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/*

 * This test covers the four block OUT instructions OUTI, OUTD,

 * OTIR, and OTDR.  The test works by first creating a buffer

 * of data, then doing a block-out instruction from the buffer

 * to a special checksum output port.

 *

 * The test self-checks by performing a checksum of the buffer

 * and comparing it with the result read out of the checksum

 * port.

 */

#include "tv80_env.h"

#define BUF_SIZE 128

char buf[BUF_SIZE];

char cksum_up (char *buf, char len) {

  // pointer should be in 4(ix) and 5(ix), length in 6(ix)

  cksum_value = 0;

  _asm

    ld   l, 4(ix)

    ld   h, 5(ix)

    ld   b, 6(ix)

    ld   c, #_cksum_accum

    otir

    in   a, (_cksum_value)

    ld   l, a

  _endasm;

}

char cksum_dn (char *buf, char len) {

  // pointer should be in 4(ix) and 5(ix), length in 6(ix)

  cksum_value = 0;

  //buf += BUF_SIZE-1;

  _asm

    ld   de, #127

    ld   l, 4(ix)

    ld   h, 5(ix)

    add  hl, de

    ld   b, 6(ix)

    ld   c, #_cksum_accum

    otdr

    in   a, (_cksum_value)

    ld   l, a

  _endasm;

}

char cksum_up_sn (char *buf, char len) {

  // pointer should be in 4(ix) and 5(ix), length in 6(ix)

  cksum_value = 0;

  _asm

    ld   l, 4(ix)

    ld   h, 5(ix)

    ld   b, 6(ix)

    ld   c, #_cksum_accum

    ld   a, #0

cksum_up_sn_loop:

    outi

    cp   b

    jp   nz, cksum_up_sn_loop

    in   a, (_cksum_value)

    ld   l, a

  _endasm;

}

char cksum_dn_sn (char *buf, char len) {

  // pointer should be in 4(ix) and 5(ix), length in 6(ix)

  cksum_value = 0;

  _asm

    ld   de, #127

    ld   l, 4(ix)

    ld   h, 5(ix)

    add  hl, de

    ld   b, 6(ix)

    ld   c, #_cksum_accum

    ld   a, #0

cksum_dn_sn_loop:

    outd

    cp   b

    jp   nz, cksum_dn_sn_loop

    in   a, (_cksum_value)

    ld   l, a

  _endasm;

}

char cksum_asm (char *buf, char len) {

  _asm

    ld   l, 4(ix)

    ld   h, 5(ix)

    ld   b, 6(ix)

    ld   c, #0

    cksum_asm_loop:

    ld   a, c

    add  a, (hl)

    ld   c, a

    inc  hl

    djnz cksum_asm_loop

    ld   l, c

  _endasm;

}

char cksum_sw (char *buf, char len) {

  char rv, i;

  rv = 0;

  for (i=0; i<len; i++) {

    rv += buf[i];

  }

  return rv;

}

int main ()

{

  char i, cs_a, cs_b;

  max_timeout_high = 0xff;

  for (i=0; i<BUF_SIZE; i=i+1) {

    buf[i] = i+1;

  }

  print ("Checking OTIR\n");

  cs_a = cksum_asm (buf, BUF_SIZE);

  cs_b = cksum_up  (buf, BUF_SIZE);

  if (cs_a != cs_b)

    sim_ctl (SC_TEST_FAILED);

  print ("Checking OTDR\n");

  cs_b = cksum_dn  (buf, BUF_SIZE);

  if (cs_a != cs_b)

    sim_ctl (SC_TEST_FAILED);

  print ("Checking OUTI\n");

  cs_b = cksum_up_sn (buf, BUF_SIZE);

  if (cs_a != cs_b)

    sim_ctl (SC_TEST_FAILED);

  print ("Checking OUTD\n");

  cs_b = cksum_dn_sn (buf, BUF_SIZE);

  if (cs_a == cs_b)

    sim_ctl (SC_TEST_PASSED);

  else

    sim_ctl (SC_TEST_FAILED);

  return 0;

}