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LAUNCHXL-CC1312R1: CC1312 UART_read() error

Yue Zhang65
Intellectual 500 points
Part Number: LAUNCHXL-CC1312R1

Hi,

I have a question for the CC1312 UART_read() function, if I get '-1' return, how do i clear it? I only read one character a time and if (-1) returns  I try to read again but it will not clear the error.

thanks,

-Yue

  • 0
    TI__Genius 15590 points

    Hi Yue,

    I found this tidbit in UART.h:

    *
 *  The UART driver allows full duplex data transfers. Therefore, it is
 *  possible to call UART_read() and UART_write() at the same time (for
 *  either blocking or callback modes). It is not possible, however,
 *  to issue multiple concurrent operations in the same direction.
 *  For example, if one thread calls UART_read(uart0, buffer0...),
 *  any other thread attempting UART_read(uart0, buffer1...) will result in
 *  an error of UART_STATUS_ERROR, until all the data from the first UART_read()
 *  has been transferred to buffer0. This applies to both blocking and
 *  and callback modes. So applications must either synchronize
 *  UART_read() (or UART_write()) calls that use the same UART handle, or
 *  check for the UART_STATUS_ERROR return code indicating that a transfer is
 *  still ongoing.
 *

    I recommend familiarizing yourself with the UART driver documentation which can be found here: http://dev.ti.com/tirex/explore/node?node=AC8u7w1s19wuF9tmHrn.Vw__pTTHBmu__LATEST 

    Thanks,

    Alexis