Problem NUCLEO-STM32U031R8

[jhohannfabian]

Hi, I'm testing a Nucleo-STM32U031R8 board. I'm trying to make a simple blink function with its internal LED. I compile and program it without problems, but it doesn't work. I did the same experiment with the ST IDE and it works fine, but with Arduino, I can't get it to show any activity.

void setup() {
// Forzamos la configuración del pin PA5 como salida digital
// usando la nomenclatura de Arduino para STM32
pinMode(PA5, OUTPUT);
}

void loop() {
// Intentamos encenderlo de dos formas distintas
digitalWrite(PA5, HIGH);
delay(200);
digitalWrite(PA5, LOW);
delay(200);
}

result:

Compiling 'PruebaSTM32U' for 'Generic STM32U0 series (STMicroelectronics_GenU0)'

Program size: 11476 bytes (used 4% of a 262144 byte maximum) (14,49 secs)
Minimum Memory Usage: 1208 bytes (3% of a 40960 byte maximum)

Uploading 'PruebaSTM32U' to 'Generic STM32U0 series (STMicroelectronics_GenU0)' using 'COM64'
Uploader started for board Generic STM32U0 series (STMicroelectronics_GenU0)
Upload method will be: bootloader
Uploading via Bootloader
C:\Users\Gerencia Ingetronik\AppData\Local\arduino15\packages\STMicroelectronics\tools\STM32Tools\2.4.0\win\busybox.exe sh "C:\Users\Gerencia Ingetronik\AppData\Local\arduino15\packages\STMicroelectronics\tools\STM32Tools\2.4.0/stm32CubeProg.sh" -i swd -f "C:\Users\Gerencia Ingetronik\AppData\Local\Temp\VMBuilds\PruebaSTM32U\STMicroelectronics_GenU0\Release/PruebaSTM32U.ino.bin" -o 0x0 -a 0x8000000 -m UR -s 0x8000000
Selected interface: swd

STM32CubeProgrammer v2.17.0

ST-LINK SN : 0668FF3833554B3043131139
ST-LINK FW : V2J46M33
Board : NUCLEO-U031R8
Voltage : 3.22V
SWD freq : 4000 KHz
Connect mode: Under Reset
Reset mode : Hardware reset
Device ID : 0x459
Revision ID : Rev A
Device name : STM32U0xx
Flash size : 64 KBytes (default)
Device type : MCU
Device CPU : Cortex-M0+
BL Version : 0xA
Memory Programming ...
Opening and parsing file: PruebaSTM32U.ino.bin
File : PruebaSTM32U.ino.bin
Size : 11.42 KB
Address : 0x08000000
Erasing memory corresponding to segment 0:
Erasing internal memory sectors [0 5]
Download in Progress:
File download complete
Time elapsed during download operation: 00:00:00.482
The upload process has finished.
RUNNING Program ...
Address: : 0x8000000
Application is running, Please Hold on...
Start operation achieved successfully

[fpistm]

This board nor the MCU are supported by the core.
Only the Nucleo U083RC is supported and those generic: U073C(8-B-C)(T-U)_U083CC(T-U)

So if you used one of these target I'm not surprised it does not work.

[jhohannfabian]

Look, I kept trying and managed to get the Blink and Serial printing working for the Generic_STM32U031R8. I'll leave a copy of the files and their organization so someone else can use them.
U031R(6-8)(I-T).zip
Path:

And don't forget to add the board to the board file.

Add this:

Generic U031R8Tx

GenU0.menu.pnum.GENERIC_U031R8TX=Generic U031R8Tx
GenU0.menu.pnum.GENERIC_U031R8TX.upload.maximum_size=65536
GenU0.menu.pnum.GENERIC_U031R8TX.upload.maximum_data_size=12288
GenU0.menu.pnum.GENERIC_U031R8TX.build.board=GENERIC_U031R8TX
GenU0.menu.pnum.GENERIC_U031R8TX.build.product_line=STM32U031xx
GenU0.menu.pnum.GENERIC_U031R8TX.build.variant=STM32U0xx/U031R(6-8)(I-T)
GenU0.menu.pnum.GENERIC_U031R8TX.debug.svd_file={runtime.tools.STM32_SVD.path}/svd/STM32U0xx/STM32U031.svd
Saving, testing:
`#include <Arduino.h>
// Añade esto al principio de tu sketch
//HardwareSerial SerialLP(PA3, PA2); // RX, TX
#define LED_BUILTIN PA5
void setup() {
// Usa SerialLP en lugar de Serial si el normal no funciona
//SerialLP.begin(115200);
Serial.begin(115200);
pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
//SerialLP.println("Hola desde Nucleo U031R8 por pines PA2/PA3");
Serial.println("Hola desde Nucleo U031R8 por pines PA2/PA3 por USB. Testing on Board NUCLEO_U031R8");
digitalWrite(LED_BUILTIN, !digitalRead(LED_BUILTIN));
delay(1000);
}
`