I am trying to collect accelerometer, gyroscope, and temperature data from the ASM330LHH IMU sensor via SPI by timestamping the exact moment the data is generated. I have connected the INT1 pin of the sensor to the STM32H735RGV6 microcontroller’s PB0 pin and configured it as an external interrupt input. I enabled both the data-ready (DRDY) interrupt and the FIFO threshold interrupt by setting the appropriate registers (CTRL3_C, INT1_CTRL, MD1_CFG, FIFO_CTRL1, FIFO_CTRL3, FIFO_CTRL5, etc.). I verified that SPI communication is working correctly — I can read raw sensor data via polling mode, and the WHO_AM_I register returns the correct device ID. However, the INT1 pin does not toggle or pulse when configured for interrupt generation. I checked the INT1 pin using an oscilloscope and confirmed that it remains static. Additionally, DWT->CYCCNT is initialized and functional for timestamping.
Despite these checks, the interrupt callback (HAL_GPIO_EXTI_Callback()) never gets triggered when connected to the INT1 pin of the ASM330LHHXG1. It seems like the issue is not on the MCU side but on the sensor side — the sensor does not generate the interrupt. I would like to ask if there is a working example or reference configuration that sets up theASM330LHHXG1 sensor for interrupt generation over SPI using the STM32 HAL library. I am especially interested in a verified set of register writes or a working example project. Are there any known issues with interrupt signaling when using the sensor over SPI? Do I need to acknowledge or clear any specific flags after setting the configuration to make the INT1 pin toggle?
Any help or guidance would be greatly appreciated.
