float read_av_acc() has no return statement. So function returns nothing and crashes.

For no reason... DC Bias for example. But you answer is not an explanation

The code gpio_config_t io_conf = {}; gpio_num_t gpio_test_pin = GPIO_NUM_5; io_conf.intr_type = GPIO_INTR_DISABLE; io_conf.mode = GPIO_MODE_INPUT_OUTPUT_OD; io_conf.pin_bit_mask = BIT64(gpio_test_pin); io_conf.pull_down_en = 1; io_conf.pull_up_en = 1; gpio_config(&io_conf); gpio_dump_io_configuratio...