src/main/drivers/dma_common.c

   1 /*
   2  * This file is part of Cleanflight and Betaflight.
   3  *
   4  * Cleanflight and Betaflight are free software. You can redistribute
   5  * this software and/or modify this software under the terms of the
   6  * GNU General Public License as published by the Free Software
   7  * Foundation, either version 3 of the License, or (at your option)
   8  * any later version.
   9  *
  10  * Cleanflight and Betaflight are distributed in the hope that they
  11  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  12  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  13  * See the GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this software.
  17  *
  18  * If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "platform.h"
  22
  23 #ifdef USE_DMA
  24
  25 #include "drivers/dma_impl.h"
  26
  27 #include "dma.h"
  28
  29 dmaIdentifier_e dmaAllocate(dmaIdentifier_e identifier, resourceOwner_e owner, uint8_t resourceIndex)
  30 {
  31     if (dmaGetOwner(identifier)->owner != OWNER_FREE) {
  32         return DMA_NONE;
  33     }
  34
  35     const int index = DMA_IDENTIFIER_TO_INDEX(identifier);
  36     dmaDescriptors[index].owner.owner = owner;
  37     dmaDescriptors[index].owner.resourceIndex = resourceIndex;
  38
  39     return identifier;
  40 }
  41
  42 const resourceOwner_t *dmaGetOwner(dmaIdentifier_e identifier)
  43 {
  44     return &dmaDescriptors[DMA_IDENTIFIER_TO_INDEX(identifier)].owner;
  45 }
  46
  47 dmaIdentifier_e dmaGetIdentifier(const dmaResource_t* channel)
  48 {
  49     for (int i = 0; i < DMA_LAST_HANDLER; i++) {
  50         if (dmaDescriptors[i].ref == channel) {
  51             return i + 1;
  52         }
  53     }
  54
  55     return 0;
  56 }
  57
  58 dmaChannelDescriptor_t* dmaGetDescriptorByIdentifier(const dmaIdentifier_e identifier)
  59 {
  60     return &dmaDescriptors[DMA_IDENTIFIER_TO_INDEX(identifier)];
  61 }
  62
  63 uint32_t dmaGetChannel(const uint8_t channel)
  64 {
  65     return ((uint32_t)channel*2)<<24;
  66 }
  67 #endif