如何在STM32F407开发板上实现基于SRAM的数据存储和读取?请提供具体的编程步骤和代码示例。
时间: 2024-10-26 12:04:31 浏览: 23
为了深入理解STM32F407开发板上的数据存储和读取机制,我们推荐参考《STM32F407开发板技术规格与功能介绍》。这本书详细介绍了开发板的硬件特性,包括内置SRAM的使用方法,非常适合初学者和进阶开发者。
参考资源链接:[STM32F407开发板技术规格与功能介绍](https://wenku.csdn.net/doc/29b5ncpycw?spm=1055.2569.3001.10343)
首先,SRAM(静态随机存取存储器)是用于存储临时数据的高速存储器。在STM32F407开发板中,内置了16Mbit的SRAM,可以直接用于数据存储和读取。
具体实现SRAM数据存储和读取的步骤如下:
1. **初始化SRAM**:首先需要通过STM32的外设库函数初始化FSMC(Flexible Static Memory Controller),使其能够与外部SRAM通信。
```c
// 初始化FSMC用于与外部SRAM通信
void SRAM_Init(void)
{
FSMC_NORSRAMTimingTypeDef SRAM_Timing;
FSMC_NORSRAM_TimingInitTypeDef SRAM_TimingStructure;
// 启用FSMC和NOR/SRAM外设的时钟
RCC_AHB3PeriphClockCmd(RCC_AHB3Periph_FSMC, ENABLE);
// 设置FSMC读写时序
SRAM_TimingStructure.AddressSetupTime = 1;
SRAM_TimingStructure.AddressHoldTime = 1;
SRAM_TimingStructure.DataSetupTime = 10;
SRAM_TimingStructure.BusTurnAroundDuration = 1;
SRAM_TimingStructure.CLKDivision = 2;
SRAM_TimingStructure.DataLatency = 1;
SRAM_TimingStructure.AccessMode = FSMC_ACCESS_MODE_A;
FSMC_NORSRAM_TimingInit(&SRAM_TimingStructure);
FSMC_NORSRAM_TimingStructure = SRAM_Timing;
// 初始化FSMC的Bank1
FSMC_NORSRAMInitTypeDef SRAM_InitStructure;
SRAM_InitStructure.FSMC_Bank = FSMC_Bank1_NORSRAM1;
SRAM_InitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Disable;
SRAM_InitStructure.FSMC_MemoryType = FSMC_MemoryType_SRAM;
SRAM_InitStructure.FSMC_MemoryDataWidth = FSMC_MemoryDataWidth_16b;
SRAM_InitStructure.FSMC_BurstAccessMode = FSMC_BurstAccessMode_Disable;
SRAM_InitStructure.FSMC_WaitSignalPolarity = FSMC_WaitSignalPolarity_Low;
SRAM_InitStructure.FSMC_WrapMode = FSMC_WrapMode_Disable;
SRAM_InitStructure.FSMC_WaitSignalActive = FSMC_WaitSignalActive_BeforeWaitState;
SRAM_InitStructure.FSMC_WriteOperation = FSMC_WriteOperation_Enable;
SRAM_InitStructure.FSMC_WaitSignal = FSMC_WaitSignal_Disable;
SRAM_InitStructure.FSMC_ExtendedMode = FSMC_ExtendedMode_Disable;
SRAM_InitStructure.FSMC_AsyncWait = FSMC_AsyncWait_Disable;
SRAM_InitStructure.FSMC_WriteBurst = FSMC_WriteBurst_Disable;
SRAM_InitStructure.FSMC_ReadWriteTimingStruct = &SRAM_Timing;
SRAM_InitStructure.FSMC_WriteTimingStruct = &SRAM_Timing;
FSMC_NORSRAMInit(&SRAM_InitStructure);
// 启用FSMC Bank1
FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM1, ENABLE);
}
```
2. **数据写入SRAM**:接下来,你可以通过指针操作将数据写入SRAM。
```c
// 假设有一个16位数据数组
uint16_t dataToWrite[] = {0x1234, 0x5678, 0x9ABC, 0xDEF0};
// 获取SRAM的起始地址,这通常是FSMC的Bank1区域的起始地址
uint16_t* SRAM_startAddress = (uint16_t*)0x***;
// 将数据写入SRAM
for (int i = 0; i < sizeof(dataToWrite)/sizeof(dataToWrite[0]); i++)
{
*(SRAM_startAddress + i) = dataToWrite[i];
}
```
3. **从SRAM读取数据**:从SRAM读取数据也是一个直接的过程,你可以直接从SRAM的起始地址读取数据。
```c
// 读取数据并打印
for (int i = 0; i < sizeof(dataToWrite)/sizeof(dataToWrite[0]); i++)
{
uint16_t data = *(SRAM_startAddress + i);
printf(
参考资源链接:[STM32F407开发板技术规格与功能介绍](https://wenku.csdn.net/doc/29b5ncpycw?spm=1055.2569.3001.10343)
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