lcd 填充函数用DMA传的问题

39527 · 发表于 2021-2-7 15:31:17

用f407 fsmc 480*800 lcd，借鉴了原老大407的综合程序

void DMA_Config_Init(void)
{

DMA_InitTypeDef  DMA_InitStructure;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2,ENABLE);//DMA2时钟使能
  while (DMA_GetCmdStatus(DMA2_Stream0) != DISABLE){}//等待DMA可配置
  DMA_DeInit(DMA2_Stream0);

  /* 配置 DMA Stream */
  DMA_InitStructure.DMA_Channel = DMA_Channel_0;  //选择通道0
  DMA_InitStructure.DMA_PeripheralBaseAddr =(u32)&LCD->LCD_RAM;//DMA外设地址
  DMA_InitStructure.DMA_Memory0BaseAddr = 0;//DMA 存储器0地址
  DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;//存储器到外设模式
  DMA_InitStructure.DMA_BufferSize = 0;//数据传输量
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外设增量模式
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//存储器非增量模式
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//外设数据长度:16位
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//存储器数据长度:16位
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;// 使用普通模式
  DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;//中等优先级
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_INC8;//存储器突发单次传输
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;//外设突发单次传输
  DMA_Init(DMA2_Stream0, &DMA_InitStructure);//初始化DMA Stream

}

void DMA_LCD_Color_Fill(u16 sx,u16 sy,u16 ex,u16 ey,u16 *color)
{
  u16 i;
u16 Fill_Num = (ex-sx+1)*(ey-sy+1); //要填充的点数
LCD_Set_Window(sx,sy,ex,ey);
LCD_WriteRAM_Prepare();    //开始写入GRAM

for(i=0;Fill_Num>0;Fill_Num-=65535)
{
if(Fill_Num<65535)
{
      DMA_Cmd(DMA2_Stream0,DISABLE);//关闭DMA2,Stream0
      DMA2_Stream0->M0AR=(u32)(color+i*65535); //DMA外设地址
      DMA_SetCurrDataCounter(DMA2_Stream0,(u16)Fill_Num);//设置传输长度
      DMA_Cmd(DMA2_Stream0,ENABLE);//开启DMA2,Stream0
      while(DMA_GetFlagStatus(DMA2_Stream0,DMA_FLAG_TCIF0)!=SET);//等完成
      DMA_Cmd(DMA2_Stream0,DISABLE);//关闭DMA2,Stream0
}else
{
      DMA_Cmd(DMA2_Stream0,DISABLE);//关闭DMA2,Stream0
      DMA2_Stream0->M0AR=(u32)(color+i*65535); //DMA外设地址
      DMA_SetCurrDataCounter(DMA2_Stream0,65535);//设置传输长度
      DMA_Cmd(DMA2_Stream0,ENABLE);//开启DMA2,Stream0
      while(DMA_GetFlagStatus(DMA2_Stream0,DMA_FLAG_TCIF0)!=SET);//等完成
      DMA_Cmd(DMA2_Stream0,DISABLE);//关闭DMA2,Stream0
i++;
}
}

}

39527 · 发表于 2021-2-7 15:31:18

快了快乐

39527 · 发表于 2021-2-7 15:33:46

主要想用littlevgl加速故障现象白屏

39527 · 发表于 2021-2-7 18:55:23

经过不懈努力，终于有点点了

39527 · 发表于 2021-2-7 18:56:53

void DMA_Config_Init(void)
{

DMA_InitTypeDef  DMA_InitStructure;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2,ENABLE);//DMA2时钟使能

  while (DMA_GetCmdStatus(DMA2_Stream0) != DISABLE){}//等待DMA可配置
  DMA_DeInit(DMA2_Stream0);

  /* 配置 DMA Stream */
  DMA_InitStructure.DMA_Channel = DMA_Channel_0;  //选择通道0
  DMA_InitStructure.DMA_PeripheralBaseAddr =0;
  DMA_InitStructure.DMA_Memory0BaseAddr = (u32)&LCD->LCD_RAM;//DMA 存储器地址
  DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToMemory;//存储器到存储器模式
  DMA_InitStructure.DMA_BufferSize = 4800;//数据传输量
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Enable;//外设非增量模式
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;//存储器增量模式
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//外设数据长度:16位
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//存储器数据长度:16位
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;// 使用普通模式
  DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;//中等优先级
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;//存储器突发单次传输
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;//外设突发单次传输
  DMA_Init(DMA2_Stream0, &DMA_InitStructure);//初始化DMA Stream

}