How to use S32K144 TRGMUX_IN0 trigger LPUART send data?

[PYGC]

I need a sample code.

void init_trgmux(void)
{
    // TRGMUX_IN0
    PCC->PCCn[PCC_PORTB_INDEX] = PCC_PCCn_CGC(1);
    PORTB->PCR[5]= PORT_PCR_MUX(6);

    // TRGMUX_LPUART1_INDEX
    TRGMUX->TRGMUXn[TRGMUX_LPUART1_INDEX] &= TRGMUX_TRGMUXn_SEL0_MASK;
    TRGMUX->TRGMUXn[TRGMUX_LPUART1_INDEX] |= TRGMUX_TRGMUXn_SEL0(TRGMUX_TRIG_SOURCE_TRGMUX_IN0);
}

[PetrS · Accepted solution]

Hi,

what do you want to achieve in fact? E.g. use TRGMUX_IN0 as hw control flow signal for LPUART transmit? Similarly as CTS_B input does?.
As chapter 53.4.8.2 states the LPUART supports one peripheral input trigger (from TRGMUX), that can be configured in one of the following ways.

Configuration is done in PINCFG register.

BR, Petr

[PYGC]

Thank you so much!

I found the order of execution:

1. Configure TRGMUX
2. Configure LPUART (including PINCFG)
3. Write TX data
4. Wait for TRGMUX trigger signal
5. When the trigger signal is asserted, the TX data is automatically sent