/**************************************************************************** * arch/arm/src/lpc17xx/lpc17_gpdma.h * * Copyright (C) 2010, 2013 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ #ifndef __ARCH_ARM_SRC_LPC17XX_LPC17_GPDMA_H #define __ARCH_ARM_SRC_LPC17XX_LPC17_GPDMA_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include "hardware/lpc17_gpdma.h" /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /**************************************************************************** * Public Types ****************************************************************************/ #ifdef CONFIG_LPC17_GPDMA /* DMA_HANDLE is an opaque reference to an allocated DMA channel */ typedef FAR void *DMA_HANDLE; /* dma_callback_t a function pointer provided to lpc17_dmastart. This * function is called at the completion of the DMA transfer. 'arg' is the * same 'arg' value that was provided when lpc17_dmastart() was called and * result indicates the result of the transfer: Zero indicates a successful * transfers. On failure, a negated errno is returned indicating the general * nature of the DMA faiure. */ typedef void (*dma_callback_t)(DMA_HANDLE handle, void *arg, int result); /* The following is used for sampling DMA registers when CONFIG DEBUG_DMA is selected */ #ifdef CONFIG__DEBUG_DMA_INFO struct lpc17_dmaglobalregs_s { /* Global Registers */ uint32_t intst; /* DMA Interrupt Status Register */ uint32_t inttcst; /* DMA Interrupt Terminal Count Request Status Register */ uint32_t interrst; /* DMA Interrupt Error Status Register */ uint32_t rawinttcst; /* DMA Raw Interrupt Terminal Count Status Register */ uint32_t rawinterrst; /* DMA Raw Error Interrupt Status Register */ uint32_t enbldchns; /* DMA Enabled Channel Register */ uint32_t softbreq; /* DMA Software Burst Request Register */ uint32_t softsreq; /* DMA Software Single Request Register */ uint32_t softlbreq; /* DMA Software Last Burst Request Register */ uint32_t softlsreq; /* DMA Software Last Single Request Register */ uint32_t config; /* DMA Configuration Register */ uint32_t sync; /* DMA Synchronization Register */ }; struct lpc17_dmachanregs_s { /* Channel Registers */ uint32_t srcaddr; /* DMA Channel Source Address Register */ uint32_t destaddr; /* DMA Channel Destination Address Register */ uint32_t lli; /* DMA Channel Linked List Item Register */ uint32_t control; /* DMA Channel Control Register */ uint32_t config; /* DMA Channel Configuration Register */ }; struct lpc17_dmaregs_s { /* Global Registers */ struct lpc17_dmaglobalregs_s gbl; /* Channel Registers */ struct lpc17_dmachanregs_s ch; }; #endif /* CONFIG__DEBUG_DMA_INFO */ /**************************************************************************** * Public Data ****************************************************************************/ #ifndef __ASSEMBLY__ #undef EXTERN #if defined(__cplusplus) #define EXTERN extern "C" extern "C" { #else #define EXTERN extern #endif /* If the following value is zero, then there is no DMA in progress. This * value is needed in the IDLE loop to determine if the IDLE loop should * go into lower power power consumption modes. According to the LPC17xx * User Manual: "The DMA controller can continue to work in Sleep mode, and * has access to the peripheral SRAMs and all peripheral registers. The * flash memory and the Main SRAM are not available in Sleep mode, they are * disabled in order to save power." */ EXTERN volatile uint8_t g_dma_inprogress; /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: lpc17_dmaconfigure * * Description: * Configure a DMA request. Each DMA request may have two different DMA * request sources. This associates one of the sources with a DMA request. * * Returned Value: * None * ****************************************************************************/ void lpc17_dmaconfigure(uint8_t dmarequest, bool alternate); /**************************************************************************** * Name: lpc17_dmachannel * * Description: * Allocate a DMA channel. This function sets aside a DMA channel and * gives the caller exclusive access to the DMA channel. * * Returned Value: * One success, this function returns a non-NULL, void* DMA channel * handle. NULL is returned on any failure. This function can fail only * if no DMA channel is available. * ****************************************************************************/ DMA_HANDLE lpc17_dmachannel(void); /**************************************************************************** * Name: lpc17_dmafree * * Description: * Release a DMA channel. NOTE: The 'handle' used in this argument must * NEVER be used again until lpc17_dmachannel() is called again to re-gain * a valid handle. * * Returned Value: * None * ****************************************************************************/ void lpc17_dmafree(DMA_HANDLE handle); /**************************************************************************** * Name: lpc17_dmasetup * * Description: * Configure DMA for one transfer. * ****************************************************************************/ int lpc17_dmasetup(DMA_HANDLE handle, uint32_t control, uint32_t config, uint32_t srcaddr, uint32_t destaddr, size_t nxfrs); /**************************************************************************** * Name: lpc17_dmastart * * Description: * Start the DMA transfer * ****************************************************************************/ int lpc17_dmastart(DMA_HANDLE handle, dma_callback_t callback, void *arg); /**************************************************************************** * Name: lpc17_dmastop * * Description: * Cancel the DMA. After lpc17_dmastop() is called, the DMA channel is * reset and lpc17_dmasetup() must be called before lpc17_dmastart() can be * called again * ****************************************************************************/ void lpc17_dmastop(DMA_HANDLE handle); /**************************************************************************** * Name: lpc17_dmasample * * Description: * Sample DMA register contents * ****************************************************************************/ #ifdef CONFIG__DEBUG_DMA_INFO void lpc17_dmasample(DMA_HANDLE handle, struct lpc17_dmaregs_s *regs); #else # define lpc17_dmasample(handle,regs) #endif /**************************************************************************** * Name: lpc17_dmadump * * Description: * Dump previously sampled DMA register contents * ****************************************************************************/ #ifdef CONFIG__DEBUG_DMA_INFO void lpc17_dmadump(DMA_HANDLE handle, const struct lpc17_dmaregs_s *regs, const char *msg); #else # define lpc17_dmadump(handle,regs,msg) #endif #undef EXTERN #ifdef __cplusplus } #endif #endif /* __ASSEMBLY__ */ #endif /* CONFIG_LPC17_GPDMA */ #endif /* __ARCH_ARM_SRC_LPC17XX_LPC17_GPDMA_H */