Hi at all,
my problem is to flush the RX FIFO of the UART module (MK10DX128VLH7). I don't know
why the FIFO isn't empty if I do the flush command.
The Function:
The PC sends two Bytes to the uC. For example "0x1111" or "0x2222". Depending on this command,
the uC should do some different things, until there is a stop command. For example "0x3333".
This function works very well!
My problem is to capture a fault command or a command which is sent out with the wrong baud rate.
In this case, I would like to do a RX FLUSH command and wait for the next "interpretable" command.
The UART Initialisation:
SIM_SCGC4 |= SIM_SCGC4_UART1_MASK;
UART1_C2 = 0x00; // Turn the UART module off
UART1_RWFIFO = 0x02; // Set the RX FIFO TDRE flag to 2Bytes
UART1_TWFIFO = 0x02; // Set the TX FIFO TDRE flag to 2Bytes
UART1_PFIFO |= UART_PFIFO_RXFE_MASK; // Enable the RX FIFO
UART1_PFIFO |= UART_PFIFO_TXFE_MASK; // Enable the TX FIFO
UART1_CFIFO |= UART_CFIFO_RXFLUSH_MASK; // FLUSH the RX FIFO (initialisation)
UART1_CFIFO |= UART_CFIFO_TXFLUSH_MASK; // FLUSH the TX FIFO (initialisation)
// Set the BUAD RATE
UART1_BDH = baud_rate_tmp>>8;
UART1_BDL = baud_rate_tmp;
UART1_C4 = 0x00
| BFRA_tmp;
UART1_C2 = 0x00
|UART_C2_TE_MASK // Enable Transmitter
|UART_C2_RE_MASK; // Enable Receiver
INTERRUPT_CONFIG(UART1_IRQ,interrupt_en,3); /* Initialize the interrupt */
The UART Interrupt:
void UART1_isr(void)
{
uint16_t rxd_tmp = 0; /* Temporary receive variable */
if ((UART1_S1&UART_S1_RDRF_MASK) >= 1) /* Check if the Receive Data Register Full Flag is set */
{
rxd_tmp |= UART1_D;
rxd_tmp = rxd_tmp<<8;
rxd_tmp |= UART1_D;
UART1_CFIFO |= UART_CFIFO_RXFLUSH_MASK; //That doesn't work!
switch(rxd_tmp)
{
case COMMAND1:
State = 1;
break;
case COMMAND2:
State = 2;
break;
case COMMAND3:
State = 3;
break;
default:
break;
}
}
}
Thank you!
Pascal
