以下是SDNAND与MCU通过SPI模式进行通信的详细硬件接线方法和软件代码驱动:
硬件接线方法:
SDNAND SCLK引脚连接到MCU的SPI时钟(SCK)引脚。
SDNAND MOSI引脚连接到MCU的SPI主机数据输出(MOSI)引脚。
SDNAND MISO引脚连接到MCU的SPI主机数据输入(MISO)引脚。
SDNAND CS引脚连接到MCU的GPIO引脚,可以通过此引脚控制SDNAND的片选(CE)信号。
软件代码驱动:
初始化SDNAND:在开始通信前,需要对SDNAND进行初始化,例如发送复位指令、设置SPI模式、设置页大小等。以下是STM32 MCU的初始化代码示例:
// 定义SDNAND的SPI接口引脚 #define SDNAND_SPI SPI1 #define SDNAND_SPI_CLK RCC_APB2Periph_SPI1 #define SDNAND_SPI_SCK_PIN GPIO_Pin_5 #define SDNAND_SPI_SCK_GPIO GPIOA #define SDNAND_SPI_MISO_PIN GPIO_Pin_6 #define SDNAND_SPI_MISO_GPIO GPIOA #define SDNAND_SPI_MOSI_PIN GPIO_Pin_7 #define SDNAND_SPI_MOSI_GPIO GPIOA #define SDNAND_CS_PIN GPIO_Pin_4 #define SDNAND_CS_GPIO GPIOA // 初始化SDNAND的SPI接口 void SDNAND_SPI_Init(void) { SPI_InitTypeDef SPI_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; // 使能SDNAND的GPIO和SPI时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); RCC_APB2PeriphClockCmd(SDNAND_SPI_CLK, ENABLE); // 配置SDNAND的SPI接口引脚 GPIO_InitStructure.GPIO_Pin = SDNAND_SPI_SCK_PIN | SDNAND_SPI_MISO_PIN | SDNAND_SPI_MOSI_PIN; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_Init(SDNAND_SPI_SCK_GPIO, &GPIO_InitStructure); GPIO_Init(SDNAND_SPI_MISO_GPIO, &GPIO_InitStructure); GPIO_Init(SDNAND_SPI_MOSI_GPIO, &GPIO_InitStructure); // 配置SDNAND的片选引脚 GPIO_InitStructure.GPIO_Pin = SDNAND_CS_PIN; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_Init(SDNAND_CS_GPIO, &GPIO_InitStructure); // 初始化SDNAND的SPI接口 SPI_Cmd(SDNAND_SPI, DISABLE); SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; SPI_InitStructure.SPI_Mode = SPI_Mode_Master; SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low; SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge; SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16; SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; SPI_Init(SDNAND_SPI, &SPI_InitStructure); SPI_Cmd(SDNAND_SPI, ENABLE); }
发送指令:使用SPI总线向SDNAND发送指令,例如读取页、写入页、擦除块等操作。以下是STM32 MCU的发送指令代码示例:
// 发送指令 void SDNAND_SPI_SendCommand(uint8_t cmd) { GPIO_ResetBits(SDNAND_CS_GPIO, SDNAND_CS_PIN); SPI_I2S_SendData(SDNAND_SPI, cmd); while (SPI_I2S_GetFlagStatus(SDNAND_SPI, SPI_I2S_FLAG_BSY) == SET); GPIO_SetBits(SDNAND_CS_GPIO, SDNAND_CS_PIN); }
传输数据:在读取或写入页时,需要通过SPI总线传输数据。主机通过MOSI引脚向SDNAND发送数据,SDNAND通过MISO引脚向主机返回数据。以下是STM32 MCU的传输数据代码示例:
// 从SDNAND读取数据 void SDNAND_SPI_ReadData(uint8_t* pBuffer, uint32_t NumBytes) { GPIO_ResetBits(SDNAND_CS_GPIO, SDNAND_CS_PIN); while (NumBytes--) { SPI_I2S_SendData(SDNAND_SPI, 0xFF); while (SPI_I2S_GetFlagStatus(SDNAND_SPI, SPI_I2S_FLAG_BSY) == SET); *pBuffer++ = SPI_I2S_ReceiveData(SDNAND_SPI); } GPIO_SetBits(SDNAND_CS_GPIO, SDNAND_CS_PIN); } // 向SDNAND写入数据 void SDNAND_SPI_WriteData(const uint8_t* pBuffer, uint32_t NumBytes) { GPIO_ResetBits(SDNAND_CS_GPIO, SDNAND_CS_PIN); while (NumBytes--) { SPI_I2S_SendData(SDNAND_SPI, *pBuffer++); while (SPI_I2S_GetFlagStatus(SDNAND_SPI, SPI_I2S_FLAG_BSY) == SET); } GPIO_SetBits(SDNAND_CS_GPIO, SDNAND_CS_PIN); }
需要注意的是,以上代码示例仅供参考,具体的SDNAND和MCU型号、SPI模式、指令格式等可能有所不同,需要参考相应的数据手册来编写具体的代码。
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