Analog Devices SHARC ADSP-21368 Hardware Reference Manual page 536

UART Control and Status Registers
programmed through the
UART receive interrupt (0x13 for UART0 interrupt and 0x14 for UART1
receive interrupt). Similar to I/O mode, both the transmit and receive
interrupts are mapped to the receive interrupt. Then the
can be used to select the transmit or receive interrupt respectively for I/O
mode. The following examples show two methods of enabling transmit
DMA in I/O mode. The first method uses the DPI interrupt directly.
Listing 11-1. Enabling Transmit DMA (DPI Direct Method)
bit set mode1 IRPTEN;
bit set imask DPII;
ustat1 = UART0_RX_INT;
dm(DPI_IRPTL_RE) = ustat1; /* enables transmit interrupt in
The second method uses the DPI interrupt by programming the PICR
with the code value of the UART0 receive interrupt (0x13).
Listing 11-2. Enabling Transmit DMA (DPI PICR Method)
#define MASKP14 (0x1f<<10)
#define UART0Rx (0x13<<10)
bit set mode1 IRPTEN;
/* Map the UART0 receive interrupt to P14 using the programmable
interrupt controller */
ustat1 = dm(PICR2);
bit clr ustat1 MASKP14;
bit set ustat1 UART0Rx;
dm(PICR2) = ustat1;
bit set IMASK P14I; /* Unmasks the UART Receive interrupt */
11-8
register using the code select value for the
PICR
/* enables global interrupts */
/* unmasks DPI interrupt */
I/O mode */
ADSP-21368 SHARC Processor Hardware Reference
register
UARTxIER