STM32 USB DFU firmware upgrade must read

Upgrade code engineering instructions

After the project is created, the following steps need to be performed:

1. First, click on the compiler's "Target Option" , then select the Target option, set IROM1 under on-chip in the "Read/Only Memory Areas" field, and modify the download start address and size. Here we use the address 0x0800500:

2. Next, we need to remap the interrupt vector table to the code we started with at the beginning of the program, that is, add the following sentence at the beginning of the main() function: NVIC_SetVectorTable(0x08005000, 0x0); 

DFU File Manager Instructions

Next, we need to create the upgrade file. Click the DFU File Manager software, and the following interface will appear:

We select the first one: I want to GENERATE a DFU file from S19, Hex Or Bin”, then the following popup will appear:

We modify VID to 0483, PID to DF11, and Version to 0100 or 0200, which is the same as the USB DFU project settings. Click "S19 or Hex..." to select the hex file to be generated by the project code upgrade. In the edit box to the right of "Target" in the "Injection" field, set the number. For example, in our USB DFU project, we set the Internal flash number to 00, so set it to 0 here, and then click "General" to save it as a dfu file.

DfuSe Demostration User Manual

After downloading the USB DFU program to the development board, press the button to enter the upgrade mode. Then the DfuSe Demostration interface will appear as follows:

In the upper left corner of the software, "STM32 Device in DFU Mode" will appear. Then, in the upper right corner of the DFU Mode field, the PID and VID of the USB device will be displayed. From the figure, we can see that the VID is 0483 and the PID is DF11. These two VIDs are fixed and must be 0483. The PID can be customized. If you want to use the USB DFU function, you must set these two numbers. In the "Action Select" field, our storage device will appear, which will display: number, name and number of available sectors. If we use Internal Flash, the above interface will appear. Next, we need to click the "choose" button in the "Upgrade or Verify Action" field, select the .dfu file made before, and check the "Verify after downl" option, and then click the "upgrade" button. If successful, the words "Target00: Verify successful" will appear.