Antonio ferrara

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5 years, 4 months ago.

Led blinking

Hi, on my STM32H743 Nucleo-144 but LD1, LD2 and LD3 dont't blink

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1 Answer

Chandrasekhar Dhulipala
5 years, 4 months ago.

Hi Antonio,

The three LEDs (Green, Blue and Red)are connected to PB0, PB7 and PB14 pins on the NUCLEO-144 board and are user LEDs. you have to give high to switch them on and low to switch them off. That's what I got from NUCLEO-144 manual. Refer to the images I attached to this post. Following is the link you can refer for more information.

https://www.st.com/resource/en/user_manual/dm00244518.pdf

/media/uploads/krishnachandrasekhar/nucleo_144_1.png

/media/uploads/krishnachandrasekhar/nucleo_144_2.png

Hope this helps

-Chandrasekhar DVS

Thanks for answer, it's very helpful. But I have noticed another strange behaviour: when I give a high signal to pins Pb7 and Pb14 the LD2 and LD3 leds lit, when I do the same with Pb0 for the LD1 LED it doesn't lit, but LD6 and LD7 switch on! I tryed to make them blink with arduinoIDE and all of them blink properly.

posted by Antonio ferrara 13 Aug 2019

Hi Antonio ferrara,

Once check the SB119 and SB120 if they are as shown in the bottom view of the board or are they reversed. It was implied in the pdf that the LD1 is connected to either PB0 (SB120 ON and SB119 OFF )or PA5 (SB119 ON and SB120 OFF). Also maybe check if the PB0 pin is connected to CN8 pin 9 and CN11 pin 18 as it was mentioned in the pdf that LD6 is on when +5V is given on these pins. About LD7 though, it indicates overcurrent is flowing. Hence I advice you to be careful when that happens.

Glad I could help

posted by Chandrasekhar Dhulipala 14 Aug 2019