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examples and more debug flags

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This commit is contained in:
William Clark 2023-12-30 13:10:40 +00:00
parent 365bb369bb
commit 5bde365c65
10 changed files with 287 additions and 337 deletions
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3
Makefile
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@ -1,6 +1,7 @@
CC=gcc
CFLAGS=-O0 -g3 -ggdb -std=c89 -W -Werror -Wall -Wextra -Wpedantic -pedantic-errors -Wformat-signedness -I.
CFLAGS+=-Wlogical-op -Wmissing-declarations -Wswitch-default -Wundef -Wformat=2
CFLAGS+=-Wlogical-op -Wmissing-declarations -Wswitch-default -Wundef -Wformat=2 -lasan
CFLAGS+=-fsanitize=pointer-overflow,undefined,shift,shift-exponent,shift-base,integer-divide-by-zero,null,signed-integer-overflow,bounds
LFLAGS=-lm
CFILES=$(wildcard *.c)
all:

325
README.md
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@ -32,331 +32,6 @@ All above functions return `0` on success.
The `init` and `deinit` pointers can both be set to `NULL` and they won't be run.
## Usage
Simple example:
```c
#define _GNU_SOURCE
#include <unistd.h> /* usleep() */
#include <stdio.h>
#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;
if (lis3dh_init(&lis)) {
/* error handling */
}
lis.cfg.mode = LIS3DH_MODE_HR;
lis.cfg.range = LIS3DH_FS_4G;
lis.cfg.rate = LIS3DH_ODR_100_HZ;
if (lis3dh_configure(&lis)) {
/* error handling */
}
if (lis3dh_poll(&lis)) {
/* error handling */
}
if (lis3dh_read(&lis)) {
/* error handling */
}
printf("x: %f, y: %f, z: %f\n", lis.acc.x, lis.acc.y, lis.acc.z);
if (lis3dh_deinit(&lis)) {
/* error handling */
}
return 0;
}
```
The output should be something similar to this:
```
$ ./lis3dh
x: 0.540000, y: -0.882000, z: -0.100000
```
poll() and read() can be indefinitely looped for a constant data stream, like this:
```c
#define _GNU_SOURCE
#include <unistd.h>
#include <stdio.h>
#include "lis3dh.h"
#include "i2c.h"
int main() {
lis3dh_t lis;
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;
if (lis3dh_init(&lis)) {
/* error handling */
}
lis.cfg.mode = LIS3DH_MODE_HR;
lis.cfg.range = LIS3DH_FS_4G;
lis.cfg.rate = LIS3DH_ODR_100_HZ;
if (lis3dh_configure(&lis)) {
/* error handling */
}
for(i=0; i<10; i++) {
if (lis3dh_poll(&lis)) {
/* error handling */
}
if (lis3dh_read(&lis)) {
/* error handling */
}
printf("x: %f, y: %f, z: %f\n", lis.acc.x, lis.acc.y, lis.acc.z);
}
if (lis3dh_deinit(&lis)) {
/* error handling */
}
return 0;
}
```
Output:
```
$ ./lis3dh
x: 0.534000, y: -0.882000, z: -0.102000
x: 0.538000, y: -0.866000, z: -0.136000
x: 0.518000, y: -0.846000, z: -0.100000
...
```
## Using FIFO
Instead of polling for every single [x y z] set, a FIFO with programmable capacity ("watermark") can be used like such:
All FIFO readings use 10-bit resolution regardless of the mode set in `lis.cfg.mode`.
The watermark level can also be adjusted to a value [0-31] inclusive by modifying the `lis.cfg.fifo.fth` property before calling configure().
```c
#define _GNU_SOURCE
#include <unistd.h>
#include <stdio.h>
#include "lis3dh.h"
#include "i2c.h"
int main() {
lis3dh_t lis;
struct lis3dh_fifo_data data;
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;
if (lis3dh_init(&lis)) {
/* error handling */
}
lis.cfg.mode = LIS3DH_MODE_HR;
lis.cfg.range = LIS3DH_FS_4G;
lis.cfg.rate = LIS3DH_ODR_100_HZ;
lis.cfg.fifo.mode = LIS3DH_FIFO_MODE_NORMAL;
if (lis3dh_configure(&lis)) {
/* error handling */
}
if (lis3dh_poll_fifo(&lis)) {
/* error handling */
}
if (lis3dh_read_fifo(&lis, &data)) {
/* error handling */
}
/* read out fifo buffer data */
for(i=0; i<data.size; i++) {
printf("x: %f, y: %f, z: %f\n", data.x[i], data.y[i], data.z[i]);
}
if (lis3dh_deinit(&lis)) {
/* error handling */
}
return 0;
}
```
Output:
```
$ ./lis3dh
x: 0.544000, y: -0.904000, z: -0.104000
x: 0.536000, y: -0.880000, z: -0.104000
x: 0.528000, y: -0.880000, z: -0.104000
...
```
## 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.
```c
#define _GNU_SOURCE
#include <unistd.h>
#include <stdio.h>
#include "lis3dh.h"
#include "i2c.h"
int main() {
lis3dh_t lis;
struct lis3dh_fifo_data data;
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;
if (lis3dh_init(&lis)) {
/* error handling */
}
lis.cfg.mode = LIS3DH_MODE_HR;
lis.cfg.range = LIS3DH_FS_4G;
lis.cfg.rate = LIS3DH_ODR_100_HZ;
lis.cfg.fifo.mode = LIS3DH_FIFO_MODE_NORMAL;
lis.cfg.filter.mode = LIS3DH_FILTER_MODE_AUTORESET;
lis.cfg.filter.cutoff = LIS3DH_FILTER_CUTOFF_8;
if (lis3dh_configure(&lis)) {
/* error handling */
}
if (lis3dh_poll_fifo(&lis)) {
/* error handling */
}
if (lis3dh_read_fifo(&lis, &data)) {
/* error handling */
}
/* read out fifo buffer data */
for(i=0; i<data.size; i++) {
printf("x: %f, y: %f, z: %f\n", data.x[i], data.y[i], data.z[i]);
}
if (lis3dh_deinit(&lis)) {
/* error handling */
}
return 0;
}
```
Output:
```
$ ./lis3dh
x: 0.008000, y: 0.000000, z: 0.000000
x: 0.000000, y: 0.000000, z: 0.016000
x: -0.016000, y: -0.008000, z: -0.008000
...
```
## Using interrupts
The LIS3DH supports two different interrupt "output pins," `INT1` and `INT2`. The appropriate flag must be set in either `cfg.int1` or `cfg.int2` (only one of such flags can be set at a time!) and the interrupt source must be configured to trigger into `INT1` or `INT2`. Below is example code that listens and receives an interrupt when the FIFO watermark is reached i.e. it is full.
```c
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <math.h>
#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 k;
lis.dev.init = i2c_init;
lis.dev.read = i2c_read;
lis.dev.write = i2c_write;
lis.dev.sleep = usleep;
lis.dev.deinit = i2c_deinit;
if (lis3dh_init(&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 into INT1 */
lis.cfg.int1.wtm = 1; /* trigger upon watermark level reached */
if (lis3dh_configure(&lis)) {
/* error handling */
}
/* wait for interrupt from LIS3DH */
if (int_poll(GPIO_INTERRUPT_PIN)) {
/* error handling */
}
if (lis3dh_read_fifo(&lis, &fifo)) {
/* error handling */
}
for(k=0; k<fifo.size; k++) {
printf("%04.04f %04.04f %04.04f %04.04f\n", fifo.x[k], fifo.y[k], fifo.z[k]);
}
/* unregister interrupt */
if (int_unregister(GPIO_INTERRUPT_PIN)) {
/* error handling */
}
if (lis3dh_deinit(&lis)) {
/* error handling */
}
return 0;
}
```
Output:
```
$ ./lis3dh
0.2040 -1.0120 -0.1720
0.2200 -1.0200 -0.1600
0.2160 -1.0200 -0.1600
...
```
### Using i2c on STM32
Simple example code

12
example/README.md Normal file
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@ -0,0 +1,12 @@
# lis3dh/example
### simple/
Basic examples of how to use this device
### fifo/
Instead of polling for every single [x y z] set, a FIFO with programmable capacity ("watermark") can be used like such: All FIFO readings use 10-bit resolution regardless of the mode set in `lis.cfg.mode`. The watermark level can also be adjusted to a value [0-31] inclusive by modifying the `lis.cfg.fifo.fth` property before calling configure().
The LIS3DH can optionally apply a HP filter on the sample data. It can be used to greatly reduce the "DC acceleration" present.
### interrupts/
The LIS3DH supports two different interrupt "output pins," `INT1` and `INT2`. The appropriate flag must be set in either `cfg.int1` or `cfg.int2` (only one of such flags can be set at a time!) and the interrupt source must be configured to trigger into `INT1` or `INT2`. Below is example code that listens and receives an interrupt when the FIFO watermark is reached i.e. it is full.

50
example/fifo/fifo.c Normal file
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@ -0,0 +1,50 @@
#define _GNU_SOURCE
#include <unistd.h>
#include <stdio.h>
#include "lis3dh.h"
#include "i2c.h"
int main() {
lis3dh_t lis;
struct lis3dh_fifo_data data;
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;
if (lis3dh_init(&lis)) {
/* error handling */
}
lis.cfg.mode = LIS3DH_MODE_HR;
lis.cfg.range = LIS3DH_FS_4G;
lis.cfg.rate = LIS3DH_ODR_100_HZ;
lis.cfg.fifo.mode = LIS3DH_FIFO_MODE_NORMAL;
if (lis3dh_configure(&lis)) {
/* error handling */
}
if (lis3dh_poll_fifo(&lis)) {
/* error handling */
}
if (lis3dh_read_fifo(&lis, &data)) {
/* error handling */
}
/* read out fifo buffer data */
for(i=0; i<data.size; i++) {
printf("x: %f, y: %f, z: %f\n", data.x[i], data.y[i], data.z[i]);
}
if (lis3dh_deinit(&lis)) {
/* error handling */
}
return 0;
}

52
example/fifo/fifo2.c Normal file
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@ -0,0 +1,52 @@
#define _GNU_SOURCE
#include <unistd.h>
#include <stdio.h>
#include "lis3dh.h"
#include "i2c.h"
int main() {
lis3dh_t lis;
struct lis3dh_fifo_data data;
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;
if (lis3dh_init(&lis)) {
/* error handling */
}
lis.cfg.mode = LIS3DH_MODE_HR;
lis.cfg.range = LIS3DH_FS_4G;
lis.cfg.rate = LIS3DH_ODR_100_HZ;
lis.cfg.fifo.mode = LIS3DH_FIFO_MODE_NORMAL;
lis.cfg.filter.mode = LIS3DH_FILTER_MODE_AUTORESET;
lis.cfg.filter.cutoff = LIS3DH_FILTER_CUTOFF_8;
if (lis3dh_configure(&lis)) {
/* error handling */
}
if (lis3dh_poll_fifo(&lis)) {
/* error handling */
}
if (lis3dh_read_fifo(&lis, &data)) {
/* error handling */
}
/* read out fifo buffer data */
for(i=0; i<data.size; i++) {
printf("x: %f, y: %f, z: %f\n", data.x[i], data.y[i], data.z[i]);
}
if (lis3dh_deinit(&lis)) {
/* error handling */
}
return 0;
}

68
example/interrupts/interrupts.c Normal file
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@ -0,0 +1,68 @@
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <math.h>
#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 k;
lis.dev.init = i2c_init;
lis.dev.read = i2c_read;
lis.dev.write = i2c_write;
lis.dev.sleep = usleep;
lis.dev.deinit = i2c_deinit;
if (lis3dh_init(&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 into INT1 */
lis.cfg.int1.wtm = 1; /* trigger upon watermark level reached */
if (lis3dh_configure(&lis)) {
/* error handling */
}
/* wait for interrupt from LIS3DH */
if (int_poll(GPIO_INTERRUPT_PIN)) {
/* error handling */
}
if (lis3dh_read_fifo(&lis, &fifo)) {
/* error handling */
}
for(k=0; k<fifo.size; k++) {
printf("%04.04f %04.04f %04.04f %04.04f\n", fifo.x[k], fifo.y[k], fifo.z[k]);
}
/* unregister interrupt */
if (int_unregister(GPIO_INTERRUPT_PIN)) {
/* error handling */
}
if (lis3dh_deinit(&lis)) {
/* error handling */
}
return 0;
}

44
example/simple/simple.c Normal file
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@ -0,0 +1,44 @@
#define _GNU_SOURCE
#include <unistd.h> /* usleep() */
#include <stdio.h>
#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;
if (lis3dh_init(&lis)) {
/* error handling */
}
lis.cfg.mode = LIS3DH_MODE_HR;
lis.cfg.range = LIS3DH_FS_4G;
lis.cfg.rate = LIS3DH_ODR_100_HZ;
if (lis3dh_configure(&lis)) {
/* error handling */
}
if (lis3dh_poll(&lis)) {
/* error handling */
}
if (lis3dh_read(&lis)) {
/* error handling */
}
printf("x: %f, y: %f, z: %f\n", lis.acc.x, lis.acc.y, lis.acc.z);
if (lis3dh_deinit(&lis)) {
/* error handling */
}
return 0;
}

48
example/simple/simple2.c Normal file
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@ -0,0 +1,48 @@
#define _GNU_SOURCE
#include <unistd.h>
#include <stdio.h>
#include "lis3dh.h"
#include "i2c.h"
int main() {
lis3dh_t lis;
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;
if (lis3dh_init(&lis)) {
/* error handling */
}
lis.cfg.mode = LIS3DH_MODE_HR;
lis.cfg.range = LIS3DH_FS_4G;
lis.cfg.rate = LIS3DH_ODR_100_HZ;
if (lis3dh_configure(&lis)) {
/* error handling */
}
for(i=0; i<10; i++) {
if (lis3dh_poll(&lis)) {
/* error handling */
}
if (lis3dh_read(&lis)) {
/* error handling */
}
printf("x: %f, y: %f, z: %f\n", lis.acc.x, lis.acc.y, lis.acc.z);
}
if (lis3dh_deinit(&lis)) {
/* error handling */
}
return 0;
}

8
i2c.c
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@ -23,12 +23,12 @@ static int fd;
int i2c_init(void) {
fd = open(I2C_DEVICE, O_RDWR);
if (fd < 0) {
fprintf(stderr, "could not open device: %s\n", I2C_DEVICE);
fprintf(stderr, "[i2c] could not open device: %s\n", I2C_DEVICE);
return 1;
}
if (ioctl(fd, I2C_SLAVE, I2C_LIS3DH_ADDRESS) < 0) {
fprintf(stderr, "failed to acquire bus/talk to slave\n");
fprintf(stderr, "[i2c] failed to acquire bus/talk to slave\n");
close(fd);
return 1;
}
@ -46,7 +46,7 @@ int i2c_read(uint8_t reg, uint8_t *dst, uint32_t size) {
write(fd, cmd, 2);
if (read(fd, dst, size) != (ssize_t)size) {
fprintf(stderr, "error read()\n");
fprintf(stderr, "[i2c] error read()\n");
return 1;
}
@ -62,7 +62,7 @@ int i2c_write(uint8_t reg, uint8_t value) {
cmd[1] = value;
if (write(fd, cmd, 2) != 2) {
fprintf(stderr, "error write()\n");
fprintf(stderr, "[i2c] error write()\n");
return 1;
}

14
main.c
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@ -7,7 +7,8 @@
#include "interrupt.h"
#include "i2c.h"
#define GPIO_INTERRUPT_PIN 12
#define GPIO_INTERRUPT_PIN_INT1 12
#define GPIO_INTERRUPT_PIN_INT2 16
/* calc magnitude of accel [x y z] vector */
static float mag(float x, float y, float z) {
@ -41,7 +42,7 @@ int main() {
}
/* register interrupt */
if (int_register(GPIO_INTERRUPT_PIN)) {
if (int_register(GPIO_INTERRUPT_PIN_INT1)) {
quit("int_register()", &lis);
}
@ -50,10 +51,10 @@ int main() {
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;
lis.cfg.fifo.trig = LIS3DH_FIFO_TRIG_INT2;
lis.cfg.int1.wtm = 1;
lis.cfg.int1.latch = 1;
lis.cfg.filter.mode = LIS3DH_FILTER_MODE_REFERENCE;
lis.cfg.filter.mode = LIS3DH_FILTER_MODE_AUTORESET;
lis.cfg.filter.cutoff = LIS3DH_FILTER_CUTOFF_8;
@ -64,7 +65,7 @@ int main() {
for(i=0; i<50; i++) {
/* wait for interrupt from LIS3DH */
if (int_poll(GPIO_INTERRUPT_PIN)) {
if (int_poll(GPIO_INTERRUPT_PIN_INT1)) {
quit("int_poll()", &lis);
}
@ -83,11 +84,10 @@ int main() {
mag(fifo.x[k], fifo.y[k], fifo.z[k]));
}
lis3dh_reference(&lis);
}
/* unregister interrupt */
if (int_unregister(GPIO_INTERRUPT_PIN)) {
if (int_unregister(GPIO_INTERRUPT_PIN_INT1)) {
quit("int_unregister()", &lis);
}