159 lines
5.1 KiB
C
159 lines
5.1 KiB
C
//*****************************************************************************
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//
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// am_hal_pdm.c
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//! @file
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//!
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//! @brief Functions for interfacing with Pulse Density Modulation (PDM).
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//!
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//! @addtogroup pdm2 DMEMS Microphon3 (PDM)
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//! @ingroup apollo2hal
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//! @{
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//
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//*****************************************************************************
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//*****************************************************************************
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//
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// Copyright (c) 2017, Ambiq Micro
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its
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// contributors may be used to endorse or promote products derived from this
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// software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// This is part of revision 1.2.11 of the AmbiqSuite Development Package.
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//
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//*****************************************************************************
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#include <stdint.h>
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#include <stdbool.h>
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#include "am_mcu_apollo.h"
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//*****************************************************************************
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//
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//! @brief Configure the PDM module.
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//!
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//! This function reads the an \e am_hal_pdm_config_t structure and uses it to
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//! set up the PDM module.
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//!
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//! Please see the information on the am_hal_pdm_config_t configuration
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//! structure, found in am_hal_pdm.h, for more information on the parameters
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//! that may be set by this function.
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//!
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//! @return None.
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//
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//*****************************************************************************
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void
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am_hal_pdm_config(am_hal_pdm_config_t *psConfig)
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{
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//
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// setup the PDM PCFG register
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//
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AM_REG(PDM, PCFG) = psConfig->ui32PDMConfigReg;
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//
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// setup the PDM VCFG register
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//
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AM_REG(PDM, VCFG) = psConfig->ui32VoiceConfigReg;
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//
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// setup the PDM FIFO Threshold register
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//
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AM_REG(PDM, FTHR) = psConfig->ui32FIFOThreshold;
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//
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// Flush the FIFO for good measure.
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//
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am_hal_pdm_fifo_flush();
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}
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//*****************************************************************************
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//
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//! @brief Enable the PDM module.
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//!
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//! This function enables the PDM module in the mode previously defined by
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//! am_hal_pdm_config().
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//!
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//! @return None.
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//
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//*****************************************************************************
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void
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am_hal_pdm_enable(void)
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{
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AM_REG(PDM, PCFG) |= AM_REG_PDM_PCFG_PDMCORE_EN;
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AM_REG(PDM, VCFG) |= ( AM_REG_PDM_VCFG_IOCLKEN_EN |
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AM_REG_PDM_VCFG_PDMCLK_EN |
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AM_REG_PDM_VCFG_RSTB_NORM );
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}
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//*****************************************************************************
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//
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//! @brief Disable the PDM module.
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//!
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//! This function disables the PDM module.
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//!
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//! @return None.
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//
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//*****************************************************************************
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void
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am_hal_pdm_disable(void)
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{
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AM_REG(PDM, PCFG) &= ~ AM_REG_PDM_PCFG_PDMCORE_EN;
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AM_REG(PDM, VCFG) &= ~ ( AM_REG_PDM_VCFG_IOCLKEN_EN |
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AM_REG_PDM_VCFG_PDMCLK_EN |
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AM_REG_PDM_VCFG_RSTB_NORM );
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}
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//*****************************************************************************
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//
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//! @brief Return the PDM Interrupt status.
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//!
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//! @param bEnabledOnly - return only the enabled interrupts.
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//!
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//! Use this function to get the PDM interrupt status.
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//!
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//! @return intrrupt status
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//
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//*****************************************************************************
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uint32_t
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am_hal_pdm_int_status_get(bool bEnabledOnly)
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{
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if ( bEnabledOnly )
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{
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uint32_t u32RetVal = AM_REG(PDM, INTSTAT);
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return u32RetVal & AM_REG(PDM, INTEN);
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}
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else
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{
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return AM_REG(PDM, INTSTAT);
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}
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}
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//*****************************************************************************
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//
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// End the doxygen group
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//! @}
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//
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//*****************************************************************************
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