STM32 SRAM 配置控制方法,简单易用的的- #include "sram.h"
- #include "usart.h"
-
- //使用NOR/SRAM的 Bank1.sector3,地址位HADDR[27,26]=10
- //对IS61LV25616/IS62WV25616,地址线范围为A0~A17
- //对IS61LV51216/IS62WV51216,地址线范围为A0~A18
- #define Bank1_SRAM3_ADDR ((u32)(0x68000000))
- #define Bank1_SRAM4_ADDR ((u32)(0x6C000000))
-
- //初始化外部SRAM
- void FSMC_SRAM_Init(void)
- {
- FSMC_NORSRAMInitTypeDef FSMC_NORSRAMInitStructure;
- FSMC_NORSRAMTimingInitTypeDef readWriteTiming;
- GPIO_InitTypeDef GPIO_InitStructure;
-
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD|RCC_APB2Periph_GPIOE|RCC_APB2Periph_GPIOF|RCC_APB2Periph_GPIOG,ENABLE);
- RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC,ENABLE);
-
- GPIO_InitStructure.GPIO_Pin = 0xFF33; //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 = 0xFF83; //PORTE复用推挽输出
- GPIO_Init(GPIOE, &GPIO_InitStructure);
- GPIO_InitStructure.GPIO_Pin = 0xF03F; //PORTD复用推挽输出
- GPIO_Init(GPIOF, &GPIO_InitStructure);
- GPIO_InitStructure.GPIO_Pin = 0x043F; //PORTD复用推挽输出
- GPIO_Init(GPIOG, &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 = 0x03; //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_NORSRAM3;// 这里我们使用NE3 ,也就对应BTCR[4],[5]。
- FSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Disable;
- FSMC_NORSRAMInitStructure.FSMC_MemoryType =FSMC_MemoryType_SRAM;// FSMC_MemoryType_SRAM; //SRAM
- FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth = FSMC_MemoryDataWidth_16b;//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; //存储器写使能
- 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_NORSRAM3, ENABLE); // 使能BANK3
-
- }
-
- //在指定地址开始,连续写入n个字节.
- //pBuffer:字节指针
- //WriteAddr:要写入的地址
- //n:要写入的字节数
- void FSMC_SRAM_WriteBuffer(u8* pBuffer,u32 WriteAddr,u32 n) ///void FSMC_SRAM_WriteBuffer(u16* pBuffer,u32 WriteAddr,u32 n)
- {
- for(;n!=0;n--)
- {
- *(vu8*)(Bank1_SRAM3_ADDR+WriteAddr)=*pBuffer; // *(vu16*)(Bank1_SRAM3_ADDR+WriteAddr)=*pBuffer;
- WriteAddr+=1;//这里需要加2,是因为STM32的FSMC地址右移一位对其.加2相当于加1.
- pBuffer++;
- }
- }
- //在指定地址开始,连续读出n个字节.
- //pBuffer:字节指针
- //ReadAddr:要读出的起始地址
- //n:要写入的字节数
- void FSMC_SRAM_ReadBuffer(u8* pBuffer,u32 ReadAddr,u32 n) ///void FSMC_SRAM_ReadBuffer(u16* pBuffer,u32 ReadAddr,u32 n)
- {
- for(;n!=0;n--)
- {
- *pBuffer++=*(vu8*)(Bank1_SRAM3_ADDR+ReadAddr); // *pBuffer++=*(vu16*)(Bank1_SRAM3_ADDR+ReadAddr);
- ReadAddr+=1;//这里需要加2,是因为STM32的FSMC地址右移一位对其.加2相当于加1.
- }
- }
- ////////////////////////////////////////////////////////////////////////////////////////
- //测试函数
- //在指定地址写入1个字节
- //addr:地址
- //data:要写入的数据
- void fsmc_sram_test_write(u8 *data,u32 addr)//void fsmc_sram_test_write(u16 data,u32 addr)
- {
- FSMC_SRAM_WriteBuffer(data,addr,250);//写入1个字节
- }
- //读取1个字节
- //addr:要读取的地址
- //返回值:读取到的数据
- u8 fsmc_sram_test_read(u32 addr) //u16 fsmc_sram_test_read(u32 addr)
- {
- u8 data; //u16 data;
- FSMC_SRAM_ReadBuffer(&data,addr,1);
- return data;
- }
- void FSMC_FPGA_Init(void)
- {
- FSMC_NORSRAMInitTypeDef FSMC_NORSRAMInitStructure;
- FSMC_NORSRAMTimingInitTypeDef readWriteTiming;
- GPIO_InitTypeDef GPIO_InitStructure;
-
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD|RCC_APB2Periph_GPIOE|RCC_APB2Periph_GPIOF|RCC_APB2Periph_GPIOG,ENABLE);
- RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC,ENABLE);
-
- GPIO_InitStructure.GPIO_Pin = 0xFF33; //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 = 0xFF83; //PORTE复用推挽输出
- GPIO_Init(GPIOE, &GPIO_InitStructure);
- GPIO_InitStructure.GPIO_Pin = 0xF03F; //PORTD复用推挽输出
- GPIO_Init(GPIOF, &GPIO_InitStructure);
- GPIO_InitStructure.GPIO_Pin = 0x143F; //PORTD复用推挽输出
- GPIO_Init(GPIOG, &GPIO_InitStructure);
-
-
-
-
- readWriteTiming.FSMC_AddressSetupTime = 0x0f; //地址建立时间(ADDSET)为1个HCLK 1/36M=27ns
- readWriteTiming.FSMC_AddressHoldTime = 0x0f; //地址保持时间(ADDHLD)模式A未用到
- readWriteTiming.FSMC_DataSetupTime = 0xff; //数据保持时间(DATAST)为3个HCLK 4/72M=55ns(对EM的SRAM芯片) //0x03;
- 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_NORSRAM4;// 这里我们使用NE3 ,也就对应BTCR[4],[5]。
- 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; //存储器写使能
- 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_NORSRAM4, ENABLE); // 使能BANK3
-
- }
- //在指定地址开始,连续写入n个字节.
- //pBuffer:字节指针
- //WriteAddr:要写入的地址
- //n:要写入的字节数
- void FSMC_FPGA_WriteBuffer(u8* pBuffer,u32 WriteAddr,u32 n) ///void FSMC_SRAM_WriteBuffer(u16* pBuffer,u32 WriteAddr,u32 n)
- {
- for(;n!=0;n--)
- {
- *(vu8*)(Bank1_SRAM4_ADDR+WriteAddr)=*pBuffer; // *(vu16*)(Bank1_SRAM3_ADDR+WriteAddr)=*pBuffer;
- WriteAddr+=1;//这里需要加2,是因为STM32的FSMC地址右移一位对其.加2相当于加1.
- pBuffer++;
- }
- }
- //在指定地址开始,连续读出n个字节.
- //pBuffer:字节指针
- //ReadAddr:要读出的起始地址
- //n:要写入的字节数
- void FSMC_FPGA_ReadBuffer(u8* pBuffer,u32 ReadAddr,u32 n) ///void FSMC_SRAM_ReadBuffer(u16* pBuffer,u32 ReadAddr,u32 n)
- {
- for(;n!=0;n--)
- {
- *pBuffer++=*(vu8*)(Bank1_SRAM4_ADDR+ReadAddr); // *pBuffer++=*(vu16*)(Bank1_SRAM3_ADDR+ReadAddr);
- ReadAddr+=1;//这里需要加2,是因为STM32的FSMC地址右移一位对其.加2相当于加1.
- }
- }
- ////////////////////////////////////////////////////////////////////////////////////////
- //测试函数
- //在指定地址写入1个字节
- //addr:地址
- //data:要写入的数据
- void fsmc_fpga_test_write(u8 data,u32 addr)//void fsmc_sram_test_write(u16 data,u32 addr)
- {
- FSMC_FPGA_WriteBuffer(&data,addr,1);//写入1个字节
- }
- //读取1个字节
- //addr:要读取的地址
- //返回值:读取到的数据
- u8 fsmc_fpga_test_read(u32 addr) //u16 fsmc_sram_test_read(u32 addr)
- {
- u8 data; //u16 data;
- FSMC_FPGA_ReadBuffer(&data,addr,1);
- return data;
- }
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