We created our own PCB with a STM32L082KZ MCU. And added this as a board to platformIO with arduino framework by using STM32L073(Nucleo) files as a template.
Now we have a wierd issue with SoftwareSerial. On a PC with ststm32 platform 6.0.0 SoftwareSerial works but on a pc with the latest version 6.1.0 it doesn’t.
I have made the variant files for both versions because they slightly changed in the 6.1.0 version.
I updated the ststm32 platform to 6.1.0 on the pc where it worked (6.0.0 version) this also broke it on this PC. So I did a roll back with an backup I had and than it worked again.
I tried to use the SoftwareSerial.h and .cpp file of 6.0.0 in the 6.1.0 version but that didn’t solve it either.
I also tested HardwareSerial on the same pin’s but that seems to work on both version.
Does anybody have a solution or an idea where the problem may lay?
I do not recieve any data from a GNSS module that is connected to my MCU when using SoftwareSerial.
This only happens in the 6.1.0 version of ststm32 platform.
On a pc with 6.0.0 version of ststm32 platform I do get data.
If you use a custom board definition (and Arduino variant?) there might by problems in there, too. Do you have the complete project so that it’s reproducible?
I made all these files locally and copy paste them in the folders:
This are the files in the JENG_STM32L082KZ folder:
Do you mean that I share these files somewhere so you can reproduce the error?
#include <Arduino.h>
#include <SoftwareSerial.h>
void initGPIO();
// Testing GNSS, GNSSerial(RX,TX)
SoftwareSerial GNSSSerial(PB7, PB6);
int incomingByte = 0;
// end GNSS
void setup()
{
// initialize pin.
initGPIO();
//Testing GNSS
Serial.begin(9600);
GNSSSerial.begin(9600);
//End GNSS setup
Serial.println("Finished Setup");
}
void loop()
{
Serial.println("Start Loop");
// put your main code here, to run repeatedly:
if(GNSSSerial.available() > 0){
incomingByte = GNSSSerial.read();
// say what you got:
Serial.print("I received: ");
Serial.println(incomingByte, DEC);
}
delay(100);
}
void initGPIO()
{
// LED PIN
pinMode(PA12, OUTPUT); //Red Status led
//----------------------------------------------------
// Pins that are not used for now should be set as OUTPUT.
//----------------------------------------------------
//Pins connected with NB-IoT
pinMode(PA2, OUTPUT); //TX LPUART1 To NB-IoT
pinMode(PA3, OUTPUT); //RX LPUART1 To NB-IoT
pinMode(PA4, OUTPUT); //Interrupt pin From NB-IoT
pinMode(PA5, OUTPUT); //Input STATUS pin From NB-IoT
pinMode(PA7, OUTPUT); //Connected to PWTKEY pin From NB-IoT. puls High puts NB-IoT on.
pinMode(PB0, OUTPUT); //Connected to RTC_EINT pin From NB-IoT. puls High wakes NB-IoT from sleep.
//Pins connected with GNSS
pinMode(PB3, OUTPUT); //Connected to V_BCKP switch of the GNSS. High is off, LOW is on.
digitalWrite(PB3, LOW); //HIGH is OFF, LOW is ON
pinMode(PB5, OUTPUT); //Connected to V_on switch of the GNSS. High is off, LOW is on.
digitalWrite(PB5, LOW); //HIGH is OFF, LOW is ON
//pinMode(PB6, OUTPUT); //TX USUART1 To GNSS
//pinMode(PB7, OUTPUT); //RX USUART1 To GNSS
pinMode(PA15, INPUT); //Interrupt pin From GNSS. (3D_FIX)
//Pins connected with Motion Sensor
pinMode(PA11, OUTPUT); //Interrupt pin From Motion Sense. (IN_OUT)
pinMode(PA9, OUTPUT); //SCL I2C1 To Motion Sensor
pinMode(PA10, OUTPUT); //SDA I2C1 To Motion Sensor
// NOT CONNECTED PINS
pinMode(PA0, OUTPUT); //USART4_TX
pinMode(PA1, OUTPUT); //USART4_RX
pinMode(PA6, OUTPUT);
pinMode(PB1, OUTPUT);
pinMode(PA8, OUTPUT);
pinMode(PB4, OUTPUT);
}
On my PCB is also a module connected with I2C. I tried to scan for the adres with the code below. But the there was no I2C device found.
When I scan in STM32Cube IDE for I2C devices I find the module on adress 0x19.
#include <Arduino.h>
#include <Wire.h>
void setup()
{
Wire.begin();
Serial.begin(9600);
while (!Serial); // Leonardo: wait for serial monitor
Serial.println("\nI2C Scanner");
}
void loop()
{
byte error, address;
int nDevices;
Serial.println("Scanning...");
nDevices = 0;
for(address = 1; address < 127; address++ )
{
// The i2c_scanner uses the return value of
// the Write.endTransmisstion to see if
// a device did acknowledge to the address.
Wire.beginTransmission(address);
error = Wire.endTransmission();
if (error == 0)
{
Serial.print("I2C device found at address 0x");
if (address<16)
Serial.print("0");
Serial.print(address,HEX);
Serial.println(" !");
nDevices++;
}
else if (error==4)
{
Serial.print("Unknow error at address 0x");
if (address<16)
Serial.print("0");
Serial.println(address,HEX);
}
}
if (nDevices == 0)
Serial.println("No I2C devices found\n");
else
Serial.println("done\n");
Serial.println("Waiting 5 second and start the next scan.");
delay(5000); // wait 5 seconds for next scan
}
Result:
Maybe this is connected to why SoftwareSerial does not work for me. Maybe I missed some files that I have to change or some settings.
