Diff: Middlewares/OpenPDM2PCM/OpenPDMFilter.h

Revision:

20:9952bef19da1

Parent:

16:4ab2eac7be21

--- a/Middlewares/OpenPDM2PCM/OpenPDMFilter.h	Thu May 04 10:39:39 2017 +0000
+++ b/Middlewares/OpenPDM2PCM/OpenPDMFilter.h	Fri May 05 11:34:10 2017 +0000
@@ -44,28 +44,36 @@
 
 /* Definitions ---------------------------------------------------------------*/
 
-#define HTONS(A) ((((uint16_t)(A) & 0xff00) >> 8) | \
-                 (((uint16_t)(A) & 0x00ff) << 8))
-
-
 /*
  * Enable to use a Look-Up Table to improve performances while using more FLASH
  * and RAM memory.
+ * Note: Without Look-Up Table up to stereo@16KHz configuration is supported.
  */
 #define USE_LUT
 
+#define SINCN            3
+#define DECIMATION_MAX 128
+#define FILTER_GAIN     16
+
+#define HTONS(A) ((((uint16_t)(A) & 0xff00) >> 8) | \
+                 (((uint16_t)(A) & 0x00ff) << 8))
+#define RoundDiv(a, b)    (((a)>0)?(((a)+(b)/2)/(b)):(((a)-(b)/2)/(b)))
+#define SaturaLH(N, L, H) (((N)<(L))?(L):(((N)>(H))?(H):(N)))
+
 
 /* Types ---------------------------------------------------------------------*/
 
 typedef struct {
   /* Public */
-  uint16_t Fs;
   float LP_HZ;
   float HP_HZ;
-  uint16_t In_MicChannels;
-  uint16_t Out_MicChannels;
+  uint16_t Fs;
+  uint8_t In_MicChannels;
+  uint8_t Out_MicChannels;
+  uint8_t Decimation;
+  uint8_t MaxVolume;
   /* Private */
-  uint32_t Coef[5];
+  uint32_t Coef[SINCN];
   uint16_t FilterLen;
   int64_t OldOut, OldIn, OldZ;
   uint16_t LP_ALFA;
@@ -78,7 +86,8 @@
 /* Exported functions ------------------------------------------------------- */
 
 void Open_PDM_Filter_Init(TPDMFilter_InitStruct *init_struct);
-void Open_PDM_Filter(uint8_t* data, uint16_t* data_out, uint16_t mic_gain, TPDMFilter_InitStruct *init_struct);
+void Open_PDM_Filter_64(uint8_t* data, uint16_t* data_out, uint16_t mic_gain, TPDMFilter_InitStruct *init_struct);
+void Open_PDM_Filter_128(uint8_t* data, uint16_t* data_out, uint16_t mic_gain, TPDMFilter_InitStruct *init_struct);
 
 #ifdef __cplusplus
 }