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README.md
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@ -140,7 +140,13 @@ $ ./lis3dh
x: 0.534000, y: -0.882000, z: -0.102000 x: 0.534000, y: -0.882000, z: -0.102000
x: 0.538000, y: -0.866000, z: -0.136000 x: 0.538000, y: -0.866000, z: -0.136000
x: 0.518000, y: -0.846000, z: -0.100000 x: 0.518000, y: -0.846000, z: -0.100000
... x: 0.518000, y: -0.840000, z: -0.098000
x: 0.542000, y: -0.876000, z: -0.098000
x: 0.518000, y: -0.834000, z: -0.146000
x: 0.512000, y: -0.854000, z: -0.106000
x: 0.574000, y: -0.870000, z: -0.122000
x: 0.518000, y: -0.846000, z: -0.098000
x: 0.516000, y: -0.852000, z: -0.112000
``` ```
## Using FIFO ## Using FIFO
Instead of polling for every single [x y z] set, a FIFO with programmable capacity ("watermark") can be used like such: Instead of polling for every single [x y z] set, a FIFO with programmable capacity ("watermark") can be used like such:
@ -205,7 +211,35 @@ $ ./lis3dh
x: 0.544000, y: -0.904000, z: -0.104000 x: 0.544000, y: -0.904000, z: -0.104000
x: 0.536000, y: -0.880000, z: -0.104000 x: 0.536000, y: -0.880000, z: -0.104000
x: 0.528000, y: -0.880000, z: -0.104000 x: 0.528000, y: -0.880000, z: -0.104000
... x: 0.528000, y: -0.880000, z: -0.104000
x: 0.536000, y: -0.880000, z: -0.104000
x: 0.536000, y: -0.880000, z: -0.104000
x: 0.536000, y: -0.880000, z: -0.104000
x: 0.536000, y: -0.880000, z: -0.104000
x: 0.536000, y: -0.880000, z: -0.104000
x: 0.536000, y: -0.880000, z: -0.104000
x: 0.536000, y: -0.880000, z: -0.104000
x: 0.536000, y: -0.880000, z: -0.128000
x: 0.568000, y: -0.872000, z: -0.160000
x: 0.568000, y: -0.872000, z: -0.160000
x: 0.568000, y: -0.872000, z: -0.160000
x: 0.568000, y: -0.872000, z: -0.160000
x: 0.568000, y: -0.872000, z: -0.160000
x: 0.568000, y: -0.872000, z: -0.160000
x: 0.568000, y: -0.872000, z: -0.160000
x: 0.568000, y: -0.872000, z: -0.160000
x: 0.568000, y: -0.872000, z: -0.160000
x: 0.568000, y: -0.872000, z: -0.160000
x: 0.568000, y: -0.872000, z: -0.160000
x: 0.568000, y: -0.872000, z: -0.160000
x: 0.568000, y: -0.872000, z: -0.160000
x: 0.568000, y: -0.872000, z: -0.160000
x: 0.568000, y: -0.872000, z: -0.160000
x: 0.568000, y: -0.872000, z: -0.160000
x: 0.568000, y: -0.872000, z: -0.160000
x: 0.568000, y: -0.872000, z: -0.160000
x: 0.568000, y: -0.872000, z: -0.160000
x: 0.560000, y: -0.872000, z: -0.160000
``` ```
## Using the HP filter ## Using the HP filter
The LIS3DH can optionally apply a HP filter on the sample data. It can be used to greatly reduce the "DC acceleration" present. The LIS3DH can optionally apply a HP filter on the sample data. It can be used to greatly reduce the "DC acceleration" present.
@ -269,7 +303,35 @@ $ ./lis3dh
x: 0.008000, y: 0.000000, z: 0.000000 x: 0.008000, y: 0.000000, z: 0.000000
x: 0.000000, y: 0.000000, z: 0.016000 x: 0.000000, y: 0.000000, z: 0.016000
x: -0.016000, y: -0.008000, z: -0.008000 x: -0.016000, y: -0.008000, z: -0.008000
... x: -0.032000, y: 0.008000, z: 0.000000
x: 0.024000, y: -0.016000, z: -0.032000
x: 0.024000, y: -0.016000, z: -0.032000
x: 0.024000, y: -0.016000, z: -0.032000
x: 0.024000, y: -0.016000, z: -0.032000
x: 0.024000, y: -0.016000, z: -0.032000
x: 0.024000, y: -0.016000, z: -0.032000
x: 0.024000, y: -0.016000, z: -0.032000
x: 0.024000, y: -0.016000, z: -0.008000
x: -0.016000, y: -0.032000, z: -0.040000
x: -0.016000, y: -0.032000, z: -0.040000
x: -0.016000, y: -0.032000, z: -0.040000
x: -0.016000, y: -0.032000, z: -0.040000
x: -0.016000, y: -0.032000, z: -0.040000
x: -0.016000, y: -0.032000, z: -0.040000
x: -0.016000, y: -0.032000, z: -0.040000
x: -0.016000, y: -0.032000, z: -0.040000
x: -0.016000, y: -0.032000, z: -0.040000
x: -0.016000, y: -0.032000, z: -0.040000
x: -0.016000, y: -0.032000, z: -0.040000
x: -0.016000, y: -0.032000, z: -0.040000
x: -0.016000, y: -0.032000, z: -0.040000
x: -0.016000, y: -0.032000, z: -0.040000
x: -0.016000, y: -0.032000, z: -0.040000
x: -0.016000, y: -0.032000, z: -0.040000
x: -0.016000, y: -0.032000, z: -0.040000
x: -0.016000, y: -0.032000, z: -0.040000
x: -0.016000, y: -0.032000, z: -0.040000
x: -0.008000, y: -0.024000, z: -0.008000
``` ```
## Using interrupts ## Using interrupts
@ -349,10 +411,37 @@ int main() {
Output: Output:
``` ```
$ ./lis3dh $ ./lis3dh
0.2040 -1.0120 -0.1720 0.2040 -1.0120 -0.1720 1.0466
0.2200 -1.0200 -0.1600 0.2200 -1.0200 -0.1600 1.0557
0.2160 -1.0200 -0.1600 0.2160 -1.0200 -0.1600 1.0548
... 0.2120 -1.0240 -0.1600 1.0579
0.2200 -1.0160 -0.1760 1.0543
0.2080 -0.9960 -0.1720 1.0319
0.2080 -0.9960 -0.1760 1.0326
0.2200 -1.0200 -0.1600 1.0557
0.2200 -1.0160 -0.1560 1.0512
0.2160 -1.0200 -0.1600 1.0548
0.2120 -1.0240 -0.1520 1.0567
0.2200 -1.0240 -0.1520 1.0583
0.2160 -1.0200 -0.1520 1.0536
0.2160 -1.0200 -0.1560 1.0542
0.2080 -0.9960 -0.1760 1.0326
0.2200 -1.0240 -0.1600 1.0595
0.2120 -1.0000 -0.1720 1.0366
0.2120 -0.9960 -0.1760 1.0334
0.2200 -1.0240 -0.1600 1.0595
0.2200 -1.0200 -0.1600 1.0557
0.2080 -0.9960 -0.1640 1.0306
0.1920 -1.0080 -0.1600 1.0385
0.2080 -1.0080 -0.1600 1.0416
0.2200 -1.0240 -0.1520 1.0583
0.2080 -1.0000 -0.1720 1.0358
0.2080 -0.9960 -0.1480 1.0282
0.2040 -1.0240 -0.1560 1.0557
0.2200 -1.0240 -0.1560 1.0589
0.2120 -1.0040 -0.1520 1.0373
0.2120 -1.0200 -0.1560 1.0534
0.2200 -1.0240 -0.1560 1.0589
``` ```
### Using i2c on STM32 ### Using i2c on STM32

1
main.c
View File

@ -17,6 +17,7 @@ float mag(float x, float y, float z) {
/* print message then exit */ /* print message then exit */
void quit(const char *msg, lis3dh_t *lis) { void quit(const char *msg, lis3dh_t *lis) {
lis->dev.deinit(); lis->dev.deinit();
int_unregister(GPIO_INTERRUPT_PIN);
fprintf(stderr, "%s\n", msg); fprintf(stderr, "%s\n", msg);
exit(1); exit(1);
} }