1 | void StartDMATransferToBuffer (uint16_t u16Titel)
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2 | {
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3 | /**
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4 | Test wie man Daten über die DMA Schnittstelle vom Mem an die SPI sendet
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5 | DMA SPI1 TX -> DMA1 CH3
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6 | kann nur 16 Bit sein wenn SPI auch 16 bit empfangen kann !!!
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7 | hoffentlich!
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8 | **/
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9 | DMA_InitTypeDef DMA_InitStructure;
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10 | uint8_t rw_workbyte[] = { 0x55 };
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11 | uint32_t u32Laufvar;
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12 |
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13 | float tCPU = 1.0/TIMFREQUENZ;
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14 | float tSampling = 1.0/get_SampleRate( u16Titel );
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15 |
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16 | fQuantisationTime = (uint16_t)(tSampling/tCPU);
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17 |
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18 | fSkalierungsfaktorXAchse = fQuantisationTime/(pow(2,get_BitsPerSample(u16Titel)));
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19 |
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20 | for(u32Laufvar = 0 ; u32Laufvar < (BUFFER_WIDE*2) ; u32Laufvar++)
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21 | {
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22 | u16MasterOutBuffer[u32Laufvar] = fQuantisationTime/2;
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23 | }
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24 |
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25 | //Alle Puffer gelten als leer
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26 | u8DoubleBufferCommunicationControl = 0;
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27 |
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28 | DMA_DeInit(DMA1_Channel3);
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29 |
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30 | RCC_Configuration_DMA();
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31 | RCC_Configuration_PWM();
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32 | NVIC_Configuration_DMA();
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33 |
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34 | u16BytesToTransferPerDMACycle = BUFFER_WIDE * get_BlockAlign(u16Titel);
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35 |
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36 | //Neue Adresse im Flash da immer ein Byte übersprungen wurde
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37 | u32JumpAdressDuringBufferChanging = get_AudioStartAdress(u16Titel);
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38 | PrepareFlashToRead(u32JumpAdressDuringBufferChanging);
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39 |
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40 | DMA_DeInit(DMA1_Channel3);
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41 |
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42 | DMA_Cmd(DMA1_Channel2, DISABLE);
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43 | DMA_Cmd(DMA1_Channel3, DISABLE);
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44 |
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45 | DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(SPI1->DR);
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46 | DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&rw_workbyte[0];
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47 | DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
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48 |
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49 | DMA_InitStructure.DMA_BufferSize = u16BytesToTransferPerDMACycle;//(uint32_t)(get_AudioEndAdress(u16Titel)-get_AudioStartAdress(u16Titel)); //<-wie viel
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50 | DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
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51 | DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
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52 | DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;//DMA_Mode_Circular;
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53 | DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
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54 | DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
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55 | DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
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56 | DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
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57 |
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58 |
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59 | //TX Chanel um Clock zu erzwingen
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60 | DMA_Init(DMA1_Channel3, &DMA_InitStructure);
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61 | //---------------------------------9---------------------
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62 |
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63 | DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
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64 | DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(SPI1->DR);
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65 |
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66 | DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&(u16DoubleBuffer1[0]);
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67 |
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68 | DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//DMA_MemoryInc_Enable;
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69 |
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70 | DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
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71 | DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;//DMA_MemoryDataSize_HalfWord;
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72 | //DMA_InitStructure.DMA_BufferSize = (uint32_t)0x4; //<-wie viel
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73 | DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
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74 | //RX Chanel um zu empfangen
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75 | DMA_Init(DMA1_Channel2, &DMA_InitStructure);
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76 | //PufferWahl();
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77 |
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78 | DMA_ITConfig(DMA1_Channel2, DMA_IT_TC, ENABLE);
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79 | //------------------------------------------------------
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80 | SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Rx | SPI_I2S_DMAReq_Tx, ENABLE);
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81 |
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82 | DMA_Cmd(DMA1_Channel2, ENABLE);
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83 | DMA_Cmd(DMA1_Channel3, ENABLE);
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84 |
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85 | InitPWM((uint16_t)fQuantisationTime,0,0);
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86 |
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87 | StartDMATransferToSpeaker(BUFFER_WIDE);
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88 |
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89 | //Stimmt das? nachprüfen
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90 | // while (DMA_GetFlagStatus(DMA1_FLAG_TC2) == RESET) { ; }
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91 |
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92 | // SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Rx | SPI_I2S_DMAReq_Tx, DISABLE);
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93 | // DMA_Cmd(DMA1_Channel2, DISABLE);
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94 | // DMA_Cmd(DMA1_Channel3, DISABLE);
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95 | }
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