src/main/drivers/dma_stm32f4xx.c

   1 /*
   2  * This file is part of Cleanflight.
   3  *
   4  * Cleanflight is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * Cleanflight is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with Cleanflight.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <stdbool.h>
  19 #include <stdint.h>
  20 #include <string.h>
  21
  22 #include <platform.h>
  23
  24 #include "build/debug.h"
  25 #include "common/utils.h"
  26 #include "drivers/nvic.h"
  27 #include "drivers/dma.h"
  28 #include "drivers/rcc.h"
  29
  30 /*
  31  * DMA descriptors.
  32  */
  33 static dmaChannelDescriptor_t dmaDescriptors[] = {
  34     [0]  = DEFINE_DMA_CHANNEL(1, 0, 0),     // DMA1_ST0
  35     [1]  = DEFINE_DMA_CHANNEL(1, 1, 6),     // DMA1_ST1
  36     [2]  = DEFINE_DMA_CHANNEL(1, 2, 16),    // DMA1_ST2
  37     [3]  = DEFINE_DMA_CHANNEL(1, 3, 22),    // DMA1_ST3
  38     [4]  = DEFINE_DMA_CHANNEL(1, 4, 32),    // DMA1_ST4
  39     [5]  = DEFINE_DMA_CHANNEL(1, 5, 38),    // DMA1_ST5
  40     [6]  = DEFINE_DMA_CHANNEL(1, 6, 48),    // DMA1_ST6
  41     [7]  = DEFINE_DMA_CHANNEL(1, 7, 54),    // DMA1_ST7
  42
  43     [8]  = DEFINE_DMA_CHANNEL(2, 0, 0),     // DMA2_ST0
  44     [9]  = DEFINE_DMA_CHANNEL(2, 1, 6),     // DMA2_ST1
  45     [10] = DEFINE_DMA_CHANNEL(2, 2, 16),    // DMA2_ST2
  46     [11] = DEFINE_DMA_CHANNEL(2, 3, 22),    // DMA2_ST3
  47     [12] = DEFINE_DMA_CHANNEL(2, 4, 32),    // DMA2_ST4
  48     [13] = DEFINE_DMA_CHANNEL(2, 5, 38),    // DMA2_ST5
  49     [14] = DEFINE_DMA_CHANNEL(2, 6, 48),    // DMA2_ST6
  50     [15] = DEFINE_DMA_CHANNEL(2, 7, 54)     // DMA2_ST7
  51 };
  52
  53 /*
  54  * DMA IRQ Handlers
  55  */
  56 DEFINE_DMA_IRQ_HANDLER(1, 0, 0)     // DMA1_ST0 = dmaDescriptors[0]
  57 DEFINE_DMA_IRQ_HANDLER(1, 1, 1)
  58 DEFINE_DMA_IRQ_HANDLER(1, 2, 2)
  59 DEFINE_DMA_IRQ_HANDLER(1, 3, 3)
  60 DEFINE_DMA_IRQ_HANDLER(1, 4, 4)
  61 DEFINE_DMA_IRQ_HANDLER(1, 5, 5)
  62 DEFINE_DMA_IRQ_HANDLER(1, 6, 6)
  63 DEFINE_DMA_IRQ_HANDLER(1, 7, 7)
  64 DEFINE_DMA_IRQ_HANDLER(2, 0, 8)
  65 DEFINE_DMA_IRQ_HANDLER(2, 1, 9)
  66 DEFINE_DMA_IRQ_HANDLER(2, 2, 10)
  67 DEFINE_DMA_IRQ_HANDLER(2, 3, 11)
  68 DEFINE_DMA_IRQ_HANDLER(2, 4, 12)
  69 DEFINE_DMA_IRQ_HANDLER(2, 5, 13)
  70 DEFINE_DMA_IRQ_HANDLER(2, 6, 14)
  71 DEFINE_DMA_IRQ_HANDLER(2, 7, 15)
  72
  73 DMA_t dmaGetByTag(dmaTag_t tag)
  74 {
  75     for (unsigned i = 0; i < ARRAYLEN(dmaDescriptors); i++) {
  76         // On F4/F7 we match only DMA and Stream. Channel is needed when connecting DMA to peripheral
  77         if (DMATAG_GET_DMA(dmaDescriptors[i].tag) == DMATAG_GET_DMA(tag) && DMATAG_GET_STREAM(dmaDescriptors[i].tag) == DMATAG_GET_STREAM(tag)) {
  78             return (DMA_t)&dmaDescriptors[i];
  79         }
  80     }
  81
  82     return (DMA_t) NULL;
  83 }
  84
  85 void dmaEnableClock(DMA_t dma)
  86 {
  87     if (dma->dma == DMA1) {
  88         RCC_ClockCmd(RCC_AHB1(DMA1), ENABLE);
  89     }
  90     else {
  91         RCC_ClockCmd(RCC_AHB1(DMA2), ENABLE);
  92     }
  93 }
  94
  95 resourceOwner_e dmaGetOwner(DMA_t dma)
  96 {
  97     return dma->owner;
  98 }
  99
 100 void dmaInit(DMA_t dma, resourceOwner_e owner, uint8_t resourceIndex)
 101 {
 102     dmaEnableClock(dma);
 103     dma->owner = owner;
 104     dma->resourceIndex = resourceIndex;
 105 }
 106
 107 void dmaSetHandler(DMA_t dma, dmaCallbackHandlerFuncPtr callback, uint32_t priority, uint32_t userParam)
 108 {
 109     dmaEnableClock(dma);
 110
 111     dma->irqHandlerCallback = callback;
 112     dma->userParam = userParam;
 113
 114     NVIC_SetPriority(dma->irqNumber, priority);
 115     NVIC_EnableIRQ(dma->irqNumber);
 116 }
 117
 118 uint32_t dmaGetChannelByTag(dmaTag_t tag)
 119 {
 120     static const uint32_t dmaChannel[8] = { DMA_Channel_0, DMA_Channel_1, DMA_Channel_2, DMA_Channel_3, DMA_Channel_4, DMA_Channel_5, DMA_Channel_6, DMA_Channel_7 };
 121     return dmaChannel[DMATAG_GET_CHANNEL(tag)];
 122 }
 123
 124 DMA_t dmaGetByRef(const DMA_Stream_TypeDef* ref)
 125 {
 126     for (unsigned i = 0; i < ARRAYLEN(dmaDescriptors); i++) {
 127         if (ref == dmaDescriptors[i].ref) {
 128             return &dmaDescriptors[i];
 129         }
 130     }
 131
 132     return NULL;
 133 }