Rx Tx UART interrupt

[mpc8377e]

Hi,

Does MQX gives us a way to know whether the interrupt is for Rx or Tx if i have common ISR for recieving / transmitting for UART, if it has a way then how to know it?

/Raghu

[mpc8377e]

I am testing the UART interrupt on k40 tower module board.

[c0170]

Hi mpc8377e,

your application shares one interrupt for RX and also TX. Simply read the flag which causes the interrupt to be invoked. Are you using kuart int init, because there's _kuart_int_rx_tx_isr function. You can find the source code in source/io/serial.

Regards,

MartinK

[mpc8377e]

Hi Kojito,

I have one more question on ISR:

I have installed my own isr like this:

_int_install_isr(INT_UART3_RX_TX, uart_rx_tx_isr, NULL);
   _cortex_int_init(INT_UART3_RX_TX, 2, TRUE);
   _cortex_int_enable(INT_UART3_RX_TX);     

ISR:

void
uart_rx_tx_isr( pointer user_isr_ptr )

{

volatile int_32 value;

if (sci_ptr->S1 & UART_S1_RDRF_MASK)

{
      value = sci_ptr->D;
   }

By doing this i am unable to get the exact data in varilabe "value". Is there any way to read the exact data from UART? I am testing this on tower module k40.

[mpc8377e]

Hi,

I could able to read the character by adding code like this in ISR:

uart_rx_tx_isr( pointer user_isr_ptr )

{

volatile int_32 data;

if ((UART_S1_REG(UART3_BASE_PTR) & UART_S1_RDRF_MASK))
{
            data = UART_D_REG(UART3_BASE_PTR);    
}

}

But the problem here is that the ISR will trigger only once eventhough the packet has more than 1 byte (ex. 10 bytes), it reads only first byte. The ISR should be triggered 10 times i believe to get the complete packet.

Any suggestions?

I am using kinetis k40 board.