Hello,
Our cube orange plus recently stopped working with a constant red light and a pulsing green light. After reading other similar posts, we tried to connect with an st-link v2 to the cube. Unfortunately, our board doesn’t expose the FMU_SWDIO and the FMU_SWCLK pins so we made a really simple pcb that exposes those 2 pins along with the two gnd pins to check that the numbering of the pins is correct (it is) and pin 26 (IO_VDD_3V3) to power the board. We connected gnd vdd and the two FMU pins to the st-linkv2 and the cube powers on but again with a constant red light and a pulsing green light. ST Programmer sees the st-link but when we try to connect we get an error: No STM32 target found!
The ST-Link works fine with other devices and the cables also. The pcb should also work fine as we can power the cube and the two gnd that we expose are connected in the cube. Unfortunately, I don’t see a way to check if we correctly exposed FMU_SWDIO and FMU_SWCLK but I am fairly confident that they are since all the other pins are correct.
Is there anything we are missing?
Are different settings required here? We tried different Modes and reset modes but maybe there is a very specific combination needed?
This is taking up precious development time and any help is greatly appreciated!