stm32如何读取并⼝_STM32的并⼝总线的所有接⼝类型解决
⽅法
STM32 的并⼝总线的所有接⼝类型解决⽅法
STM32的并⼝总线⽀持NOR, SRAM, PSRAM,NAND接⼝，本⽂以PSRAM为例实现并⼝的同步⾮复⽤， 异步复⽤和异步⾮复⽤操作！以STM32F207IG(176脚)系列为例，步骤如下：
1. 初始化并⼝的各个引脚
//Add[0-25] : F0-F5(6); F12-F15(4); G0-G5(6); D11-D13(3); E3-E6(4); E2(1); G13-G14(2)
//Data[0-15]: D14-D15(2);D0-1(2);E7-15(9);D8-10(3)
//FSMC_NIORD: F6 NC for PC CARD
//FSMC_NREG : F7 NC for PC CARD
//FSMC_NIOWR: F8 NC for PC CARD
//FSMC_CD : F9 NC for PC CARD
//FSMC_INTR : F10 NC for PC CARD
//FSMC_INT2 : G6 NC for COMMON
//FSMC_INT3 : G7 NC for COMMON
//FSMC_CLK : D3 for NOR/PSRAM
//FSMC_NOE : D4 for COMMON
//FSMC_NWE : D5 for COMMON
//FSMC_NWAIT: D6 for COMMON
//FSMC_NE1 : D7 FSMC_NCE2 for NOR/PSRAM for NAND
//FSMC_NE2 : G9 FSMC_NCE3 for NOR/PSRAM for NAND
//FSMC_NE3 : G10 NC for NOR/PSRAM
//FSMC_NCE4 : G11 NC for NOR/PSRAM
/
/FSMC_NE4 : G12 NC for NOR/PSRAM
//FSMC_NL : B7 for NOR/PSRAM
//FSMC_NBL0 : E0 for NOR/PSRAM
//FSMC_NBL1 : E1 for NOR/PSRAM
void FsmcInit(void)
{
u8 i=0;
// 1.
GPIO_InitTypeDef GPIO_InitStructure;周朴园
RCC_AHB3PeriphClockCmd(RCC_AHB3Periph_FSMC, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB | RCC_AHB1Periph_GPIOD | RCC_AHB1Periph_GPIOE | RCC_AHB1Periph_GPIOF | RCC_AHB1Periph_GPIOG, ENABLE);
for(i=0; i
{
GPIO_PinAFConfig((GPIO_TypeDef *)GPIOx, GPIO_PinSourceX, GPIO_AF_FSMC);
}
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 ;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOD, &GPIO_InitStructure);
for(i=0; i
{
GPIO_InitStructure.GPIO_Pin = (1<
GPIO_Init((GPIO_TypeDef *)GPIOx, &GPIO_InitStructure);
}
// FSMC_NWAIT: D6
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 ;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;雾凇大桥
GPIO_Init(GPIOD, &GPIO_InitStructure);
FsmcBank1BusTypeInit(FSMC_TYPE_NOMUX_SYN, FSMC_Bank1_NORSRAM1, FSMC_MemoryType_PSRAM,
FSMC_MemoryDataWidth_16b);
人源化抗体// FsmcBank1BusTypeInit(FSMC_TYPE_MUX_ASYN, FSMC_Bank1_NORSRAM1, FSMC_MemoryType_PSRAM, FSMC_MemoryDataWidth_16b);
// FsmcBank1BusTypeInit(FSMC_TYPE_NOMUX_ASYN, FSMC_Bank1_NORSRAM1, FSMC_MemoryType_PSRAM, FSMC_MemoryDataWidth_16b);
}
2. 初始化FSMC
u8 FsmcBank1BusTypeInit(u8 uchBusType, u32 uiBank1Numb, u32 uiMemType, u32 uiDataWide)
{
FSMC_NORSRAMInitTypeDef FSMC_NORSRAMInitStructure;
FSMC_NORSRAMTimingInitTypeDef FSMC_NORSRAMTimingRead;
FSMC_NORSRAMTimingInitTypeDef FSMC_NORSRAMTimingWrite;
if(((FSMC_TYPE_NOMUX_SYN == uchBusType)||(FSMC_TYPE_MUX_SYN == uchBusType)) &&(uiMemType ==
FSMC_MemoryType_NOR))
{//同步访问Nor 只⽀持读操作
return FSMC_OPT_FAIL;
}
// 0.默认初始化结构体，读写的时序
FSMC_NORSRAMInitStructure.FSMC_ReadWriteTimingStruct = &FSMC_NORSRAMTimingRead;
FSMC_NORSRAMInitStructure.FSMC_WriteTimingStruct = &FSMC_NORSRAMTimingWrite;
FSMC_NORSRAMStructInit(&FSMC_NORSRAMInitStructure);
// 1. 总线类型初始化
FSMC_NORSRAMInitStructure.FSMC_Bank = uiBank1Numb;
FSMC_NORSRAMInitStructure.FSMC_MemoryType = uiMemType;
FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth = uiDataWide;
// 2.根据芯⽚类型初始化
if((FSMC_TYPE_NOMUX_SYN == uchBusType)||(FSMC_TYPE_MUX_SYN == uchBusType))
{//同PSRAM, 同步⾮复⽤
if(FSMC_TYPE_MUX_SYN == uchBusType)
{
FSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Enable;
}
else
{
FSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Disable;
}
FSMC_NORSRAMInitStructure.FSMC_BurstAccessMode = FSMC_BurstAccessMode_Enable; //同步模式下使⽤，for NOR Flash(PSRAM)
vero
// 2.2. 其他设置，burst模式禁⽤,burst mode disable: Paras. valid only when accessing Flash memories in burst mode
FSMC_NORSRAMInitStructure.FSMC_WriteBurst = FSMC_WriteBurst_Enable; //在同步模式下⽀持Write burst，但读时⽆效； 异步模式下设0，禁⽤，表⽰在异步模式下写操作总是容许的
FSMC_NORSRAMInitStructure.FSMC_AsynchronousWait = FSMC_AsynchronousWait_Disable; //异步操作时是否采⽤NWAIT信号来进⾏数据准备的延时 FSMC_NORSRAMInitStructure.FSMC_ExtendedMode = FSMC_ExtendedMode_Disable; //是否⽀持扩展模式
A,B,C,D，根据需要来设定
FSMC_NORSRAMInitStructure.FSMC_WaitSignal = FSMC_WaitSignal_Enable; //在burst模式下，是否插⼊NWAIT 等待延时信号 ，同步必须插
FSMC_NORSRAMInitStructure.FSMC_WriteOperation = FSMC_WriteOperation_Enable; //是否⽀持写操作
FSMC_NORSRAMInitStructure.FSMC_WaitSignalActive = FSMC_WaitSignalActive_DuringWaitState; // 延时等待信号在FSMC_WaitSignalPolarity时表⽰正在等待，不是之前⼀个时钟周期类在等待
FSMC_NORSRAMInitStructure.FSMC_WrapMode = FSMC_WrapMode_Disable; //对总线宽度不⼀致时使⽤
FSMC_NORSRAMInitStructure.FSMC_WaitSignalPolarity = FSMC_WaitSignalPolarity_Low; //异步操作若开启延时，此表⽰延迟等待的电平，⾮此电平表⽰延时结束，for NOR Flash(PSRAM) WAITEN、WAITCFG、WAITPOL
// 2.3 延时时间设置，根据芯⽚来设计，同步模式，下列前三个不⽤设置 FSMC_NORSRAMTimingRead.FSMC_AddressSetupTime = 10; //地址建⽴时间的持续时间, 异步使⽤
FSMC_NORSRAMTimingRead.FSMC_AddressHoldTime = 5; //地址的建⽴后的保持时间, 异步使⽤
FSMC_NORSRAMTimingRead.FSMC_DataSetupTime = 10; //数据建⽴时间的持续时间，异步复⽤中使⽤
FSMC_NORSRAMTimingRead.FSMC_BusTurnAroundDuration = 2; //总线周转时间?!, 复⽤模式使⽤
FSMC_NORSRAMTimingRead.FSMC_CLKDivision = 3; //定义输出时钟分频， 同步使⽤， 0x0 to get CLK =
HCLK(个别芯⽚不⽀持)，0x1 to get CLK = 2 × HCLK，... , 0x0f; ==2,clk == 40M,==3,clk == 30M
FSMC_NORSRAMTimingRead.FSMC_DataLatency = 0; //内存时钟周期数， 同步使⽤, DataLatency = 1 for NOR Flash; DataLatency = 0 for PSRAM
FSMC_NORSRAMTimingRead.FSMC_AccessMode = FSMC_AccessMode_A;//Specifies the asynchronous access mode
memcpy((u8 *)&FSMC_NORSRAMTimingWrite, (u8 *)&FSMC_NORSRAMTimingRead,
sizeof(FSMC_NORSRAMTimingInitTypeDef));
}877uu
else if((FSMC_TYPE_MUX_ASYN == uchBusType) || (FSMC_TYPE_NOMUX_ASYN == uchBusType))
{ //异步复⽤模式, 异步⾮复⽤
// 2.1 总线类型
if(FSMC_TYPE_MUX_ASYN == uchBusType)
{
FSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Enable;
}
else
{
FSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Disable;
}
FSMC_NORSRAMInitStructure.FSMC_BurstAccessMode = FSMC_BurstAccessMode_Disable; //同步模式下使⽤，for NOR Flash(PSRAM)
// 2.2. 其他设置，burst模式禁⽤,burst mode disable: Paras. valid only when accessing Flash memories in burst mode
FSMC_NORSRAMInitStructure.FSMC_WriteBurst = FSMC_WriteBurst_Disable; //在同步模式下⽀持Write burst ；异步模式下设0，禁⽤，表⽰在异步模式下写操作总是容许的
FSMC_NORSRAMInitStructure.FSMC_AsynchronousWait = FSMC_AsynchronousWait_Disable; //异步操作时是否采⽤NWAIT信号来进⾏数据准备的延时
FSMC_NORSRAMInitStructure.FSMC_ExtendedMode = FSMC_ExtendedMode_Disable; //是否⽀持扩展模式
A,B,C,D，根据需要来设定
FSMC_NORSRAMInitStructure.FSMC_WaitSignal = FSMC_WaitSignal_Disable; //在burst模式下，是否插⼊NWAIT 等待延时信号
FSMC_NORSRAMInitStructure.FSMC_WriteOperation = FSMC_WriteOperation_Enable; //是否⽀持写操作
FSMC_NORSRAMInitStructure.FSMC_WaitSignalActive = FSMC_WaitSignalActive_BeforeWaitState; // 延时等待信号在FSMC_WaitSignalPolarity时表⽰正在等待，不是之前⼀个时钟周期类在等待
FSMC_NORSRAMInitStructure.FSMC_WrapMode = FSMC_WrapMode_Disable; //对总线宽度不⼀致时使⽤
FSMC_NORSRAMInitStructure.FSMC_WaitSignalPolarity = FSMC_WaitSignalPolarity_High; //异步操作若开启延时，此表⽰延迟等待的电平，⾮此电平表⽰延时结束，for NOR Flash(PSRAM) WAITEN、WAITCFG、WAITPOL
// 2.3 延时时间设置，根据芯⽚来设计
FSMC_NORSRAMTimingRead.FSMC_AddressSetupTime = 20; //地址建⽴时间的持续时间, 异步使⽤
FSMC_NORSRAMTimingRead.FSMC_AddressHoldTime = 5; //地址的建⽴后的保持时间, 异步使⽤
FSMC_NORSRAMTimingRead.FSMC_DataSetupTime = 30; //数据建⽴时间的持续时间，异步复⽤中使⽤
FSMC_NORSRAMTimingRead.FSMC_BusTurnAroundDuration = 5; //总线周转时间?!, 复⽤模式使⽤
FSMC_NORSRAMTimingRead.FSMC_CLKDivision = 1; //定义输出时钟分频， 同步使⽤， 0x0 to get CLK =
HCLK(个别芯⽚不⽀持)，0x1 to get CLK = 2 × HCLK，... , 0x0f;
FSMC_NORSRAMTimingRead.FSMC_DataLatency = 0; //内存时钟周期数， 同步使⽤, DataLatency = 1 for NOR Flash; DataLatency = 0 for PSRAM神圣
FSMC_NORSRAMTimingRead.FSMC_AccessMode = FSMC_AccessMode_D;//Specifies the asynchronous access mode
memcpy((u8 *)&FSMC_NORSRAMTimingWrite, (u8 *)&FSMC_NORSRAMTimingRead,
sizeof(FSMC_NORSRAMTimingInitTypeDef));
}
else//FSMC_TYPE_MUX_SYN: 同步复⽤
{
return FSMC_OPT_FAIL;
}
// 5.写配置到REG
FSMC_NORSRAMInit(&FSMC_NORSRAMInitStructure);
FSMC_NORSRAMCmd(uiBank1Numb, ENABLE);
return FSMC_OPT_OK;
}
3. 函数的调⽤
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