I want to know S32K1xx LIN Send Header, the principle of send PID?
I found below function will sent PID: LIN_LPUART_DRV_ProcessFrameHeader(**) which local in function LIN_LPUART_DRV_ProcessFrame(***) ，this function is only called in LIN IRQ function：LIN_LPUART_DRV_IRQHandler(***)，detail code is：
else
{
if (LPUART_GetStatusFlag(base, LPUART_RX_DATA_REG_FULL))
{
/* Get data from Data Register & Clear LPUART_RX_DATA_REG_FULL flag */
LPUART_Getchar(base, &tmpByte);
/* Process data in Data Register while receive, send data */
LIN_LPUART_DRV_ProcessFrame(instance, tmpByte);
}
}
if (***) statement is true only if the LPUART_RX_DATA_REG_FULL flag is set, but why this flag can be set when Master sent sync field successed . Did the Slave send data to the master at this time(Master sent sync field successed)? otherwise，I think LPUART_RX_DATA_REG_FULL can not be set automatically。
