#define _GNU_SOURCE #include #include #include #include #include "lis3dh.h" #include "interrupt.h" #include "i2c.h" #define GPIO_INTERRUPT_PIN_INT1 12 int main() { lis3dh_t lis; /* set fn ptrs to rw on bus (i2c or SPI) */ lis.dev.init = i2c_init; lis.dev.read = i2c_read; lis.dev.write = i2c_write; lis.dev.sleep = usleep; lis.dev.deinit = i2c_deinit; /* initialise 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_INT1)) { /* error handling */ } /* set up config */ lis.cfg.mode = LIS3DH_MODE_HR; lis.cfg.range = LIS3DH_FS_2G; lis.cfg.rate = LIS3DH_ODR_400_HZ; /* minimum recommended ODR */ lis.cfg.filter.mode = LIS3DH_FILTER_MODE_NORMAL_REF; lis.cfg.filter.cutoff = LIS3DH_FILTER_CUTOFF_8; lis.cfg.filter.click = 1; /* enable filtering for CLICK function */ lis.cfg.click.xs = 1; /* enable X axis single click */ lis.cfg.click.ys = 1; /* enable Y axis single click */ lis.cfg.click.zs = 1; /* enable Z axis single click */ lis.cfg.pin1.click = 1; /* enable CLICK INT through pin1 */ /* 1 LSb = 16 mg @ FS_2G * so a 0.3g 'shock' is 300/16 = 18.75 * However, the device can have up to +- 40mg read error, add 40 mg * 0.34g => 340/16 ~= 21 * (Note: 0.34g and not 1.34g because of HP filter) */ lis.cfg.click_ths = 21; /* * Duration time is measured in N/ODR where: * --- N = The content of the intX_dur integer * --- ODR = the data rate, eg 100, 400... * [ODR] [1 LSb in milliseconds] * 400 2.5 * * At 400 ODR, * 20 ms = 20/2.5 = 8 */ lis.cfg.time_limit = 8; /* write device config */ if (lis3dh_configure(&lis)) { /* error handling */ } /* read REFERENCE to set filter to current accel field */ if (lis3dh_reference(&lis)) { /* error handling */ } /* read CLICK_SRC to clear previous interrupts, if any */ if (lis3dh_read_click(&lis)) { /* error handling */ } for(;;) { /* poll interrupt on INT1 pin */ if (int_poll(GPIO_INTERRUPT_PIN_INT1)) { /* error handling */ } /* read CLICK_SRC when interrupt has fired */ if (lis3dh_read_click(&lis)) { /* error handling */ } /* only print if SCLICK=1 */ if (LIS3DH_CLICK_SCLICK(lis.src.click)) { /* print data gathered from CLICK_SRC */ printf("Click: X=%d, Y=%d, Z=%d, Sign=%d, S_CLICK=%d, D_CLICK=%d\n", LIS3DH_CLICK_SRC_X(lis.src.click), LIS3DH_CLICK_SRC_Y(lis.src.click), LIS3DH_CLICK_SRC_Z(lis.src.click), LIS3DH_CLICK_SIGN(lis.src.click), LIS3DH_CLICK_SCLICK(lis.src.click), LIS3DH_CLICK_DCLICK(lis.src.click)); } } /* unregister interrupt */ if (int_unregister(GPIO_INTERRUPT_PIN_INT1)) { /* error handling */ } /* deinitalise struct */ if (lis3dh_deinit(&lis)) { /* error handling */ } return 0; }