原创现场升级方案：采用U盘方式进行IAP功能的实现（一）

 2015-2-22 21:22  3158 19 19 分类: MCU/ 嵌入式

闲来无事，总结一下前段时间做过的U盘升级项目。一个新手的成长之路在于善于总结，生活也是一样扯远了，我准备了两个软件环境，一个带操作系统（UCOS）的，另一个裸机版的。随后我会附上两个程序代码。U盘升级可以分为两部分代码：U盘读取bin文件和IAP功能两部分。大概说一下实现过程，具体IAP网上都玩坏了。硬件环境：NXP 1788

软件环境：KEIL实现过程：上面说了我准备了两个程序，就用裸机版的代码说一下实现流程。带操作系统的原理都是一样的。只是多创建几个任务而已。USB_HOST实现IAP升级，总的思路就是：复制bin文件到U盘->目标板断电，插上U盘->目标板上电，进入升级->运行升级程序。其实可以更具体，比如说设置升级标志或者按键。拿到一个程序先从main开始，直接贴代码，说一大堆废话有什么用。

int main()
{
int32_t rc;
uint32_t numBlks, blkSize;
uint8_t inquiryResult[INQUIRY_LENGTH];

SystemInit(); /*目标板初始化 */

    UART_Init(57600);          /* 串口调试初始化          */
    Host_Init();                   /* USB初始化*/
    rc = Host_EnumDev();       /* USB设备枚举          */
    if (rc == OK) {
  /* Initialize the mass storage and scsi interfaces */
        rc = MS_Init( &blkSize, &numBlks, inquiryResult );
        if (rc == OK) {
            rc = FAT_Init();   /*文件系统初始化*/
            if (rc == OK) {
                Bin_Read();    /*读取bin文件调用IAP     */
            } else {
                return (0);
            }
        } else {
            return (0);
        }
    } else {
        return (0);
    }
    while(1);
}

下面分模块说一下，前面的硬件初始化函数很简单，USB设备枚举和FAT文件系统NXP官网上都有，只需改硬件接口，Host_Init函数如下：

void Host_Init (void)
{
uint32_t HostBaseAddr;

    LPC_SC->PCONP   |= 0x80000000;
    LPC_USB->OTGClkCtrl   = 0x00000019; /* Enable USB host clock                      */
    while ((LPC_USB->OTGClkSt & 0x00000019) != 0x19);

LPC_USB->StCtrl = 0x1; /* 01: U1 = host (OTG), U2 = host */

   LPC_IOCON->P0_29 &= ~(0x07UL << 0);
    LPC_IOCON->P0_30 &= ~(0x07UL << 0);
    LPC_IOCON->P1_28 &= ~(0x07UL << 0);
    LPC_IOCON->P1_29 &= ~(0x07UL << 0);

    LPC_IOCON->P0_29 |= 0x01UL << 0;                                    /* P0.29 -- USB1 D+            */
    LPC_IOCON->P0_30 |= 0x01UL << 0;                                    /* P0.30 -- USB1 D-            */
    LPC_IOCON->P1_28 |= 0x01UL << 0;                                    /* P1.28 -- USB_SCL1           */
    LPC_IOCON->P1_29 |= 0x01UL << 0;                                    // P1.29 -- USB_SDA1
   PRINT_Log("Initializing Host Stack\n");

/* Set up host base address and TD and ED descriptors */
HostBaseAddr = HOST_BASE_ADDR;

    Hcca       = (volatile HCCA       *)(HostBaseAddr+0x000);
    TDHead     = (volatile HCTD       *)(HostBaseAddr+0x100);
    TDTail     = (volatile HCTD       *)(HostBaseAddr+0x110);
    EDCtrl     = (volatile HCED       *)(HostBaseAddr+0x120);
    EDBulkIn   = (volatile HCED       *)(HostBaseAddr+0x130);
    EDBulkOut = (volatile HCED       *)(HostBaseAddr+0x140);
    TDBuffer   = (volatile uint8_t *)(HostBaseAddr+0x150);
    FATBuffer = (volatile uint8_t *)(HostBaseAddr+0x1D0);
    UserBuffer = (volatile uint8_t *)(HostBaseAddr+0x1000);

    /* Initialize all the TDs, EDs and HCCA to 0 */
    Host_EDInit(EDCtrl);
    Host_EDInit(EDBulkIn);
    Host_EDInit(EDBulkOut);
    Host_TDInit(TDHead);
    Host_TDInit(TDTail);
    Host_HCCAInit(Hcca);

    Host_DelayMS(50);                /* Wait 50 ms before apply reset              */
    LPC_USB->Control       = 0;    /* HARDWARE RESET                             */
    LPC_USB->ControlHeadED = 0;    /* Initialize Control list head to Zero       */
    LPC_USB->BulkHeadED    = 0;    /* Initialize Bulk list head to Zero          */

    /* SOFTWARE RESET                             */
    LPC_USB->CommandStatus = OR_CMD_STATUS_HCR;
    LPC_USB->FmInterval    = DEFAULT_FMINTERVAL; /* Write Fm Interval and Largest Data Packet Counter */

                                                    /* Put HC in operational state                */
    LPC_USB->Control = (LPC_USB->Control & (~OR_CONTROL_HCFS)) | OR_CONTROL_HC_OPER;
    LPC_USB->RhStatus = OR_RH_STATUS_LPSC;        /* Set Global Power                           */

    LPC_USB->HCCA = (uint32_t)Hcca;
    LPC_USB->InterruptStatus |= LPC_USB->InterruptStatus;                   /* Clear Interrrupt Status                    */

    LPC_USB->InterruptEnable = OR_INTR_ENABLE_MIE |
                         OR_INTR_ENABLE_WDH |
                         OR_INTR_ENABLE_RHSC |
                         OR_INTR_ENABLE_UE;

/* Enable the USB Interrupt */
NVIC_EnableIRQ(USB_IRQn); /* enable USB interrupt */
NVIC_SetPriority (USB_IRQn, 0); /* highest priority */

PRINT_Log("Host Initialized\n");
}

这段主要是USB引脚配置和USB主机初始化。Bin_Read()函数如下：

void Bin_Read (void)
{
      int32_t fdr;
      uint32_t bytes_read,writelen;
     uint32_t dstaddr;
      SelSector(APP_START_SECTOR,APP_END_SECTOR);        //选择扇区
      EraseSector(APP_START_SECTOR,APP_END_SECTOR);                          /* 擦除扇区                     */
      BlankCHK(APP_START_SECTOR,APP_END_SECTOR);                             /* 查空扇区                    */
      SelSector(APP_START_SECTOR,APP_END_SECTOR);
      PRINT_Log("\r\nstart file operations...\r\n");

    fdr = FILE_Open(FILENAME_R, RDONLY);
    if (fdr > 0) {
        PRINT_Log("Reading from %s...\n", FILENAME_R);
  for(writelen=0;writelen<(APP_END_ADDR-APP_START_ADDR)/1024;writelen++)
   {
    bytes_read = FILE_Read(fdr, UserBuffer, MAX_BUFFER_SIZE);            /* 读出文件                */
    dstaddr = (uint32_t)(APP_START_ADDR + (writelen)*1024);//dst address.
    SelSector(APP_START_SECTOR,APP_END_SECTOR);
    RamToFlash(dstaddr,(uint32_t)UserBuffer, 1024);
    Compare(dstaddr, (uint32_t)UserBuffer, 1024);
    }
  // printf("%x",writelen);
  PRINT_Log("\r\n write file successful\r\n");
    SCB->VTOR = APP_START_ADDR;                                    /* 重新映射向量表          */
    ExceuteApplication();                                                     /*执行用户程序*/
  FILE_Close(fdr);                                                                /*关闭文件系统*/
    } else {
        PRINT_Log("\r\n write file failed\r\n");
    }
}void Bin_Read (void)
{
      int32_t fdr;
      uint32_t bytes_read,writelen;
     uint32_t dstaddr;
      SelSector(APP_START_SECTOR,APP_END_SECTOR);
      EraseSector(APP_START_SECTOR,APP_END_SECTOR);                          /* ²Á³ýÉÈÇø                     */
      BlankCHK(APP_START_SECTOR,APP_END_SECTOR);                             /* ²é¿ÕÉÈÇø                     */
      SelSector(APP_START_SECTOR,APP_END_SECTOR);
      PRINT_Log("\r\nstart file operations...\r\n");

将flash划分为两个区，bootloader和APP区，bootloader存放升级引导程序，即我们的USB_HOST_IAP代码，根据具体的Code大小确定bootloader的扇区，APP就是用户程序即需要升级的程序代码。APP需要配置后面再说。这是我的扇区划分：

#define     IAP_START_ADDR 0x00000000                                  // IAP开始地址
#define     IAP_LOCATION     0x1FFF1FF1                                   /* IAP升级的入口地址          */
/* The area will be erase and program */
#define APP_START_ADDR      0x00A000              // 用户程序起始地址
#define APP_END_ADDR        0x78000                //LPC1788 512K Flash
//#define APP_SIZE       0x10000
/*
* Define the flash sectors used by the application
*/
#define APP_START_SECTOR     10
#define APP_END_SECTOR         29                   // LPC1788 512K Flash扇区

接下面

现场升级方案：采用U盘方式进行IAP功能的实现（二）

头条号：
https://www.toutiao.com/c/user/8115738721/#mid=1646025109246987

CSDN ：

https://blog.csdn.net/u012246376