FSMC驱动8位显示屏时序问题

m986883511 · 发表于 2016-5-20 19:17:28

刚学FSMC，直接上手的F4，碰到点问题，希望大家看看。为什么只操作4次，却有8次读写呢？？
stm32主频以降低到8M，逻辑分析仪是肯定能采到的
程序：
//#define LCD_RAM *(vu16*)((u32)0x60020000)  //disp Data ADDR
#define LCD_RAM *(vu16*)((u32)0x60010000)  //disp Data ADDR
#define LCD_REG *(vu16*)((u32)0x60000000)    //disp Reg  ADDR

while(1)
{
LCD_RAM = 0X01;
LCD_RAM = 0X02;
LCD_RAM = 0X04;
LCD_RAM = 0X08;
delay_us(1);

LCD_REG = 0X01;
LCD_REG = 0X02;
LCD_REG = 0X04;
LCD_REG = 0X08;
delay_us(1);
}

配置：
void LCD_LineConf(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD | RCC_AHB1Periph_GPIOE , ENABLE);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_4 | GPIO_Pin_5 |
               GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_14 | GPIO_Pin_15;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOD, &GPIO_InitStructure);
    GPIO_PinAFConfig(GPIOD, GPIO_PinSource0, GPIO_AF_FSMC);
    GPIO_PinAFConfig(GPIOD, GPIO_PinSource1, GPIO_AF_FSMC);
    GPIO_PinAFConfig(GPIOD, GPIO_PinSource4, GPIO_AF_FSMC);
    GPIO_PinAFConfig(GPIOD, GPIO_PinSource5, GPIO_AF_FSMC);
    GPIO_PinAFConfig(GPIOD, GPIO_PinSource8, GPIO_AF_FSMC);
    GPIO_PinAFConfig(GPIOD, GPIO_PinSource9, GPIO_AF_FSMC);
    GPIO_PinAFConfig(GPIOD, GPIO_PinSource10, GPIO_AF_FSMC);
    GPIO_PinAFConfig(GPIOD, GPIO_PinSource14, GPIO_AF_FSMC);
    GPIO_PinAFConfig(GPIOD, GPIO_PinSource15, GPIO_AF_FSMC);
    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);
    GPIO_PinAFConfig(GPIOE, GPIO_PinSource7 , GPIO_AF_FSMC);
    GPIO_PinAFConfig(GPIOE, GPIO_PinSource8 , GPIO_AF_FSMC);
    GPIO_PinAFConfig(GPIOE, GPIO_PinSource9 , GPIO_AF_FSMC);
    GPIO_PinAFConfig(GPIOE, GPIO_PinSource10 , GPIO_AF_FSMC);
    GPIO_PinAFConfig(GPIOE, GPIO_PinSource11 , GPIO_AF_FSMC);
    GPIO_PinAFConfig(GPIOE, GPIO_PinSource12 , GPIO_AF_FSMC);
    GPIO_PinAFConfig(GPIOE, GPIO_PinSource13 , GPIO_AF_FSMC);
    GPIO_PinAFConfig(GPIOE, GPIO_PinSource14 , GPIO_AF_FSMC);
    GPIO_PinAFConfig(GPIOE, GPIO_PinSource15 , GPIO_AF_FSMC);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;//(RS)
    GPIO_Init(GPIOD, &GPIO_InitStructure);
    GPIO_PinAFConfig(GPIOD, GPIO_PinSource11, GPIO_AF_FSMC);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;//(CS)
    GPIO_Init(GPIOD, &GPIO_InitStructure);
    GPIO_PinAFConfig(GPIOD, GPIO_PinSource7, GPIO_AF_FSMC);
}

void LCD_FSMCConf(void)
{
    FSMC_NORSRAMInitTypeDef  FSMC_NORSRAMInitStructure;
    FSMC_NORSRAMTimingInitTypeDef  p;

    RCC_AHB3PeriphClockCmd(RCC_AHB3Periph_FSMC, ENABLE);
    p.FSMC_AddressSetupTime = 4;
    p.FSMC_AddressHoldTime = 2;
    p.FSMC_DataSetupTime = 4;
    p.FSMC_BusTurnAroundDuration = 1;
    p.FSMC_CLKDivision = 1;
    p.FSMC_DataLatency = 2;
    p.FSMC_AccessMode = FSMC_AccessMode_A;
  FSMC_NORSRAMInitStructure.FSMC_Bank = FSMC_Bank1_NORSRAM1;
  FSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Disable;
  FSMC_NORSRAMInitStructure.FSMC_MemoryType = FSMC_MemoryType_SRAM;
  FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth = FSMC_MemoryDataWidth_8b;
  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;
    FSMC_NORSRAMInit(&FSMC_NORSRAMInitStructure);
    FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM1, ENABLE);
}

正点原子 · 发表于 2016-5-20 19:17:29

把这个： *(vu16*)((u32)0x60020000)
改成： *(vu8*)((u32)0x60020000)
试试，看看是不是这个问题导致的。
因为你要写u16数据进去，8位总线的时候，会分两次发送

m986883511 · 发表于 2016-5-20 19:35:57

http://pan.baidu.com/s/1o8IkLDK 这是我的整个工程，帮我看看，不甚感激

正点原子 · 发表于 2016-5-20 20:33:52

操作1次试试

m986883511 · 发表于 2016-5-20 20:43:24

正点原子发表于 2016-5-20 20:33
操作1次试试

是2次

LCD_RAM = 0X01;
delay_us(1);
LCD_REG = 0X01;
delay_us(1);

正点原子 · 发表于 2016-5-20 21:21:29

while(1)
      {
                     LCD_RAM = 0X01;
                        delay_ms(10);

      }
试试这个代码

m986883511 · 发表于 2016-5-20 21:44:21

本帖最后由 m986883511 于 2016-5-20 21:54 编辑

正点原子发表于 2016-5-20 21:21
while(1)
{
LCD_RAM = 0X01;

还是这样的，出现WR写两次

真的是好奇怪，如果我改成 FSMC_MemoryDataWidth_16b ，操作我这个8位屏，高八位不用，地址写成0x60020000 ，其他的什么都没改，就成功驱动了TFT，然后看他的时序是只有一次的。
但我这个是八位屏，用16位就浪费了8个IO口了。

真的是搞不明白为什么写两次呢