How to program a nucle boat (L053R8) using UART?

[AVals.1]

hey,

I went through all possible data sheets I could find did all the required things but my Nucleo still won’t be programmed with uart.

I have put boot0 on VDD pin next to it. For confirmation I also put PB2 (nboot1) on ground next to it.

I tried powering the nucleo through both the USB as well as an external supply (E5V) and switched to e5v.

I reset the controller to try programming.

I connected my Rx, Tx and Ground of my UART to usb (which I checked with the nucleo by programming a UART program through st link and it works)

I am using St flash which says there was no communication

and stm32 programmer says it timed out for the com port

i even checked that there was no read or write protection enabled and nboot1 option bits are correct by connecting to stm32 programmer through STlink

what am I missing?

[Peter BENSCH]

Welcome, @AVals.1​, to the community!

via which USART of the STM32L053R8 did you try to establish the connection?

> I connected my Rx, Tx and Ground of my UART to usb

This description is not clear: Which UART is connected to where or which USB?

Regards

/Peter

[AVals.1]

I'm using an FTDI, connected the Rx, Tx to the USART1 (PA9, PA10) and Gnd from FTDI to the Gnd of Nucleo

[Peter BENSCH]

OK, I also had almost exactly this combination (well, using a CH340 bridge) a few months ago and was able to access the NUCLEO-L053R8 via STM32CubeProg after a reset without any problems. However, I don't currently know when I will find the time to pick out the NUCLEO again to test it again.

Regards

/Peter

[AVals.1]

Thanks so much for the reply!

Could you let me know YOUR procedure for flashing the STM32L053 nucleo? What tools you used (ST Flash demo or STM32Cube Programmer) ? Did you have to change the internal bootloader, or any settings via ST-Link? What other pin connections did you require? and how did you power up the Nucleo?

[AVals.1]

Thanks so much for the reply!

Could you let me know YOUR procedure for flashing the STM32L053 nucleo? What tools you used (ST Flash demo or STM32Cube Programmer) ? Did you have to change the internal bootloader, or any settings via ST-Link? What other pin connections did you require? and how did you power up the Nucleo?

[Peter BENSCH]

As already mentioned, I used the STM32CubeProg.

The internal bootloader cannot be changed or altered because it is hard programmed.

With the STM32CubeProg, I changed the connection option (light blue button to the left of Connect) from ST-Link to UART, 115200, even parity. Perhaps the parity is already set incorrectly because Parity None is very often used. See AN2606 for a detailed description of the bootlader.

I have supplied the NUCLEO via USB.

Regards

/Peter

[AVals.1]

Thanks! I have the same connections and the exact same settings for the STM32Cube programmer as well

But I get this error

"Error: Activating device: KO. Please, verify the boot mode configuration and check the serial port configuration. Reset your device then try again..."

My uart connections are correct

I have put a jumper between boot0 and vdd (CN7 - 5, 7)

I reset and try again and get the same error

How are you powering the Nucleo?