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