diff --git a/example/README.md b/example/README.md index aa287a2..db1920b 100644 --- a/example/README.md +++ b/example/README.md @@ -23,6 +23,8 @@ The FIFO "engine" samples/appends another set of [x y z] values at 1/ODR. The ma Note: FIFO will not trigger a watermark interrupt (`pin1.wtm`) if the FIFO size is default (32; maximum size). To use the watermark interrupt, the FIFO size has to be between [1-31]. An overrun interrupt (`pin1.overrun`) will always trigger when the FIFO is full, regardless of programmed capacity. +Note: to sample data faster than 200 Hz, it is necessary to use the regular data polling functionality using `lis3dh_read()` with the appropriate configuration. See files `simple.c` and `fast.c` for examples. + ### file: single-click.c Set up single-click detection (no latching interrupt possible) diff --git a/example/fast.c b/example/fast.c new file mode 100644 index 0000000..c3459d1 --- /dev/null +++ b/example/fast.c @@ -0,0 +1,53 @@ +#define _GNU_SOURCE /* usleep() */ +#include /* usleep() */ +#include +#include "lis3dh.h" +#include "i2c.h" + +int main() { + + lis3dh_t lis; + + 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 struct and check device id */ + if (lis3dh_init(&lis)) { + /* error handling */ + } + + /* reset just in case*/ + if (lis3dh_reset(&lis)) { + /* error handling */ + } + + lis.cfg.mode = LIS3DH_MODE_LP; /* Low-power mode */ + lis.cfg.range = LIS3DH_FS_2G; + lis.cfg.rate = LIS3DH_ODR_LP_5376_HZ; /* 5 KHz ODR, only available in low-power mode */ + + /* write cfg to device */ + if (lis3dh_configure(&lis)) { + /* error handling */ + } + + for ( ;; ) { + + /* read accelerometer and store results at struct lis.acc */ + if (lis3dh_read(&lis)) { + /* error handling */ + } + + /* print data .. */ + printf("x: %4.4d mg, y: %4.4d mg, z: %4.4d mg\n", lis.acc.x, lis.acc.y, lis.acc.z); + } + + /* deinitalise device */ + if (lis3dh_deinit(&lis)) { + /* error handling */ + } + + return 0; +} \ No newline at end of file diff --git a/example/simple.c b/example/simple.c index a4fb4d5..4d9507d 100644 --- a/example/simple.c +++ b/example/simple.c @@ -26,7 +26,7 @@ int main() { lis.cfg.mode = LIS3DH_MODE_HR; lis.cfg.range = LIS3DH_FS_4G; - lis.cfg.rate = LIS3DH_ODR_100_HZ; + lis.cfg.rate = LIS3DH_ODR_400_HZ; /* write device config */ if (lis3dh_configure(&lis)) {