【GMT43智慧液晶模組】例程十：DMA實驗——儲存器到儲存器的傳輸

實驗原理：

　　DMA(直接儲存器訪問)傳輸不需要佔用CPU，可以在儲存器至儲存器實現高速的資料

傳輸。本實驗採用DMA2控制器的資料流0，選用通道0進行資料傳輸。通過液晶控制傳輸

和結果顯示。

示例截圖：

原始碼下載連結：

連結：https://pan.baidu.com/s/1miXeWVe 密碼：tmrq

GMT43購買連結：

核心程式碼：

static void frame_process(void)
{
	DMA_InitTypeDef  DMA_InitStructure;
	GUI_CURSOR_Show();
	WM_SetCreateFlags(WM_CF_MEMDEV);
  　　　 GUI_CreateDialogBox(_aDialogCreate, GUI_COUNTOF(_aDialogCreate), _cbDialog, WM_HBKWIN, 0, 0);
	
	DMA_InitStructure.DMA_Channel = DMA_Channel_0;                                   
	DMA_InitStructure.DMA_PeripheralBaseAddr = (unsigned long int)src_buffer;        
	DMA_InitStructure.DMA_Memory0BaseAddr = (unsigned long int)dst_buffer;         
	DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToMemory;                             
	DMA_InitStructure.DMA_BufferSize = (unsigned long int)BUFFER_SIZE;              
	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_FIFOMode = DMA_FIFOMode_Disable;                           
	DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;                    
	DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;                      
	DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;              
	DMA_Init(DMA2_Stream0, &DMA_InitStructure);
	
	while(1){
		
		GUI_Exec();
	}
}