIG1_0 fifo watermark msb
    write_reg(0x0020, 0b00001000, 0b00001000); //FIFO_CONFIG2 watermark interrupt on greater than or equal
    write_reg(0x0021, 0b00001110, 0b00001110); //FIFO_CONFIG3 enable HIRES, GYRO, ACC
    write_reg(0x001D, 0b11000000, 0b11000000); //FIFO_CONFIG0 fifo enabled
    write_reg(0x0021, 0b00000001, 0b00000001); //FIFO_CONFIG3 enable interface

[driveraid]

Thanks for responding, yeah I saw that. Can you confirm whether the threshold interrupt is tested? I didn't quite understand how the driver is used/called from an interrupt perspective.