最近使用STM32F429的USB_OTG_FS做了一个BOOTLOADER可通过USB(PA11,PA12)读取U盘中的文件或者UART二选一更新APP。UART升级一切正常,唯有USB升级有个小问题:升级过程都一切顺利,但是到了要跳转到APP时芯片先是背光驱动IO无输出或输出低电平(其它IO状态未知,怀疑和背光驱动IO相似)等了几秒后芯片复位,复位后也能正常进入APP。但就是复位之前那段时间要等好几秒不明白是什么原因。如果是HardFault异常中断,我的看门狗没有使能,芯片没理由复位啊?这个问题无法仿真,因为一旦芯片复位仿真器就与芯片失去同步了。我通过将代码一段一段注释排除发现:如将"USBH_Process(&USB_OTG_Core, &USB_Host);"函数及所在的循环注释就不会发生复位问题跳转APP正常,求高人解惑。
U盘升级函数:
- /*
- *********************************************************************************************************
- * Function Name : Programing_From_Flie
- * Function Detail : Programing The Chip From a Flie
- * Paramater : None
- * Return Value : None
- *********************************************************************************************************
- */
- void Programing_From_Flie(void)
- {
- static uint8_t page_buffer[4096];
- #if defined BK180H
- const char object_path[]="0:BK180H.bin";
- #elif defined BK300H
- const char object_path[]="0:BK300H.bin";
- #elif defined U180
- const char object_path[]="0:U180.bin";
- #endif
- PrintMessage("Udisk Connected!");
- SysTick_Init();
- do
- {
- USBH_Process(&USB_OTG_Core, &USB_Host);
- }
- while (count_ms<8000 && (USB_Host.gState!=HOST_CLASS || USBH_MSC_BOTXferParam.MSCState!=0x05));
- SysTick->CTRL=0x00; //Stop Counter
- char string_buf[24]="Scanning for ";
- for (u8 i=13;i<24;i++)string_buf=object_path[i-11];
- PrintMessage(string_buf);
- result = f_mount(&fs,"0:",1); /* Mount a logical drive */
- if (result != FR_OK)
- {
- PrintMessage("Mounting Failed!");
- return;
- }
- result = f_open(&file, object_path, FA_OPEN_EXISTING | FA_READ);
- if(result == FR_OK)
- {
- if (file.fsize==0 || file.fsize>0x1F8000)
- {
- PrintMessage("File Size Error!");
- goto close_file_exit;
- }
- if (FLASH_If_GetWriteProtectionStatus() == 0)
- {
- /* Disable the write protection */
- if (FLASH_If_DisableWriteProtection()==1)
- {
- PrintMessage("Write Protection disabled!");
- }
- else
- {
- PrintMessage("Error: Flash write unprotection failed!");
- goto close_file_exit;
- }
- }
-
- PrintMessage("Chip Erassing");
- FLASH_If_Erase(APPLICATION_ADDRESS,file.fsize);
- PrintMessage("Chip Programming");
-
- uint32_t flashdestination = APPLICATION_ADDRESS;
- uint32_t packets_max = file.fsize/4096+(file.fsize%4096==0?0:1);
- for (uint32_t packets_readed=0;packets_readed<packets_max;packets_readed++)
- {
- result = f_read(&file, page_buffer, sizeof(page_buffer), &fnum);
- if(result==FR_OK)
- {
- /* Write received data in Flash */
- if (FLASH_If_Write(&flashdestination, (uint32_t *) page_buffer, (fnum+3)/4) == 0)
- {
- ShowProgressPercent((packets_readed+1)*100/packets_max);
- }
- else /* An error occurred while writing to Flash memory */
- {
- /* End session */
- PrintMessage("An error occurred while writing to Flash memory");
- PrintMessage("End session");
- goto close_file_exit;
- }
- }
- else
- {
- PrintMessage("Error File Reading!");
- goto close_file_exit;
- }
- }
- f_close(&file);
- PrintMessage("Going to the new APP within Seconds...");
- SysTick_Init();
- for (uint8_t i=5;i!=0;i--)
- {
- count_ms = 0;
- LCD_Show8x16sym(272-lcd_x*16,(lcd_y[lcd_x]-12)*8,i+'0',WHITE,BLACK);
- while (count_ms<1000);
- }
- SysTick->CTRL=0x00; //Stop Counter
- //跳转APP代码
- /* Test if user code is programmed starting from address "APPLICATION_ADDRESS" */
- if (((*(__IO uint32_t*)APPLICATION_ADDRESS) & 0x2FFE0000 ) == 0x20000000)
- {
- __asm("CPSID I");__asm("CPSID F");
- USBH_DeInit(&USB_OTG_Core,&USB_Host);
- /* Jump to user application */
- JumpAddress = *(__IO uint32_t*) (APPLICATION_ADDRESS + 4);
- Jump_To_Application = (pFunction) JumpAddress;
- /* Initialize user application's Stack Pointer */
- __set_PSP(*(__IO uint32_t*) APPLICATION_ADDRESS);
- __set_CONTROL(0);
- __set_MSP(*(__IO uint32_t*) APPLICATION_ADDRESS);
- Jump_To_Application();
- //APP跳转代码结束
- }
- }
- else
- {
- PrintMessage("Error File Opening!");
- }
- close_file_exit:
- f_close(&file);
- }
复制代码
另外说明下,APP中未用到USB功能并且我在跳转前也关闭了中断的,不知为何还是会发生异常。
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感谢兄台的热情回复,好巧不巧就在几分钟前我刚把问题解决了,办法就是在跳转APP前把USB的外设时钟关闭:RCC_AHB2PeriphClockCmd( RCC_AHB2Periph_OTG_FS, DISABLE) ;就不会有跳转异常的问题发生了。我怀疑原因可能是USB中断在BOOTLOADER中打开之后,跳至APP时并没有使用USB功能因此没有设置USB中断入口从而导致中断溢出,保险起见以后在跳转APP前应将所有使能的外设全部关闭。
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我看了一下例程里面的USBH_DeInit函数,里面并没有禁用中断这个操作,在发现关闭时钟这个办法之前我其实也试过跳转前调用USBH_DeInit函数,然并卵。我感觉只要断了USB的时钟量她有通天的本事也不能再兴风作浪了。所以也就懒得去改USBH_DeInit函数了。
原来时钟关了后,她还真的有通天的本事!
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