155 lines
5.2 KiB
C
155 lines
5.2 KiB
C
/****************************************************************************
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* arch/arm/src/kinetis/kinetis_pindma.c
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*
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* Copyright (C) 201, 2013 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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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <arch/board/board.h>
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#include <nuttx/config.h>
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#include <nuttx/arch.h>
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#include "up_internal.h"
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#ifdef CONFIG_KINETIS_DMA
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/************************************************************************************
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* Name: kinetis_pindmaenable
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*
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* Description:
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* Enable DMA for specified pin
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*
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************************************************************************************/
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void kinetis_pindmaenable(uint32_t pinset)
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{
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uintptr_t base;
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uint32_t regval;
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unsigned int port;
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unsigned int pin;
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/* Get the port number and pin number */
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port = (pinset & _PIN_PORT_MASK) >> _PIN_PORT_SHIFT;
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pin = (pinset & _PIN_MASK) >> _PIN_SHIFT;
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DEBUGASSERT(port < KINETIS_NPORTS);
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if (port < KINETIS_NPORTS)
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{
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/* Get the base address of PORT block for this port */
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base = KINETIS_PORT_BASE(port);
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/* Modify the IRQC field of the port PCR register in order to enable DMA. */
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regval = getreg32(base + KINETIS_PORT_PCR_OFFSET(pin));
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regval &= ~PORT_PCR_IRQC_MASK;
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switch (pinset & _PIN_INT_MASK)
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{
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case PIN_DMA_RISING : /* DMA Request on rising edge */
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regval |= PORT_PCR_IRQC_DMARISING;
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break;
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case PIN_DMA_FALLING : /* DMA Request on falling edge */
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regval |= PORT_PCR_IRQC_DMAFALLING;
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break;
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case PIN_DMA_BOTH : /* DMA Request on either edge */
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regval |= PORT_PCR_IRQC_DMABOTH;
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break;
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default:
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return;
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}
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putreg32(regval, base + KINETIS_PORT_PCR_OFFSET(pin));
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}
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}
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/************************************************************************************
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* Name: kinetis_pindmadisable
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*
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* Description:
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* Disable DMA for specified pin
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*
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************************************************************************************/
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void kinetis_pindmadisable(uint32_t pinset)
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{
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uintptr_t base;
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uint32_t regval;
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unsigned int port;
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unsigned int pin;
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/* Get the port number and pin number */
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port = (pinset & _PIN_PORT_MASK) >> _PIN_PORT_SHIFT;
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pin = (pinset & _PIN_MASK) >> _PIN_SHIFT;
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DEBUGASSERT(port < KINETIS_NPORTS);
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if (port < KINETIS_NPORTS)
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{
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/* Get the base address of PORT block for this port */
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base = KINETIS_PORT_BASE(port);
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/* Clear the IRQC field of the port PCR register in order to disable DMA. */
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regval = getreg32(base + KINETIS_PORT_PCR_OFFSET(pin));
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regval &= ~PORT_PCR_IRQC_MASK;
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putreg32(regval, base + KINETIS_PORT_PCR_OFFSET(pin));
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}
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}
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#endif
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