Hi
I am using S32K148 and got a problem with lpuart1 receving.
I use ProcessorExpert to generate code. Below is the UART setting
Transfer type: interrupt
Parity mode: disable
Stop bits: 1
Bits per char: 8
My below function keeps reading continuous bytes in a if statement in main thread.
LPUART_DRV_ReceiveData(INST_LPUART1,&Buffer[BufferCount],1);
The below isr indicates received data for the main thread, and increments the BufferCount.
void rxcallback(void *driverState, uart_event_t event, void *userData)
{
/* Unused parameters */
(void)driverState;
(void)userData;
/* Check the event type */
if (event == UART_EVENT_RX_FULL)
{
uart_flag = 1 // used for indication of rx received
BufferCount++;
}
}
When the LPUART_DRV_IRQHandler is called, it's occationally stuck in the line below for around 1 ms(in the function: LPUART_SetReceiverCmd(base, false);), which causes lost to a byte . (it usually takes 3us for the function: LPUART_SetReceiverCmd(base, false);)
while((bool)((base->CTRL & LPUART_CTRL_RE_MASK) != 0U) != enable) {}
When I comment out the line in lpuart_hw_access.h, the UART works just fine. UART can keep continuous reading steadily. What could be the cause for the mask operation to take this long?
static inline void LPUART_SetReceiverCmd(LPUART_Type * base, bool enable)
{
base->CTRL = (base->CTRL & ~LPUART_CTRL_RE_MASK) | ((enable ? 1UL : 0UL) << LPUART_CTRL_RE_SHIFT);
/* Wait for the register write operation to complete */
// while((bool)((base->CTRL & LPUART_CTRL_RE_MASK) != 0U) != enable) {}
}
an I found a similar problem in here: S32K146 LPUART EDMA failed - NXP Community
The difference is the transfer type only I guess
Best Regards,
Joe
