stm32的串口编程.pdf

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1、October 2010Doc ID 13588 Rev 81/16AN2557Application noteSTM32F10 x in-application programmingusing the USARTIntroductionAn important requirement for most Flash-memory-based systems is the ability to update firmware when installed in the end product.This ability is referred to as in-application progr

2、amming(IAP).The purpose of this application note is to provide general guidelines for creating an IAP application.The STM32100B-EVAL,STM32100E-EVAL,STM3210B-EVAL,STM3210E-EVAL and STM3210C-EVAL boards were used to validate the IAP driver.The STM32F10 x microcontroller can run user-specific firmware

3、to perform IAP of the microcontroller-embedded Flash memory.This feature allows the use of any type of communication protocol for the reprogramming process(such as CAN,USART,USB).USART is the example used in this application ContentsAN25572/16Doc ID 13588 Rev 8Contents1IAP overview .51.1Principle.51

4、.2IAP driver description.52Running the IAP driver.82.1HyperTerminal configuration .82.2Executing the IAP driver.93IAP driver menu.103.1Download image to the internal Flash memory .103.2Upload image from the internal Flash memory .113.3Execute the new program.113.4Disabling the write protection.114ST

5、M32F10 x IAP implementation summary.125User program conditions .146Revision history .15AN2557List of tablesDoc ID 13588 Rev 83/16List of tablesTable 1.STM32F10 xxx IAP implementation .12Table 2.Revision history .15List of figuresAN25574/16Doc ID 13588 Rev 8List of figuresFigure 1.Flowchart of the IA

6、P driver.7Figure 2.COM port properties.8Figure 3.IAP Driver menu when the STM32F10 x Flash memory is not protected.10Figure 4.IAP driver menu when the STM32F10 x Flash memory is write-protected.11Figure 5.Flash memory usage .14AN2557IAP overviewDoc ID 13588 Rev 85/161 IAP overviewLow-density devices

7、 are STM32F101xx,STM32F102xx,and STM32F103xx microcontrollers where the Flash memory density ranges between 16 and 32 Kbytes.Medium-density devices are STM32F101xx,STM32F102xx,and STM32F103xx microcontrollers where the Flash memory density ranges between 64 and 128 Kbytes.High-density devices are ST

8、M32F101xx and STM32F103xx microcontrollers where the Flash memory density ranges between 256 and 512 Kbytes.High-density devices are implemented in the STMicroelectronics STM3210E-EVAL evaluation board.Connectivity line devices are STM32F105xx and STM32F107xx microcontrollers.Connectivity line devic

9、es are implemented in the STMicroelectronics STM32100C-EVAL evaluation board.Low-density value line devices are STM32F100 x4 and STM32F100 x6 microcontrollers where the Flash memory density ranges between 16 and 32 Kbytes.Medium-density value line devices are STM32F100 x8 and STM32F100 xB microcontr

10、ollers where the Flash memory density ranges between 64 and 128 Kbytes.Medium-density value line devices are implemented in the STMicroelectronics STM32100B-EVAL evaluation board.XL-density devices are STM32F101xx and STM32F103xx microcontrollers where the Flash memory density ranges between 768 Kby

11、tes and 1 Mbyte.High-density value line devices are STM32F100 xC,STM32F100 xD and STM32F100 xE microcontrollers where the Flash memory density ranges between 256 and 512 Kbytes.High-density value line devices are implemented in the STMicroelectronics STM32100E-EVAL evaluation board.1.1 PrincipleYou

12、should program the IAP driver to the Flash memory base address via the JTAG/SWD interface using the development toolchain of your choice or the factory-embedded boot loader in the System memory area.The IAP driver uses the USART to:Download a binary file from the HyperTerminal to the STM32F10 xs int

13、ernal Flash memory.Upload the STM32F10 xs internal flash memory content(starting from the defined user application address)into a binary file.Execute the user program.1.2 IAP driver descriptionThe IAP driver contains the following set of source files:main.c:where the USART initialization is set.A ma

14、in menu is then executed from the common.c mon.c:contains display functions and the main menu routine.The main menu gives the options of loading a new binary file,uploading a new binary file,executing the IAP overviewAN25576/16Doc ID 13588 Rev 8binary file already loaded and disabling the write prot

15、ection of the pages where the user loads his binary file(if they are write-protected).ymodem.c and download.c:they are used to receive the data from the HyperTerminal application(using the YMODEM protocol(a),and then to load them into the STM32F10 xs internal RAM.In the event of a failure when recei

16、ving the data,the“Failed to receive the file”error message is displayed.If the data is received successfully,it is programmed into the internal Flash memory from the appropriate address.A comparison between internal RAM contents and internal Flash memory contents is performed to check the data integ

17、rity.If there is any data discrepancy,the“Verification failed”error message is displayed.Other error messages are also displayed when the image file size is greater than the allowed memory space and when the user aborts the task.upload.c:it is used to transmit the STM32F10 xxx internal Flash memory

18、content started from the user application address using the ymodem protocol.STM32F10 x Standard Peripherals Library.To select the STMicroelectronics evaluation board STM32100B-EVAL(Medium density value line devices),STM3210C-EVAL(Connectivity line devices),STM3210E-EVAL(High density devices),STM3210

19、0E-EVAL(High-density value line devices)or STM3210B-EVAL(Medium-density devices)used to run the IAP,uncomment the corresponding line in stm32_eval.h file(under UtilitiesSTM32_EVAL)/#define USE_STM32100B_EVAL/#define USE_STM3210B_EVAL/#define USE_STM3210E_EVAL/#define USE_STM3210C_EVAL/#define USE_ST

20、M32100E_EVALThe user can choose to either go to the user application or execute the IAP for reprogramming purposes by pressing a push-button connected to a pin.Not pressing the push-button at reset switches to the user applicationPressing the push-button at reset displays the IAP main menuRefer to T

21、able 1.:STM32F10 xxx IAP implementation for more details about the STM32100B-EVAL,STM3210B-EVAL,STM3210E-EVAL,STM3210C-EVAL and STM32100E-EVAL board push-button used to enter the IAP mode.The IAP flowchart is represented in Figure 1.a.The Ymodem protocol sends data in 1024-byte blocks.An error check

22、 is performed in data blocks transmitted to the STM32F10 xxxs internal RAM to compare the transmitted and received data.Blocks unsuccessfully received are acknowledged with an NAK(Negative Acknowledgement).For more details about the Ymodem protocol,refer to existing documentation.AN2557IAP overviewD

23、oc ID 13588 Rev 87/16Figure 1.Flowchart of the IAP driver?Running the IAP driverAN25578/16Doc ID 13588 Rev 82 Running the IAP driverThe IAP driver is programmed in Flash memory:From page 0 to page 11 on Low-density devices,Medium-density devices,Low-density value line devices,and Medium-density valu

24、e line devices.From page 0 to page 5 on High-density,Connectivity line,XL density devices and High-density value line device.The user application occupies the remaining memory space.2.1 HyperTerminal configurationTo use the IAP,the user must have a PC running HyperTerminal or other Terminal program

25、that supports ymodem protocol as shown in Figure 2.In this document the HyperTerminal is used.The following figure shows the HyperTerminal configuration.Figure 2.COM port propertiesNote:The baud rate value of 115200 bps is used as an example.Care must be taken when selecting the system clock frequen

26、cy.To guarantee successful communication via the USART,the system clock frequency in the end application must be such that a baud rate equal to 115200 bps can be generated.AN2557Running the IAP driverDoc ID 13588 Rev 89/162.2 Executing the IAP driverAs an example in this application note,pressing th

27、e pin connected to the push-button allows the IAP driver to run.By pressing the push-button at reset,the user can run the IAP driver to reprogram the STM32F10 xs internal Flash memory.It is not mandatory to use the push-button;the user can apply a signal to this pin with respect to its active level.

28、Refer to Table 1.:STM32F10 xxx IAP implementation.IAP driver menuAN255710/16Doc ID 13588 Rev 83 IAP driver menuRunning the IAP displays the following menu in the HyperTerminal window.Figure 3.IAP Driver menu when the STM32F10 x Flash memory is not protected3.1 Download image to the internal Flash me

29、moryTo download a binary file via HyperTerminal to the STM32F10 xs internal Flash memory,do as follows:1.Press 1 on the keyboard to select the Download Image To the STM32F10 x Internal Flash menu2.Select Send File in the Transfer menu3.In the Filename field,type the name and the path of the binary f

30、ile you want to download4.From the protocol list,select the Ymodem protocol5.Click on the Send buttonAs a result,the IAP driver loads the binary file into the STM32F10 xs internal Flash memory from the defined base address and displays the binary file name and size in the HyperTerminal window.AN2557

31、IAP driver menuDoc ID 13588 Rev 811/163.2 Upload image from the internal Flash memoryTo upload a copy of the internal Flash memory started from the user application address,do as follows:1.Press 2 on the keyboard to select Upload image from the STM32F10 x internal Flash menu.2.Select Receive File in

32、 the Transfer menu.3.Choose the directory of the binary file you want to create.4.From the protocol list,select the Ymodem protocol.5.Click on the Receive button.3.3 Execute the new programOnce the new program has been loaded,press 3 on the keyboard to select the Execute The New Program menu and exe

33、cute the code.3.4 Disabling the write protectionWhen the IAP starts,it checks the Flash memory pages where the user program is to be loaded to see if any are write-protected.If it is the case,the menu shown in Figure 4 appears.Figure 4.IAP driver menu when the STM32F10 x Flash memory is write-protec

34、tedPrior to downloading the new program,the write protection must be disabled.To do so,press 4(Disable the write protection)on the keyboard.The write protection is disabled and a system reset is generated to reload the new option byte values.After resuming from reset,the menu shown in Figure 3 is di

35、splayed if the key push-button is pressed.Note:In this application,the read protection is not supported,so the user has to verify that the Flash memory is not read-protected.STM32F10 x IAP implementation summaryAN255712/16Doc ID 13588 Rev 84 STM32F10 x IAP implementation summaryTable 1 provides a su

36、mmary of the STM32F10 x IAP implementation.Table 1.STM32F10 xxx IAP implementationFirmwareHardwareThe IAP program is located at 0 x8000000.The Flash routines(program/erase)are executed from the Flash memory.The size of this program is about 12 Kbytes and programmed on:The user application(image to b

37、e loaded with the IAP)will be programmed starting from address 0 x8003000(1).The maximum size of the image to be loaded is:The image is uploaded with the IAP from the STM32F10 xxx internal Flash.The maximum size of the image to be uploaded is:Push-button(active level:low)USART usedMedium-densitydevi

38、ces(STM3210B-EVAL)page 0 to page 11116 Kbytes(page 12-page 127)116 Kbytes(page 12-page 127)Key pushbuttonconnected topin PB.09USART1High-density devices(STM3210E-EVAL)page 0 to page 5500 Kbytes(page 6-page 255)500 Kbytes(page 6-page 255)Key pushbuttonconnected topin PG.08USART1Connectivity linedevic

39、es(STM3210C-EVAL)page 0 to page 5244 Kbytes(page 6-page 127)244 Kbytes(page 6-page 127)Key pushbuttonconnected topin PB.09USART2(Tx/Rx pinsremapped)Medium-densityvalue line devices(STM32100B-EVAL)page 0 to page 11116 Kbytes(page 12-page 127)116 Kbytes(page 12-page 127)Key pushbuttonconnected topin P

40、B.09USART1XL-density devices(STM3210E-EVAL)page 0 to page 51012 Kbytes(page 6-page 512)1012 Kbytes(page 6-page 512)Key pushbuttonconnected topin PG.08USART1High-density valueline devices(STM32100E-EVAL)page 0 to page 5500 Kbytes(page 6-page 255)500 Kbytes(page 6-page 255)Key pushbuttonconnected topi

41、n PG.08USART11.User application location address is defined in the common.h file as:#define ApplicationAddress 0 x8003000.To modify it,change the default value to the desired one.In the previous version of the IAP implementation,the ApplicationAddress was 0 x8002000.It has been changed to 0 x8003000

42、 due the additional code(1 KBytes)needed to support the for IAP upload feature.AN2557STM32F10 x IAP implementation summaryDoc ID 13588 Rev 813/16The STM32F10 xxx IAP package comes with:Source files and pre-configured projects for the IAP program(under ProjectIAP directory)Source files and pre-config

43、ured projects that build the application to be loaded into Flash memory using the IAP(under ProjectIAPbinary_template directory).The readme.txt files provided within this package describes step by step how to execute this IAP application.User program conditionsAN255714/16Doc ID 13588 Rev 85 User pro

44、gram conditionsThe user application to be loaded into the Flash memory using IAP should be built withthese configuration settings:1.Set the program load address at 0 x08003000,using your toolchain linker file2.Relocate the vector table at address 0 x08003000,using the NVIC_SetVectorTablefunction or

45、the VECT_TAB_OFFSET definition inside the system_stm32f10 x.cAn example application program to be loaded with the IAP application is provided withpreconfigured projects.Figure 5.Flash memory usage1.Top Flash memory address is equal to/0 x0800 7FFF for Low-density and Low-density value line devices0

46、x0801 FFFF for Medium-density and Medium-density value line devices0 x0803 FFFF for Connectivity Line devices0 x0807 FFFF for High-density and High-density value line devices.0 x080F FFFF for XL-density devices?AN2557Revision historyDoc ID 13588 Rev 815/166 Revision history Table 2.Revision historyD

47、ateRevisionChanges05-Jun-20071Initial release.05-Oct-20072The IAP driver can also be programmed from the SWD interface(see Section 1.1:Principle).Modified:Figure 3:IAP Driver menu when the STM32F10 x Flash memory is not protected Figure 4:IAP driver menu when the STM32F10 x Flash memory is write-pro

48、tected Figure 6:IAP driver directory structure.Flash routines modified in Table 1.:STM32F10 xxx IAP implementation.Section 5:User program conditions updated.Section 7:How to use the IAP driver modified,RIDE project added.30-May-20083Application note updated to apply to High-density devices(implement

49、ed on the STM3210E-EVAL evaluation board).Small text changes.Figure 1:Flowchart of the IAP driver on page 7 corrected.13-Jun-20084Figure 6:IAP driver directory structure modified.31-Jul-20095Updated for connectivity line devices.28-May-20106Introduction:added STM32100B-EVAL evaluation board.Section

50、1:IAP overview:added low-density value line and medium-density value line devices;updated list of devices for medium density devices and connectivity line devices;added XL-density line devices.Section 1.2:IAP driver description:updated section for addition of STM32100B-EVAL evaluation board.Section