STM32F7xx —— QSPI
目录
STM32F7xx —— QSPI
一、QSPI
二、几个重要的函数
三、几个重要的结构
四、QSPI接口设计（仅供参考）
五、QSPI驱动W25Q256
一、QSPI
SPI 是 Queued SPI 的简写，是 Motorola公司推出的 SPI 接口的扩展，比 SPI 应用更加广泛。在 SPI 协议的基础上，Motorola 公司对其功能进行了增强，增加了队列传输机制，推出了队列串行外围接口协议（即 QSPI 协议），使用该接口，用户可以一次性传输包含多达16个8位或16位数据的传输队列。一旦传输启动，直到传输结束，都不需要CPU干预，极大的提高了传输效率。该协议在ColdFire系列MCU得到广泛应用。与SPI相比，QSPI的最大结构特点是以80字节的RAM代替了SPI的发送和接收寄存器。QSPI 是一种专用的通信接口，连接单、双或四（条数据线） SPI Flash 存储介质。
该接口可以在以下三种模式下工作：
① 间接模式：使用 QSPI 寄存器执行全部操作
② 状态轮询模式：周期性读取外部 Flash 状态寄存器，而且标志位置 1 时会产生中断（如擦除或烧写完成，会产生中断）
③ 内存映射模式：外部 Flash 映射到微控制器地址空间，从而系统将其视作内部存储器。
QSPI通过6根线与SPI芯片通信，下图是内部框图：
QSPI每条命令，必须包含一个或多个阶段：指令、地址、交替字节、空指令和数据。
QSPI发送命令：等待QSPI空闲；设置命令参数。
QSPI读数据：设置数据传输长度；设置QSPI工作模式并设置地址；读取数据。
QSPI写数据：设置数据传输长度；设置QSPI工作模式并设置地址；写数据。
二、几个重要的函数
HAL_StatusTypeDef HAL_QSPI_Init (QSPI_HandleTypeDef *hqspi); // 初始化HAL_StatusTypeDef HAL_QSPI_Command(QSPI_HandleTypeDef *hqspi, QSPI_CommandTypeDef *cmd, uint32_t Timeout); // 发送命令HAL_StatusTypeDef HAL_QSPI_Transmit (QSPI_HandleTypeDef *hqspi, uint8_t *pData, uint32_t Timeout); // 发送数据HAL_StatusTypeDef HAL_QSPI_Receive (QSPI_HandleTypeDef *hqspi, uint8_t *pData, uint32_t Timeout); // 接收数据三、几个重要的结构
// QSPI操作句柄
typedef struct
{QUADSPI_TypeDef *Instance; /* QSPI registers base address */QSPI_InitTypeDef Init; /* QSPI communication parameters */uint8_t *pTxBuffPtr; /* Pointer to QSPI Tx transfer Buffer */__IO uint16_t TxXferSize; /* QSPI Tx Transfer size */__IO uint16_t TxXferCount; /* QSPI Tx Transfer Counter */uint8_t *pRxBuffPtr; /* Pointer to QSPI Rx transfer Buffer */__IO uint16_t RxXferSize; /* QSPI Rx Transfer size */__IO uint16_t RxXferCount; /* QSPI Rx Transfer Counter */DMA_HandleTypeDef *hdma; /* QSPI Rx/Tx DMA Handle parameters */__IO HAL_LockTypeDef Lock; /* Locking object */__IO HAL_QSPI_StateTypeDef State; /* QSPI communication state */__IO uint32_t ErrorCode; /* QSPI Error code */uint32_t Timeout; /* Timeout for the QSPI memory access */
}QSPI_HandleTypeDef;// Instance：QSPI基地址 --- QUADSPI
// Init：设置QSPI参数
// pTxBuffPtr,TxXferSize,TxXferCount：发送缓存指针 发送数据量 剩余数据量
// pRxBuffPtr,RxXferSize,RxXferCount：接收缓存指针 发送数据量 剩余数据量
// hdma与DMA相关， 其他为过程变量不需要关心// 参数配置 时钟分频系数 FIFO阈值 采样移位 FLASH大小 片选高电平时间 时钟模式 闪存ID 双闪存模式设置
typedef struct
{uint32_t ClockPrescaler; /* Specifies the prescaler factor for generating clock based on the AHB clock.This parameter can be a number between 0 and 255 */ uint32_t FifoThreshold; /* Specifies the threshold number of bytes in the FIFO (used only in indirect mode)This parameter can be a value between 1 and 32 */uint32_t SampleShifting; /* Specifies the Sample Shift. The data is sampled 1/2 clock cycle delay later to take in account external signal delays. (It should be QSPI_SAMPLE_SHIFTING_NONE in DDR mode)This parameter can be a value of @ref QSPI_SampleShifting */uint32_t FlashSize; /* Specifies the Flash Size. FlashSize+1 is effectively the number of address bits required to address the flash memory. The flash capacity can be up to 4GB (addressed using 32 bits) in indirect mode, but the addressable space in memory-mapped mode is limited to 256MBThis parameter can be a number between 0 and 31 */uint32_t ChipSelectHighTime; /* Specifies the Chip Select High Time. ChipSelectHighTime+1 defines the minimum number of clock cycles which the chip select must remain high between commands.This parameter can be a value of @ref QSPI_ChipSelectHighTime */ uint32_t ClockMode; /* Specifies the Clock Mode. It indicates the level that clock takes between commands.This parameter can be a value of @ref QSPI_ClockMode */uint32_t FlashID; /* Specifies the Flash which will be used,This parameter can be a value of @ref QSPI_Flash_Select */uint32_t DualFlash; /* Specifies the Dual Flash Mode StateThis parameter can be a value of @ref QSPI_DualFlash_Mode */
}QSPI_InitTypeDef;// 采样移位
#define QSPI_SAMPLE_SHIFTING_NONE ((uint32_t)0x00000000U) /*!<No clock cycle shift to sample data*/
#define QSPI_SAMPLE_SHIFTING_HALFCYCLE ((uint32_t)QUADSPI_CR_SSHIFT) /*!<1/2 clock cycle shift to sample data*/
四、QSPI接口设计（仅供参考）
#define QSPI_CLK_ENABLE() __HAL_RCC_QSPI_CLK_ENABLE();#define QSPI_BK1_NCS_PORT GPIOB
#define QSPI_BK1_NCS_PIN GPIO_PIN_6
#define QSPI_BK1_NCS_AF GPIO_AF10_QUADSPI
#define QSPI_BK1_NCS_CONFIG() GPIOConfigExt(QSPI_BK1_NCS_PORT, QSPI_BK1_NCS_PIN, GPIO_MODE_AF_PP, GPIO_PULLUP, QSPI_BK1_NCS_AF)#define QSPI_BK1_CLK_PORT GPIOB
#define QSPI_BK1_CLK_PIN GPIO_PIN_2
#define QSPI_BK1_CLK_AF GPIO_AF9_QUADSPI
#define QSPI_BK1_CLK_CONFIG() GPIOConfigExt(QSPI_BK1_CLK_PORT, QSPI_BK1_CLK_PIN, GPIO_MODE_AF_PP, GPIO_NOPULL, QSPI_BK1_CLK_AF)#define QSPI_BK1_IO0_PORT GPIOF
#define QSPI_BK1_IO0_PIN GPIO_PIN_8
#define QSPI_BK1_IO0_AF GPIO_AF10_QUADSPI
#define QSPI_BK1_IO0_CONFIG() GPIOConfigExt(QSPI_BK1_IO0_PORT, QSPI_BK1_IO0_PIN, GPIO_MODE_AF_PP, GPIO_NOPULL, QSPI_BK1_IO0_AF)#define QSPI_BK1_IO1_PORT GPIOF
#define QSPI_BK1_IO1_PIN GPIO_PIN_9
#define QSPI_BK1_IO1_AF GPIO_AF10_QUADSPI
#define QSPI_BK1_IO1_CONFIG() GPIOConfigExt(QSPI_BK1_IO1_PORT, QSPI_BK1_IO1_PIN, GPIO_MODE_AF_PP, GPIO_NOPULL, QSPI_BK1_IO1_AF)#define QSPI_BK1_IO2_PORT GPIOF
#define QSPI_BK1_IO2_PIN GPIO_PIN_7
#define QSPI_BK1_IO2_AF GPIO_AF9_QUADSPI
#define QSPI_BK1_IO2_CONFIG() GPIOConfigExt(QSPI_BK1_IO2_PORT, QSPI_BK1_IO2_PIN, GPIO_MODE_AF_PP, GPIO_NOPULL, QSPI_BK1_IO2_AF)#define QSPI_BK1_IO3_PORT GPIOF
#define QSPI_BK1_IO3_PIN GPIO_PIN_6
#define QSPI_BK1_IO3_AF GPIO_AF9_QUADSPI
#define QSPI_BK1_IO3_CONFIG() GPIOConfigExt(QSPI_BK1_IO3_PORT, QSPI_BK1_IO3_PIN, GPIO_MODE_AF_PP, GPIO_NOPULL, QSPI_BK1_IO3_AF)
// 封装几个必要的接口
static QSPI_HandleTypeDef qspi_handle;static void qspi_gpio_init(void)
{QSPI_CLK_ENABLE();QSPI_BK1_NCS_CONFIG();QSPI_BK1_CLK_CONFIG();QSPI_BK1_IO0_CONFIG();QSPI_BK1_IO1_CONFIG();QSPI_BK1_IO2_CONFIG();QSPI_BK1_IO3_CONFIG();
}static void qspi_mode_init(void)
{qspi_handle.Instance = QUADSPI; // QSPIqspi_handle.Init.ClockPrescaler = 2; // QPSI分频比，W25Q256最大频率为104M 所以此处应该为2，QSPI频率就为216/(2+1)=72MHZqspi_handle.Init.FifoThreshold = 4; // FIFO阈值为4个字节qspi_handle.Init.SampleShifting = QSPI_SAMPLE_SHIFTING_HALFCYCLE; // 采样移位半个周期(DDR模式下,必须设置为0)qspi_handle.Init.FlashSize = POSITION_VAL(0X2000000) - 1; // SPI FLASH大小，W25Q256大小为32M字节qspi_handle.Init.ChipSelectHighTime = QSPI_CS_HIGH_TIME_4_CYCLE; // 片选高电平时间为4个时钟(13.8*4=55.2ns),即手册里面的tSHSL参数qspi_handle.Init.ClockMode = QSPI_CLOCK_MODE_0; // 模式0qspi_handle.Init.FlashID = QSPI_FLASH_ID_1; // 第一片flashqspi_handle.Init.DualFlash = QSPI_DUALFLASH_DISABLE; // 禁止双闪存模式HAL_QSPI_Init(&qspi_handle); //QSPI初始化
}void QSPIInit(void)
{qspi_gpio_init();qspi_mode_init();
}// QSPI发送命令
// instruction:要发送的指令
// address:发送到的目的地址
// dummyCycles:空指令周期数
// instructionMode:指令模式;QSPI_INSTRUCTION_NONE,QSPI_INSTRUCTION_1_LINE,QSPI_INSTRUCTION_2_LINE,QSPI_INSTRUCTION_4_LINE
// addressMode:地址模式; QSPI_ADDRESS_NONE,QSPI_ADDRESS_1_LINE,QSPI_ADDRESS_2_LINE,QSPI_ADDRESS_4_LINE
// addressSize:地址长度;QSPI_ADDRESS_8_BITS,QSPI_ADDRESS_16_BITS,QSPI_ADDRESS_24_BITS,QSPI_ADDRESS_32_BITS
// dataMode:数据模式; QSPI_DATA_NONE,QSPI_DATA_1_LINE,QSPI_DATA_2_LINE,QSPI_DATA_4_LINE
void QSPISendCMD(uint32_t instruction, uint32_t address, uint32_t dummyCycles, uint32_t instructionMode, uint32_t addressMode, uint32_t addressSize, uint32_t dataMode)
{QSPI_CommandTypeDef Cmdhandler;Cmdhandler.Instruction = instruction; // 指令Cmdhandler.Address = address; // 地址Cmdhandler.DummyCycles = dummyCycles; // 设置空指令周期数Cmdhandler.InstructionMode = instructionMode; // 指令模式Cmdhandler.AddressMode = addressMode; // 地址模式Cmdhandler.AddressSize = addressSize; // 地址长度Cmdhandler.DataMode = dataMode; // 数据模式Cmdhandler.SIOOMode = QSPI_SIOO_INST_EVERY_CMD; // 每次都发送指令Cmdhandler.AlternateByteMode = QSPI_ALTERNATE_BYTES_NONE; // 无交替字节Cmdhandler.DdrMode = QSPI_DDR_MODE_DISABLE; // 关闭DDR模式Cmdhandler.DdrHoldHalfCycle = QSPI_DDR_HHC_ANALOG_DELAY;HAL_QSPI_Command(&qspi_handle, &Cmdhandler, 5000);
}// 接收指定长度数据
uint8_t QSPIReceive(uint8_t *buffer, uint32_t length)
{qspi_handle.Instance->DLR = length - 1;if(HAL_QSPI_Receive(&qspi_handle, buffer, 5000) == HAL_OK){return 0; //接收数据}else{return 1;}
}// 发送指定长度数据
uint8_t QSPITransmit(uint8_t *buffer, uint32_t length)
{qspi_handle.Instance->DLR = length - 1;if(HAL_QSPI_Transmit(&qspi_handle, buffer, 5000) == HAL_OK){return 0; //发送数据}else{return 1;}
}五、QSPI驱动W25Q256
W25Q256:32M 512块，每块16个扇区，每个扇区4K。具体指令看手册。封装了如下接口（初始化读写擦除等接口是以后移植文件系统的基础）：
#define W25QXX_WRITE_ENABLE 0x06
#define W25QXX_WRITE_DISABLE 0x04
#define W25QXX_READ_STATUS_REG1 0x05
#define W25QXX_READ_STATUS_REG2 0x35
#define W25QXX_READ_STATUS_REG3 0x15
#define W25QXX_WRITE_STATUS_REG1 0x01
#define W25QXX_WRITE_STATUS_REG2 0x31
#define W25QXX_WRITE_STATUS_REG3 0x11
#define W25QXX_READ_DATA 0x03
#define W25QXX_FAST_READ_DATA 0x0B
#define W25QXX_FAST_READ_DUAL 0x3B
#define W25QXX_PAGE_PROGRAM 0x02
#define W25QXX_BLOCK_ERASE 0xD8
#define W25QXX_SECTOR_ERASE 0x20
#define W25QXX_CHIP_ERASE 0xC7
#define W25QXX_DEVICEID 0xAB
#define W25QXX_MANUFACT_DEVICEID 0x90
#define W25QXX_JEDEC_DEVICEID 0x9F
#define W25QXX_EABLE_4BYTE_ADDR 0xB7
#define W25QXX_EXIT_4BYTE_ADDR 0xE9
#define W25QXX_SET_READ_PARAM 0xC0
#define W25QXX_ENTER_QPIMODE 0x38
#define W25QXX_EXIT_QPIMODE 0xFFuint8_t w25qxx_qpi_mode = 0; // QSPI模式标志:0,SPI模式;1,QPI模式.// 读取W25QXX的状态寄存器，W25QXX一共有3个状态寄存器
// 状态寄存器1：
// BIT7 6 5 4 3 2 1 0
// SPR RV TB BP2 BP1 BP0 WEL BUSY
// SPR:默认0,状态寄存器保护位,配合WP使用
// TB,BP2,BP1,BP0:FLASH区域写保护设置
// WEL:写使能锁定
// BUSY:忙标记位(1,忙;0,空闲)
// 默认:0x00
// 状态寄存器2：
// BIT7 6 5 4 3 2 1 0
// SUS CMP LB3 LB2 LB1 (R) QE SRP1
// 状态寄存器3：
// BIT7 6 5 4 3 2 1 0
// HOLD/RST DRV1 DRV0 (R) (R) WPS ADP ADS
// reg:状态寄存器号，范:1~3
// 返回值:状态寄存器值
static uint8_t w25qxx_read_status(uint8_t reg)
{uint8_t value = 0, command = 0;switch(reg){case 1:command = W25QXX_READ_STATUS_REG1; // 读状态寄存器1指令break;case 2:command = W25QXX_READ_STATUS_REG2; // 读状态寄存器2指令break;case 3:command = W25QXX_READ_STATUS_REG3; // 读状态寄存器3指令break;default:command = W25QXX_READ_STATUS_REG1;break;}if(w25qxx_qpi_mode){QSPISendCMD(command, 0, 0, QSPI_INSTRUCTION_4_LINES, QSPI_ADDRESS_NONE, QSPI_ADDRESS_8_BITS, QSPI_DATA_4_LINES); //QPI,写command指令,地址为0,4线传数据_8位地址_无地址_4线传输指令,无空周期,1个字节数据}else{QSPISendCMD(command, 0, 0, QSPI_INSTRUCTION_1_LINE, QSPI_ADDRESS_NONE, QSPI_ADDRESS_8_BITS, QSPI_DATA_1_LINE); //SPI,写command指令,地址为0,单线传数据_8位地址_无地址_单线传输指令,无空周期,1个字节数据}QSPIReceive(&value, 1);return value;
}// 写状态寄存器
static void w25qxx_write_status(uint8_t reg, uint8_t status)
{uint8_t command = 0;switch(reg){case 1:command = W25QXX_WRITE_STATUS_REG1; //写状态寄存器1指令break;case 2:command = W25QXX_WRITE_STATUS_REG2; //写状态寄存器2指令break;case 3:command = W25QXX_WRITE_STATUS_REG3; //写状态寄存器3指令break;default:command = W25QXX_WRITE_STATUS_REG1;break;}if(w25qxx_qpi_mode){QSPISendCMD(command, 0, 0, QSPI_INSTRUCTION_4_LINES, QSPI_ADDRESS_NONE, QSPI_ADDRESS_8_BITS, QSPI_DATA_4_LINES); // QPI,写command指令,地址为0,4线传数据_8位地址_无地址_4线传输指令,无空周期,1个字节数据}else{QSPISendCMD(command, 0, 0, QSPI_INSTRUCTION_1_LINE, QSPI_ADDRESS_NONE, QSPI_ADDRESS_8_BITS, QSPI_DATA_1_LINE); // SPI,写command指令,地址为0,单线传数据_8位地址_无地址_单线传输指令,无空周期,1个字节数据}QSPITransmit(&status, sizeof(status));
}// 写使能 将S1寄存器的WEL置位
static void w25qxx_write_enable(void)
{if(w25qxx_qpi_mode){QSPISendCMD(W25QXX_WRITE_ENABLE, 0, 0, QSPI_INSTRUCTION_4_LINES, QSPI_ADDRESS_NONE, QSPI_ADDRESS_8_BITS, QSPI_DATA_NONE); // QPI,写使能指令,地址为0,无数据_8位地址_无地址_4线传输指令,无空周期,0个字节数据}else{QSPISendCMD(W25QXX_WRITE_ENABLE, 0, 0, QSPI_INSTRUCTION_1_LINE, QSPI_ADDRESS_NONE, QSPI_ADDRESS_8_BITS, QSPI_DATA_NONE); // SPI,写使能指令,地址为0,无数据_8位地址_无地址_单线传输指令,无空周期,0个字节数据}
}// 写失能 将WEL清零
void W25QXX_Write_Disable(void)
{if(w25qxx_qpi_mode){QSPISendCMD(W25QXX_WRITE_DISABLE, 0, 0, QSPI_INSTRUCTION_4_LINES, QSPI_ADDRESS_NONE, QSPI_ADDRESS_8_BITS, QSPI_DATA_NONE); // QPI,写禁止指令,地址为0,无数据_8位地址_无地址_4线传输指令,无空周期,0个字节数据}else{QSPISendCMD(W25QXX_WRITE_DISABLE, 0, 0, QSPI_INSTRUCTION_1_LINE, QSPI_ADDRESS_NONE, QSPI_ADDRESS_8_BITS, QSPI_DATA_NONE); // SPI,写禁止指令,地址为0,无数据_8位地址_无地址_单线传输指令,无空周期,0个字节数据}
}// 等待空闲
void w25qxx_wait_busy(void)
{while((w25qxx_read_status(1) & 0x01) == 0x01); // 等待BUSY位清空
}// W25QXX进入QSPI模式
static void w25qxx_qspi_init(void)
{uint8_t reg2;reg2 = w25qxx_read_status(2); // 先读出状态寄存器2的原始值if((reg2 & 0X02) == 0) // QE位未使能{w25qxx_write_enable(); // 写使能reg2 |= 1 << 1; // 使能QE位w25qxx_write_status(2, reg2); // 写状态寄存器2}QSPISendCMD(W25QXX_ENTER_QPIMODE, 0, 0, QSPI_INSTRUCTION_1_LINE, QSPI_ADDRESS_NONE, QSPI_ADDRESS_8_BITS, QSPI_DATA_NONE); // 写command指令,地址为0,无数据_8位地址_无地址_单线传输指令,无空周期,0个字节数据w25qxx_qpi_mode = 1; // 标记QSPI模式
}// 0XEF13,表示芯片型号为W25Q80
// 0XEF14,表示芯片型号为W25Q16
// 0XEF15,表示芯片型号为W25Q32
// 0XEF16,表示芯片型号为W25Q64
// 0XEF17,表示芯片型号为W25Q128
// 0XEF18,表示芯片型号为W25Q256
static void w25qxx_id_get(void)
{uint8_t temp[2];uint16_t device_id;if(w25qxx_qpi_mode){QSPISendCMD(W25QXX_MANUFACT_DEVICEID, 0, 0, QSPI_INSTRUCTION_4_LINES, QSPI_ADDRESS_4_LINES, QSPI_ADDRESS_24_BITS, QSPI_DATA_4_LINES); // QPI,读id,地址为0,4线传输数据_24位地址_4线传输地址_4线传输指令,无空周期,2个字节数据}else{QSPISendCMD(W25QXX_MANUFACT_DEVICEID, 0, 0, QSPI_INSTRUCTION_1_LINE, QSPI_ADDRESS_1_LINE, QSPI_ADDRESS_24_BITS, QSPI_DATA_1_LINE); // SPI,读id,地址为0,单线传输数据_24位地址_单线传输地址_单线传输指令,无空周期,2个字节数据}QSPIReceive(temp, 2);device_id = (temp[0] << 8) | temp[1];printf("QSPI Flash Device ID: %X\r\n", device_id);
}void W25QXXInit(void)
{uint8_t temp;QSPIInit();w25qxx_qspi_init(); // 使能QSPI模式w25qxx_id_get(); // 读取FLASH ID.temp = w25qxx_read_status(3); // 读取状态寄存器3，判断地址模式if((temp & 0X01) == 0) // 如果不是4字节地址模式,则进入4字节地址模式{w25qxx_write_enable(); // 写使能QSPISendCMD(W25QXX_EABLE_4BYTE_ADDR, 0, 0, QSPI_INSTRUCTION_4_LINES, QSPI_ADDRESS_NONE, QSPI_ADDRESS_8_BITS, QSPI_DATA_NONE); // QPI,使能4字节地址指令,地址为0,无数据_8位地址_无地址_4线传输指令,无空周期,0个字节数据}w25qxx_write_enable(); // 写使能QSPISendCMD(W25QXX_SET_READ_PARAM, 0, 0, QSPI_INSTRUCTION_4_LINES, QSPI_ADDRESS_NONE, QSPI_ADDRESS_8_BITS, QSPI_DATA_4_LINES); // QPI,设置读参数指令,地址为0,4线传数据_8位地址_无地址_4线传输指令,无空周期,1个字节数据temp = 3 << 4; // 设置P4&P5=11,8个dummy clocks,104MQSPITransmit(&temp, 1);
}// 擦除一块4096字节 最少需要150ms
void W25QXXSectorErase(uint32_t addr)
{//addr /= 4096;addr *= 4096;w25qxx_write_enable();w25qxx_wait_busy();QSPISendCMD(W25QXX_SECTOR_ERASE, addr, 0, QSPI_INSTRUCTION_4_LINES, QSPI_ADDRESS_4_LINES, QSPI_ADDRESS_32_BITS, QSPI_DATA_NONE); // QPI,写扇区擦除指令,地址为0,无数据_32位地址_4线传输地址_4线传输指令,无空周期,0个字节数据w25qxx_wait_busy();
}// 擦除整个芯片
void W25QXXChipErase(void)
{w25qxx_write_enable(); //SET WELw25qxx_wait_busy();QSPISendCMD(W25QXX_CHIP_ERASE, 0, 0, QSPI_INSTRUCTION_4_LINES, QSPI_ADDRESS_NONE, QSPI_ADDRESS_8_BITS, QSPI_DATA_NONE); // QPI,写全片擦除指令,地址为0,无数据_8位地址_无地址_4线传输指令,无空周期,0个字节数据w25qxx_wait_busy(); //等待芯片擦除结束
}// 写最多256字节
void W25QXXWritePage(uint32_t addr, uint8_t *buffer, uint16_t length)
{w25qxx_write_enable(); //写使能QSPISendCMD(W25QXX_PAGE_PROGRAM, addr, 0, QSPI_INSTRUCTION_4_LINES, QSPI_ADDRESS_4_LINES, QSPI_ADDRESS_32_BITS, QSPI_DATA_4_LINES); // QPI,页写指令,地址为WriteAddr,4线传输数据_32位地址_4线传输地址_4线传输指令,无空周期,NumByteToWrite个数据QSPITransmit(buffer, length);w25qxx_wait_busy(); //等待写入结束
}// 写最多65536字节 无擦除动作
void W25QXXWriteExt(uint32_t addr, uint8_t *buffer, uint16_t length)
{uint16_t pageremain = 256 - addr % 256; // 单页剩余的字节数if(addr + length - 1 > (32 * 1024 * 1024)){return;}if(length <= pageremain){pageremain = length; // 不大于256个字节}while(1){// 分页写入W25QXXWritePage(addr, buffer, pageremain);if(length == pageremain){break; //写入结束了}else{buffer += pageremain;addr += pageremain;length -= pageremain; // 减去已经写入了的字节数if(length > 256){pageremain = 256; // 一次可以写入256个字节}else{pageremain = length; // 不够256个字节了}}}
}// 写最多65536字节 带擦除动作
static uint8_t W25QXX_BUFFER[4096];
void W25QXXWrite(uint32_t addr, uint8_t* buffer, uint16_t length)
{uint32_t secpos;uint16_t secoff, secremain, i;uint8_t * w25q_buf;w25q_buf = W25QXX_BUFFER;secpos = addr / 4096; // 扇区地址secoff = addr % 4096; // 在扇区内的偏移secremain = 4096 - secoff; // 扇区剩余空间大小if(length <= secremain){secremain = length; // 不大于4096个字节}while(1){WatchdogFeed();W25QXXRead(secpos * 4096, w25q_buf, 4096); // 读出整个扇区的内容for(i = 0; i < secremain; ++i){if(w25q_buf[secoff + i] != 0XFF){break; // 需要擦除}}if(i < secremain) // 需要擦除{W25QXXSectorErase(secpos); // 擦除这个扇区for(i = 0; i < secremain; ++i){w25q_buf[i + secoff] = buffer[i];}W25QXXWriteExt(secpos * 4096, w25q_buf, 4096); // 写入整个扇区}else{W25QXXWriteExt(addr, buffer, secremain); // 写已经擦除了的,直接写入扇区剩余区间.}if(length == secremain){break;}else{secpos++;secoff = 0;buffer += secremain;addr += secremain;length -= secremain;if(length > 4096){secremain = 4096;}else{secremain = length;}}};
}// 读取SPI FLASH,仅支持QPI模式 在指定地址开始读取指定长度的数据 65536
void W25QXXRead(uint32_t addr, uint8_t *buffer, uint16_t length)
{QSPISendCMD(W25QXX_FAST_READ_DATA, addr, 8, QSPI_INSTRUCTION_4_LINES, QSPI_ADDRESS_4_LINES, QSPI_ADDRESS_32_BITS, QSPI_DATA_4_LINES); // QPI,快速读数据,地址为ReadAddr,4线传输数据_32位地址_4线传输地址_4线传输指令,8空周期,length个数据QSPIReceive(buffer, length);
}也可以使用SPI操作W25QXX。
