Custom board

[harry123]

https://drive.google.com/file/d/1r9MhSFT5c7hjDf6kfRWHOomkzLH9iJMF/view?usp=drivesdk Hi Everyone 

I made a custom board keeping stm32f429 disc1 board as a reference.

When I connect the the board through usb mini it's showing USB not recognised. Below is my stlink schematic.

[Imen.D]

Hello @harry123 ,

Try to change USB cable (Do not use cables for charger phones).

[TDK]

So you're connected CN3? Until you load something on the board, the USB port won't be recognized as anything. You need to program it to behave as you want it to.

Note that a direct USB connection isn't a programmer. You still need a programmer such as STLINK-V3MINIE to debug it.

[harry123]

How can i program the Stlink IC 

I want my custom board to work as disc board.

 

[TDK]

A few problems with that:

• Your board doesn't have an st-link chip on it.
• Even if it did, the st-link firmware is not published.

 

The best way to develop a custom board is to buy a programmer (such as STLINK-V3MINIE), put a 14-pin SWD header on your board, and connect to it via that header to program/debug.

[harry123]

As I developed my board as it is like disc1 board schematic , can I program my custom board with external debugger (stlinkv3minie).

Or my board is useless.

 

[TDK]

Sorry, I misinterpreted the situation a little bit. It sounds like you have both an STM32F4xx chip on the board as well as the STM32F103 chip you show in the schematic. In that case, your board won't run the same as a discovery board since the F103 doesn't have firmware (as stated earlier). The firmware isn't published. But:

You can still program the STM32F4xx chip on that board, but it will take a little more work. You can probably leave the STM32F103 chip on the board but it won't do anything. To program the STM32F4xx chip with an external debugger, connect the GND/SWDIO/SWCLK/NRST/VCC pins from the debugger to the board and it will show up in STM32CubeProgrammer and you can connect to and program it. You can use CN3 for these connections. The board will also need to be powered separately, such as by the USB.

(Soldering an STM32F103 chip with the firmware already on it is also an option, but at that point why not just use the discovery board you got the chip from.)

[oeliks]

I would resolder this chip from nucleo for a fast temporary solution, if you dont plan to make more boards and use only this one.

 

But as was mentioned, its better to use external programmer for programming chip and on chip usb to communicate.

[harry123]

As my code is developed in stm32f429 disc1 board can I replace that IC with my new custom board will it work. 

Or is there any solution below is my board.

Below is my board schematic https://drive.google.com/file/d/1rJiLHR7v1m0_u9aUBMIOs7mpG5s_3u-o/view?usp=drivesdk