When attempting to connect and flash an STM32F407G-DISC1 board with STM32CubeProgrammer via the default ROM USART1 interface on pins PA9 (TX) an

[amaljishnu7]

When attempting to connect and flash an STM32F407G-DISC1 board with STM32CubeProgrammer via the default ROM USART1 interface on pins PA9 (TX) and PA10 (RX), the connection consistently fails with a timeout error:

 

text

 

 

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

This failure occurs despite proper boot pin configuration (BOOT0 = 3.3V, BOOT1/PB2 = GND) and correct UART settings (Even parity, 8 data bits). In contrast, using PB10 / PB11 (USART3) succeeds immediately.

 

2. Test Configuration & Environment

Target Device: STM32F407VGT6 (LQFP100 package on STM32F407G-DISC1 board)

Programming Tool: STM32CubeProgrammer (UART Interface mode)

Serial Bridge: USB-to-UART Adapter (CP2102)

Target Pins Tested:

PA9 (STM32 USART1_TX 

→

→ Adapter RX)

PA10 (STM32 USART1_RX 

←

← Adapter TX)

GND (Common ground)

Boot Configuration: BOOT0 = 3.3V, PB2 (BOOT1) = GND

Port Settings Tested: Baudrates: 9600, 57600, 115200 | Parity: Even | Stop bits: 1

[KDJEM.1]

Hello ​@amaljishnu7 and welcome to the community;

 

Could you please check the status of LD7. According to Discovery kit with STM32F407VG MCU - User manual, the green LED indicates when VBUS is present on CN5 and is connected to PA9 of the STM32F407VGT6.

 

Thank you.

Kaouthar