source: rtems/bsps/arm/lpc176x/include/bsp/dma.h @ c991eeec

/**
 * @file
 *
 * @ingroup RTEMSBSPsARMLPC176X_dma
 *
 * @brief Direct memory access (DMA) support.
 */

/*
 * Copyright (c) 2008, 2009
 * embedded brains GmbH
 * Obere Lagerstr. 30
 * D-82178 Puchheim
 * Germany
 * <rtems@embedded-brains.de>
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://www.rtems.org/license/LICENSE.
 */

#ifndef LIBBSP_ARM_LPC176X_DMA_H
#define LIBBSP_ARM_LPC176X_DMA_H

#include <rtems.h>

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

/**
 * @defgroup lpc176x_dma DMA Support
 *
 * @ingroup RTEMSBSPsARMLPC176X
 *
 * @brief Direct memory access (DMA) support.
 *
 * @{
 */

/**
 * @brief Initializes the general purpose DMA.
 */
void lpc176x_dma_initialize( void );

/**
 * @brief Tries to obtain the DMA channel @a channel.
 *
 * @retval RTEMS_SUCCESSFUL Successful operation.
 * @retval RTEMS_INVALID_ID Invalid channel number.
 * @retval RTEMS_RESOURCE_IN_USE Channel already occupied.
 */
rtems_status_code lpc176x_dma_channel_obtain( unsigned channel );

/**
 * @brief Releases the DMA channel @a channel.
 *
 * You must have obtained this channel with lpc176x_dma_channel_obtain()
 * previously.
 *
 * If the channel number @a channel is out of range nothing will happen.
 */
void lpc176x_dma_channel_release( unsigned channel );

/**
 * @brief Disables the DMA channel @a channel.
 *
 * If @a force is @c false the channel will be halted and disabled when the
 * channel is inactive otherwise it will be disabled immediately.
 *
 * If the channel number @a channel is out of range nothing will happen.
 */
void lpc176x_dma_channel_disable(
  unsigned channel,
  bool     force
);

rtems_status_code lpc176x_dma_copy_initialize( void );

rtems_status_code lpc176x_dma_copy_release( void );

rtems_status_code lpc176x_dma_copy(
  unsigned    channel,
  const void *dest,
  const void *src,
  size_t      n,
  size_t      width
);

rtems_status_code lpc176x_dma_copy_wait( unsigned channel );

/** @} */

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* LIBBSP_ARM_LPC176X_DMA_H */