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TMS320F28075: SCI RXERROR

Emma Wang
Expert 4910 points
Part Number: TMS320F28075

Hi expert,

We encounter a problem in F28075 SCI debugging:
1) The SCI-RX pin always has data (the host computer sends a frame of data every 100ms, each frame of data is 15 bytes), but the register SCIFFRX.bit.RXFFST is 0 for about 30s;
2) During the 30s, both SCIRXST.RXERROR and SCIRXST.FE were set to 1, and the software did not reset the serial port (SW RESET was not set to 1), but later read the values ​​of SCIRXST.RXERROR and SCIRXST.FE. are both 0;
3) After the phenomenon that the SCI cannot receive data lasts for about 30s, the data received by the SCI returns to normal.

There are two questions, please help to answer, thank you!
Q1: After SCIRXST.RXERROR is set to 1, SCI RX BUFF cannot receive data? After SCIRXST.RXERROR is set to 1, what is the receive/transmit processing logic of SCI? No relevant instructions were found in "TMS320F2807x Microcontrollers Technical Reference Manual";
Q2: After SCIRXST.RXERROR is set to 1, software reset is not performed. Why are SCIRXST.RXERROR and SCIRXST.FE cleared?

SCI configuration code is below:

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ScicRegs.SCICCR.all =0x0007;
ScicRegs.SCICTL1.all =0x0003;
ScicRegs.SCICTL2.bit.RXBKINTENA =0;
//Baud rate is 38400 bit/s = 20000000/((64+1)*8) //LSPCLK = 20MHz
ScicRegs.SCIHBAUD.all = 0;//ARM_BAUD>>8;
ScicRegs.SCILBAUD.all = 64;//ARM_BAUD&0x00ff;
ScicRegs.SCICTL1.all =0x0023;
ScicRegs.SCIFFTX.all=0xC000;
ScicRegs.SCIFFRX.all=0x10;
ScicRegs.SCIFFCT.all=0;
ScicRegs.SCIFFTX.bit.TXFIFORESET=1;
ScicRegs.SCIFFRX.bit.RXFIFORESET=1;
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

BR

Emma

  • 0
    TI__Mastermind 23410 points

    Hi Emma,

    Emma Wang said:
    3) After the phenomenon that the SCI cannot receive data lasts for about 30s, the data received by the SCI returns to normal.

    To clarify, no data is being received for those 30 seconds correct? When it returns to normal, new data is being received. 

    Emma Wang said:
    Q1: After SCIRXST.RXERROR is set to 1, SCI RX BUFF cannot receive data? After SCIRXST.RXERROR is set to 1, what is the receive/transmit processing logic of SCI? No relevant instructions were found in "TMS320F2807x Microcontrollers Technical Reference Manual";

    I will check with design what the current status of the SCI module is while there are errors. Typically it is expected that the customer implement a SW reset upon an error so that errors are cleared. 

    Emma Wang said:
    Q2: After SCIRXST.RXERROR is set to 1, software reset is not performed. Why are SCIRXST.RXERROR and SCIRXST.FE cleared?

    The only way RXERROR can be cleared is through a SW RESET or by a system reset. Is the system resetting at any point? Also, RXERROR is a logical OR of the break detect, framing error, overrun, and parity error. What are the actual errors being seen?

    Best Regards,

    Marlyn

  • 0 in reply to Marlyn Rosales Castaneda20
    TI__Mastermind 23410 points

    Hi Emma,

    I am still waiting to hear back from our design team. I will send them another note and let you know what they say as soon as I hear back a response. 

    Best Regards,

    Marlyn

  • 0 in reply to Marlyn Rosales Castaneda20
    TI__Mastermind 23410 points

    Hi Emma,

    Marlyn Rosales Castaneda20 said:
    I will check with design what the current status of the SCI module is while there are errors.

    I heard back from the design team and confirmed that the SCI module can receive data even with the error interrupt unserviced.

    Best Regards,

    Marlyn