使用FSMC模块调用延时函数会无故拉高FSMC_D2和FSMC_D3

lee119 · 发表于 2014-11-17 12:02:37

各位大神麻烦进来看一下，不胜感激！小弟最近使用FSMC功能外接FPGA，FPGA内是一个FIFO模块，当做外部SRAM使用。FSMC驱动代码和原子老大的差不多，可是在main函数中，如果加入延时函数的话，FSMC_D2和FSMC_D3引脚会被直接拉到高电平，不论写入的是什么样的数据都是如此，而其他数据位则可以正常响应。当删除延时函数时，则恢复正常，。困扰我很久了啊，完全不知道怎么回事。

FSMC驱动代码：

[mw_shl_code=c,true]#include "fsmc1.h" #define Bank1_SRAM1_ADDR ((u32)(0x60000000)) void FSMC1_Init(void) { FSMC_NORSRAMInitTypeDef FSMC_NORSRAMInitStructure; FSMC_NORSRAMTimingInitTypeDef readWriteTiming; GPIO_InitTypeDef GPIO_InitStructure; RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD|RCC_APB2Periph_GPIOE|RCC_APB2Periph_GPIOB,ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_14|GPIO_Pin_15; // //PORTD复用推挽输出 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOD, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_7|GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOE, &GPIO_InitStructure); readWriteTiming.FSMC_AddressSetupTime = 0x00; //地址建立时间（ADDSET）为1个HCLK 1/36M=27ns readWriteTiming.FSMC_AddressHoldTime = 0x00; //地址保持时间（ADDHLD）模式A未用到 readWriteTiming.FSMC_DataSetupTime = 0x01; //数据保持时间（DATAST）为3个HCLK 4/72M=55ns(对EM的SRAM芯片) readWriteTiming.FSMC_BusTurnAroundDuration = 0x00; readWriteTiming.FSMC_CLKDivision = 0x00; readWriteTiming.FSMC_DataLatency = 0x00; readWriteTiming.FSMC_AccessMode = FSMC_AccessMode_A; //模式A FSMC_NORSRAMInitStructure.FSMC_Bank = FSMC_Bank1_NORSRAM1; FSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Disable; FSMC_NORSRAMInitStructure.FSMC_MemoryType =FSMC_MemoryType_SRAM;// FSMC_MemoryType_SRAM; //SRAM FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth = FSMC_MemoryDataWidth_8b;//存储器数据宽度为16bit FSMC_NORSRAMInitStructure.FSMC_BurstAccessMode =FSMC_BurstAccessMode_Disable;// FSMC_BurstAccessMode_Disable; FSMC_NORSRAMInitStructure.FSMC_WaitSignalPolarity = FSMC_WaitSignalPolarity_Low; FSMC_NORSRAMInitStructure.FSMC_AsynchronousWait=FSMC_AsynchronousWait_Disable; 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; // 读写使用相同的时序 FSMC_NORSRAMInitStructure.FSMC_WriteBurst = FSMC_WriteBurst_Disable; FSMC_NORSRAMInitStructure.FSMC_ReadWriteTimingStruct = &readWriteTiming; FSMC_NORSRAMInitStructure.FSMC_WriteTimingStruct = &readWriteTiming; //读写同样时序 FSMC_NORSRAMInit(&FSMC_NORSRAMInitStructure); //初始化FSMC配置 FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM1, ENABLE); } void FSMC_FIFO1_WriteBuffer(u8* pBuffer,u32 WriteAddr,u32 n) { for(;n!=0;n--) { *(vu8*)(Bank1_SRAM1_ADDR+WriteAddr)=*pBuffer; WriteAddr+=1; pBuffer++; } } void FSMC_FIFO1_ReadBuffer(u8* pBuffer,u32 ReadAddr,u32 n) { for(;n!=0;n--) { *pBuffer++=*(vu8*)(Bank1_SRAM1_ADDR+ReadAddr); ReadAddr+=1; } } [/mw_shl_code]

未加入延时函数时的main函数代码：

[mw_shl_code=c,true]#include "led.h" #include "uart.h" #include "fsmc1.h" #include "stm32f10x.h" void Delay (uint32_t nCount) { for(; nCount!=0;nCount--); } int main() { u32 i=0; u8 temp=0x00; LED_Init(); UART_Init(); FSMC1_Init(); LED0_On; while(1) { FSMC_FIFO1_WriteBuffer(&temp,i,1); } } [/mw_shl_code]

加入了延时函数的main函数代码（FSMC_D2和FSMC_D3直接被拉高）：

[mw_shl_code=c,true]#include "led.h" #include "uart.h" #include "fsmc1.h" #include "stm32f10x.h" void Delay (uint32_t nCount) { for(; nCount!=0;nCount--); } int main() { u32 i=0; u8 temp=0x00; LED_Init(); UART_Init(); FSMC1_Init(); LED0_On; while(1) { FSMC_FIFO1_WriteBuffer(&temp,i,1); Dealy(0x50000); } }[/mw_shl_code]

求大神救命啊！感激不尽！