fsmc读SRAM,只能读到低8位，高8位始终是0x7F

只看该作者 · 2011-7-28 17:08

本帖最后由 williamt 于 2011-7-28 17:40 编辑

用STM32F103ZG,SRAM 是K6F1616T6B-TF70,
按正常设置，只能写读低8位，高8位始终是7F,
请高手分析分析！！！！

只看该作者 · 2011-7-29 08:36

自己顶，FSMC配置如下
/*-- FSMC Configuration ------------------------------------------------------*/
  p.FSMC_AddressSetupTime = 2;    //0
  p.FSMC_AddressHoldTime =2;    //0
  p.FSMC_DataSetupTime = 8;    //2
  p.FSMC_BusTurnAroundDuration = 0;    //0
  p.FSMC_CLKDivision = 2;    //0
  p.FSMC_DataLatency = 0;    //0
  p.FSMC_AccessMode = FSMC_AccessMode_A;

  FSMC_NORSRAMInitStructure.FSMC_Bank = FSMC_Bank1_NORSRAM3;
  FSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Disable;
  FSMC_NORSRAMInitStructure.FSMC_MemoryType = FSMC_MemoryType_SRAM;
  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_AsyncWait = FSMC_AsyncWait_Disable;
  FSMC_NORSRAMInitStructure.FSMC_WriteBurst = FSMC_WriteBurst_Disable;
  FSMC_NORSRAMInitStructure.FSMC_ReadWriteTimingStruct = &p;
  FSMC_NORSRAMInitStructure.FSMC_WriteTimingStruct = &p;

  FSMC_NORSRAMInit(&FSMC_NORSRAMInitStructure);

  /* Enable FSMC Bank1_SRAM Bank */
  FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM3, ENABLE);

1万 · 2011-7-29 09:54

建议LZ用示波器来看FSMC引脚的波形，特别要关注FSMC_nBL0、FSMC_nBL1，在软件上要检查FSMC_nBL0、FSMC_nBL1对应的IO配置

只看该作者 · 2011-7-29 10:59

nBL0,nBL1也是配置过的
void FSMC_SRAM_Init(void)
{
  FSMC_NORSRAMInitTypeDef  FSMC_NORSRAMInitStructure;
  FSMC_NORSRAMTimingInitTypeDef  p;
  GPIO_InitTypeDef GPIO_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOG | RCC_APB2Periph_GPIOE |
                     RCC_APB2Periph_GPIOF, ENABLE);

/*-- GPIO Configuration ------------------------------------------------------*/
  /* SRAM Data lines configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_8 | GPIO_Pin_9 |
                              GPIO_Pin_10 | GPIO_Pin_14 | GPIO_Pin_15;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOD, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 |
                              GPIO_Pin_11 | GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 |
                              GPIO_Pin_15;
  GPIO_Init(GPIOE, &GPIO_InitStructure);

  /* SRAM Address lines configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 |
                              GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_12 | GPIO_Pin_13 |
                              GPIO_Pin_14 | GPIO_Pin_15;
  GPIO_Init(GPIOF, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 |
                              GPIO_Pin_4 | GPIO_Pin_5;
  GPIO_Init(GPIOG, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 | GPIO_Pin_12 | GPIO_Pin_13;
  GPIO_Init(GPIOD, &GPIO_InitStructure);

  /* NOE and NWE configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 |GPIO_Pin_5;
  GPIO_Init(GPIOD, &GPIO_InitStructure);

  /* NE3 configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_Init(GPIOG, &GPIO_InitStructure);

  /* NBL0, NBL1 configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
  GPIO_Init(GPIOE, &GPIO_InitStructure);

1万 · 2011-7-29 13:24

如果软件检查不出问题，需要检查硬件，需要用万用表和示波器

fsmc读SRAM,只能读到低8位，高8位始终是0x7F

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