![]() Removing the NRST solder bridge would presumably disable use of STLINK. I think this is the best solution, as the STLINK should still be operational for programming and debugging. This might also explain why one respondent had success by connecting 5V to both VIN and 5V pins. It would have been better to power the STLINK from the 5V node, as then STLINK would be brought up with either 5V Nano pin or voltage on VIN. The problem is, with 5V on the Nano pin, there is no 5V on the STLINK. There is a diode between E5V and 5V, so that it possible to connect 5V to the Nano 5V pin without pushing voltage back on the regulator output. E5V is upstream from the 5V node (on the Nano pin). ![]() I gather this is because it is driven by the STLINK MCU, which is only powered from the VIN regulator's 5V, called E5V on the schematic. I scoped the reset line and found that, with external power on the 5V Nano pin, it was bouncing around randomly. I have been trying a few things, looking for a solution to this same problem. How can I power the NUCLEO with an external source connected to pin +5V? There seems to be contradictory guidelines to power the NUCLEO with external sources so, before unsoldering SB9 and SB14 my question is: However, there is an interesting discussion in where the user J Roth defends that it is necessary to configure SB9 = OFF for a similar NUCLEO Board to input power through pin +5V. I know that I have to open bridges SB14 and SB9 when using a 3.3 V external source, but nothing is said in the case of the input through +5V. Unfortunately, no program runs when powering the NUCLEO-L432KC using this pin. The user manual ( ) states clearly in Table 4 that it is possible to use pin 4: +5V, connected to an external source and the ST-LINK won't be powered. ![]() The idea is to disable ST-LINK to minimize the power consumption. I would like to connect a NUCLEO-L432KC to an external source through pin +5V. Powering a NUCLEO-L432KC with an external source To start a new conversationĦ years, 2 months ago. Nucleo-L432KC has 2 SPI (SPI1 and SPI3) and so I tried to configure both of them, but SCLK output as a master didnt work. Then, the board should work as a SPI slave and a SPI master at the same time. ![]() Important changes to forums and questionsĪll forums and questions are now archived. In that project, the mbed board (Nucleo-L432KC) has to receive data from a SPI master, and send processed data to another device as a SPI master. ![]()
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