154 lines
4.6 KiB
C
154 lines
4.6 KiB
C
/****************************************************************************
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* arch/arm/src/kinetis/kinetis_pindma.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <nuttx/config.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <arch/board/board.h>
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#include <nuttx/arch.h>
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#include <nuttx/arch.h>
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#include "arm_internal.h"
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#include "kinetis_config.h"
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#include "chip.h"
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#include "kinetis.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
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* enable DMA.
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*/
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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
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* DMA.
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*/
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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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