TMS320F28P650DK: uart_ex1_echoback example.

Hi,

I used sysconfg to generate code for UART0 and disabled fifo. In the interrupt routine below, interrupt occurs only for the first character received.

__interrupt void INT_myUART0_ISR(void)
{
UART_clearInterruptStatus(myUART0_BASE, 0xFFFF);
rxdata = HWREG(UARTA_BASE + UART_O_DR);
UART_writeChar(UARTA_BASE, rxdata);
Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP8);
}

In the routine in the main loop below, it works correctly. For each character received it is echoed back.

while(1)
{
rxdata = UART_readChar(UARTA_BASE);
UART_writeChar(UARTA_BASE, rxdata);
}

Why does the interrupt only occur once?

Vince,

 The problem is that I am using the new UART, which is exclusive to the new F28P65x, and there is no working example of it in C2000ware!
The link you sent me is about SCI and the firmware is bitfield based. I need a code example on how to process receiving data from the ISR on the new UART using Driverlib.

Thanks,

 Ari.

Vince,

the uart_ex1_echoback example is the only example for the UART, and this example does not work, if you look at the ISR code of this example, the PIEACK was not cleared, so this example was probably not tested by Texas. 

What could cause this kind of problem would be not clearing the PIEACK, however I verified that the PIEACK register is being cleared after the "Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP8);"  command.

I also noticed that CCS does not show the list of UART registers. I believe it still hasn't been properly updated for the new peripheral.

Could you check internally at Texas if they are working on better support for the UART, with more examples, and with the CCS showing the internal UART registers?