151 lines
4.3 KiB
C
151 lines
4.3 KiB
C
#ifndef LIS3DH_H
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#define LIS3DH_H
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#include <stdint.h>
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/* rates */
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#define LIS3DH_ODR_POWEROFF 0x00
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#define LIS3DH_ODR_1_HZ 0x01
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#define LIS3DH_ODR_10_HZ 0x02
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#define LIS3DH_ODR_25_HZ 0x03
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#define LIS3DH_ODR_50_HZ 0x04
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#define LIS3DH_ODR_100_HZ 0x05
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#define LIS3DH_ODR_200_HZ 0x06
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#define LIS3DH_ODR_400_HZ 0x07
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#define LIS3DH_ODR_NORM_1344_HZ 0x09
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#define LIS3DH_ODR_LP_1600_HZ 0x08
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#define LIS3DH_ODR_LP_5376_HZ 0x09
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/* range/sens */
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#define LIS3DH_FS_2G 0x00
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#define LIS3DH_FS_4G 0x01
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#define LIS3DH_FS_8G 0x02
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#define LIS3DH_FS_16G 0x03
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/* operating modes */
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#define LIS3DH_MODE_HR 0x00
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#define LIS3DH_MODE_LP 0x01
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#define LIS3DH_MODE_NORMAL 0x02
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/* FIFO modes */
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#define LIS3DH_FIFO_MODE_BYPASS 0x00
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#define LIS3DH_FIFO_MODE_NORMAL 0x01 /* "FIFO" */
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#define LIS3DH_FIFO_MODE_STREAM 0x02
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#define LIS3DH_FIFO_MODE_STREAM_TO_FIFO 0x03
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/* FIFO trigger pin selection */
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#define LIS3DH_FIFO_TRIG_INT1 0x00
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#define LIS3DH_FIFO_TRIG_INT2 0x01
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/* filter modes */
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/* this one is reset by reading REFERENCE (0x26) */
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#define LIS3DH_FILTER_MODE_NORMAL 0x00
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#define LIS3DH_FILTER_MODE_REFERENCE 0x01
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#define LIS3DH_FILTER_MODE_NORMAL2 0x02 /* same as 00? */
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#define LIS3DH_FILTER_MODE_AUTORESET 0x03
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/* filter cutoff */
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/* unfortunately, there is only a table for low-power mode,
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and the actual cutoff-frequency depends on the ODR.
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Naming scheme after ODR@400Hz
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AN3308 > section 4.3.1.1 */
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#define LIS3DH_FILTER_CUTOFF_8 0x00 /* highest freq */
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#define LIS3DH_FILTER_CUTOFF_4 0x01
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#define LIS3DH_FILTER_CUTOFF_2 0x02
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#define LIS3DH_FILTER_CUTOFF_1 0x03 /* lowest freq */
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/* user provided functions, init and deinit can be set to NULL and won't be used */
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struct lis3dh_device {
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int (*init)(void);
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int (*read)(uint8_t reg, uint8_t *dst, uint32_t size);
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int (*write)(uint8_t reg, uint8_t value);
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int (*sleep)(uint32_t dur_us);
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int (*deinit)(void);
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};
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/* config for INT2 trigger output */
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struct lis3dh_int2_config {
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uint8_t click; /* CLICK interrupt */
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uint8_t ia1; /* IA1 interrupt */
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uint8_t ia2; /* IA2 interrupt */
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uint8_t boot; /* enable BOOT on pin 2 */
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uint8_t act; /* interrupt on activity */
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uint8_t polarity; /* INT1 & INT2 polarity. 0 active high, 1 active low */
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uint8_t latch; /* latch interrupt until cleared */
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};
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/* config for INT1 trigger output */
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struct lis3dh_int1_config {
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uint8_t click; /* CLICK interrupt */
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uint8_t ia1; /* IA1 interrupt */
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uint8_t ia2; /* IA2 interrupt */
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uint8_t drdy_zyxda; /* new [xyz] data ready (not via FIFO) */
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uint8_t drdy_321; /* not sure */
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uint8_t wtm; /* FIFO reached watermark level */
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uint8_t overrun; /* FIFO has overrun */
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uint8_t latch; /* latch interrupt until cleared */
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};
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/* config for high-pass filter */
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struct lis3dh_filter_config {
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uint8_t mode; /* filter mode, reset behaviour */
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uint8_t cutoff; /* high-pass filter cutoff freq (~ ODR) */
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uint8_t fds; /* ¬(bypass filter) */
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uint8_t click; /* enable filter for CLICK function */
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uint8_t ia2; /* enable filter for AOI func on INT 2 */
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uint8_t ia1; /* enable filter for AOI func on INT 1 */
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};
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/* config for FIFO */
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struct lis3dh_fifo_config {
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uint8_t fth; /* user-specified watermark level 0-32 */
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uint8_t trig; /* pin to trigger when watermark/overrun occurs */
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uint8_t mode; /* FIFO mode */
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};
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struct lis3dh_config {
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uint8_t rate; /* ODR */
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uint8_t range; /* FS */
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uint8_t mode; /* LPen and HR */
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struct lis3dh_fifo_config fifo;
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struct lis3dh_filter_config filter;
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struct lis3dh_int1_config int1;
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struct lis3dh_int2_config int2;
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};
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/* data read not from FIFO is put here */
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struct lis3dh_acceleration {
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float x;
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float y;
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float z;
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};
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struct lis3dh {
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struct lis3dh_device dev;
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struct lis3dh_config cfg;
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struct lis3dh_acceleration acc;
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};
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typedef struct lis3dh lis3dh_t;
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/* struct for containing the FIFO data */
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struct lis3dh_fifo_data {
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uint8_t size; /* up to 32 */
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float x[32];
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float y[32];
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float z[32];
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};
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int lis3dh_init(lis3dh_t *lis3dh);
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int lis3dh_deinit(lis3dh_t *lis3dh);
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int lis3dh_configure(lis3dh_t *lis3dh);
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int lis3dh_poll(lis3dh_t *lis3dh);
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int lis3dh_read(lis3dh_t *lis3dh);
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int lis3dh_poll_fifo(lis3dh_t *lis3dh);
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int lis3dh_read_fifo(lis3dh_t *lis3dh, struct lis3dh_fifo_data *fifo);
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int lis3dh_clear_int1(lis3dh_t *lis3dh);
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int lis3dh_clear_int2(lis3dh_t *lis3dh);
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int lis3dh_reference(lis3dh_t *lis3dh);
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#endif |