STM32 IAP入门示例

一、IAP介绍

IAP（In applicating Programing）即应用编程。可以实现在使用过程中，通过串口等直接对程序进行更新，而不需要使用烧写器。

以下是找到的一个可以使用的IAP demo（Ymode传输模式）

https://github.com/dong930623/IAP

使用时注意以下几点

 

1.APP需要设置偏移，这里使用的是STMF103RBT6芯片，所以偏移设置10000 所以IROM为0x8010000

2.初始化中也要进行偏移的设置

   SCB->VTOR = FLASH_BASE | 0x10000;

3.编写bin文件

   使用IAP升级时，需要使用二进制文件，即.bin文件

 

有IAP时，程序运行的流程图

二、IAP的实现

 

//接收到IAP更新标志，进行更新  1 /**  2   * Íùij¸öµØÖ·ÇøÓòдÈëÊý¾Ý  3   * iAddress ÆðʼµØÖ· buf Êý×éÖ¸Õë iNbrToRead ÐèҪдÈëÊý×éµÄ³¤¶È´óС    4   */  5 uint16_t Flash_Write_Without_check(uint32_t iAddress, uint8_t *buf, uint16_t iNumByteToWrite) {  6     uint16_t i;  7     volatile FLASH_Status FLASHStatus = FLASH_COMPLETE;  8     i = 0;  9      10 //    FLASH_UnlockBank1(); 11     while((i < iNumByteToWrite) && (FLASHStatus == FLASH_COMPLETE)) 12     { 13       FLASHStatus = FLASH_ProgramHalfWord(iAddress, *(uint16_t*)buf); 14       i = i+2; 15       iAddress = iAddress + 2; 16       buf = buf + 2; 17     } 18      19     return iNumByteToWrite; 20 } 21 /** 22   * Íùij¸öµØÖ·ÇøÓòдÈëÊý¾Ý 23   * iAddress ÆðʼµØÖ· buf Êý×éÖ¸Õë iNbrToRead ÐèҪдÈëÊý×éµÄ³¤¶È´óС   24   */ 25 int Flash_Write(uint32_t iAddress, uint8_t *buf, uint32_t iNbrToWrite) { 26                 /* Unlock the Flash Bank1 Program Erase controller */ 27         volatile FLASH_Status FLASHStatus = FLASH_COMPLETE; 28         uint32_t secpos; 29         uint32_t iNumByteToWrite = iNbrToWrite; 30         uint16_t secoff; 31         uint16_t secremain;   32           uint16_t i = 0;     33         uint8_t tmp[PAGE_SIZE]; 34          35         FLASH_UnlockBank1(); 36         secpos=iAddress & (~(PAGE_SIZE -1 )) ;//ÉÈÇøµØÖ·  37         secoff=iAddress & (PAGE_SIZE -1);     //ÔÚÉÈÇøÄÚµÄÆ«ÒÆ 38         secremain=PAGE_SIZE-secoff;           //ÉÈÇøÊ£Óà¿Õ¼ä´óС  39          40          41         if(iNumByteToWrite<=secremain) secremain = iNumByteToWrite;//²»´óÓÚ4096¸ö×Ö½Ú 42          43         while( 1 ) { 44             Flash_Read(secpos, tmp, PAGE_SIZE);   //¶Á³öÕû¸öÉÈÇø 45             for(i=0;i<secremain;i++) {       //УÑéÊý¾Ý 46                    if(tmp[secoff+i]!=0XFF)break;       //ÐèÒª²Á³ý  47                } 48             if(i<secremain) {  //ÐèÒª²Á³ý 49                 FLASHStatus = FLASH_ErasePage(secpos); //²Á³ýÕâ¸öÉÈÇø 50                 if(FLASHStatus != FLASH_COMPLETE) 51                   return -1; 52                 for(i=0;i<secremain;i++) {   //¸´ÖÆ 53                         tmp[i+secoff]=buf[i];    54                 } 55                 Flash_Write_Without_check(secpos ,tmp ,PAGE_SIZE);//дÈëÕû¸öÉÈÇø   56             } else { 57                 Flash_Write_Without_check(iAddress,buf,secremain);//дÒѾ­²Á³ýÁ˵Ä,Ö±½ÓдÈëÉÈÇøÊ£ÓàÇø¼ä. 58             } 59              60             if(iNumByteToWrite==secremain) //дÈë½áÊøÁË 61                 break; 62             else { 63                 secpos += PAGE_SIZE; 64                 secoff = 0;//Æ«ÒÆλÖÃΪ0  65                 buf += secremain;  //Ö¸ÕëÆ«ÒÆ 66                 iAddress += secremain;//дµØÖ·Æ«ÒÆ     67                 iNumByteToWrite -= secremain;  //×Ö½ÚÊýµÝ¼õ 68                 if(iNumByteToWrite>PAGE_SIZE) secremain=PAGE_SIZE;//ÏÂÒ»¸öÉÈÇø»¹ÊÇд²»Íê 69                 else secremain = iNumByteToWrite;  //ÏÂÒ»¸öÉÈÇø¿ÉÒÔдÍêÁË 70             }   71          }   72         FLASH_LockBank1(); 73         return iNbrToWrite;  74 } 75  76 /** 77   * ´Óij¸öµØÖ·ÇøÓò¶Á³öÊý¾Ý 78   * iAddress ÆðʼµØÖ· buf ´æ·ÅµÄÊý×éÖ¸Õë iNbrToRead ÐèÒª¶Á³öµÄ³¤¶È´óС   79   */ 80 int Flash_Read(uint32_t iAddress, uint8_t *buf, int32_t iNbrToRead) { 81             int i = 0; 82             while(i < iNbrToRead ) { 83                *(buf + i) = *(__IO uint8_t*) iAddress++; 84                i++; 85             } 86             return i; 87 } 88  89 /*******************************************************************************  *  90 Function Name  : SystemReset  91  * Description    : Configures the port pin connected to the push button. GPIO_D_4  92  * Input          : None * Output         : None  93  * Return         : None  ******************************************************** 94  ***********************/  95   __asm void SystemReset(void)  96   {   MOV R0, #1           //;     97   MSR FAULTMASK, R0    //; 清除FAULTMASK 禁止一切中断产生 98   LDR R0, =0xE000ED0C  //;   99   LDR R1, =0x05FA0004  //;    100   STR R1, [R0]         //; 系统软件复位101    } void  downfile(){ uint8_t key = 1; if((mGPSSend.GPSSendBuf[mGPSSend.TailPoint].Buf[0] == '$') &&    (mGPSSend.GPSSendBuf[mGPSSend.TailPoint].Buf[1] == '1')&&(mGPSSend.GPSSendBuf[mGPSSend.TailPoint].Buf[2] == '2') &&(mGPSSend.GPSSendBuf[mGPSSend.TailPoint].Buf[3] == '3') &&(mGPSSend.GPSSendBuf[mGPSSend.TailPoint].Buf[4] == '4') ){ USART_ITConfig(USART3, USART_IT_RXNE, DISABLE);  Flash_Write(IsDownLoadFlagAddress, &key,1); RTC_ITConfig(RTC_IT_SEC, DISABLE); SystemReset(); while(1); }}

 三、IAP具体更新流程

1.正常运行下

2.输入特定标识，进入IAP更新

3.在SecureCRT选择Transfer中Send Ymodem 选择生成的bin文件，Add然后点击OK

传输完成

 更新后，重新启动的程序