SoftwareSerial hardware timer interrupt not being called?

[lab-mathias-claussen]

[Edit]: Problem fixed with current code from Git ( commit 1043594 )

STM32F072C8T6 / Elektor LoRa Node

Seems like #879 the interrupt for the hardware timer is not getting called. We can see that the IO Pins get configured ( PA2 and PA3 ) in this case.

To Reproduce:

Fit a STM32F072C8T6 on a bluepill and put the following code using version 1.8 of the core on the board:

/* Includes */
#include <hal/hal.h>
#include <SPI.h>
#include <Wire.h>

#include <SoftwareSerial.h>
#include <EEPROM.h>

SoftwareSerial SerialX(PA3, PA2); //RX, TX
/**************************************************************************************************

• Function : print_array
• Description : will print an array of data as hex
• Input : uint8_t * data , uint32_t len
• Output : none
• Remarks : none
  **************************************************************************************************/
  void print_array(uint8_t * data , uint32_t len ){

for(uint32_t i=0;i<len;i++){
Serial.print("0x");
Serial.print(*data++);
Serial.print(" ");
}
Serial.println("");
}

void setup() {
Serial.begin(115200);
SerialX.begin(9600);
Serial.println("Boot");

}

void loop() {
SerialX.write(0xAA);
while(SerialX.available() ){
Serial.write(SerialX.read());
}
Serial.write(0x55);

}

What will be shown on USART 1 is:

Boot
U

And at that Point the code seems to stop at all

PA2 is TX and PA3 is RX for hardware serial output we use PA9 / PA10

Currently we try to investigate this further but stummbeled also accross some other issues that may lay down int the variant itself. The code works fine on a STM32F103 blue pill

[stas2z]

#895

[fpistm]

Hi @lab-mathias-claussen

You can check the issue provided by @stas2z

Anyway about this:

Fit a STM32F072C8T6 on a bluepill

What would you mean by this ? You replaced the STM32F103 by a STM32F072C8T6 ?
So this is a custom board?
Which variant you used in this case?

[lab-mathias-claussen]

It uses the ELEKTOR_F072C8 variant, an we replaced the STM32F103 by a STM32F072C8T6. This is kind of a custom board for internal development to mimic the ELEKTOR_F072C8 variant.

[lab-mathias-claussen]

Fixed with current code from Git repository
Thanks