液晶屏通过FSMC 刷新速度的问题

simms01 · 发表于 2013-3-5 10:13:38

有个液晶屏 7寸 800*480 就是那种 CPLD+SDRAM 8088接口的那种方案

我用FSMC接口采用官方提供的参数在stm32运行72m的时候有时候会出现花屏

当 stm的主频降低到 5倍就是5*8 40MHZ的时候花屏消失或者把FSMC的地址建立时间啥的变大也不会花屏

但是这个屏给出stm32的例程是用一个比较快的参数的

我的stm32 挂了1个flash 和一个屏。不能跑比较快的参数是否和布线有关系（我布线功力不行都是随便布的很乱）

另外这个屏支持点读和点写功能（不支持区域读支持区域写）现在我做反色只能读一个点取反然后后写入当写入256*256=65535byte数据会发现反色比较慢

有办法体高速度么我听别人说刷这个屏可以做到几十毫秒但是现在我刷一屏数据需要1秒多（800*480）

simms01 · 发表于 2013-3-5 10:16:56

补充  我现在稳定使用的FSMC参数

FSMC_NORSRAMInitTypeDef  FSMC_NORSRAMInitStructure;
  FSMC_NORSRAMTimingInitTypeDef  p;
  //GPIO_InitTypeDef GPIO_InitStructure;

  //初始化io

/*-- FSMC Configuration ------------------------------------------------------*/
  p.FSMC_AddressSetupTime = 0x10;//
//   p.FSMC_AddressSetupTime = 0x02;//
  p.FSMC_AddressHoldTime = 0x05;
  p.FSMC_DataSetupTime = 0x12;
//  p.FSMC_DataSetupTime = 0x05;
  p.FSMC_BusTurnAroundDuration = 0x05;
  p.FSMC_CLKDivision = 0x05;
  p.FSMC_DataLatency = 0x05;
  p.FSMC_AccessMode = FSMC_AccessMode_B;

  FSMC_NORSRAMInitStructure.FSMC_Bank = FSMC_Bank1_NORSRAM2;
  FSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Disable;
  FSMC_NORSRAMInitStructure.FSMC_MemoryType = FSMC_MemoryType_NOR;
  FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth = FSMC_MemoryDataWidth_16b;
  FSMC_NORSRAMInitStructure.FSMC_BurstAccessMode = FSMC_BurstAccessMode_Disable;
  FSMC_NORSRAMInitStructure.FSMC_WaitSignalPolarity = FSMC_WaitSignalPolarity_Low;
  FSMC_NORSRAMInitStructure.FSMC_WrapMode = FSMC_WrapMode_Disable;
  FSMC_NORSRAMInitStructure.FSMC_WaitSignalActive = FSMC_WaitSignalActive_BeforeWaitState;
  FSMC_NORSRAMInitStructure.FSMC_WriteOperation = FSMC_WriteOperation_Enable;
  FSMC_NORSRAMInitStructure.FSMC_WaitSignal = FSMC_WaitSignal_Disable;
  FSMC_NORSRAMInitStructure.FSMC_ExtendedMode = FSMC_ExtendedMode_Disable;
  FSMC_NORSRAMInitStructure.FSMC_WriteBurst = FSMC_WriteBurst_Disable;
  FSMC_NORSRAMInitStructure.FSMC_ReadWriteTimingStruct = &p;
  FSMC_NORSRAMInitStructure.FSMC_WriteTimingStruct = &p;

simms01 · 发表于 2013-3-5 10:17:34

屏给出的参数

FSMC_NORSRAMInitTypeDef  FSMC_NORSRAMInitStructure;
  FSMC_NORSRAMTimingInitTypeDef  p;
  //GPIO_InitTypeDef GPIO_InitStructure;

  //初始化io

/*-- FSMC Configuration ------------------------------------------------------*/
  p.FSMC_AddressSetupTime = 0x2;

  p.FSMC_AddressHoldTime = 0x00;
  p.FSMC_DataSetupTime = 0x5;

  p.FSMC_BusTurnAroundDuration = 0x00;
  p.FSMC_CLKDivision = 0x00;
  p.FSMC_DataLatency = 0x00;
  p.FSMC_AccessMode = FSMC_AccessMode_B;

  FSMC_NORSRAMInitStructure.FSMC_Bank = FSMC_Bank1_NORSRAM2;
  FSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Disable;
  FSMC_NORSRAMInitStructure.FSMC_MemoryType = FSMC_MemoryType_NOR;
  FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth = FSMC_MemoryDataWidth_16b;
  FSMC_NORSRAMInitStructure.FSMC_BurstAccessMode = FSMC_BurstAccessMode_Disable;
  FSMC_NORSRAMInitStructure.FSMC_WaitSignalPolarity = FSMC_WaitSignalPolarity_Low;
  FSMC_NORSRAMInitStructure.FSMC_WrapMode = FSMC_WrapMode_Disable;
  FSMC_NORSRAMInitStructure.FSMC_WaitSignalActive = FSMC_WaitSignalActive_BeforeWaitState;
  FSMC_NORSRAMInitStructure.FSMC_WriteOperation = FSMC_WriteOperation_Enable;
  FSMC_NORSRAMInitStructure.FSMC_WaitSignal = FSMC_WaitSignal_Disable;
  FSMC_NORSRAMInitStructure.FSMC_ExtendedMode = FSMC_ExtendedMode_Disable;
  FSMC_NORSRAMInitStructure.FSMC_WriteBurst = FSMC_WriteBurst_Disable;
  FSMC_NORSRAMInitStructure.FSMC_ReadWriteTimingStruct = &p;
  FSMC_NORSRAMInitStructure.FSMC_WriteTimingStruct = &p;