MSP430FR5994: Interrupt in LEA example programs in DSPLib

Hello Rosh,

LEA examples are only one thread applications, I mean all the examples I know.
Try to use any TI-RTOS interrupt driven example application to build your test bed.
In case of any troubles you would not be alone.

Hi Tomasz,

Sorry, I don't understand how you can't have interrupts in a single threaded application ? The code below is from the example in ../MSP430Ware/dsplib/examples/Matrix/matrix_ex3_mpy_q15.c

...
...
    /* Initialize the parameter structure. */
    mpyParams.srcARows = SIGNAL_ROWS1;
    mpyParams.srcACols = SIGNAL_COLS1;
    mpyParams.srcBRows = SIGNAL_ROWS2;
    mpyParams.srcBCols = SIGNAL_COLS2;
    
    /* Invoke the msp_matrix_mpy_q15 API. */
    msp_benchmarkStart(MSP_BENCHMARK_BASE, 1);
    status = msp_matrix_mpy_q15(&mpyParams, *inputA, *inputB, *result); // CPU is blocked ??
    cycleCount = msp_benchmarkStop(MSP_BENCHMARK_BASE);
    msp_checkStatus(status);
    
    /* End of program. */
    __no_operation();
...
...

In the above, it looks as if the CPU will be blocked in the "msp_matrix_mpy_q15" operation until LEA finishes. Is there a way we can setup LEA and ask it to start processing and the CPU can carry on doing other work, when the LEA finishes it can provide an interrupt. This is what it says in the documentation:

"...The LEA begins executing the selected operation when the CPU writes a LEA command to the LEA
command register when the LEA is in idle mode. Before writing the command, the CPU must configure the
LEA argument registers with the pointers to the parameter blocks for the designated operation. The LEA
performs the operation without CPU intervention and triggers an interrupt when the operation is complete...."

I want to know how to setup LEA so it triggers an interrupt when finished (regardless of single/multi threaded application)

Many thanks

Rosh