Initial import of NFC GNSS SDK project

2026-09-15 16:10:12 +08:00
commit 2746cc3d4e
3070 changed files with 892062 additions and 0 deletions
@@ -0,0 +1,68 @@
+#ifndef _BIQUAD_IIR_H
+#define _BIQUAD_IIR_H
+
+
+
+typedef struct
+{	short xL[2];		//xL[0] = x0,xL[1] = x1
+	short xR[2];
+	int yL[2];
+	int yR[2];
+} BiquadIIRMemStruct;
+
+typedef struct
+{
+	BiquadIIRMemStruct EqFilterMemory[5];
+}EqFilterMemT;
+
+
+//ICAT EXPORTED STRUCT
+typedef struct
+{
+	short a[3];    // a[0], a[1], a[2]
+	short b[3];   // b[0], b[1], b[2]
+} BiQuadCoeffsStruct;
+
+//ICAT EXPORTED STRUCT
+typedef struct
+{
+	unsigned short BiquadEnControl;		//bit 0 ~bit 4 is on/off of each filter.
+	//unsigned short reserved0;
+	//short     reserve1;
+	BiQuadCoeffsStruct Tuningmem[5];	//get from user input or read workspace log
+}EqParamIn;
+
+
+void BiQuadIIRfilter(short *inputPtr_L, 
+                            short *inputPtr_R, 
+                            int step, 
+                            BiquadIIRMemStruct *filterMemoryPtr, 
+                            BiQuadCoeffsStruct *coeffsPtr, 
+                            short frameSize);
+
+
+void EQ_Func_48k(short *input_L, 
+                 short *input_R, int step, EqParamIn*  EqPtr);
+void EQ_Filter_Init(void);
+
+
+#if 0  // need to move into audio code
+EqParamIn  EqParameters ={
+        // unsigned short BiquadEnControl; 
+    //bit 0 ~bit 4 is on/off of each filter.
+    0x1,
+        //unsigned short reserved0;
+        //short     reserve1;
+    // BiQuadCoeffsStruct Tuningmem[5]; 
+    //get from user input or read workspace log
+    {   //for example a[0] =8192  norm_s(a[0])-1 = 2;
+        {2, -7989, 3106, 4425, -3994, 1224},
+        {1,  6367, 255 , 5590, 3184,  2729},
+        {1,  6367, 255 , 5590, 3184,  2729},
+        {1,  6367, 255 , 5590, 3184,  2729},
+        {1,  6367, 255 , 5590, 3184,  2729},
+    }
+};
+#endif
+
+#endif