FMC连续写数据的波形问题

只看该作者 · 2017-9-16 16:43

本帖最后由 liuwanwei 于 2017-9-16 16:49 编辑

我使用F7来驱动TFT没反应，发现如果连续调用写数据函数，NWE和NE只出现一次跳变，但数据位上又有相应写数据个数的跳变，就证明MCU确实是输出了这么多次数据的，难道速度太快了吗？配置是基于原子的F7例程来的，不应该呀。
如果在每个写数据函数之间加个1微秒廷时，则波形是对的。
有哪们兄弟遇到过这个问题？
图片2是有问题的波形，图片1是加了1us廷时后的波形。
下面是测试写的程序段

  while(1)
  {
LCD_WR_REG(0x00<<14);
delay_us(1);
LCD_WR_REG(0x01<<14);
delay_us(1);
LCD_WR_REG(0x02<<14);
delay_us(1);
LCD_WR_REG(0x03<<14);
delay_us(10);
  }
下面是FMC和MPU的配置：
LCD_MPU_Config();                      //Ê¹ÄÜMPU±£»¤LCDÇøÓò
SRAM_Handler.Instance=FMC_NORSRAM_DEVICE;
SRAM_Handler.Extended=FMC_NORSRAM_EXTENDED_DEVICE;

SRAM_Handler.Init.NSBank=FMC_NORSRAM_BANK4;    //Ê¹ÓÃNE4
SRAM_Handler.Init.DataAddressMux=FMC_DATA_ADDRESS_MUX_DISABLE; //²»¸´ÓÃÊý¾ÝÏß
SRAM_Handler.Init.MemoryType=FMC_MEMORY_TYPE_SRAM; //SRAM
SRAM_Handler.Init.MemoryDataWidth=FMC_NORSRAM_MEM_BUS_WIDTH_16; //16Î»Êý¾Ý¿í¶È
SRAM_Handler.Init.BurstAccessMode=FMC_BURST_ACCESS_MODE_DISABLE; //ÊÇ·ñÊ¹ÄÜÍ»·¢·ÃÎÊ,½ö¶ÔÍ¬²½Í»·¢´æ´¢Æ÷ÓÐÐ§,´Ë´¦Î´ÓÃµ½
SRAM_Handler.Init.WaitSignalPolarity=FMC_WAIT_SIGNAL_POLARITY_LOW;//µÈ´ýÐÅºÅµÄ¼«ÐÔ,½öÔÚÍ»·¢Ä£Ê½·ÃÎÊÏÂÓÐÓÃ
SRAM_Handler.Init.WaitSignalActive=FMC_WAIT_TIMING_BEFORE_WS; //´æ´¢Æ÷ÊÇÔÚµÈ´ýÖÜÆÚÖ®Ç°µÄÒ»¸öÊ±ÖÓÖÜÆÚ»¹ÊÇµÈ´ýÖÜÆÚÆÚ¼äÊ¹ÄÜNWAIT
SRAM_Handler.Init.WriteOperation=FMC_WRITE_OPERATION_ENABLE; //´æ´¢Æ÷Ð´Ê¹ÄÜ
SRAM_Handler.Init.WaitSignal=FMC_WAIT_SIGNAL_DISABLE;          //µÈ´ýÊ¹ÄÜÎ»,´Ë´¦Î´ÓÃµ½
SRAM_Handler.Init.ExtendedMode=FMC_EXTENDED_MODE_ENABLE;       //¶ÁÐ´Ê¹ÓÃ²»Í¬µÄÊ±Ðò
SRAM_Handler.Init.AsynchronousWait=FMC_ASYNCHRONOUS_WAIT_DISABLE;//ÊÇ·ñÊ¹ÄÜÍ¬²½´«ÊäÄ£Ê½ÏÂµÄµÈ´ýÐÅºÅ,´Ë´¦Î´ÓÃµ½
SRAM_Handler.Init.WriteBurst=FMC_WRITE_BURST_DISABLE;          //½ûÖ¹Í»·¢Ð´
SRAM_Handler.Init.ContinuousClock=FMC_CONTINUOUS_CLOCK_SYNC_ASYNC;

//FSMC¶ÁÊ±Ðò¿ØÖÆ¼Ä´æÆ÷
FSMC_ReadWriteTim.AddressSetupTime=0x11; //µØÖ·½¨Á¢Ê±¼ä(ADDSET)Îª17¸öHCLK 1/216M=4.6ns*17=78ns
FSMC_ReadWriteTim.AddressHoldTime=0x00;
FSMC_ReadWriteTim.DataSetupTime=0x55;    //Êý¾Ý±£´æÊ±¼ä(DATAST)Îª85¸öHCLK =4.6*85=391ns
FSMC_ReadWriteTim.AccessMode=FMC_ACCESS_MODE_A; //Ä£Ê½A
//FSMCÐ´Ê±Ðò¿ØÖÆ¼Ä´æÆ÷
FSMC_WriteTim.AddressSetupTime=0x15;       //µØÖ·½¨Á¢Ê±¼ä(ADDSET)Îª21¸öHCLK=96ns
FSMC_WriteTim.AddressHoldTime=0x00;
FSMC_WriteTim.DataSetupTime=0x15;          //Êý¾Ý±£´æÊ±¼ä(DATAST)Îª4.6ns*21¸öHCLK=96ns
FSMC_WriteTim.AccessMode=FMC_ACCESS_MODE_A;    //Ä£Ê½A
HAL_SRAM_Init(&SRAM_Handler,&FSMC_ReadWriteTim,&FSMC_WriteTim);

//ÅäÖÃMPUµÄregion(SRAMÇøÓòÎªÍ¸Ð´Ä£Ê½)
void LCD_MPU_Config(void)
{
MPU_Region_InitTypeDef MPU_Initure;
HAL_MPU_Disable();    //ÅäÖÃMPUÖ®Ç°ÏÈ¹Ø±ÕMPU,ÅäÖÃÍê³ÉÒÔºóÔÚÊ¹ÄÜMPU
//Íâ²¿SRAMÎªregion0£¬´óÐ¡Îª2MB£¬´ËÇøÓò¿É¶ÁÐ´
MPU_Initure.Enable=MPU_REGION_ENABLE;    //Ê¹ÄÜregion
MPU_Initure.Number=LCD_REGION_NUMBER;  //ÉèÖÃregion£¬Íâ²¿SRAMÊ¹ÓÃµÄregion0
MPU_Initure.BaseAddress=LCD_ADDRESS_START; //region»ùµØÖ·
MPU_Initure.Size=LCD_REGION_SIZE; //region´óÐ¡
MPU_Initure.SubRegionDisable=0X00;
MPU_Initure.TypeExtField=MPU_TEX_LEVEL0;
MPU_Initure.AccessPermission=MPU_REGION_FULL_ACCESS; //´Ëregion¿É¶ÁÐ´
MPU_Initure.DisableExec=MPU_INSTRUCTION_ACCESS_ENABLE; //ÔÊÐí¶ÁÈ¡´ËÇøÓòÖÐµÄÖ¸Áî
MPU_Initure.IsShareable=MPU_ACCESS_NOT_SHAREABLE;
MPU_Initure.IsCacheable=MPU_ACCESS_NOT_CACHEABLE;
MPU_Initure.IsBufferable=MPU_ACCESS_BUFFERABLE;
HAL_MPU_ConfigRegion(&MPU_Initure);
HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);    //¿ªÆôMPU
}