Nucleo F767ZI - Led LD4 RED

[Danilo_]

Hi, 

I'm new to stm32 boards and I'm using it on platformIO with Arduino framework. 
I have problems with the led LD4 (st-link led).

- When I use the USB cable (JP3 jumper on U5V -> powering the board using usb) the power led LD6 is green but the LD4 is red. When I upload the code the LD4 blinks red and then stable red again once flash is completed and nothing happens (in the code I turn on/off led LD1 and print something).

- When I use external power (7.6V battery on VIN, JP3 jumper on VIN) the power led LD6 is green, the LD4 is green as well. Once I upload the code the LD4 blinks red and then stable red again once flash is completed and nothing happens.

- Also, I tried doing the same thing with framework STM32cube but no luck (same behaviour).

Could you help me, what am I doing wrong?

- This is my .ini file:

[env:nucleo_f767zi]

platform = ststm32

board = nucleo_f767zi

framework = arduino

upload_protocol = stlink

debug_tool = stlink

monitor_speed = 115200

build_flags =

-D USE_FULL_ASSERT

-D DEBUG

-D SERIAL_DEBUG

- This is the basic code used:

#include <Arduino.h>

#define LED_PIN PB0  // Default user LED (LD1)

void setup() {
    Serial.begin(115200);
    pinMode(LED_PIN, OUTPUT);
    Serial.println("Setup Complete");
}

void loop() {
    digitalWrite(LED_PIN, HIGH);  // Turn LED on
    delay(500);
    digitalWrite(LED_PIN, LOW);   // Turn LED off
    delay(500);
}

- This is the output after flashing:

Archiving .pio/build/nucleo_f767zi/libFrameworkArduino.a
Indexing .pio/build/nucleo_f767zi/libFrameworkArduino.a
Linking .pio/build/nucleo_f767zi/firmware.elf
Checking size .pio/build/nucleo_f767zi/firmware.elf
Advanced Memory Usage is available via "PlatformIO Home > Project Inspect"
RAM: [ ] 0.3% (used 1332 bytes from 524288 bytes)
Flash: [ ] 1.1% (used 23012 bytes from 2097152 bytes)
Configuring upload protocol...
AVAILABLE: blackmagic, cmsis-dap, jlink, mbed, stlink
CURRENT: upload_protocol = stlink
Uploading .pio/build/nucleo_f767zi/firmware.elf
xPack Open On-Chip Debugger 0.12.0-01004-g9ea7f3d64-dirty (2023-01-30-17:03)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
debug_level: 1

srst_only separate srst_nogate srst_open_drain connect_deassert_srst

[stm32f7x.cpu] halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0x08004534 msp: 0x20080000
** Programming Started **
** Programming Finished **
** Verify Started **
** Verified OK **
** Resetting Target **
shutdown command invoked

[Andrew Neil]

---

@Danilo_ wrote:

 with Arduino framework. 

---

For Arduino questions, you should go here:

https://www.stm32duino.com/

Or the Arduino forums

[Danilo_]

Hi Andrew, 

The problem arises even when I use stm32cube as framework. 
I don't think it's a frawework related issue. 
I'll post my question on the link recommend by you. 
Thanks!

[mƎALLEm]

Hello @Danilo_ and welcome to the community;

Since you are using an external power supply, I suggest you to refer to the UM1974 / Section 6.4 Power supply and power selection.