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code crashes when I include I2C1_IRQ_handler

Gopal Gowda

Hi guys,

I using 

keil uvisionV5.35.0.0

arm_compiler : V6.16

We are developing a project on STM32L071CZYx MCU. which has 

flash memory: 192kB

RAM: 20KB

The code perfectly works when it is in separate project but we need to combine both the project.

In 1st project We have configured I2C1 has a slave. i have attached code for the irq_handler 

void I2C1_IRQHandler(void)
{
		I2C1->CR1 &= ~(I2C_CR1_RXIE |I2C_CR1_ADDRIE | I2C_CR1_STOPIE | I2C_CR1_TXIE);
		switch((I2C1->ISR &(I2C_ISR_STOPF | I2C_ISR_ADDR |I2C_ISR_RXNE | I2C_ISR_TXIS)))
		{
			case 0x08: //address match
				dev_addr = ((I2C1->ISR >> 16 ) & 0xFE); // assigning Recieved slave address
				if(I2C1->ISR & I2C_ISR_DIR)
					{
						// Slave address with Read bit
						if(i2c_state == I2C_GOT_CONTROL_WORD_ADDR)
						{
							i2c_state = I2C_REPEATED_START;
						}
						else 
						{
							i2c_state = I2C_RD_STARTED;
						}
						__HAL_I2C_CLEAR_FLAG(&hi2c1,(I2C_FLAG_ADDR ));
						I2C1->CR1 |= (I2C_CR1_TXIE); // enabling Transmitter Interrupt
						//slave Tx
					}
				else
					{
						// Slave address with write bit
						i2c_pkt_length = 0;
						
						i2c_state = I2C_WR_STARTED;
						__HAL_I2C_CLEAR_FLAG(&hi2c1,I2C_FLAG_ADDR);
						I2C1->CR1 |= (I2C_CR1_RXIE); // stopIE is not required
						//slave Rx
						} 
			break;
			case 0x04: //rx data for master
				if(i2c_state == I2C_WR_STARTED)
				{
					CW =I2C1->RXDR;
					word_addr = CW;
					i2c_state = I2C_GOT_CONTROL_WORD_ADDR;
				}
				else
				{
					i2cdatarx[i2c_pkt_length++] = I2C1->RXDR;
					i2c_state = I2C_DATA_STARTED;
				}
				__HAL_I2C_CLEAR_FLAG(&hi2c1,I2C_FLAG_RXNE);
			I2C1->CR1 |= (I2C_CR1_RXIE | I2C_CR1_ADDRIE | I2C_CR1_STOPIE); // enabling Rx address match and Stop interrupt
			break;
			
			case 0x20: // detected a stop
				if (dev_addr == 0xB0 )
				{
					if (i2c_state == I2C_DATA_STARTED || i2c_state == I2C_GOT_CONTROL_WORD_ADDR)
					{
						F0_write(word_addr);
					}
					else 
					{
					I2C1->ISR |= I2C_ISR_TXE;//Setting  flushing the TX buffer for new data transfer
					}
				}
				else
				{
					if (i2c_state == I2C_DATA_STARTED || i2c_state == I2C_WR_STARTED)
					{
						if (mode == mFACTORY)
						{
							A0_write_FM(word_addr); // writting to sram and Eeprom
						}
						else
						{
							A0_write(word_addr);
						}
					}
					else 
					{
					I2C1->ISR |= I2C_ISR_TXE;//Setting  flushing the TX buffer for new data transfer
					}
				}
				i2c_state = I2C_IDLE;
				__HAL_I2C_CLEAR_FLAG(&hi2c1,I2C_FLAG_STOPF);
				I2C1->CR1 |= (I2C_CR1_ADDRIE); // enabling address match 
			break;
			case 0x02: // Transmit has detected
					
					//i2cdatarx = I2C_read_F0(CW);
					if (dev_addr == 0xB0)
					{
						I2C1->TXDR = F0_Read(CW);
					}
					else
					{
						if (mode == 1)
							{
						I2C1->TXDR = A0_read_FM(CW);
							}
						else
							{
							I2C1->TXDR = A0_read(CW);	
							}
					}
				__HAL_I2C_CLEAR_FLAG(&hi2c1,(I2C_FLAG_ADDR));
				I2C1->CR1 |= (I2C_CR1_STOPIE | I2C_CR1_TXIE);
			break;
		}
}

and 1st project alone uses :

==============================================================================

Total RO Size (Code + RO Data) 9188 ( 8.97kB)
Total RW Size (RW Data + ZI Data) 3704 ( 3.62kB)
Total ROM Size (Code + RO Data + RW Data) 9228 ( 9.01kB)

==============================================================================

And the 2nd project alone uses:

stack memory : 10.5kB

==============================================================================

Total RO Size (Code + RO Data) 146028 ( 142.61kB)
Total RW Size (RW Data + ZI Data) 19440 ( 18.98kB)
Total ROM Size (Code + RO Data + RW Data) 146188 ( 142.76kB)

==============================================================================

and the combined code uses :

we have removed the 1280 bytes of global variable(array) and we got,

and even increase the stack memory to : 12kB

==============================================================================

Total RO Size (Code + RO Data) 146028 ( 142.61kB)
Total RW Size (RW Data + ZI Data) 19440 ( 18.98kB)
Total ROM Size (Code + RO Data + RW Data) 146188 ( 142.76kB)

==============================================================================

In the combined project code crashes when we include 1st projects I2C_IRQ_handler but without it works fine with polling method but we can't include all the required features in it. I have many method like increasing stack size and reducing global variable but nothing worked. I will be thankful if I get an information. and even attached an error pic.

Parents
  • 0

    Hi Gopal,

    you should trace back the instruction that caused HardfFault.

    You can either look into function hsc_dev_obj_init by looking into call stack, or you can inspect memory at 0x200045C0 and see what was the "return address" value when the HardFault happened.

    The content of the memory where SP points to should containing the following information in that particular order:

    R0
    R1
    R2
    R3
    R12
    LR
    return address
    xPSR

    the return address is either the address of the instruction that caused HardFault or the instruction after it depending on the type of the exception.

    Anyways, for more information you should search online for debugging of HardFault as there is a lot resources you can find on the matter online.

    Best regards, Milorad

Reply
  • 0

    Hi Gopal,

    you should trace back the instruction that caused HardfFault.

    You can either look into function hsc_dev_obj_init by looking into call stack, or you can inspect memory at 0x200045C0 and see what was the "return address" value when the HardFault happened.

    The content of the memory where SP points to should containing the following information in that particular order:

    R0
    R1
    R2
    R3
    R12
    LR
    return address
    xPSR

    the return address is either the address of the instruction that caused HardFault or the instruction after it depending on the type of the exception.

    Anyways, for more information you should search online for debugging of HardFault as there is a lot resources you can find on the matter online.

    Best regards, Milorad

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