Analog Devices SHARC ADSP-21368 User Manual (English)

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UART Control and Status Registers

11-8 ADSP-21368 SHARC Processor Hardware Reference

programmed through the

PICR register using the code select value for 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 UARTxIER register

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; /* enables global interrupts */

bit set imask DPII; /* unmasks DPI interrupt */

ustat1 = UART0_RX_INT;

dm(DPI_IRPTL_RE) = ustat1; /* enables transmit interrupt in

I/O mode */

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 */

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Analog Devices SHARC ADSP-21368 Specifications

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