47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
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/** @addtogroup dma_file DMA peripheral API
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@ingroup peripheral_apis
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LGPL License Terms @ref lgpl_license
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*/
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2019 Guillaume Revaillot <g.revaillot@gmail.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**@{*/
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#include <libopencm3/stm32/dma.h>
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/*---------------------------------------------------------------------------*/
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/** @brief DMA Channel Set Request Selection
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Set DMA request mapping selection for given channel. Refer to datasheet for channel
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request mapping tables.
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@param[in] dma DMA controller base address: DMA1 or DMA2
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@param[in] channel Channel number: 1-7 for DMA1 or 1-5 for DMA2
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@param[in] request DMA request mapping.
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*/
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void dma_set_channel_request(uint32_t dma, uint8_t channel, uint8_t request)
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{
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uint32_t reg32 = DMA_CSELR(dma) & ~(DMA_CSELR_CxS_MASK << DMA_CSELR_CxS_SHIFT(channel));
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DMA_CSELR(dma) = reg32 | ((DMA_CSELR_CxS_MASK & request) << DMA_CSELR_CxS_SHIFT(channel));
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}
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/**@}*/
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