1 files changed, 59 insertions, 0 deletions
diff --git a/src/drivers/lsm303d/iirFilter.h b/src/drivers/lsm303d/iirFilter.h
new file mode 100644
index 000000000..ab4223a8e
--- /dev/null
+++ b/src/drivers/lsm303d/iirFilter.h
@@ -0,0 +1,59 @@
+#ifndef IIRFILTER__H__
+#define IIRFILTER__H__
+
+__BEGIN_DECLS
+
+#define MAX_LENGTH 4
+
+typedef struct FILTER_s
+{
+	float denData[MAX_LENGTH];
+	float numData[MAX_LENGTH];
+	int denLength;
+	int numLength;
+	float Ts;
+	float inpData[MAX_LENGTH];
+	float outData[MAX_LENGTH];
+	unsigned int inpCnt;
+} FIL_T;
+
+typedef struct TF_ZPG_s
+{
+	int    zerosLength;
+	double zerosData[MAX_LENGTH + 1];
+	int    polesLength;
+	double polesData[MAX_LENGTH + 1];
+	double gain;
+	double Ts;
+} TF_ZPG_t;
+
+typedef struct TF_POLY_s
+{
+	int    numLength;
+	double numData[MAX_LENGTH];
+	int    denLength;
+	double denData[MAX_LENGTH];
+	double Ts;
+} TF_POLY_t;
+
+typedef struct TF_DIF_s
+{
+	int    numInt;
+	int    numDiff;
+	int    lowpassLength;
+	int    highpassLength;
+	double lowpassData[MAX_LENGTH];
+	int    highpassData[MAX_LENGTH];
+	double gain;
+	double Ts;
+} TF_DIF_t;
+
+__EXPORT int testFunction(void);
+
+__EXPORT float updateFilter(FIL_T *pFilt, float inp);
+
+__EXPORT int initFilter(const TF_DIF_t *pDifc, double Ts, FIL_T *pFilt);
+
+__END_DECLS
+
+#endif