Program gets stuck, when set SCLK with PD1 on STM32G071

[Eddddddddy]

Describe the bug
The problem is simple, I use STM32G071GBU6, using SPI to connect the sensor.
The IO configuration of SPI is as follows:

  SPI.setMISO(PA3);
  SPI.setMOSI(PA4);
  SPI.setSCLK(PD1);
  SPI.setSSEL(PD0);

This configuration is supported in STM32CUBEMX. And this IO configuration is also supported in the PeripheralPins.c file.
The problem I'm having is that as long as SCLK is configured as PD1, the program gets stuck when it executes to read the SPI. If I replace PD1 with other pins, it will not get stuck, and I can read and write SPI data normally.

To Reproduce
Using SPI example (DigitalPotControl.ino)

// inslude the SPI library:
#include <SPI.h>


// set pin 10 as the slave select for the digital pot:
const int slaveSelectPin = 10;

void setup() {
  // set the slaveSelectPin as an output:
  Serial.begin(9600);
  pinMode(slaveSelectPin, OUTPUT);
  // initialize SPI:
  SPI.setMISO(PA3);
  SPI.setMOSI(PA4);
  //  SPI.setSCLK(PB8);
  SPI.setSCLK(PD1);
  SPI.setSSEL(PD0);
  SPI.begin();
}

void loop() {
  Serial.println("running");
  digitalPotWrite(0, 1);
}

void digitalPotWrite(int address, int value) {
  // take the SS pin low to select the chip:
  digitalWrite(slaveSelectPin, LOW);
  //  send in the address and value via SPI:
  SPI.transfer(address);
  SPI.transfer(value);
  // take the SS pin high to de-select the chip:
  digitalWrite(slaveSelectPin, HIGH);
}

Expected behavior
Serial will print 'running' without stopping with PD1.

Desktop (please complete the following information):

• OS: macOS 13.1
• Arduino IDE version: 1.8.19
• STM32 core version: 2.3.0
• Tools menu settings if not the default:

• Upload method: SWD

Board (please complete the following information):

• Name: Custom G071

[fpistm]

Hi @Eddddddddy
Could you enable the Core logs in this menu:

and see if you get any message.

[Eddddddddy]

Hi,
I enabled the Core logs, and no further information is output from the Serial port. And I tried Core Logs and Symbols Enabled (-g), the same result.

I'm not sure Core logs is output like this way.

[fpistm]

By default, Core logs output on the same UART than Serial instance. It can also be defined to dedicated uart.

[fpistm]

Anyway, it is possible there is no output. As you used custom board hard to tell what is the issue and config.

[Eddddddddy]

thank you for your reply.
Although there is no official G071GBU6N board. I may need to buy a NUCLEO-G071RB to try and find the problem with the hardware.
But I think the problem might be with the software. No seriousness, just intuition. I'll probably keep digging for software issues while I wait for the NUCLEO to ship.

[Eddddddddy]

By the way, if you need .ioc files to indicate IO configuration, I'd be happy to provide them. or any other files or information. like board schematic.

[fpistm]

Schematics of the board could help.

Looking at your sketch there is an issue.
You defined the Hardware SPI SSEL and drive manually the CS pin I guess it conflicts.
Try to comment the setSSEL

// inslude the SPI library:
#include <SPI.h>

// set pin 10 as the slave select for the digital pot:
const int slaveSelectPin = 10;

void setup() {
  // set the slaveSelectPin as an output:
  Serial.begin(9600);
  pinMode(slaveSelectPin, OUTPUT);
  // initialize SPI:
  SPI.setMISO(PA3);
  SPI.setMOSI(PA4);
  SPI.setSCLK(PD1);
-   SPI.setSSEL(PD0);
+  // SPI.setSSEL(PD0);
  SPI.begin();
}

void loop() {
  Serial.println("running");
  digitalPotWrite(0, 1);
}

void digitalPotWrite(int address, int value) {
  // take the SS pin low to select the chip:
  digitalWrite(slaveSelectPin, LOW);
  //  send in the address and value via SPI:
  SPI.transfer(address);
  SPI.transfer(value);
  // take the SS pin high to de-select the chip:
  digitalWrite(slaveSelectPin, HIGH);
}

[fpistm]

Hi @Eddddddddy
I've got a Nucleo G071RB and tested your code and it works as expected (without setting PD0 as SSEL):

Note that I've disabled the Serial to be able to use PA3 as by default it is used for it anyway I've tested with Serial using PC2 instead of PA3.

// inslude the SPI library:
#include <SPI.h>

// set pin 10 as the slave select for the digital pot:
const int slaveSelectPin = 10;

void setup() {
//  Serial.begin(9600);
  // set the slaveSelectPin as an output:
  pinMode(slaveSelectPin, OUTPUT);
  // initialize SPI:
  SPI.setMISO(PA3);
  SPI.setMOSI(PA4);
  SPI.setSCLK(PD1);
  // SPI.setSSEL(PD0);
  SPI.begin();
}

void loop() {
//  Serial.println("running");
  digitalPotWrite(0, 1);
}

void digitalPotWrite(int address, int value) {
  // take the SS pin low to select the chip:
  digitalWrite(slaveSelectPin, LOW);
  //  send in the address and value via SPI:
  SPI.transfer(address);
  SPI.transfer(value);
  // take the SS pin high to de-select the chip:
  digitalWrite(slaveSelectPin, HIGH);
}

You should:

• check if your hardware connection is correct.
• is it really a STM32G071GBU6N and not STM32G071GBU6? because the STM32G071GBU6 has no SPI2 CLK on PD1.
  and based on your first comment it is not clear as you stated STM32G071GBU6 and you selected STM32G071GBUxN in Arduino menu. It could explain you "get stuck" in that case.
• do not set PD0 as SSEL as you manually drive it.

About core log, I've checked and if the SPI pins defined is not coherent then I got a message and the application stop as expected.