83 lines
3.0 KiB
C
83 lines
3.0 KiB
C
/******************************************************************************
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* The MIT License
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*
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* Copyright (c) 2010 Michael Hope.
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* Copyright (c) 2012 LeafLabs, LLC.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*****************************************************************************/
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/**
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* @file libmaple/dma.c
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* @author Marti Bolivar <mbolivar@leaflabs.com>;
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* Original implementation by Michael Hope
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* @brief Portable DMA routines.
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*/
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#include <libmaple/dma.h>
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#include "dma_private.h"
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#include "stm32_private.h"
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/*
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* Convenience routines
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*/
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/**
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* @brief Initialize a DMA device.
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* @param dev Device to initialize.
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*/
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void dma_init(dma_dev *dev) {
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rcc_clk_enable(dev->clk_id);
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}
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/*
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* Private API
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*/
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enum dma_atype _dma_addr_type(__io void *addr) {
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switch (stm32_block_purpose((void*)addr)) {
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/* Notice we're treating the code block as memory here. That's
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* correct for addresses in Flash and in [0x0, 0x7FFFFFF]
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* (provided that those addresses are aliased to Flash, SRAM, or
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* FSMC, depending on BOOT[01] and possibly SYSCFG_MEMRMP). It's
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* not correct for other addresses in the code block, but those
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* will (hopefully) just fail-fast with transfer or bus errors. If
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* lots of people get confused, it might be worth being more
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* careful here. */
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case STM32_BLOCK_CODE: /* Fall through */
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case STM32_BLOCK_SRAM: /* ... */
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case STM32_BLOCK_FSMC_1_2: /* ... */
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case STM32_BLOCK_FSMC_3_4:
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return DMA_ATYPE_MEM;
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case STM32_BLOCK_PERIPH:
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return DMA_ATYPE_PER;
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case STM32_BLOCK_FSMC_REG: /* Fall through */
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/* Is this right? I can't think of a reason to DMA into or out
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* of the FSMC registers. [mbolivar] */
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case STM32_BLOCK_UNUSED: /* ... */
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case STM32_BLOCK_CORTEX_INTERNAL: /* ... */
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return DMA_ATYPE_OTHER;
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default:
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ASSERT(0); /* Can't happen */
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return DMA_ATYPE_OTHER;
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}
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}
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