222 lines
9.1 KiB
C
222 lines
9.1 KiB
C
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/*
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* @brief DMA controller ROM API declarations and functions
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*
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* @note
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* Copyright(C) NXP Semiconductors, 2014
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* All rights reserved.
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*
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* @par
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* Software that is described herein is for illustrative purposes only
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* which provides customers with programming information regarding the
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* LPC products. This software is supplied "AS IS" without any warranties of
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* any kind, and NXP Semiconductors and its licensor disclaim any and
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* all warranties, express or implied, including all implied warranties of
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* merchantability, fitness for a particular purpose and non-infringement of
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* intellectual property rights. NXP Semiconductors assumes no responsibility
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* or liability for the use of the software, conveys no license or rights under any
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* patent, copyright, mask work right, or any other intellectual property rights in
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* or to any products. NXP Semiconductors reserves the right to make changes
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* in the software without notification. NXP Semiconductors also makes no
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* representation or warranty that such application will be suitable for the
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* specified use without further testing or modification.
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*
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* @par
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, under NXP Semiconductors' and its
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* licensor's relevant copyrights in the software, without fee, provided that it
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* is used in conjunction with NXP Semiconductors microcontrollers. This
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* copyright, permission, and disclaimer notice must appear in all copies of
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* this code.
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*/
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#ifndef __ROMAPI_DMA_H_
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#define __ROMAPI_DMA_H_
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#include "hw_dmaaltd.h"
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/** @defgroup ROMAPI_DMA_WRAPPER CHIP: DMA controller ROM wrapper functions
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* @ingroup ROMAPI_5410X
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* @{
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*/
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/** @brief Minimum byte alignment value needed for the channel table.
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* Use 4 for 4 byte alginment, 8 for 8 byte alignment, etc. */
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#define MINDMATABLEALIGN 512
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/** @brief Number of DMA channels the DMA controller supports. */
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#define NUMDMACHANNELS 22
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/**
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* @brief Get memory size in bytes needed for DMA controller driver context
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* @return Size in bytes needed for the ROM driver
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*/
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uint32_t ROM_DMA_GetMemSize(void);
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/**
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* @brief Initialize DMA controller
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* @param mem : Pointer to memory area used to driver context
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* @param pInit : Pointer to DMA controller init data
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* @return NULL on error, or a pointer to the device context handle
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*/
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ROM_DMA_HANDLE_T ROM_DMA_Init(void *mem, ROM_DMA_INIT_T *pInit);
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/**
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* @brief Configures a DMA channel
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* @param pHandle : Pointer to driver context handle
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* @param pCfg : Pointer to DMA channel configuration structure
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* @param dmaCh : DMA channel to configure
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* @return LPC_OK if no errors occured, or an error code
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*/
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ErrorCode_t ROM_DMA_SetupChannel(ROM_DMA_HANDLE_T pHandle, ROM_DMA_CHAN_CFG_T *pCfg, uint8_t dmaCh);
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/**
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* @brief Initialzies a transfer descriptor queue for a channel
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* @param pHandle : Pointer to driver context handle
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* @param dmaCh : DMA channel to configure
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* @param pQueue : Pointer to a queue to initialize
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* @return LPC_OK if no errors occured, or an error code
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*/
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ErrorCode_t ROM_DMA_InitQueue(ROM_DMA_HANDLE_T pHandle, uint8_t dmaCh, ROM_DMA_QUEUE_T *pQueue);
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/**
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* @brief Registers an DMA controller callback for a queue
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* @param pHandle : Pointer to driver context handle
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* @param pQueue : Pointer to a queue
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* @param cbIndex : Callback to register
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* @param pCB : Pointer to callback function
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* @return Nothing
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*/
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void ROM_DMA_RegisterQueueCallback(ROM_DMA_HANDLE_T pHandle, ROM_DMA_QUEUE_T *pQueue, uint32_t cbIndex, void *pCB);
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/**
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* @brief Builds a transfer descriptor chain from the passed settings
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* @param pHandle : Pointer to driver context handle
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* @param pXferCfg : Pointer to the transfer configuration
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* @param pDesc : Pointer to a descriptor to setup
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* @param pDescPrev : Pointer to previous descriptor that will link to this one
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* @return LPC_OK if no errors occured, or an error code
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* @note When creating a DMA descriptor chain (more than 1 link), chain the descriptors
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* together by passing the previous descriptor pointers for subsequenct calls to this function.
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*/
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ErrorCode_t ROM_DMA_BuildDescriptorChain(ROM_DMA_HANDLE_T pHandle,
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ROM_DMA_XFERDESC_CFG_T *pXferCfg,
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ROM_DMA_DESC_T *pDesc,
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ROM_DMA_DESC_T *pDescPrev);
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/**
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* @brief Returns the number of items transferred on the last descriptor chain (spent status only)
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* @param pHandle : Pointer to driver context handle
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* @param pDesc : Pointer to a descriptor chain to count
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* @return LPC_OK if no errors occured, or an error code
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*/
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uint32_t ROM_DMA_GetTransferCount(ROM_DMA_HANDLE_T pHandle, ROM_DMA_DESC_T *pDesc);
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/**
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* @brief Unstalls a descriptor chain that has been setup using the stallDesc option
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* @param pHandle : Pointer to driver context handle
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* @param pQueue : Pointer to a descriptor chain to unstall
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* @return Nothing
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* @note If a descriptor in a chain is setup with the stallDesc!=0 option in the
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* @ref ROM_DMA_XFERDESC_CFG_T setup structure, the descriptor will stall when it
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* is loaded. A stalled descriptor is ready to be processed, but won't start until a
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* call to this fucntion is made.
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*/
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void ROM_DMA_UnstallDescriptorChain(ROM_DMA_HANDLE_T pHandle, ROM_DMA_QUEUE_T *pQueue);
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/**
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* @brief Queues a transfer descriptor chain
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* @param pHandle : Pointer to driver context handle
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* @param pQueue : Pointer to a queue
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* @param pDescChainHead : Pointer to the start of a descriptor chain to queue
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* @return Nothing
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*/
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void ROM_DMA_QueueDescriptor(ROM_DMA_HANDLE_T pHandle, ROM_DMA_QUEUE_T *pQueue, ROM_DMA_DESC_T *pDescChainHead);
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/**
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* @brief Returns current status of next descriptor to be popped from the queue
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* @param pHandle : Pointer to driver context handle
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* @param pQueue : Pointer to a queue
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* @return Pointer to next pop descriptor, or ROM_DMA_DESC_STS_INVALID if no descriptors exist to be popped
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* @note Only descriptors that are spent, aborted, or have an error can be popped. Calling ROM_DMA_StopQueue()
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* will abort the current descriptor in progress. This function returns the next descriptor that can be popped
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* regardless of status without actually popping it.
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*/
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ROM_DMA_DESC_STS_T ROM_DMA_GetQueuePopDescriptorStatus(ROM_DMA_HANDLE_T pHandle, ROM_DMA_QUEUE_T *pQueue);
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/**
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* @brief Pops (unqueues) an expired transfer descriptor from the queue - expired descriptors are in spent, error, or abort states
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* @param pHandle : Pointer to driver context handle
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* @param pQueue : Pointer to a queue
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* @return Pointer to popped descriptor, or NULL if no descriptors exist to be popped
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* @note Only descriptors that are spent, aborted, or have an error can be popped. Calling ROM_DMA_StopQueue()
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* will abort the current descriptor in progress.
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*/
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ROM_DMA_DESC_T *ROM_DMA_UnQueueDescriptor(ROM_DMA_HANDLE_T pHandle, ROM_DMA_QUEUE_T *pQueue);
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/**
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* @brief Starts or restarts a queue at the next descriptor chain
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* @param pHandle : Pointer to driver context handle
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* @param pQueue : Pointer to a queue
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* @return LPC_OK if the queue is started or currently started, or an error code
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*/
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ErrorCode_t ROM_DMA_StartQueue(ROM_DMA_HANDLE_T pHandle, ROM_DMA_QUEUE_T *pQueue);
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/**
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* @brief Stops DMA and aborts current descriptor chain being processed in queue
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* @param pHandle : Pointer to driver context handle
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* @param pQueue : Pointer to a queue
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* @return LPC_OK if the queue is stopped or already stopped, or an error code
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* @note If multiple descriptor chains are queued up, this aborts the current one
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* being processed in queueing, ready, or busy states. All descriptors after the aborted
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* descriptor remain ready.
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*/
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ErrorCode_t ROM_DMA_StopQueue(ROM_DMA_HANDLE_T pHandle, ROM_DMA_QUEUE_T *pQueue);
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/**
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* @brief Stops DMA and completely flushes a transfer queue, queue is completely reset
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* @param pHandle : Pointer to driver context handle
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* @param pQueue : Pointer to a queue
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* @return Nothing
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* @note Flushes the entire queue of all descriptors and stops DMA.
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*/
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void ROM_DMA_FlushQueue(ROM_DMA_HANDLE_T pHandle, ROM_DMA_QUEUE_T *pQueue);
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/**
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* @brief Returns the current queue state (ROM_DMA_QUEUE_STATES_T)
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* @param pHandle : Pointer to driver context handle
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* @param pQueue : Pointer to a queue
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* @return Current queue status (ROM_DMA_QUEUE_STATES_T)
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*/
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uint8_t ROM_DMA_GetQueueState(ROM_DMA_HANDLE_T pHandle, ROM_DMA_QUEUE_T *pQueue);
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/**
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* @brief Forces a DMA transfer to trigger
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* @param pHandle : Pointer to driver context handle
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* @param pQueue : Pointer to a queue
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* @return Nothing
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*/
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void ROM_DMA_ForceTrigger(ROM_DMA_HANDLE_T pHandle, ROM_DMA_QUEUE_T *pQueue);
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/**
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* @brief DMA controller (interrupt) handler
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* @param pHandle : Pointer to driver context handle
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* @return Nothing
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* @note This function should be called from the DMA interrupt handler.
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*/
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void ROM_DMA_DMAHandler(ROM_DMA_HANDLE_T pHandle);
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/**
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* @brief Return the DMA controller ROM driver version
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* @return Driver version number
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* @note The returned driver version number consists of a major and minor
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* number, with the minor number in the lower 8 bits and the major number in
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* the upper 8 bits.
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*/
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uint16_t ROM_DMA_GetDriverVersion(void);
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/**
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* @}
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*/
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#endif /* __ROMAPI_DMA_H_ */
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