#define _GNU_SOURCE #include #include #include #include #include "lis3dh.h" #include "interrupt.h" #include "i2c.h" /* GPIO 12 or Pin 32 */ #define GPIO_INTERRUPT_PIN 12 int main() { lis3dh_t lis; struct lis3dh_fifo_data fifo; int i; lis.dev.init = i2c_init; lis.dev.read = i2c_read; lis.dev.write = i2c_write; lis.dev.sleep = usleep; lis.dev.deinit = i2c_deinit; /* initalise LIS3DH struct */ if (lis3dh_init(&lis)) { /* error handling */ } /* reset device just in case */ if (lis3dh_reset(&lis)) { /* error handling */ } /* register interrupt */ if (int_register(GPIO_INTERRUPT_PIN)) { /* error handling */ } lis.cfg.mode = LIS3DH_MODE_NORMAL; lis.cfg.range = LIS3DH_FS_2G; lis.cfg.rate = LIS3DH_ODR_100_HZ; lis.cfg.fifo.mode = LIS3DH_FIFO_MODE_STREAM; lis.cfg.fifo.trig = LIS3DH_FIFO_TRIG_INT1; /* trigger interrupt into int pin1 */ lis.cfg.pin1.overrun = 1; /* trigger upon FIFO overrun */ /* set up HP filter to remove DC component */ lis.cfg.filter.mode = LIS3DH_FILTER_MODE_NORMAL_REF; lis.cfg.filter.cutoff = LIS3DH_FILTER_CUTOFF_4; lis.cfg.filter.fds = 0; /* remove this line, or set to 1 to enable filter */ /* write device config */ if (lis3dh_configure(&lis)) { /* error handling */ } /* read REFERENCE to set filter to current accel field */ if (lis3dh_reference(&lis)) { /* error handling */ } /* wait for interrupt from LIS3DH */ if (int_poll(GPIO_INTERRUPT_PIN)) { /* error handling */ } /* read as many [x y z] sets as specified by watermark level (fth) */ /* copy them to the fifo data struct given below as `fifo' */ if (lis3dh_read_fifo(&lis, &fifo)) { /* error handling */ } /* above function also writes out the qty of [x y z] sets stored in `fifo' */ for(i=0; i