STM32的FSMC確實很方便，可以擴展諸如SRAM/NOR/NAND/PC Card/TFT等等，操作起來非常方便。關(guān)于FSMC參考《STM32參考手冊》，上面非常詳細。
工程結(jié)構(gòu)：
user_sram.c
//function of code:FSMC SRAM DriverSRAM chip
#include"stm32f10x.h"
#include"user_sram.h"
void User_SRAM_Config(void)
{
FSMC_NORSRAMTimingInitTypeDefFSMC_NORSRAMTimingInitStructure;
FSMC_NORSRAMInitTypeDefFSMC_NORSRAMInitStructure;
GPIO_InitTypeDefGPIO_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD|
RCC_APB2Periph_GPIOE|
RCC_APB2Periph_GPIOF|
RCC_APB2Periph_GPIOG,ENABLE);
GPIO_InitStructure.GPIO_Pin=FSMC_SRAM_D0_Pin|FSMC_SRAM_D1_Pin|FSMC_SRAM_D2_Pin|
FSMC_SRAM_D3_Pin|FSMC_SRAM_D13_Pin|FSMC_SRAM_D14_Pin|
FSMC_SRAM_D15_Pin;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(FSMC_SRAM_D0_GPIO,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin=FSMC_SRAM_D4_Pin|FSMC_SRAM_D5_Pin|FSMC_SRAM_D6_Pin|
FSMC_SRAM_D7_Pin|FSMC_SRAM_D8_Pin|FSMC_SRAM_D9_Pin|
FSMC_SRAM_D10_Pin|FSMC_SRAM_D11_Pin|FSMC_SRAM_D12_Pin;
GPIO_Init(FSMC_SRAM_D4_GPIO,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin=FSMC_SRAM_A0_Pin|FSMC_SRAM_A1_Pin|FSMC_SRAM_A2_Pin|
FSMC_SRAM_A3_Pin|FSMC_SRAM_A4_Pin|FSMC_SRAM_A5_Pin|
FSMC_SRAM_A6_Pin|FSMC_SRAM_A7_Pin|FSMC_SRAM_A8_Pin|
FSMC_SRAM_A9_Pin;
GPIO_Init(FSMC_SRAM_A0_GPIO,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin=FSMC_SRAM_A10_Pin|FSMC_SRAM_A11_Pin|FSMC_SRAM_A12_Pin|
FSMC_SRAM_A13_Pin|FSMC_SRAM_A14_Pin|FSMC_SRAM_A15_Pin;
GPIO_Init(FSMC_SRAM_A10_GPIO,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin=FSMC_SRAM_A16_Pin|FSMC_SRAM_A17_Pin|FSMC_SRAM_A18_Pin;
GPIO_Init(FSMC_SRAM_A16_GPIO,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin=FSMC_SRAM_NE3_Pin;
GPIO_Init(FSMC_SRAM_NE3_GPIO,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin=FSMC_SRAM_NWE_Pin|FSMC_SRAM_NOE_Pin;
GPIO_Init(FSMC_SRAM_NWE_GPIO,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin=FSMC_SRAM_NBL0_Pin|FSMC_SRAM_NBL1_Pin;
GPIO_Init(FSMC_SRAM_NBL0_GPIO,&GPIO_InitStructure);
FSMC_NORSRAMTimingInitStructure.FSMC_AddressSetupTime=0;
FSMC_NORSRAMTimingInitStructure.FSMC_AddressHoldTime=0;//復(fù)用IO用
FSMC_NORSRAMTimingInitStructure.FSMC_DataSetupTime=1;
FSMC_NORSRAMTimingInitStructure.FSMC_BusTurnAroundDuration=0;//總線恢復(fù)時間
FSMC_NORSRAMTimingInitStructure.FSMC_CLKDivision=0;//同步用
FSMC_NORSRAMTimingInitStructure.FSMC_DataLatency=0;//同步用數(shù)據(jù)產(chǎn)生時間 產(chǎn)生第一個數(shù)據(jù)的時鐘數(shù)目
FSMC_NORSRAMTimingInitStructure.FSMC_AccessMode=FSMC_AccessMode_A;//模式A
FSMC_NORSRAMInitStructure.FSMC_Bank=FSMC_Bank1_NORSRAM3;//FSMC模塊: bank1 sram3
FSMC_NORSRAMInitStructure.FSMC_DataAddressMux=FSMC_DataAddressMux_Disable;//數(shù)據(jù)地址復(fù)用:失能
FSMC_NORSRAMInitStructure.FSMC_MemoryType=FSMC_MemoryType_SRAM;//存儲器類型:SRAM
FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth=FSMC_MemoryDataWidth_16b;//數(shù)據(jù)寬度:8位
FSMC_NORSRAMInitStructure.FSMC_BurstAccessMode=FSMC_BurstAccessMode_Disable;//同步成組模式:失能
FSMC_NORSRAMInitStructure.FSMC_AsynchronousWait=FSMC_AsynchronousWait_Disable;//同步時間等待:失能
FSMC_NORSRAMInitStructure.FSMC_WaitSignalPolarity=FSMC_WaitSignalPolarity_Low;//等待信號極性:低電平 同步模式才有效
FSMC_NORSRAMInitStructure.FSMC_WrapMode=FSMC_WrapMode_Disable;//Bank寫模式:失能
FSMC_NORSRAMInitStructure.FSMC_WaitSignalActive=FSMC_WaitSignalActive_BeforeWaitState; //等待信號位置:Wait信號之前
FSMC_NORSRAMInitStructure.FSMC_WriteOperation=FSMC_WriteOperation_Enable;//寫操作:使能
FSMC_NORSRAMInitStructure.FSMC_WaitSignal=FSMC_WaitSignal_Disable;//等待信號:失能 只在突發(fā)模式有效
FSMC_NORSRAMInitStructure.FSMC_ExtendedMode=FSMC_ExtendedMode_Disable;//擴展模式:失能
FSMC_NORSRAMInitStructure.FSMC_WriteBurst=FSMC_WriteBurst_Disable;
FSMC_NORSRAMInitStructure.FSMC_ReadWriteTimingStruct=&FSMC_NORSRAMTimingInitStructure;//讀操作時序
FSMC_NORSRAMInitStructure.FSMC_WriteTimingStruct=&FSMC_NORSRAMTimingInitStructure;//寫操作時序
FSMC_NORSRAMInit(&FSMC_NORSRAMInitStructure);
FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM3,ENABLE);
}
void User_SRAM_WriteData(uint16_t *WriteData,uint32_t WriteAddress,uint32_t WriteNumberOfHalfWord)
{
for(;WriteNumberOfHalfWord!=0;WriteNumberOfHalfWord--)
{
*(uint16_t*)(FSMC_BANK1_SRAM3_Address+WriteAddress)= *WriteData++;
WriteAddress+=2;
}
}
void User_SRAM_ReadData(uint16_t *ReadData,uint32_t ReadAddress,uint32_t ReadNumberOfHalfWord)
{
for(;ReadNumberOfHalfWord!=0;ReadNumberOfHalfWord--)
{
*ReadData++=*(uint16_t*)(FSMC_BANK1_SRAM3_Address+ReadAddress);
ReadAddress+=2;
}
}
user_sram.h
//FSMC SRAM頭文件
#ifndef _USER_SRAM_H
#define _USER_SRAM_H
#include"stm32f10x.h"
#defineFSMC_BANK1_SRAM3_Address((uint32_t)0x68000000)//0x60000000+(0x6fffffff-0x60000000)/4*2+1
#defineFSMC_SRAM_RCCRCC_AHBPeriph_FSMC
#defineFSMC_SRAM_D0_RCCRCC_APB2Periph_GPIOD
#defineFSMC_SRAM_D0_GPIOGPIOD
#defineFSMC_SRAM_D0_PinGPIO_Pin_14
#defineFSMC_SRAM_D1_RCCRCC_APB2Periph_GPIOD
#defineFSMC_SRAM_D1_GPIOGPIOD
#defineFSMC_SRAM_D1_PinGPIO_Pin_15
#defineFSMC_SRAM_D2_RCCRCC_APB2Periph_GPIOD
#defineFSMC_SRAM_D2_GPIOGPIOD
#defineFSMC_SRAM_D2_PinGPIO_Pin_0
#defineFSMC_SRAM_D3_RCCRCC_APB2Periph_GPIOD
#defineFSMC_SRAM_D3_GPIOGPIOD
#defineFSMC_SRAM_D3_PinGPIO_Pin_1
#defineFSMC_SRAM_D4_RCCRCC_APB2Periph_GPIOE
#defineFSMC_SRAM_D4_GPIOGPIOE
#defineFSMC_SRAM_D4_PinGPIO_Pin_7
#defineFSMC_SRAM_D5_RCCRCC_APB2Periph_GPIOE
#defineFSMC_SRAM_D5_GPIOGPIOE
#defineFSMC_SRAM_D5_PinGPIO_Pin_8
#defineFSMC_SRAM_D6_RCCRCC_APB2Periph_GPIOE
#defineFSMC_SRAM_D6_GPIOGPIOE
#defineFSMC_SRAM_D6_PinGPIO_Pin_9
#defineFSMC_SRAM_D7_RCCRCC_APB2Periph_GPIOE
#defineFSMC_SRAM_D7_GPIOGPIOE
#defineFSMC_SRAM_D7_PinGPIO_Pin_10
#defineFSMC_SRAM_D8_RCCRCC_APB2Periph_GPIOE
#defineFSMC_SRAM_D8_GPIOGPIOE
#defineFSMC_SRAM_D8_PinGPIO_Pin_11
#defineFSMC_SRAM_D9_RCCRCC_APB2Periph_GPIOE
#defineFSMC_SRAM_D9_GPIOGPIOE
#defineFSMC_SRAM_D9_PinGPIO_Pin_12
#defineFSMC_SRAM_D10_RCCRCC_APB2Periph_GPIOE
#defineFSMC_SRAM_D10_GPIOGPIOE
#defineFSMC_SRAM_D10_PinGPIO_Pin_13
#define FSMC_SRAM
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