Hi,
I'm trying to connect to the G431 on a Nucleo G431 board and ST gives two options.
Using an external debug tool to program and debug the on-board STM32 There are two basic ways to support an external debug tool:
1. Keep the embedded STLINK-V3E running. Power on the STLINK-V3E at first until the COM LED turns red.Then connect the external debug tool through the CN4 STDC14/MIPI-10 debug connector ug
2. Set the embedded STLINK-V3E in high-impedance state: when jumper JP1 (STLK_RST) is ON, the embedded STLINK-V3E is in RESET state and all GPIOs are in high-impedance; then, connect the external debug tool to debug connector CN4.
When I try option #1 it does work but the J-tag see's two devices on the chain, a G431 and an "unknown".
When I try option #2 then +3.3V on the debug (Vt) connector goes away and the J-link then can't connect.
Is the J-Link EDU supplying the 3.3V Vt or is the J-link just sampling that pin? I don't see on the Nucleo board where any 3.3V is generated. They do have a 3.3V_ST-LINK but it does not connect to the +3.3V Vt pin as far as I can tell. Any ideas why Vt goes away?
~thanks
I'm trying to connect to the G431 on a Nucleo G431 board and ST gives two options.
Using an external debug tool to program and debug the on-board STM32 There are two basic ways to support an external debug tool:
1. Keep the embedded STLINK-V3E running. Power on the STLINK-V3E at first until the COM LED turns red.Then connect the external debug tool through the CN4 STDC14/MIPI-10 debug connector ug
2. Set the embedded STLINK-V3E in high-impedance state: when jumper JP1 (STLK_RST) is ON, the embedded STLINK-V3E is in RESET state and all GPIOs are in high-impedance; then, connect the external debug tool to debug connector CN4.
When I try option #1 it does work but the J-tag see's two devices on the chain, a G431 and an "unknown".
When I try option #2 then +3.3V on the debug (Vt) connector goes away and the J-link then can't connect.
Is the J-Link EDU supplying the 3.3V Vt or is the J-link just sampling that pin? I don't see on the Nucleo board where any 3.3V is generated. They do have a 3.3V_ST-LINK but it does not connect to the +3.3V Vt pin as far as I can tell. Any ideas why Vt goes away?
~thanks
The post was edited 1 time, last by btremaine ().