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AD28MSP01

PSTN Signal Port

Analog Devices 

REV. A

AD28msp01

{This ADSP-2101 program initializes the AD28msp01}

{and executes a loopback, or talk-through, routine.}

. MODULE/RAM/BOOT = 0 MSP01;

. VAR/DM/CIRC rec[2];

. VAR/DM/CIRC trans[2];

rset:

irq2v:

sprt0t:

sprt0r:

sprt1t:

sprt1r:

timerv:

JUMP start;

RTI; RTI; RTI;

RTI; RTI; RTI; RTI;

AX0 = 0x25; DM(0x3ff3) = AX0;

RTI; RTI;

JUMP receive;

RTI; RTI; RTI;

RTI; RTI; RTI; RTI;

RTI; RTI; RTI; RTI;

RTI; RTI; RTI; RTI;

start:

init dsp:

init msp01:

initi:

wait:

receive:

I2 = ^re c ;

L2 = %rec;

I3 = ^trans;

L3 = %trans;

M0 = 0;

M1 = 1;

S1 = 0;

DM(0x3000) = SI;

AX0 = 0x2a0f;

DM(0x3ff6) = AX0;

AX0 = 0x101f;

DM(0x3fff) = AX0;

IMASK = 0x10;

AR = 0;

CNTR = 6;

DO initi UNTIL CE;

TX0 = AR;

IDLE;

TX0 = SI;

IDLE;

AY0 = AR;

AR = AY0 +1;

AX1 = 1;

AR = 0x18;

TX0 = AX1;

IDLE;

TX0 = AR;

AR = B#0025;

DM(0x3ff3) = AR;

IMASK = 0x18;

JUMP wait;

DM(0x3ff3) = SI;

AX1= DM(I2, M1);

{Receive word buffer}

{Transmit word buffer}

{lnterrupt Vectors}

{Disable TX autobuffer}

{Initialize DAGs}

{Reset the AD28msp01}

{Initialize the ADSP-2101}

{Ext RFS, Int TfS, Ext SCLK, SLEN = 15}

{SPORT0 control register}

{Enable SPORT0}

{System control register}

{Initialize AD28msp01 control register}

{Note: This section could be autobuffered.}

{Enable SPORT0 TX interrupt}

{Transmit address}

{Transmit control word}

{Increment address}

{Power up AD28msp01}

{Enable RX autobuffering with I2, M1}

{Autobuffer control register}

{Enable RX and TX interrupt}

{Wait for receive interrupt}

{Receive Interrupt Routine}

{Disable autobuffering}

{Read first receive word from buffer}

–5–

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