Diff: pdm_filter.h

Revision:

0:3eee9435dd17

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pdm_filter.h	Sun Dec 13 19:12:11 2015 +0000
@@ -0,0 +1,77 @@
+/**
+  ******************************************************************************
+  * @file    pdm_filter.h
+  * @author  MCD Application Team
+  * @version V2.0.1
+  * @date    17-December-2013
+  * @brief   Header file for PDM audio software decoding Library.   
+  *          This Library is used to decode and reconstruct the audio signal
+  *          produced by ST MEMS microphone (MP45Dxxx, MP34Dxxx).
+  *          For more details about this Library, please refer to document
+  *          "PDM audio software decoding on STM32 microcontrollers (AN3998)".  
+ ******************************************************************************
+  * @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 __PDM_FILTER_H
+#define __PDM_FILTER_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* Includes ------------------------------------------------------------------*/
+#include <stdint.h>
+
+
+/* Exported types ------------------------------------------------------------*/
+typedef struct {
+  uint16_t Fs;
+  float LP_HZ;
+  float HP_HZ;
+  uint16_t In_MicChannels;
+  uint16_t Out_MicChannels;
+  char InternalFilter[34];
+} PDMFilter_InitStruct;
+
+/* Exported constants --------------------------------------------------------*/
+/* Exported macros -----------------------------------------------------------*/
+#define HTONS(A)  ((((uint16_t)(A) & 0xff00) >> 8) | \
+                   (((uint16_t)(A) & 0x00ff) << 8))
+
+/* Exported functions ------------------------------------------------------- */
+void PDM_Filter_Init(PDMFilter_InitStruct * Filter);
+
+int32_t PDM_Filter_64_MSB(uint8_t* data, uint16_t* dataOut, uint16_t MicGain, PDMFilter_InitStruct * Filter);
+int32_t PDM_Filter_80_MSB(uint8_t* data, uint16_t* dataOut, uint16_t MicGain, PDMFilter_InitStruct * Filter);
+int32_t PDM_Filter_128_MSB(uint8_t* data, uint16_t* dataOut, uint16_t MicGain, PDMFilter_InitStruct * Filter);
+int32_t PDM_Filter_64_LSB(uint8_t* data, uint16_t* dataOut, uint16_t MicGain, PDMFilter_InitStruct * Filter);
+int32_t PDM_Filter_80_LSB(uint8_t* data, uint16_t* dataOut, uint16_t MicGain, PDMFilter_InitStruct * Filter);
+int32_t PDM_Filter_128_LSB(uint8_t* data, uint16_t* dataOut, uint16_t MicGain, PDMFilter_InitStruct * Filter);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __PDM_FILTER_H */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
+
+