TMS320F28384D: SCI interrupt frame Mismatch gets struck

Hi Sunil,

Thanks for your question!

I have written a FAQ thread for similar issues that may help to narrow down the issue to either hardware/software/config/etc.

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1031947/faq-my-c2000-sci-is-not-transmitting-and-or-receiving-data-correctly-how-do-i-fix-this

If you could walk through this and let me know which of the issues seems most similar, and provide screenshots during the error scenario, this will allow me to provide the quickest support.

I look forward to your response!

Regards,

Vince

Hi Vince,

We figure out issue while power on or some unknown raw data from  HMI send FF or 00 or different size ,, during that time its get struck.

Main Problem is we found through debug.. 

if array  size mismatch.."SCI_readCharArray(uint32_t base, uint16_t * const array, uint16_t length)"

we send from HMI array size of 16 or 86 bytes and slave return 12 bytes..

suppose board  receive 11 or 2 or 1 byte or 12 bytes in network... processor get struck...

this our snipper code..

Recipe==6 ?SCI_readCharArray(SCIA_BASE,( uint16_t *) (Display_RX_Buf),86): SCI_readCharArray(SCIA_BASE,( uint16_t *) (Display_RX_Buf),5); //

we found its struck in below section , kindly guide us how over come from array size mismatch issue,,,

//*****************************************************************************
//
// SCI_readCharArray
//
//*****************************************************************************
void
SCI_readCharArray(uint32_t base, uint16_t * const array, uint16_t length)
{
//
// Check the arguments.
//
ASSERT(SCI_isBaseValid(base));

uint16_t i;
//
// Check if FIFO enhancement is enabled.
//
if(SCI_isFIFOEnabled(base))
{
//
// FIFO is enabled.
// For loop to read (Blocking) 'length' number of characters
//
for(i = 0U; i < length; i++)
{
//
// Wait until a character is available in the receive FIFO.
//
while(SCI_getRxFIFOStatus(base) == SCI_FIFO_RX0)
{
}

//
// Return the character from the receive buffer.
//
array[i] = (uint16_t)
(HWREGH(base + SCI_O_RXBUF) & SCI_RXBUF_SAR_M);
}
}
else
{
//
// FIFO is not enabled.
// For loop to read (Blocking) 'length' number of characters
//
for(i = 0U; i < length; i++)
{
//
// Wait until a character is available in the receive buffer.
//
while(!SCI_isDataAvailableNonFIFO(base))
{
}

//
// Return the character from the receive buffer.
//
array[i] = (uint16_t)
(HWREGH(base + SCI_O_RXBUF) & SCI_RXBUF_SAR_M);
}
}
}

Rgds

Sunil

Please find error in excel sheet..

Docklight serial software to board rs485.xlsx

Rgds

Sunil

Hi vince,

     As I mentioned earlier ,we connect  two slaves with HMI .

    we are using  SCI_readCharArray(SCIA_BASE,( uint16_t *) (Display_RX_Buf),16); driverlib API function  to read caharaters 16bytes from HMI.the problem gets strucks . we also Oberseved that in receive status register RX_WAKE DETECT FLAG =1 at every time we send.

1. we send 8 adress for 2 slaves we the problem didn't struck

2.when we receive a single byte or error byte that  not match 16bytes,the readchar array functions  waits for the buffer to fill.

3.Next to it when we send that the 16 bytes afer a single byte ,that single byte fdidnot overwrites rest of the array is filled with 16byte it getting mismatched.

In this case we observed in Receiver status regsister RX_ERROR,FRAME ERROR,BRK_DT  flag are high.

kindly help me to reslove this issue ,will send scope waveforms in the next reply.

Thanks& Regards,

Ajay S 

Hi Vince,

As you suggest on previous reply, we have change code,, code struck issue we not face till now,, but instead of 16 or 86 byte,, 5 byte or 3  byte or 18byte  array from doclight.. in the case .here i am clear  array Display_RX_Buf[16] if my SPID=!1;


    if (Display_RX_Buf[0] !=spid)
                   {
                     rxsize=0;

                     //  reset_base=1;
                       memset(Display_RX_Buf,0,16);
                       SCI_resetChannels(SCIA_BASE);
                           // If break detected or serialport times out, reset SCI
                           //--- Needed by some serialports when code is run with an emulator
                           //
                           SCI_performSoftwareReset(SCIA_BASE);
                           reset_base=0;
                   }}

Like wise ,   if (Display_RX_Buf[0] !=spid) (reset ) if id not match i reset everything , like wise 255 025 225 or 005 002 015 000 000 000 000... if send from docklight , need clear sci buffer. in Display_RX_Buf.. first it loading 255 025 225 in first set and then 005 002 015 000 000 000 000..

may be junk will come during poweron HMI..we noticed junk is coming... how to clear all receive buffer SCIA base...

Hi Ajay,

Thanks for the follow up. I agree that it sounds then like that junk data may be coming from the HMI power-on. You can verify this by using an oscilloscope if possible to view the HMI TX/RX during power-up.

To clear the buffer from SCI, it is required to:

1. Read the SCI buffer.

2. (If FIFO is used) Continue reading the buffer till the FIFO is empty to clear out the FIFO.

3. Clear all SCI errors that were flagged

4. (Optional) Could be good to do an SCI SW reset, just to really ensure fresh start again.

Let me know if any questions with the above steps.

Regards,

Vince

Hi Vince,

Again we face new issue, when we communicate with two slave board (TMS320F28384D) with our hmi,
Every one second we requesting status of slave board status..

we have same code with different addressing..

Initially HMI communicate with 2 slave boards. After sometimes only one board is communicate properly, second one is after 3 to 4 interrupt in sci.. later its not accepting interrupt. we noticed in timer counter is working .. problematic slave is not accepting interrupt ..

Suppose Slave 2 board communicate first,, its working good update status to hmi, then if slave one is communicate second.. after  3 to 4 interrupt .. communication stop ..

we am using crystal 20mhz oscillator and Baud rate 115200.. please find init file

void init_int()
{

SCI_performSoftwareReset(SCIA_BASE);

SCI_setConfig(SCIA_BASE, DEVICE_LSPCLK_FREQ, 115200, (SCI_CONFIG_WLEN_8 |
SCI_CONFIG_STOP_TWO |
SCI_CONFIG_PAR_NONE));
SCI_resetChannels(SCIA_BASE);
SCI_clearInterruptStatus(SCIA_BASE, SCI_INT_RXRDY_BRKDT);
SCI_enableModule(SCIA_BASE);
SCI_performSoftwareReset(SCIA_BASE);
SCI_enableInterrupt(SCIA_BASE, SCI_INT_TXRDY | SCI_INT_RXRDY_BRKDT);

Interrupt_enable(INT_SCIA_RX);
Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP9);

EINT;

}

based on other forum we changed 
device.h file -->

#define DEVICE_OSCSRC_FREQ 20000000U

//
// Define to pass to SysCtl_setClock(). Will configure the clock as follows:
// PLLSYSCLK = 20MHz (XTAL_OSC) * 40 (IMULT) / (2 (REFDIV) * 2 (ODIV) * 1(SYSDIV))
//
#define DEVICE_SETCLOCK_CFG (SYSCTL_OSCSRC_XTAL | SYSCTL_IMULT(40) | \
SYSCTL_REFDIV(2) | SYSCTL_ODIV(2) | \
SYSCTL_SYSDIV(1) | SYSCTL_PLL_ENABLE | \
SYSCTL_DCC_BASE_1)

//
// 200MHz SYSCLK frequency based on the above DEVICE_SETCLOCK_CFG. Update the
// code below if a different clock configuration is used!
//
#define DEVICE_SYSCLK_FREQ ((DEVICE_OSCSRC_FREQ * 40) / (2 * 2 * 1))

//
// 50MHz LSPCLK frequency based on the above DEVICE_SYSCLK_FREQ and a default
// low speed peripheral clock divider of 4. Update the code below if a
// different LSPCLK divider is used!
//
#define DEVICE_LSPCLK_FREQ (DEVICE_SYSCLK_FREQ / 1)

//
// Define to pass to SysCtl_setAuxClock(). Will configure the clock as follows:
// AUXPLLCLK = 20MHz (XTAL_OSC) * 50 (IMULT) / (2 (REFDIV) * 4 (ODIV) * 1(AUXPLLDIV) )
//
#define DEVICE_AUXSETCLOCK_CFG (SYSCTL_AUXPLL_OSCSRC_XTAL | SYSCTL_AUXPLL_IMULT(50) | \
SYSCTL_REFDIV(2U) | SYSCTL_ODIV(4U) | \
SYSCTL_AUXPLL_DIV_1 | SYSCTL_AUXPLL_ENABLE | \
SYSCTL_DCC_BASE_0)

//
// 125MHz AUXCLK frequency based on the above DEVICE_AUXSETCLOCK_CFG. Update
// the code below if a different clock configuration is used!
//
#define DEVICE_AUXCLK_FREQ ((DEVICE_OSCSRC_FREQ * 50) / (2 * 4 * 1))

based on other forum we changed 
device.c file -->

SysCtl_setLowSpeedClock(SYSCTL_LSPCLK_PRESCALE_1);

Kindly guide me if any configuration is wrong and solution for  above problem mentioned...

Thanks in advance for guidance..

Rgds

Ajay S

Hi Ajay,

Could you provide a scope capture of the data received by C2000 when the device is not interrupting? Basically, a scope capture of the RX line when the problem is occurring. This will allow the debug to move much faster (as we'll be able to determine what is wrong with the configuration). The configuration you provided could work perfectly, but only for certain types of data packets received.

Regards,

Vince

Hi, Vince,

now its working, Problem sort out by adding below code while its enter SCI interrupt and we clear all buffer variable,,  previous we did software reset when number bytes enter and store in array , if not match we clear software  reset.  but now once SCI interrupt  call , we check  the error immediately clearing everything please find below ..

uint16_t scistatusbit = SCI_getRxStatus(SCIA_BASE);
if ((scistatusbit & SCI_RXSTATUS_ERROR)!=0)
{
scicount=0;
SCI_performSoftwareReset(SCIA_BASE);
memset(Display_RX_Buf_temp,0,105);
memset(Display_RX_Buf,0,105);
read_flag=0;
reset_base=0;
rxsize=0;
}

we have tested 5 hours now communication between  HMI and Board working and status update successful

But please confirm that, In initialization we implemented "SCI_enableInterrupt(SCIA_BASE, SCI_INT_RXRDY_BRKDT);"" 

but in sci isr we clear  SCI_clearInterruptStatus(SCIA_BASE, SCI_INT_RXFF); 

 kindly confirm its correct that  clear  #define SCI_INT_RXFF           0x10U  //!< RX FIFO level interrupt

__interrupt void sciaRXFIFOISR(void)
{
iamhere123=22;
postTransmission1();
recive_data();
if((Display_RX_Buf[0]==Spid[1] && Spid[1]!=0)||(Display_RX_Buf[0]==Spid[2] && Spid[2]!=0)||(Display_RX_Buf[0]==Spid[3] && Spid[3]!=0)||(Display_RX_Buf[0]==Spid[4] && Spid[4]!=0))
{
Check_Setting();
}
SCI_clearOverflowStatus(SCIA_BASE);
SCI_clearInterruptStatus(SCIA_BASE, SCI_INT_RXFF);
Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP9);
}

Rgds

Ajay S

Hi Vince,

Yes,,  in initialization we dint enable SCI_enableInterrupt(SCIA_BASE, SCI_INT_RXFF); but while clearing  SCI_clearInterruptStatus(SCIA_BASE, SCI_INT_RXFF) ..

whether its right??

In our code in initialization we enable SCI_enableInterrupt(SCIA_BASE, SCI_INT_RXRDY_BRKDT);

 but while clearing  SCI_clearInterruptStatus(SCIA_BASE, SCI_INT_RXRDY_BRKDT)  SCI communication  not working later..

1..kindly confirm whether we should clear SCI_INT_RXRDY_BRKDT or Only interrupt  enable is enough?? and 

2..  For SCI_readCharBlockingNonFIFO(SCIA_BASE); we have to enable SCI_enableInterrupt(SCIA_BASE, SCI_INT_RXFF ); or not ??

Please find SCI communication initialization and ISR :- 

void initSCIAFIFO()
{
SCI_performSoftwareReset(SCIA_BASE);
Interrupt_register(INT_SCIA_RX, sciaRXFIFOISR);
// Baud rate 115200 8 Bit data 1 Bit stop No parity bit
SCI_setConfig(SCIA_BASE, DEVICE_LSPCLK_FREQ, 115200, (SCI_CONFIG_WLEN_8 |
SCI_CONFIG_STOP_TWO |
SCI_CONFIG_PAR_NONE));
SCI_resetChannels(SCIA_BASE);
SCI_clearInterruptStatus(SCIA_BASE, SCI_INT_RXRDY_BRKDT);
SCI_enableModule(SCIA_BASE);
SCI_performSoftwareReset(SCIA_BASE);
SCI_enableInterrupt(SCIA_BASE, SCI_INT_RXRDY_BRKDT);

/*#ifdef AUTOBAUD
//
// Perform an autobaud lock.
// SCI expects an 'a' or 'A' to lock the baud rate.
//
SCI_lockAutobaud(SCIA_BASE);
#endif*/
Interrupt_enable(INT_SCIA_RX);
Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP9);
EINT;
}

Interrupt isr:- 

__interrupt void sciaRXFIFOISR(void)
{
iamhere123=22;
postTransmission1();
recive_data();
if((Display_RX_Buf[0]==Spid[1] && Spid[1]!=0)||(Display_RX_Buf[0]==Spid[2] && Spid[2]!=0)||(Display_RX_Buf[0]==Spid[3] && Spid[3]!=0)||(Display_RX_Buf[0]==Spid[4] && Spid[4]!=0))
{
Check_Setting();
}
SCI_clearOverflowStatus(SCIA_BASE);
SCI_clearInterruptStatus(SCIA_BASE, SCI_INT_RXFF);
Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP9);
}