STM32F7xx —— QSPI
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STM32F7xx —— QSPI
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? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?STM32F7xx —— QSPI
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目錄
STM32F7xx —— QSPI
一、QSPI
二、幾個重要的函數
三、幾個重要的結構
四、QSPI接口設計（僅供參考）
五、QSPI驅動W25Q256
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一、QSPI
? ? ? ? SPI 是 Queued SPI 的簡寫，是 Motorola公司推出的 SPI 接口的擴展，比 SPI 應用更加廣泛。在 SPI 協議的基礎上，Motorola 公司對其功能進行了增強，增加了隊列傳輸機制，推出了隊列串行外圍接口協議（即 QSPI 協議），使用該接口，用戶可以一次性傳輸包含多達16個8位或16位數據的傳輸隊列。一旦傳輸啟動，直到傳輸結束，都不需要CPU干預，極大的提高了傳輸效率。該協議在ColdFire系列MCU得到廣泛應用。與SPI相比，QSPI的最大結構特點是以80字節的RAM代替了SPI的發送和接收寄存器。QSPI 是一種專用的通信接口，連接單、雙或四（條數據線） SPI Flash 存儲介質。
?該接口可以在以下三種模式下工作：
① 間接模式：使用 QSPI 寄存器執行全部操作
② 狀態輪詢模式：周期性讀取外部 Flash 狀態寄存器，而且標志位置 1 時會產生中斷（如擦除或燒寫完成，會產生中斷）
③ 內存映射模式：外部 Flash 映射到微控制器地址空間，從而系統將其視作內部存儲器。
QSPI通過6根線與SPI芯片通信，下圖是內部框圖：
QSPI每條命令，必須包含一個或多個階段：指令、地址、交替字節、空指令和數據。
QSPI發送命令：等待QSPI空閑；設置命令參數。
QSPI讀數據：設置數據傳輸長度；設置QSPI工作模式并設置地址；讀取數據。
QSPI寫數據：設置數據傳輸長度；設置QSPI工作模式并設置地址；寫數據。
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二、幾個重要的函數
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); // 發送命令HAL_StatusTypeDef HAL_QSPI_Transmit (QSPI_HandleTypeDef *hqspi, uint8_t *pData, uint32_t Timeout); // 發送數據HAL_StatusTypeDef HAL_QSPI_Receive (QSPI_HandleTypeDef *hqspi, uint8_t *pData, uint32_t Timeout); // 接收數據三、幾個重要的結構
// 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：設置QSPI參數 // pTxBuffPtr,TxXferSize,TxXferCount：發送緩存指針 發送數據量 剩余數據量 // pRxBuffPtr,RxXferSize,RxXferCount：接收緩存指針 發送數據量 剩余數據量 // hdma與DMA相關， 其他為過程變量不需要關心 // 參數配置 時鐘分頻系數 FIFO閾值 采樣移位 FLASH大小 片選高電平時間 時鐘模式 閃存ID 雙閃存模式設置 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; // 采樣移位 #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接口設計（僅供參考）
#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) // 封裝幾個必要的接口 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分頻比，W25Q256最大頻率為104M 所以此處應該為2，QSPI頻率就為216/(2+1)=72MHZqspi_handle.Init.FifoThreshold = 4; // FIFO閾值為4個字節qspi_handle.Init.SampleShifting = QSPI_SAMPLE_SHIFTING_HALFCYCLE; // 采樣移位半個周期(DDR模式下,必須設置為0)qspi_handle.Init.FlashSize = POSITION_VAL(0X2000000) - 1; // SPI FLASH大小，W25Q256大小為32M字節qspi_handle.Init.ChipSelectHighTime = QSPI_CS_HIGH_TIME_4_CYCLE; // 片選高電平時間為4個時鐘(13.8*4=55.2ns),即手冊里面的tSHSL參數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; // 禁止雙閃存模式HAL_QSPI_Init(&qspi_handle); //QSPI初始化 }void QSPIInit(void) {qspi_gpio_init();qspi_mode_init(); }// QSPI發送命令 // instruction:要發送的指令 // address:發送到的目的地址 // dummyCycles:空指令周期數 // 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:地址長度;QSPI_ADDRESS_8_BITS,QSPI_ADDRESS_16_BITS,QSPI_ADDRESS_24_BITS,QSPI_ADDRESS_32_BITS // dataMode:數據模式; 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; // 設置空指令周期數Cmdhandler.InstructionMode = instructionMode; // 指令模式Cmdhandler.AddressMode = addressMode; // 地址模式Cmdhandler.AddressSize = addressSize; // 地址長度Cmdhandler.DataMode = dataMode; // 數據模式Cmdhandler.SIOOMode = QSPI_SIOO_INST_EVERY_CMD; // 每次都發送指令Cmdhandler.AlternateByteMode = QSPI_ALTERNATE_BYTES_NONE; // 無交替字節Cmdhandler.DdrMode = QSPI_DDR_MODE_DISABLE; // 關閉DDR模式Cmdhandler.DdrHoldHalfCycle = QSPI_DDR_HHC_ANALOG_DELAY;HAL_QSPI_Command(&qspi_handle, &Cmdhandler, 5000); }// 接收指定長度數據 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; //接收數據}else{return 1;} }// 發送指定長度數據 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; //發送數據}else{return 1;} }五、QSPI驅動W25Q256
W25Q256:32M? 512塊，每塊16個扇區，每個扇區4K。具體指令看手冊。封裝了如下接口（初始化讀寫擦除等接口是以后移植文件系統的基礎）：
#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模式標志:0,SPI模式;1,QPI模式.// 讀取W25QXX的狀態寄存器，W25QXX一共有3個狀態寄存器 // 狀態寄存器1： // BIT7 6 5 4 3 2 1 0 // SPR RV TB BP2 BP1 BP0 WEL BUSY // SPR:默認0,狀態寄存器保護位,配合WP使用 // TB,BP2,BP1,BP0:FLASH區域寫保護設置 // WEL:寫使能鎖定 // BUSY:忙標記位(1,忙;0,空閑) // 默認:0x00 // 狀態寄存器2： // BIT7 6 5 4 3 2 1 0 // SUS CMP LB3 LB2 LB1 (R) QE SRP1 // 狀態寄存器3： // BIT7 6 5 4 3 2 1 0 // HOLD/RST DRV1 DRV0 (R) (R) WPS ADP ADS // reg:狀態寄存器號，范:1~3 // 返回值:狀態寄存器值 static uint8_t w25qxx_read_status(uint8_t reg) {uint8_t value = 0, command = 0;switch(reg){case 1:command = W25QXX_READ_STATUS_REG1; // 讀狀態寄存器1指令break;case 2:command = W25QXX_READ_STATUS_REG2; // 讀狀態寄存器2指令break;case 3:command = W25QXX_READ_STATUS_REG3; // 讀狀態寄存器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,寫command指令,地址為0,4線傳數據_8位地址_無地址_4線傳輸指令,無空周期,1個字節數據}else{QSPISendCMD(command, 0, 0, QSPI_INSTRUCTION_1_LINE, QSPI_ADDRESS_NONE, QSPI_ADDRESS_8_BITS, QSPI_DATA_1_LINE); //SPI,寫command指令,地址為0,單線傳數據_8位地址_無地址_單線傳輸指令,無空周期,1個字節數據}QSPIReceive(&value, 1);return value; }// 寫狀態寄存器 static void w25qxx_write_status(uint8_t reg, uint8_t status) {uint8_t command = 0;switch(reg){case 1:command = W25QXX_WRITE_STATUS_REG1; //寫狀態寄存器1指令break;case 2:command = W25QXX_WRITE_STATUS_REG2; //寫狀態寄存器2指令break;case 3:command = W25QXX_WRITE_STATUS_REG3; //寫狀態寄存器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,寫command指令,地址為0,4線傳數據_8位地址_無地址_4線傳輸指令,無空周期,1個字節數據}else{QSPISendCMD(command, 0, 0, QSPI_INSTRUCTION_1_LINE, QSPI_ADDRESS_NONE, QSPI_ADDRESS_8_BITS, QSPI_DATA_1_LINE); // SPI,寫command指令,地址為0,單線傳數據_8位地址_無地址_單線傳輸指令,無空周期,1個字節數據}QSPITransmit(&status, sizeof(status)); }// 寫使能 將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,寫使能指令,地址為0,無數據_8位地址_無地址_4線傳輸指令,無空周期,0個字節數據}else{QSPISendCMD(W25QXX_WRITE_ENABLE, 0, 0, QSPI_INSTRUCTION_1_LINE, QSPI_ADDRESS_NONE, QSPI_ADDRESS_8_BITS, QSPI_DATA_NONE); // SPI,寫使能指令,地址為0,無數據_8位地址_無地址_單線傳輸指令,無空周期,0個字節數據} }// 寫失能 將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,寫禁止指令,地址為0,無數據_8位地址_無地址_4線傳輸指令,無空周期,0個字節數據}else{QSPISendCMD(W25QXX_WRITE_DISABLE, 0, 0, QSPI_INSTRUCTION_1_LINE, QSPI_ADDRESS_NONE, QSPI_ADDRESS_8_BITS, QSPI_DATA_NONE); // SPI,寫禁止指令,地址為0,無數據_8位地址_無地址_單線傳輸指令,無空周期,0個字節數據} }// 等待空閑 void w25qxx_wait_busy(void) {while((w25qxx_read_status(1) & 0x01) == 0x01); // 等待BUSY位清空 }// W25QXX進入QSPI模式 static void w25qxx_qspi_init(void) {uint8_t reg2;reg2 = w25qxx_read_status(2); // 先讀出狀態寄存器2的原始值if((reg2 & 0X02) == 0) // QE位未使能{w25qxx_write_enable(); // 寫使能reg2 |= 1 << 1; // 使能QE位w25qxx_write_status(2, reg2); // 寫狀態寄存器2}QSPISendCMD(W25QXX_ENTER_QPIMODE, 0, 0, QSPI_INSTRUCTION_1_LINE, QSPI_ADDRESS_NONE, QSPI_ADDRESS_8_BITS, QSPI_DATA_NONE); // 寫command指令,地址為0,無數據_8位地址_無地址_單線傳輸指令,無空周期,0個字節數據w25qxx_qpi_mode = 1; // 標記QSPI模式 }// 0XEF13,表示芯片型號為W25Q80 // 0XEF14,表示芯片型號為W25Q16 // 0XEF15,表示芯片型號為W25Q32 // 0XEF16,表示芯片型號為W25Q64 // 0XEF17,表示芯片型號為W25Q128 // 0XEF18,表示芯片型號為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,讀id,地址為0,4線傳輸數據_24位地址_4線傳輸地址_4線傳輸指令,無空周期,2個字節數據}else{QSPISendCMD(W25QXX_MANUFACT_DEVICEID, 0, 0, QSPI_INSTRUCTION_1_LINE, QSPI_ADDRESS_1_LINE, QSPI_ADDRESS_24_BITS, QSPI_DATA_1_LINE); // SPI,讀id,地址為0,單線傳輸數據_24位地址_單線傳輸地址_單線傳輸指令,無空周期,2個字節數據}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(); // 讀取FLASH ID.temp = w25qxx_read_status(3); // 讀取狀態寄存器3，判斷地址模式if((temp & 0X01) == 0) // 如果不是4字節地址模式,則進入4字節地址模式{w25qxx_write_enable(); // 寫使能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字節地址指令,地址為0,無數據_8位地址_無地址_4線傳輸指令,無空周期,0個字節數據}w25qxx_write_enable(); // 寫使能QSPISendCMD(W25QXX_SET_READ_PARAM, 0, 0, QSPI_INSTRUCTION_4_LINES, QSPI_ADDRESS_NONE, QSPI_ADDRESS_8_BITS, QSPI_DATA_4_LINES); // QPI,設置讀參數指令,地址為0,4線傳數據_8位地址_無地址_4線傳輸指令,無空周期,1個字節數據temp = 3 << 4; // 設置P4&P5=11,8個dummy clocks,104MQSPITransmit(&temp, 1); }// 擦除一塊4096字節 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,寫扇區擦除指令,地址為0,無數據_32位地址_4線傳輸地址_4線傳輸指令,無空周期,0個字節數據w25qxx_wait_busy(); }// 擦除整個芯片 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,寫全片擦除指令,地址為0,無數據_8位地址_無地址_4線傳輸指令,無空周期,0個字節數據w25qxx_wait_busy(); //等待芯片擦除結束 }// 寫最多256字節 void W25QXXWritePage(uint32_t addr, uint8_t *buffer, uint16_t length) {w25qxx_write_enable(); //寫使能QSPISendCMD(W25QXX_PAGE_PROGRAM, addr, 0, QSPI_INSTRUCTION_4_LINES, QSPI_ADDRESS_4_LINES, QSPI_ADDRESS_32_BITS, QSPI_DATA_4_LINES); // QPI,頁寫指令,地址為WriteAddr,4線傳輸數據_32位地址_4線傳輸地址_4線傳輸指令,無空周期,NumByteToWrite個數據QSPITransmit(buffer, length);w25qxx_wait_busy(); //等待寫入結束 }// 寫最多65536字節 無擦除動作 void W25QXXWriteExt(uint32_t addr, uint8_t *buffer, uint16_t length) {uint16_t pageremain = 256 - addr % 256; // 單頁剩余的字節數if(addr + length - 1 > (32 * 1024 * 1024)){return;}if(length <= pageremain){pageremain = length; // 不大于256個字節}while(1){// 分頁寫入W25QXXWritePage(addr, buffer, pageremain);if(length == pageremain){break; //寫入結束了}else{buffer += pageremain;addr += pageremain;length -= pageremain; // 減去已經寫入了的字節數if(length > 256){pageremain = 256; // 一次可以寫入256個字節}else{pageremain = length; // 不夠256個字節了}}} }// 寫最多65536字節 帶擦除動作 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; // 扇區地址secoff = addr % 4096; // 在扇區內的偏移secremain = 4096 - secoff; // 扇區剩余空間大小if(length <= secremain){secremain = length; // 不大于4096個字節}while(1){WatchdogFeed();W25QXXRead(secpos * 4096, w25q_buf, 4096); // 讀出整個扇區的內容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); // 擦除這個扇區for(i = 0; i < secremain; ++i){w25q_buf[i + secoff] = buffer[i];}W25QXXWriteExt(secpos * 4096, w25q_buf, 4096); // 寫入整個扇區}else{W25QXXWriteExt(addr, buffer, secremain); // 寫已經擦除了的,直接寫入扇區剩余區間.}if(length == secremain){break;}else{secpos++;secoff = 0;buffer += secremain;addr += secremain;length -= secremain;if(length > 4096){secremain = 4096;}else{secremain = length;}}}; }// 讀取SPI FLASH,僅支持QPI模式 在指定地址開始讀取指定長度的數據 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,快速讀數據,地址為ReadAddr,4線傳輸數據_32位地址_4線傳輸地址_4線傳輸指令,8空周期,length個數據QSPIReceive(buffer, length); }也可以使用SPI操作W25QXX。
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