SIOC 實驗 6 ： DMA

WU-YANG Technology Co., Ltd.

SIOC 實驗 6 ： DMA

黃彥翔 /陳慶瀚MIAT實驗室

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實驗目的控制 DMA自動搬一記憶體或周邊之資料，並透過 VCP傳送到超級終端機顯示操作過程。

實作重點 DMA的控制

Polling Interrupt

SIOC DMA 簡介

DMA(Direct Memory Access)，無須 CPU可直接控制記憶體，透過 DMA，能使 CPU的效率大為提高。

最多有兩個 DMA控制器， DMA1 有 7 個通道，每個通道專門用來管理來自一個或多個外部的請求，還有一個仲裁器來協調各個 DMA請求的優先權。

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DMA Registers

DMA Channel Mapping

5

DMA Request Mapping

6

DMA Interrupt Status Register

7

DMA Interrupt Status Register Cont.,

8

DMA Interrupt Flag Clear Register

9

DMA Channel x Configuration Register

10

DMA Channel x Configuration Register Cont.,

11

DMA Channel x Configuration Register Cont.,

12

DMA Channel x Number of Data Register

13

DMA Channel x Peripheral Address Register

14

DMA Channel x Memory Address Register

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DMA Register Mapping

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DMA Register Mapping Cont.,

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18


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DMA Standard Driver Library

DMA Standard Driver Library List

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DMA DeInit Function

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DMA Init Function

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DMA Init Function Cont.,

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25


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DMA Command Function

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DMA Interrupt Function

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DMA Interrupt Function Cont.,

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DMA Get CurrDataCounter Function

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DMA Get Flag Status Function

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DMA Get Flag Status Function Cont.,

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DMA Clear Flag Function

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DMA Get Interrupt Status Function

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DMA Get Interrupt Status Function Cont.,

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DMA Clear Interrupt Pending Bit Function

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實驗 1 – Polling DMA

Goal Use DMA to copy data from memory to memory

Principle Check the DMA flag

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Development Flow

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Embedded Software Side Download Program to the Flash of the STM32

0

1

2

3

4

RCC Configure

NVIC Configure

DMA Configure

Check DMA Complete Flag

=1

=1

=1

=1

=1

RCC Configure

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/* RCC Configure *//* DMA1 clock enable */ RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

Turn On DMA1 Clock

DMA Configure

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/* DMA Configure */void DMA_Configuration(void){ DMA_InitTypeDef DMA_InitStructure;

/* DMA1 channel6 configuration */ DMA_DeInit(DMA1_Channel6); DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)SRC_Const_Buffer; DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)DST_Buffer; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; DMA_InitStructure.DMA_BufferSize = BufferSize; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Enable; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word; DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; DMA_InitStructure.DMA_Priority = DMA_Priority_High; DMA_InitStructure.DMA_M2M = DMA_M2M_Enable; DMA_Init(DMA1_Channel6, &DMA_InitStructure);}

User Program

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/* User Program */ while (DMA_GetFlagStatus(DMA1_FLAG_TC5) == RESET); DMA_ClearFlag(DMA1_FLAG_TC5); DMA_Configuration(); //DMA_Cmd(DMA1_Channel5, ENABLE);

實驗 2 – Interrupt DMA

Goal Use DMA to copy data from memory to memory

Principle Use the DMA Interrupt

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Development Flow

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Download Program to the Flash of the STM32F103C8

0

1

2

3

4

RCC Configure

NVIC Configure

DMA Configure

Check DMA Interrupt

=1

=1

=1

=1

=1

SIOC 實驗 6 ： DMA

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