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Hardware flow control connections from GSM modem to MSP430F5419A

Karthikeyan Dhandapani
Prodigy 220 points
Other Parts Discussed in Thread: MSP430F5419A

I need to connect my GSM modem with MSP430F5419A microcontroller. the connections are DCD, RXD, TXD, DTR, GND, DSR, RTS, CTS and RI. If i'm using "Port 3" for UART.

P3.4 AND P3.5 will be UART TXD and UART RXD..

1) Where should i connect the remaining  7 connections?

2) Will the micro-controller does automatic hardware flow control with RTS and CTS (OR) Should i write code accordingly?

3)If so, is there any example code for hardware flow control?

  • 0
    Guru 35525 points

    Karthikeyan Dhandapani said:
    Will the micro-controller does automatic hardware flow control with RTS and CTS

    The Datasheet and/or Family User Guide will tell you this.

  • 0
    Guru 25210 points

    The 5xx family USCI in UART mode does not support hardware-level automatic modem/flow control. You will have to do this in SW.

    Connect the modem control signals to GPIO. (Connect the inputs to interrupt capable I/O's i.e. Port 1 or Port 2 pins). The outputs can be on any port.

  • 0 in reply to Brian Boorman
    Prodigy 30 points

    Hi,

     

    We are in a similar situation where we need flow control on MSP430 to interface to a peripheral. I could not find any reference to a working code with flow control implemented. Please share any code implementations or application notes that address flow control for UART in MSP430.

    Thanks.

  • 0 in reply to Sukanya S
    Guru 46710 points

    Sukanya S said:
    We are in a similar situation where we need flow control on MSP430 to interface to a peripheral. I could not find any reference to a working code with flow control implemented. Please share any code implementations or application notes that address flow control for UART in MSP430.

    When target device is not ready - don't transmit. If you are not ready - do not assert flow control lime. This is basically all you need to know about flow control. Further reading:  http://en.wikipedia.org/wiki/RS-232

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