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/**
* @file
*
* @ingroup RTEMSBSPsARMLPC24XX_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_LPC24XX_DMA_H
#define LIBBSP_ARM_LPC24XX_DMA_H
#include <rtems.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/**
* @defgroup lpc24xx_dma DMA Support
*
* @ingroup RTEMSBSPsARMLPC24XX
*
* @brief Direct memory access (DMA) support.
*
* @{
*/
/**
* @brief Initializes the general purpose DMA.
*/
void lpc24xx_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 lpc24xx_dma_channel_obtain(unsigned channel);
/**
* @brief Releases the DMA channel @a channel.
*
* You must have obtained this channel with lpc24xx_dma_channel_obtain()
* previously.
*
* If the channel number @a channel is out of range nothing will happen.
*/
void lpc24xx_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 lpc24xx_dma_channel_disable(unsigned channel, bool force);
rtems_status_code lpc24xx_dma_copy_initialize(void);
rtems_status_code lpc24xx_dma_copy_release(void);
rtems_status_code lpc24xx_dma_copy(
unsigned channel,
void *dest,
const void *src,
size_t n,
size_t width
);
rtems_status_code lpc24xx_dma_copy_wait(unsigned channel);
/** @} */
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* LIBBSP_ARM_LPC24XX_DMA_H */
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