Strange logic problem after compilation in CUBE IDE 1.14.1

[kevinKang]

Hi all,

    basic info:

    stm32 CUBE IDE v1.14.1

    PC: Win10 64bit

    MCU:STM32G0B1CC

 

    In my code, there are two functions to control the battery to enter charge mode from init mode, when the battery receive a command. Check_AuthCmdToCHG（）will set CANOpenStruct.flag_authCmdGotoCHG to STD_TRUE and set CANOpenStruct.sendTPDOInfo STD_TRUE. 

   normally，after CANOpenStruct.flag_authCmdGotoCHG be set to  STD_TRUE , CheckFlag_InitGotoCHG() will make state machine FSM goes to charge mode.

   But it's very strange, i send a command to MCU, then I receive TPDO info from CAN bus, this means CANOpenStruct.sendTPDOInfo already be set to STD_TRUE. however  CANOpenStruct.flag_authCmdGotoCHG and CheckFlag_InitGotoCHG() are not work!

   When I examined the code, I couldn't find the cause. Therefore, I wrote a test function Test_CANCmd() ready to read CANOpenStruct.flag_authCmdGotoCHG and CANOpenStruct.sendTPDOInfo out, the other did not modify any code!  I compile the code and burn it like before. Then something amazing happened. Everything worked!

   is there anyone can explain this? The Test_CANCmd（）function just uses the value of CANOpenStruct.flag_authCmdGotoCHG, FSMStruct.flag_initGotoCHG and does not change it, why does it have such an effect? 

   

void Check_AuthCmdToCHG(void)
{
 if(sysInfoStruct.statusCharger == STD_FALSE)
 {
 if(pinStatus_present == STD_ON)
 {
 if(sysInfoStruct.chargerOnline == 0x1234)
 {
 sysInfoStruct.statusCharger = STD_TRUE;
 CANOpenStruct.flag_authCmdGotoCHG = STD_TRUE;
 CANOpenStruct.sendTPDOInfo= STD_TRUE; //if true,it will enable CAN TPDO
 }
 }
 else
 {
 sysInfoStruct.chargerOnline = 0;
 }
 }
}

void CheckFlag_InitGotoCHG(void)
{
 if(pinStatus_present == STD_ON)
 {
 if(CANOpenStruct.flag_authCmdGotoCHG == STD_TRUE)
 {
 CANOpenStruct.flag_authCmdGotoCHG = STD_FALSE;
 FSMStruct.flag_initGotoCHG = STD_TRUE;
 }
 }
}

uint32 Test_CANCmd(union_64bits cmd)
{
 //..........
 switch(cmd.byte[2])
 {
 case 0xF1:
 //......
 break;
 case 0xF5: //ESD Pres pin onoff times test
 if(cmd.byte[3] == 0xFF)
 {
 errCode = CANOpenStruct.flag_authCmdGotoCHG;
 }
 else if(cmd.byte[3] == 0xFE)
 {
 errCode = FSMStruct.flag_initGotoCHG;
 }
 else
 {
 errCode = TEC_cmdParaErr;
 }
 break;
 //..........
 }
 return errCode;
}

 

[liaifat85]

If you have debugging enabled, print the values of flag_authCmdGotoCHG, sendTPDOInfo, and FSMStruct.flag_initGotoCHG right after setting and reading them to observe any anomalies.

[kevinKang]

Hi liaifat85,

  Thanks for your feedback!

  My current APP code is address offset because the system comes with a bootloader. I have tried to modify the offset address and directly run online simulation, and the program works normally.

  I have tried the following 2 situations:

  S1:  

  Comment out the code for CANOpenStruct.flag_authCmdGotoCHG and FSMStruct.flag_initGotoCHG , without changing anything else, and the program works abnormally.

uint32 Test_CANCmd(union_64bits cmd)
{
 //..........
 switch(cmd.byte[2])
 {
 case 0xF1:
 //......
 break;
 case 0xF5: //ESD Pres pin onoff times test
 /*
 if(cmd.byte[3] == 0xFF)
 {
 errCode = CANOpenStruct.flag_authCmdGotoCHG;
 }
 else if(cmd.byte[3] == 0xFE)
 {
 errCode = FSMStruct.flag_initGotoCHG;
 }
 else
 {
 errCode = TEC_cmdParaErr;
 }
 */
 break;
 //..........
 }
 return errCode;
}

 S2:

  Keep CANOpenStruct.flag_authCmdGotoCHG and FSMStruct.flag_initGotoCHG code, do not change other codes, the program works fine.

[kevinKang]

My problem has been solved!
Root cause: STM32G0B1CC is based on Arm Cortex -M0+ core, it no support unaligned accesses, pay attention to the large structure in your code.