145 lines
5.3 KiB
C
145 lines
5.3 KiB
C
/****************************************************************************
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* arch/arm/src/samd/sam_sercom.h
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* 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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****************************************************************************/
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#ifndef __ARCH_ARM_SRC_SAMD_SAM_SERCOM_H
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#define __ARCH_ARM_SRC_SAMD_SAM_SERCOM_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdbool.h>
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#include "up_arch.h"
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#include "sam_config.h"
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#include "chip/sam_pm.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifndef __ASSEMBLY__
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#undef EXTERN
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#if defined(__cplusplus)
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: sercom_enable
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*
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* Description:
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* Enable clocking to a SERCOM module in PM
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*
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* Assumptions/Limitation:
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* This operation is global and non-atomic. The caller should disable
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* interrupts prior to calling this function.
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*
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****************************************************************************/
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static inline void sercom_enable(int sercom)
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{
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uint32_t regval;
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/* Enable clocking to the SERCOM module in PM */
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regval = getreg32(SAM_PM_APBCMASK);
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regval |= PM_APBCMASK_SERCOM(sercom);
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putreg32(regval, SAM_PM_APBCMASK);
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}
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: sercom_coreclk_configure
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*
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* Description:
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* Configure the SERCOM core source clock.
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*
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* Two generic clocks are used by the SERCOM: GCLK_SERCOMx_CORE and
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* GCLK_SERCOMx_SLOW. The core clock (GCLK_SERCOMx_CORE) is required to
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* clock the SERCOM while operating as a master, while the slow clock
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* (GCLK_SERCOM_SLOW) is only required for certain functions. SERCOM
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* modules must share the same slow GCLK channel ID.
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*
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* The baud-rate generator runs off the GCLK_SERCOMx_CORE clock (or,
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* optionally, external clock).
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*
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****************************************************************************/
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void sercom_coreclk_configure(int sercom, int gclkgen, bool wrlock);
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/****************************************************************************
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* Name: sercom_slowclk_configure
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*
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* Description:
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* Configure the SERCOM slow source clock.
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*
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* Two generic clocks are used by the SERCOM: GCLK_SERCOMx_CORE and
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* GCLK_SERCOMx_SLOW. The core clock (GCLK_SERCOMx_CORE) is required to
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* clock the SERCOM while operating as a master, while the slow clock
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* (GCLK_SERCOM_SLOW) is only required for certain functions. SERCOM
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* modules must share the same slow GCLK channel ID.
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*
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****************************************************************************/
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void sercom_slowclk_configure(int gclkgen);
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* __ARCH_ARM_SRC_SAMD_SAM_SERCOM_H */
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