106 lines
2.9 KiB
C
106 lines
2.9 KiB
C
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/*
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ChibiOS/RT - Copyright (C) 2013-2014 Uladzimir Pylinsky aka barthess
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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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,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include <string.h>
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#include "ch.h"
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#include "hal.h"
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#include "memcpy_dma.h"
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/*
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******************************************************************************
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* DEFINES
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******************************************************************************
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*/
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#define STM32_MEMCPY_DMA_PRIORITY 0
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#define STM32_MEMCPY_DMA_STREAM STM32_DMA_STREAM_ID(2, 6)
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/*
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******************************************************************************
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* EXTERNS
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******************************************************************************
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*/
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/*
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******************************************************************************
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* PROTOTYPES
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******************************************************************************
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*/
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/*
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******************************************************************************
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* GLOBAL VARIABLES
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******************************************************************************
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*/
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static memcpy_dma_engine_t engine;
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/*
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******************************************************************************
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******************************************************************************
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* LOCAL FUNCTIONS
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******************************************************************************
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******************************************************************************
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*/
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/*
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******************************************************************************
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* EXPORTED FUNCTIONS
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******************************************************************************
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*/
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/*
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*
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*/
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void memcpy_dma_start(void) {
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bool b;
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engine.dma = STM32_DMA_STREAM(STM32_MEMCPY_DMA_STREAM);
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b = dmaStreamAlloc(engine.dma, STM32_MEMCPY_DMA_PRIORITY, NULL, NULL);
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osalDbgAssert(!b, "stream already allocated");
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}
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/*
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*
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*/
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void memcpy_dma_stop(void) {
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dmaStreamFree(engine.dma);
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}
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/*
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*
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*/
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void memcpy_dma(void *dest, const void *src, size_t size) {
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size_t words = size / 4;
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size_t remainder = size % 4;
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size_t max_block = 0xFFFF; /* DMA limitation */
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uint32_t cr = STM32_DMA_CR_PSIZE_WORD | STM32_DMA_CR_MSIZE_WORD;
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while (words > max_block) {
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dmaStartMemCopy(engine.dma, cr, src, dest, max_block)
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dmaWaitCompletion(engine.dma);
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words -= max_block;
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}
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dmaStartMemCopy(engine.dma, cr, src, dest, words)
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dmaWaitCompletion(engine.dma);
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if (remainder > 0)
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memcpy(dest+size-remainder, src+size-remainder, remainder);
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}
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