SCI Transmitter send one of 2 times, and cause RESET

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SCI Transmitter send one of 2 times, and cause RESET

336 Views
corso66
Contributor I

Hi,

In my S08PA60 design, i noticed SCI transmitter bug.

Every second, i send to the server 49 bytes, from Tx SCI1 module and TIE interrupt enabled.

First time it sends normally, but second nothing, and again. So, server receive every 2 seconds. And randomly, MCU reset.

In debug mode, step by step, all look correct, but none byte is sent.

Alternatively, if i put 1ms loop tempo just after initiate first byte, all is running perfectly. But i don't understand what happens, because there is reset some time.

Below, my init SCI, portion of main program and ISR:

Init SCI1 when MCU is starting :

 

 

/* Setup PTC6/PTC7 named "TxD"/"RxD" Serial module (SCI1) */
						
SCI1_BD = 22;	//Select Baud rate : SBR * 16 = 347 => SBR = 22 => 57600bd
SCI1_C1 = 0b00000100;		
SCI1_C2_RIE = 1;
SCI1_C2_RE = 1;
SCI1_C3 = 0b00001000;		//overrun enabled

 

 

 

Start Tx with interrupt function :

 

 

void SCI_TE_ON(void)
{
	U8 u8status;
	
	u8status = SCI1_S1; 		// clear the interrupt event flag
	SCI1_C2_TIE = 1;                // Transmit interrupt enebled
	SCI1_C2_TE = 1;                 // Transmitter ON
	u8status = SCI1_S1; 		// clear the interrupt event flag
}

 

 

 

Interrupt subroutine :

 

 

interrupt VectorNumber_Vsci1tx void SCI1_Tx (void)
{
U8 u8status;
U8 *p = (U8*)&packet;
U8 *uuid = (U8*)0x30f8;		// Address of UUID

u8status = SCI1_S1; 		// clear the interrupt event flag

        if(data_type == STANDARD && SCI_byte_ctn_Tx < SCI_nb_byte_Tx) 	 
        {
	        if(buffer_type == SCI_BUFFER)
	        {
		        SCI1_D = SCI_buffer_Tx[SCI_byte_ctn_Tx]; //Push byte
		        SCI_byte_ctn_Tx++;	// and pointer for next data
	        }
                else{...}
        }
        else
        {
	        SCI_nb_byte_Tx = 0;
	        SCI_byte_ctn_Tx = 0;
	        SCI_ctn_byte_packet_TxRx = 0;
	        SCI_Tx_free = YES;
	        SCI_TE_OFF();
	        SCI_RE_ON();
        }
}

 

 

 

And portion of main program :

 

 

//Send data on eth every XX seconds (for automatic raw data to send)
if(u8inc_Send_On_Eth == 1)
{
	if(u8Send_On_Eth > 0 && srv_request == NO && SCI_Tx_free == YES)
	{				

		if(PPump_state == ON && Ts >= u8TsMin)	//Heating sequence is starting ?
		{
			rt_rawdata(); // Fill Tx Buffer							
			SCI_TE_ON();  // Start sending first buffer byte
			dly1msU16(1); // WITHOUT THIS TEMPO, THERE IS PROBLEM
		}
			}
			
	u8inc_Send_On_Eth = 0;
}

 

 

 

There is someting wrong with interrupt, can anyone can help me ?

Thank you

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298 Views
Julián_AragónM
NXP TechSupport
NXP TechSupport

Hi @corso66,

It seems to be a problem with the receive overrun condition, please check out this community post:

Here is also a community post with a CodeWarrior v10.3 sample code that set the SCI2 at 9600:

You can find more information about this example and peripheral inside the S08 User Guide (HCS08QRUG) in the "Using the Serial Communications Interface (SCI) for the HCS08 Family Microcontrollers" section.

I hope you find this helpful, and update me on any findings.

Best regards,
Julián.

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