How to judge the interrupt pin

PX4 Autopilot Drivers & Sensors 🔧
1

i didn’t find function judge the interrupt pin

2

I have a question about MPU9250 SPI access. The schematic tells that the interrupt pin, namely DRDY, is connected to the MCU, but I did not find the relevant code in the firmware using the interrupt functionality. May I ask how MPU9250 is accessed via SPI?