本文最后修改时间：2022年01月08日 10:45
一、本节简介
本节以simple_peripheral工程为例，介绍如何使用SPI读写W25Q80（外部flash）。
二、实验平台
1）CC2640R2F平台
①协议栈版本：CC2640R2 SDK v1.40.00.45
②编译软件：CCS7.3.0.00019
③硬件平台：香瓜CC2640R2F开发板
④仿真器：香瓜XDS100V3下载器
2）外设
①板载在香瓜CC2640R2F开发板底板上的芯片：W25Q80
三、版权声明
1）作者：甜甜的大香瓜
2）声明：喝水不忘挖井人，转载请注明出处。
3）纠错/业务合作：897503845@qq.com
4）香瓜BLE之CC2640R2F群：557278427
5）本文出处：原创连载资料《简单粗暴学蓝牙5》
6）完整开源资料下载地址（电脑端打开）：
opengua.taobao.com
7）香瓜CC2640R2F开发板购买链接：
https://item.taobao.com/item.htm?spm=a1z10.1-c-s.w4023-16963296339.8.21bfc58419sWKt&id=558653143169
四、实验前提
1、在进行本文步骤前，请先阅读以下章节：
1）《简单粗暴学蓝牙5》的“第一章至第四章”章节。
2、在进行本文步骤前，请先实现以下章节：
1）《简单粗暴学蓝牙5》的“第三章 软件的安装及使用”章节。
五、基础知识
1、W25Q80是什么？
答： W25Q80是winbond（华邦）公司出的8M bit（也就是1MB）的flash芯片。同系列常用的型号还有W25Q16（16Mb=2MB）、W25Q32（32Mb=4MB）等。
2、W25Q80的基本信息？
答：
如上图，W25Q80一次可写256字节、可4K字节扇区擦除、32K或者64K块擦除、整片擦除。
使用的是SPI接口、2.7V~3.6V电压范围，香瓜购买的是8-pin SOIC 208-mil封装。
如上图，W25Q80的厂商ID是0xEF，设备ID是0x13。这个用于初始化时识别flash芯片用。
六、硬件原理
1、W25Q80芯片引脚图
如上图，W25Q80一共8个脚，其中GND和VCC供电3.3V（范围在2.7V~3.6V）即可，其他4个SPI引脚DO（输出）、DI（输入）、CLK（时钟）、CS（片选）。
WP（写保护）、HOLD（保持输入）这两个引脚本文并没有用到，且“/WP”中的“/”是低电平有效的意思，所以我们本文将WP和HOLD两引脚拉高到VCC即可。
2、W25Q80与香瓜CC2640R2F开发板的对应关系
| W25Q80引脚 | 香瓜CC2640R2F开发板引脚 |
| 引脚1（/CS） | DIO_30 |
| 引脚2（DO） | DIO_8 |
| 引脚3（/WP） | 置高到VCC |
| 引脚4（GND） | GND |
| 引脚5（DI） | DIO_9 |
| 引脚6（CLK） | DIO_10 |
| 引脚7（/HOLD） | 置高到VCC |
| 引脚6（VCC） | 3.3V |
3、硬件原理图
七、实验步骤
1、编写并添加自定义的W25Q80驱动
1）写一个驱动GUA_ExtFlash.c（存放在“……
\simplelink_cc2640r2_sdk_1_40_00_45\examples\rtos\CC2640R2_LAUNCHXL\ble5stack\simple_peripheral\src\app\GUA“路径下）
| //********************************************************************** //name: GUA_ExtFlash.c //introduce: 外部flash驱动 //author: 甜甜的大香瓜 //email: 897503845@qq.com //QQ group: 香瓜BLE之CC2640R2F(557278427) //shop: opengua.taobao.com //changetime: 2021.08.02 //********************************************************************** #include “string.h” #include <ti/devices/cc26x0r2/driverlib/Ssi.h> #include <ti/drivers/spi/SPICC26XXDMA.h> #include <ti/drivers/dma/UDMACC26XX.h> #include <ti/drivers/SPI.h> #include “GUA_ExtFlash.h” /*********************宏定义************************/ //SPI引脚 #define GUA_CC2640R2_SPI0_MISO IOID_8 #define GUA_CC2640R2_SPI0_MOSI IOID_9 #define GUA_CC2640R2_SPI0_CLK IOID_10 #define GUA_CC2640R2_SPI0_CSN PIN_UNASSIGNED #define GUA_Spi_flash_CS IOID_30 //SPI片选开关宏 #define GUA_FLASH_CS_ON 0 #define GUA_FLASH_CS_OFF 1 /* Instruction codes */ #define GUA_BLS_CODE_PROGRAM 0x02 /**< Page Program */ #define GUA_BLS_CODE_READ 0x03 /**< Read Data */ #define GUA_BLS_CODE_READ_STATUS 0x05 /**< Read Status Register */ #define GUA_BLS_CODE_WRITE_ENABLE 0x06 /**< Write Enable */ #define GUA_BLS_CODE_SECTOR_ERASE 0x20 /**< Sector Erase */ #define GUA_BLS_CODE_MDID 0x90 /**< Manufacturer Device ID */ #define GUA_BLS_CODE_DP 0xB9 /**< Power down */ #define GUA_BLS_CODE_RDP 0xAB /**< Power standby */ /* Erase instructions */ #define GUA_BLS_CODE_ERASE_4K 0x20 /**< Sector Erase */ #define GUA_BLS_CODE_ERASE_32K 0x52 #define GUA_BLS_CODE_ERASE_64K 0xD8 #define GUA_BLS_CODE_ERASE_ALL 0xC7 /**< Mass Erase */ /* Bitmasks of the status register */ #define GUA_BLS_STATUS_SRWD_BM 0x80 #define GUA_BLS_STATUS_BP_BM 0x0C #define GUA_BLS_STATUS_WEL_BM 0x02 #define GUA_BLS_STATUS_WIP_BM 0x01 #define GUA_BLS_STATUS_BIT_BUSY 0x01 /**< Busy bit of the status register */ /* Part specific constants */ #define GUA_BLS_PROGRAM_PAGE_SIZE 256 #define GUA_BLS_ERASE_SECTOR_SIZE 4096 /* Manufacturer IDs */ #define GUA_MF_MACRONIX 0xC2 #define GUA_MF_WINBOND 0xEF typedef enum GUA_CC2640R2_SPIName { GUA_CC2640R2_SPI0 = 0, GUA_CC2640R2_SPICOUNT } GUA_CC2640R2_SPIName; SPICC26XXDMA_Object GUA_spiCC26XXDMAObjects[GUA_CC2640R2_SPICOUNT]; //SPI速度4M #define GUA_SPI_BIT_RATE 4000000 //flash每页大小4K #define GUA_EXT_FLASH_PAGE_SIZE 4096 /*********************内部变量************************/ const SPICC26XXDMA_HWAttrsV1 GUA_spiCC26XXDMAHWAttrs[GUA_CC2640R2_SPICOUNT] = { { .baseAddr = SSI0_BASE, .intNum = INT_SSI0_COMB, .intPriority = ~0, .swiPriority = 0, .powerMngrId = PowerCC26XX_PERIPH_SSI0, .defaultTxBufValue = 0, .rxChannelBitMask = 1<<UDMA_CHAN_SSI0_RX, .txChannelBitMask = 1<<UDMA_CHAN_SSI0_TX, .mosiPin = GUA_CC2640R2_SPI0_MOSI, .misoPin = GUA_CC2640R2_SPI0_MISO, .clkPin = GUA_CC2640R2_SPI0_CLK, .csnPin = GUA_CC2640R2_SPI0_CSN } }; const SPI_Config GUA_SPI_config[GUA_CC2640R2_SPICOUNT] = { { .fxnTablePtr = &SPICC26XXDMA_fxnTable, .object = &GUA_spiCC26XXDMAObjects[GUA_CC2640R2_SPI0], .hwAttrs = &GUA_spiCC26XXDMAHWAttrs[GUA_CC2640R2_SPI0] }, }; const uint_least8_t GUA_SPI_count = GUA_CC2640R2_SPICOUNT; static PIN_Config GUA_BoardFlashPinTable[] = { GUA_Spi_flash_CS | PIN_GPIO_OUTPUT_EN | PIN_GPIO_LOW | PIN_PUSHPULL | PIN_DRVSTR_MIN, /* Ext. flash chip select */ PIN_TERMINATE }; static PIN_Handle GUA_hFlashPin = NULL; static PIN_State GUA_pinState; // Supported flash devices static GUA_ExtFlashInfo_t GUA_flashInfo[] = { { .manfId = GUA_MF_MACRONIX, // Macronics .devId = 0x15, // MX25R1635F .deviceSize = 0x200000 // 2 Mbyte (16 Mbit) }, { .manfId = GUA_MF_MACRONIX, // Macronics .devId = 0x14, // MX25R8035F .deviceSize = 0x100000 // 1 Mbyte (8 Mbit) }, { .manfId = GUA_MF_WINBOND, // WinBond .devId = 0x13, // W25Q80DV .deviceSize = 0x100000 // 1 Mbyte (8 Mbit) }, { .manfId = GUA_MF_WINBOND, // WinBond .devId = 0x12, // W25X40CL .deviceSize = 0x080000 // 512 Kbyte (4 Mbit) }, { .manfId = GUA_MF_WINBOND, // WinBond .devId = 0x11, // W25X20CL .deviceSize = 0x040000 // 256 Kbyte (2 Mbit) }, { .manfId = 0x0, .devId = 0x0, .deviceSize = 0x0 } }; // Flash information static GUA_ExtFlashInfo_t *pGUA_flashInfo = NULL; static GUA_U8 GUA_infoBuf[2]; // SPI interface static SPI_Handle GUA_spiHandle = NULL; static SPI_Params GUA_spiParams; /*********************内部函数************************/ static int GUA_Spi_write(const GUA_U8 *pGUA_buf, size_t GUA_length); static int GUA_Spi_read(GUA_U8 *pGUA_buf, size_t GUA_length); static bool GUA_Spi_open(GUA_U32 GUA_bitRate); static void GUA_Spi_close(void); static void GUA_Spi_flash(void); static void GUA_extFlashSelect(void); static void GUA_extFlashDeselect(void); static bool GUA_extFlashPowerDown(void); static bool GUA_extFlashPowerStandby(void); static bool GUA_ExtFlash_readInfo(void); static bool GUA_extFlashVerifyPart(void); static int GUA_ExtFlash_waitReady(void); static int GUA_ExtFlash_powerDown(void); static int GUA_ExtFlash_writeEnable(void); //********************************************************************** //name: GUA_Spi_write //introduce: 写SPI设备 //parameter: pGUA_buf:写缓存 // GUA_len:数据长度 //return: 如果操作正常，返回0；反之返回1 //author: 甜甜的大香瓜 //email: 897503845@qq.com //QQ group: 香瓜BLE之CC2640R2F(557278427) //shop: opengua.taobao.com //changetime: 2021.08.02 //********************************************************************** static int GUA_Spi_write(const GUA_U8 *pGUA_buf, size_t GUA_len) { SPI_Transaction masterTransaction; masterTransaction.count = GUA_len; masterTransaction.txBuf = (void*)pGUA_buf; masterTransaction.arg = NULL; masterTransaction.rxBuf = NULL; return SPI_transfer(GUA_spiHandle, &masterTransaction) ? 0 : -1; } //********************************************************************** //name: GUA_Spi_read //introduce: 读SPI设备 //parameter: pGUA_buf:读缓存 // GUA_len:数据长度 //return: 如果操作正常，返回0；反之返回1 //author: 甜甜的大香瓜 //email: 897503845@qq.com //QQ group: 香瓜BLE之CC2640R2F(557278427) //shop: opengua.taobao.com //changetime: 2021.08.02 //********************************************************************** static int GUA_Spi_read(GUA_U8 *pGUA_buf, size_t GUA_len) { SPI_Transaction masterTransaction; masterTransaction.count = GUA_len; masterTransaction.txBuf = NULL; masterTransaction.arg = NULL; masterTransaction.rxBuf = pGUA_buf; return SPI_transfer(GUA_spiHandle, &masterTransaction) ? 0 : -1; } //********************************************************************** //name: GUA_Spi_open //introduce: 打开SPI //parameter: GUA_bitRate:要设置的SPI速度 //return: 如果操作正常，返回true；反之返回false //author: 甜甜的大香瓜 //email: 897503845@qq.com //QQ group: 香瓜BLE之CC2640R2F(557278427) //shop: opengua.taobao.com //changetime: 2021.08.02 //********************************************************************** static bool GUA_Spi_open(GUA_U32 GUA_bitRate) { /* Configure SPI as master */ SPI_Params_init(&GUA_spiParams); GUA_spiParams.bitRate = GUA_bitRate; GUA_spiParams.mode = SPI_MASTER; GUA_spiParams.transferMode = SPI_MODE_BLOCKING; /* Attempt to open SPI. */ GUA_spiHandle = SPI_open(GUA_CC2640R2_SPI0, &GUA_spiParams); return GUA_spiHandle != NULL; } //********************************************************************** //name: GUA_Spi_close //introduce: 关闭SPI //parameter: none //return: none //author: 甜甜的大香瓜 //email: 897503845@qq.com //QQ group: 香瓜BLE之CC2640R2F(557278427) //shop: opengua.taobao.com //changetime: 2021.08.02 //********************************************************************** static void GUA_Spi_close(void) { if (GUA_spiHandle != NULL) { // Close the RTOS driver SPI_close(GUA_spiHandle); GUA_spiHandle = NULL; } } //********************************************************************** //name: GUA_Spi_flash //introduce: 把没用的垃圾数据处理掉 //parameter: none //return: none //author: 甜甜的大香瓜 //email: 897503845@qq.com //QQ group: 香瓜BLE之CC2640R2F(557278427) //shop: opengua.taobao.com //changetime: 2021.08.02 //********************************************************************** static void GUA_Spi_flash(void) { /* make sure SPI hardware module is done */ while(SSIBusy(((SPICC26XXDMA_HWAttrsV1*)GUA_spiHandle->hwAttrs)->baseAddr)) { }; } //********************************************************************** //name: GUA_extFlashSelect //introduce: 片选引脚选择外部flash //parameter: none //return: none //author: 甜甜的大香瓜 //email: 897503845@qq.com //QQ group: 香瓜BLE之CC2640R2F(557278427) //shop: opengua.taobao.com //changetime: 2021.08.02 //********************************************************************** static void GUA_extFlashSelect(void) { PIN_setOutputValue(GUA_hFlashPin, GUA_Spi_flash_CS, GUA_FLASH_CS_ON); } //********************************************************************** //name: GUA_extFlashDeselect //introduce: 取消片选引脚选择外部flash //parameter: none //return: none //author: 甜甜的大香瓜 //email: 897503845@qq.com //QQ group: 香瓜BLE之CC2640R2F(557278427) //shop: opengua.taobao.com //changetime: 2021.08.02 //********************************************************************** static void GUA_extFlashDeselect(void) { PIN_setOutputValue(GUA_hFlashPin, GUA_Spi_flash_CS, GUA_FLASH_CS_OFF); } //********************************************************************** //name: GUA_extFlashPowerDown //introduce: 让设备进入低功耗模式，不能访问数据，只能读取寄存器状态 //parameter: none //return: 如果操作正常，返回true；反之返回false //author: 甜甜的大香瓜 //email: 897503845@qq.com //QQ group: 香瓜BLE之CC2640R2F(557278427) //shop: opengua.taobao.com //changetime: 2021.08.02 //********************************************************************** static bool GUA_extFlashPowerDown(void) { GUA_U8 GUA_cmd; bool GUA_success; GUA_cmd = GUA_BLS_CODE_DP; GUA_extFlashSelect(); GUA_success = GUA_Spi_write(&GUA_cmd, sizeof(GUA_cmd)) == 0; GUA_extFlashDeselect(); return GUA_success; } //********************************************************************** //name: GUA_extFlashPowerStandby //introduce: 退出低功耗模式 //parameter: none //return: 如果操作正常，返回true；反之返回false //author: 甜甜的大香瓜 //email: 897503845@qq.com //QQ group: 香瓜BLE之CC2640R2F(557278427) //shop: opengua.taobao.com //changetime: 2021.08.02 //********************************************************************** static bool GUA_extFlashPowerStandby(void) { GUA_U8 GUA_cmd; bool GUA_success; GUA_cmd = GUA_BLS_CODE_RDP; GUA_extFlashSelect(); GUA_success = GUA_Spi_write(&GUA_cmd, sizeof(GUA_cmd)) == 0; GUA_extFlashDeselect(); if(GUA_success) { if(GUA_ExtFlash_waitReady() != 0) { GUA_success = false; } } return GUA_success; } //********************************************************************** //name: GUA_ExtFlash_readInfo //introduce: 读flash信息（厂商ID和设备ID） //parameter: none //return: 如果操作正常，返回true；反之返回false //author: 甜甜的大香瓜 //email: 897503845@qq.com //QQ group: 香瓜BLE之CC2640R2F(557278427) //shop: opengua.taobao.com //changetime: 2021.08.02 //********************************************************************** static bool GUA_ExtFlash_readInfo(void) { const GUA_U8 GUA_wbuf[] = {GUA_BLS_CODE_MDID, 0xFF, 0xFF, 0x00}; GUA_extFlashSelect(); int GUA_ret = GUA_Spi_write(GUA_wbuf, sizeof(GUA_wbuf)); if(GUA_ret) { GUA_extFlashDeselect(); return false; } GUA_ret = GUA_Spi_read(GUA_infoBuf, sizeof(GUA_infoBuf)); GUA_extFlashDeselect(); return GUA_ret == 0; } //********************************************************************** //name: GUA_extFlashVerifyPart //introduce: 校验flash芯片是否是驱动支持的flash //parameter: none //return: 如果操作正常，返回true；反之返回false //author: 甜甜的大香瓜 //email: 897503845@qq.com //QQ group: 香瓜BLE之CC2640R2F(557278427) //shop: opengua.taobao.com //changetime: 2021.08.02 //********************************************************************** static bool GUA_extFlashVerifyPart(void) { if(!GUA_ExtFlash_readInfo()) { return false; } pGUA_flashInfo = GUA_flashInfo; while(pGUA_flashInfo->deviceSize > 0) { if(GUA_infoBuf[0] == pGUA_flashInfo->manfId && GUA_infoBuf[1] == pGUA_flashInfo->devId) { break; } pGUA_flashInfo++; } return pGUA_flashInfo->deviceSize > 0; } //********************************************************************** //name: GUA_ExtFlash_waitReady //introduce: 等待当前擦除、编程的操作结束 //parameter: none //return: 如果操作正常，返回0；反之返回非0 //author: 甜甜的大香瓜 //email: 897503845@qq.com //QQ group: 香瓜BLE之CC2640R2F(557278427) //shop: opengua.taobao.com //changetime: 2021.08.02 //********************************************************************** static int GUA_ExtFlash_waitReady(void) { const GUA_U8 GUA_wbuf[1] = {GUA_BLS_CODE_READ_STATUS}; int GUA_ret; /* Throw away all garbage */ GUA_extFlashSelect(); GUA_Spi_flash(); GUA_extFlashDeselect(); for(;;) { GUA_U8 GUA_buf; GUA_extFlashSelect(); GUA_Spi_write(GUA_wbuf, sizeof(GUA_wbuf)); GUA_ret = GUA_Spi_read(&GUA_buf, sizeof(GUA_buf)); GUA_extFlashDeselect(); if(GUA_ret) { /* Error */ return -2; } if(!(GUA_buf & GUA_BLS_STATUS_BIT_BUSY)) { /* Now ready */ break; } } return 0; } //********************************************************************** //name: GUA_ExtFlash_powerDown //introduce: 等待进入低功耗模式 //parameter: none //return: 如果操作正常，返回0；反之返回非0 //author: 甜甜的大香瓜 //email: 897503845@qq.com //QQ group: 香瓜BLE之CC2640R2F(557278427) //shop: opengua.taobao.com //changetime: 2021.08.02 //********************************************************************** static int GUA_ExtFlash_powerDown(void) { GUA_U8 GUA_i; GUA_i = 0; while(GUA_i < 10) { if(!GUA_ExtFlash_readInfo()) { return 0; } GUA_i++; } return -1; } //********************************************************************** //name: GUA_ExtFlash_writeEnable //introduce: 启动写操作 //parameter: none //return: 如果操作正常，返回0；反之返回非0 //author: 甜甜的大香瓜 //email: 897503845@qq.com //QQ group: 香瓜BLE之CC2640R2F(557278427) //shop: opengua.taobao.com //changetime: 2021.08.02 //********************************************************************** static int GUA_ExtFlash_writeEnable(void) { const GUA_U8 GUA_wbuf[] = {GUA_BLS_CODE_WRITE_ENABLE}; GUA_extFlashSelect(); int GUA_ret = GUA_Spi_write(GUA_wbuf, sizeof(GUA_wbuf)); GUA_extFlashDeselect(); if(GUA_ret) { return -3; } return 0; } //********************************************************************** //name: GUA_ExtFlash_open //introduce: 初始化flash //parameter: none //return: 如果操作正常，返回true；反之返回false //author: 甜甜的大香瓜 //email: 897503845@qq.com //QQ group: 香瓜BLE之CC2640R2F(557278427) //shop: opengua.taobao.com //changetime: 2021.08.02 //********************************************************************** bool GUA_ExtFlash_open(void) { bool GUA_f; GUA_hFlashPin = PIN_open(&GUA_pinState, GUA_BoardFlashPinTable); if(GUA_hFlashPin == NULL) { return false; } /* Initialise SPI. Subsequent calls will do nothing. */ SPI_init(); /* Make sure SPI is available */ GUA_f = GUA_Spi_open(GUA_SPI_BIT_RATE); if (GUA_f) { /* Put the part is standby mode */ GUA_f = GUA_extFlashPowerStandby(); if(GUA_f) { /* Verify manufacturer and device ID */ GUA_f = GUA_extFlashVerifyPart(); } if(!GUA_f) { GUA_ExtFlash_close(); } } return GUA_f; } //********************************************************************** //name: GUA_ExtFlash_close //introduce: 关闭flash //parameter: none //return: 如果操作正常，返回true；反之返回false //author: 甜甜的大香瓜 //email: 897503845@qq.com //QQ group: 香瓜BLE之CC2640R2F(557278427) //shop: opengua.taobao.com //changetime: 2021.08.02 //********************************************************************** void GUA_ExtFlash_close(void) { if(GUA_hFlashPin != NULL) { // Put the part in low power mode GUA_extFlashPowerDown(); if(pGUA_flashInfo->manfId == GUA_MF_WINBOND) { GUA_ExtFlash_powerDown(); } /* Make sure SPI lines have a defined state */ GUA_Spi_close(); PIN_close(GUA_hFlashPin); GUA_hFlashPin = NULL; } } //********************************************************************** //name: GUA_ExtFlash_read //introduce: 读flash //parameter: GUA_offset:偏移地址 // GUA_length:数据长度 // pGUA_buf:接收缓存区 //return: 如果操作正常，返回true；反之返回false //author: 甜甜的大香瓜 //email: 897503845@qq.com //QQ group: 香瓜BLE之CC2640R2F(557278427) //shop: opengua.taobao.com //changetime: 2021.08.02 //********************************************************************** bool GUA_ExtFlash_read(size_t GUA_offset, size_t GUA_length, GUA_U8 *pGUA_buf) { GUA_U8 GUA_wbuf[4]; /* Wait till previous erase/program operation completes */ int GUA_ret = GUA_ExtFlash_waitReady(); if(GUA_ret) { return false; } /* SPI is driven with very low frequency (1MHz < 33MHz fR spec) * in this temporary implementation. * and hence it is not necessary to use fast read. */ GUA_wbuf[0] = GUA_BLS_CODE_READ; GUA_wbuf[1] = (GUA_offset >> 16) & 0xff; GUA_wbuf[2] = (GUA_offset >> 8) & 0xff; GUA_wbuf[3] = GUA_offset & 0xff; GUA_extFlashSelect(); if(GUA_Spi_write(GUA_wbuf, sizeof(GUA_wbuf))) { /* failure */ GUA_extFlashDeselect(); return false; } GUA_ret = GUA_Spi_read(pGUA_buf, GUA_length); GUA_extFlashDeselect(); return GUA_ret == 0; } //********************************************************************** //name: GUA_ExtFlash_write //introduce: 写flash //parameter: GUA_offset:偏移地址 // GUA_length:数据长度 // pGUA_buf:发送缓存区 //return: 如果操作正常，返回true；反之返回false //author: 甜甜的大香瓜 //email: 897503845@qq.com //QQ group: 香瓜BLE之CC2640R2F(557278427) //shop: opengua.taobao.com //changetime: 2021.08.02 //********************************************************************** bool GUA_ExtFlash_write(size_t GUA_offset, size_t GUA_length, const GUA_U8 *pGUA_buf) { GUA_U8 GUA_wbuf[4]; while(GUA_length > 0) { /* Wait till previous erase/program operation completes */ int GUA_ret = GUA_ExtFlash_waitReady(); if(GUA_ret) { return false; } GUA_ret = GUA_ExtFlash_writeEnable(); if (GUA_ret) { return false; } size_t GUA_ilen; /* interim GUA_length per instruction */ GUA_ilen = GUA_BLS_PROGRAM_PAGE_SIZE – (GUA_offset % GUA_BLS_PROGRAM_PAGE_SIZE); if (GUA_length < GUA_ilen) { GUA_ilen = GUA_length; } GUA_wbuf[0] = GUA_BLS_CODE_PROGRAM; GUA_wbuf[1] = (GUA_offset >> 16) & 0xff; GUA_wbuf[2] = (GUA_offset >> 8) & 0xff; GUA_wbuf[3] = GUA_offset & 0xff; GUA_offset += GUA_ilen; GUA_length -= GUA_ilen; /* Up to 100ns CS hold time (which is not clear * whether it’s application only in between reads) * is not imposed here since above instructions * should be enough to delay * as much. */ GUA_extFlashSelect(); if (GUA_Spi_write(GUA_wbuf, sizeof(GUA_wbuf))) { /* failure */ GUA_extFlashDeselect(); return false; } if (GUA_Spi_write(pGUA_buf, GUA_ilen)) { /* failure */ GUA_extFlashDeselect(); return false; } pGUA_buf += GUA_ilen; GUA_extFlashDeselect(); } return true; } //********************************************************************** //name: GUA_ExtFlash_erase //introduce: 擦除flash //parameter: GUA_offset:偏移地址 // GUA_length:数据长度 // pGUA_buf:发送缓存区 //return: 如果操作正常，返回true；反之返回false //author: 甜甜的大香瓜 //email: 897503845@qq.com //QQ group: 香瓜BLE之CC2640R2F(557278427) //shop: opengua.taobao.com //changetime: 2021.08.02 //********************************************************************** bool GUA_ExtFlash_erase(size_t GUA_offset, size_t GUA_length) { /* Note that Block erase might be more efficient when the floor map * is well planned for OTA but to simplify for the temporary implementation, * sector erase is used blindly. */ GUA_U8 GUA_wbuf[4]; size_t GUA_i, GUA_numsectors; GUA_wbuf[0] = GUA_BLS_CODE_SECTOR_ERASE; { size_t GUA_endoffset = GUA_offset + GUA_length – 1; GUA_offset = (GUA_offset / GUA_BLS_ERASE_SECTOR_SIZE) * GUA_BLS_ERASE_SECTOR_SIZE; GUA_numsectors = (GUA_endoffset – GUA_offset + GUA_BLS_ERASE_SECTOR_SIZE – 1) / GUA_BLS_ERASE_SECTOR_SIZE; } for(GUA_i = 0; GUA_i < GUA_numsectors; GUA_i++) { /* Wait till previous erase/program operation completes */ int GUA_ret = GUA_ExtFlash_waitReady(); if(GUA_ret) { return false; } GUA_ret = GUA_ExtFlash_writeEnable(); if(GUA_ret) { return false; } GUA_wbuf[1] = (GUA_offset >> 16) & 0xff; GUA_wbuf[2] = (GUA_offset >> 8) & 0xff; GUA_wbuf[3] = GUA_offset & 0xff; GUA_extFlashSelect(); if(GUA_Spi_write(GUA_wbuf, sizeof(GUA_wbuf))) { /* failure */ GUA_extFlashDeselect(); return false; } GUA_extFlashDeselect(); GUA_offset += GUA_BLS_ERASE_SECTOR_SIZE; } return true; } //********************************************************************** //name: GUA_ExtFlash_info //introduce: 获取当前连接的外部flash的信息 //parameter: none //return: ExtFlashInfo_t(包含设备内存大小、厂商ID、设备ID) //author: 甜甜的大香瓜 //email: 897503845@qq.com //QQ group: 香瓜BLE之CC2640R2F(557278427) //shop: opengua.taobao.com //changetime: 2021.08.02 //********************************************************************** GUA_ExtFlashInfo_t *GUA_ExtFlash_info(void) { return pGUA_flashInfo; } |
2）写一个驱动头文件GUA_ExtFlash.h（存放在“……
\simplelink_cc2640r2_sdk_1_40_00_45\examples\rtos\CC2640R2_LAUNCHXL\ble5stack\simple_peripheral\src\app\GUA“路径下）
| //********************************************************************** //name: GUA_ExtFlash.h //introduce: 外部flash驱动的头文件 //author: 甜甜的大香瓜 //email: 897503845@qq.com //QQ group: 香瓜BLE之CC2640R2F(557278427) //shop: opengua.taobao.com //changetime: 2021.08.02 //********************************************************************** #ifndef GUA_EXT_FLASH_H #define GUA_EXT_FLASH_H //头文件 #include <stdlib.h> #include <stdbool.h> /*********************宏定义************************/ //类型宏 #ifndef GUA_C typedef char GUA_C; #endif #ifndef GUA_U8 typedef unsigned char GUA_U8; #endif #ifndef GUA_8 typedef signed char GUA_8; #endif #ifndef GUA_U16 typedef unsigned short GUA_U16; #endif #ifndef GUA_16 typedef signed short GUA_16; #endif #ifndef GUA_U32 typedef unsigned long GUA_U32; #endif #ifndef GUA_32 typedef signed long GUA_32; #endif #ifndef GUA_U64 typedef unsigned long long GUA_U64; #endif #ifndef GUA_64 typedef signed long long GUA_64; #endif /*********************外部变量************************/ //设备信息结构体 typedef struct { GUA_U32 deviceSize; // bytes GUA_U8 manfId; // manufacturer ID GUA_U8 devId; // device ID } GUA_ExtFlashInfo_t; /*********************函数声明************************/ extern bool GUA_ExtFlash_open(void); extern void GUA_ExtFlash_close(void); extern bool GUA_ExtFlash_read(size_t GUA_offset, size_t GUA_length, GUA_U8 *pGUA_buf); extern bool GUA_ExtFlash_write(size_t GUA_offset, size_t GUA_length, const GUA_U8 *pGUA_buf); extern bool GUA_ExtFlash_erase(size_t GUA_offset, size_t GUA_length); extern GUA_ExtFlashInfo_t *GUA_ExtFlash_info(void); #endif |
3、工程中添加驱动文件GUA_ExtFlash.c、GUA_ExtFlash.h
注：拖拽至CCS工程的Application文件夹下
添加文件过程中，选项选择如下
4、应用层调用
1）添加头文件（simple_peripheral.c中）
| //GUA #include “GUA_ ExtFlash.h” //GUA |
2）添加测试代码（simple_peripheral.c的SimpleBLEPeripheral_init函数末尾中）
| //GUA GUA_U32 GUA_offset = 0x012233; GUA_U8 GUA_write_buf[7] = {‘o’,’p’,’e’,’n’,’g’,’u’,’a’}; GUA_U8 GUA_read_buf[7] = {0}; bool GUA_flash_Ret; //初始化flash GUA_flash_Ret = GUA_ExtFlash_open(); if(GUA_flash_Ret == true) { //擦除flash GUA_flash_Ret = GUA_ExtFlash_erase(GUA_offset, sizeof(GUA_write_buf)); if(GUA_flash_Ret == true) { //写flash GUA_flash_Ret = GUA_ExtFlash_write(GUA_offset, sizeof(GUA_write_buf), GUA_write_buf); if(GUA_flash_Ret == true) { //读flash GUA_flash_Ret = GUA_ExtFlash_read(GUA_offset, sizeof(GUA_read_buf), GUA_read_buf); if(GUA_flash_Ret == true) { //读正确后关flash GUA_ExtFlash_close(); } } } } //GUA |
上述代码，先将0x012233地址擦除7个字节，再写入7个字节“opengua”，再读出7个字节，判断是否读出的是“opengua”，以此来判断是否有正常写入。
八、注意事项
1、W25Q80的内存大小是1M，也就是0x100000，所以读、写、擦除的范围就是0~0x100000。
2、在写入之前，需要先擦除，否则会写入不成功。
3、本文驱动会与《香瓜CC2640R2F之LCD》冲突，因为都是使用SPI。如果只是想检测flash是否良好，可以在oled启动之前，测试一下flash再关闭。思路如下
| //flash测试代码 //…… //oled初始化代码 //…… //GUA //用oled显示flash的好坏 if(GUA_flash_Ret == true) { GUA_LCD_WriteString(“flash OK”, GUA_LCD_LINE7); } else { GUA_LCD_WriteString(“flash error”, GUA_LCD_LINE7); } //GUA |
九、实验结果
仿真并设置断点，查看读出的flash数据
可见读出的是“opengua”，与写入的数据一样，表示读写正常。
因此，实验成功。
