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low cost rs232 boot

shashank jain53233
Prodigy 30 points

Other Parts Discussed in Thread: TMS320F2808, SN75LV4737A, MAX3221

hi,

I want to communicate with tms320f2808 through serial port rs232 , the data sheet given on this site has no clue about which pins to connect the chip for serial port communication. can you give me detailed pin configuration for f2808 so that i can run a digital filter program on the chip using serial port . i have downloaded the required algorithms and soft wares for the same purpose from spectrum digital..

I would be really grateful if a ti employee could help me on this 

 

  • 0
    TI__Guru 64620 points

    In Section 3.2.21 of the TMS320F2808 datasheet, the SCI peripheral supports UART functionality.  On the TMS320F2808, there are 2 SCI peripherals.  They can be brought out to a number of pins depending on the multiplexing mode of that pin.  For SCI port A, you will find the following pins:

    GPIO28/SCIRXDA  : Receive data
    GPIO29/SCITXDA  : Transmit data

    In addition, there is a document entitled "Hardware Design Guidelines for TMS320F28xx and TMS320F28xxx DSCs (spraas1)" that illustrates a typical connection to an RS-232 transceiver device on page 17.

  • 0 in reply to BrandonAzbell
    Prodigy 30 points

    thank you so much for your help mr.BradonAzbell

    but i want to clarify one thing 

    if i have to tranmit and receive data from one channel only , can i directly connect tx rx pins of db9 to

    GPIO28/SCIRXDA  : Receive data
    GPIO29/SCITXDA  : Transmit data

    or do i need SN75LV4737A

    as shown in typical connection to an RS-232 transceiver device on page 17 of   Hardware Design Guidelines for TMS320F28xx .

    your help will be very worthy for my work.

  • 0 in reply to shashank jain53233
    TI__Guru 64620 points

    shashank jain said:

    if i have to tranmit and receive data from one channel only , can i directly connect tx rx pins of db9 to

    GPIO28/SCIRXDA  : Receive data
    GPIO29/SCITXDA  : Transmit data

    You should not connect the pins of the TMS320F28xx directly to the TX and RX pins of the DB9 connector.  The voltage levels are not compatible and you will damage the device.

     

    shashank jain said:

    or do i need SN75LV4737A

    You will need a device like the SN75LV4737A, which is a RS-232 transceiver.  However, as you mentioned, you would not need all of the channels available in that device.  There are other RS-232 transceivers to choose from (I just referenced this document which used the aforementioned device as an example) which can be found at the following selection guide.

    Since you only need 1 RX and 1 TX, the MAX3221 is a viable option.  I don't know what data rate you are expecting.  The MAX3221 has a maximum data rate of 250kbps.

  • 0 in reply to BrandonAzbell
    Prodigy 30 points

    thank you sir

    250kbps can solve my purpose