Diff: Middlewares/OpenPDM2PCM/OpenPDMFilter.h

Revision:

2:9f389fd8fb2e

Child:

15:17bdadc6aa9c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Middlewares/OpenPDM2PCM/OpenPDMFilter.h	Fri Apr 21 10:33:08 2017 +0200
@@ -0,0 +1,84 @@
+/**
+  ******************************************************************************
+  * @file    OpenPDMFilter.h
+  * @author  CL
+  * @version V1.0.0
+  * @date    9-September-2015
+  * @brief   Header file for Open PDM audio software decoding Library.   
+  *          This Library is used to decode and reconstruct the audio signal
+  *          produced by ST MEMS microphone (MP45Dxxx, MP34Dxxx). 
+ ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT 2013 STMicroelectronics</center></h2>
+  *
+  * Licensed under MCD-ST Image SW License Agreement V2, (the "License");
+  * You may not use this file except in compliance with the License.
+  * You may obtain a copy of the License at:
+  *
+  *        http://www.st.com/software_license_agreement_image_v2
+  *
+  * Unless required by applicable law or agreed to in writing, software 
+  * distributed under the License is distributed on an "AS IS" BASIS, 
+  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  * See the License for the specific language governing permissions and
+  * limitations under the License.
+  *
+  ******************************************************************************
+  */
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+
+#ifndef __OPENPDMFILTER_H
+#define __OPENPDMFILTER_H
+
+#ifdef __cplusplus
+  extern "C" {
+#endif
+
+
+/* Includes ------------------------------------------------------------------*/
+
+#include <stdint.h>
+
+
+/* Definitions ---------------------------------------------------------------*/
+
+#define HTONS(A) ((((uint16_t)(A) & 0xff00) >> 8) | \
+                 (((uint16_t)(A) & 0x00ff) << 8))
+
+
+/* Types ---------------------------------------------------------------------*/
+
+typedef struct {
+  /* Public */
+  uint16_t Fs;
+  float LP_HZ;
+  float HP_HZ;
+  uint16_t In_MicChannels;
+  uint16_t Out_MicChannels;
+  uint16_t Decimation;
+  uint16_t SincN;	
+  /* Private */
+  uint32_t Coef[5];
+  uint16_t FilterLen;
+  int64_t OldOut, OldIn, OldZ;
+  uint16_t LP_ALFA;
+  uint16_t HP_ALFA;
+  uint16_t bit[5];
+  uint16_t byte;
+} TPDMFilter_InitStruct;
+
+
+/* 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);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // __OPENPDMFILTER_H
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/