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#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <unistd.h>
#include "../common/debug.h"
#include "../common/timer.h"
#include "../nmt/nmt.h"
extern int dms_allow_loopback;
static void assert(int condition, char *why)
{
printf("%s = %s\n", why, (condition) ? "TRUE" : "FALSE");
if (!condition) {
printf("\n******************** FAILED ********************\n\n");
exit(-1);
}
}
void ok(void)
{
printf("\n OK ;->\n\n");
sleep(1);
}
static const char testsequence[] = "This is a test for DMS protocol layer. It will test the handing of transfer window. Also it will test what happens, if frames get dropped.";
static const char *check_sequence;
int check_length;
static const uint8_t test_null[][8] = {
{ 0x01, 0x02, 0x02, 0x04, 0x05, 0x06, 0x07, 7 },
{ 0x01, 0x02, 0x02, 0x04, 0x05, 0x06, 0x00, 6 },
{ 0x00, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 5 },
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 1 },
};
static char current_bits[1024], ack_bits[77];
int current_bit_count;
void dms_receive(nmt_t *nmt, const uint8_t *data, int length, int eight_bits)
{
printf("(getting %d digits from DMS layer)\n", length);
assert(!memcmp((const char *)data, check_sequence, length), "Expecting received data to macht");
check_sequence += length;
check_length = length;
}
void dms_all_sent(nmt_t *nmt)
{
}
/* receive bits from DMS */
void fsk_render_frame(nmt_t *nmt, const char *frame, int length, int16_t *sample)
{
printf("(getting %d bits from DMS layer)\n", length);
memcpy(current_bits, frame, length);
current_bit_count = length;
}
nmt_t *alloc_nmt(void)
{
nmt_t *nmt;
nmt = calloc(sizeof(*nmt), 1);
nmt->dms.frame_spl = calloc(1000000, 1);
nmt->samples_per_bit = 40;
dms_reset(nmt);
return nmt;
}
void free_nmt(nmt_t *nmt)
{
free(nmt->dms.frame_spl);
free(nmt);
}
int main(void)
{
nmt_t *nmt;
dms_t *dms;
int i, j;
int16_t sample = 0;
debuglevel = DEBUG_DEBUG;
dms_allow_loopback = 1;
nmt = alloc_nmt();
dms = &nmt->dms;
/* test if frame cycles until we send RAND */
check_sequence = testsequence;
dms_send(nmt, (uint8_t *)testsequence, strlen(testsequence) + 1, 1);
assert(dms->frame_valid && current_bit_count == 127, "Expecting frame in queue with 127 bits");
assert(dms->state.n_s == 1, "Expecting next frame to have sequence number 1");
printf("Pretend that frame has been sent\n");
dms->frame_length = 0;
fsk_dms_frame(nmt, &sample, 1);
assert(dms->frame_valid && current_bit_count == 127, "Expecting frame in queue with 127 bits");
assert(dms->state.n_s == 0, "Expecting next frame to have sequence number 0 (cycles due to unacked RAND)");
printf("Pretend that frame has been sent\n");
dms->frame_length = 0;
fsk_dms_frame(nmt, &sample, 1);
assert(dms->frame_valid && current_bit_count == 127, "Expecting frame in queue with 127 bits");
assert(dms->state.n_s == 1, "Expecting next frame to have sequence number 1");
/* send back ID */
printf("Sending back ID\n");
for (i = 0; i < current_bit_count; i++)
fsk_receive_bit_dms(nmt, current_bits[i] & 1, 1.0, 1.0);
printf("Pretend that frame has been sent\n");
dms->frame_length = 0;
fsk_dms_frame(nmt, &sample, 1);
assert(dms->frame_valid && current_bit_count == 77, "Expecting frame in queue with 77 bits");
printf("Pretend that frame has been sent\n");
dms->frame_length = 0;
fsk_dms_frame(nmt, &sample, 1);
assert(dms->frame_valid && current_bit_count == 127, "Expecting frame in queue with 127 bits");
assert(dms->state.n_s == 0, "Expecting next frame to have sequence number 0");
/* send back RAND */
printf("Sending back RAND\n");
for (i = 0; i < current_bit_count; i++)
fsk_receive_bit_dms(nmt, current_bits[i] & 1, 1.0, 1.0);
printf("Pretend that frame has been sent\n");
dms->frame_length = 0;
fsk_dms_frame(nmt, &sample, 1);
assert(dms->frame_valid && current_bit_count == 77, "Expecting frame in queue with 77 bits");
memcpy(ack_bits, current_bits, 77);
/* check if DT frame will be sent now */
printf("Pretend that frame has been sent\n");
dms->frame_length = 0;
fsk_dms_frame(nmt, &sample, 1);
assert(dms->frame_valid && current_bit_count == 127, "Expecting frame in queue with 127 bits");
assert(dms->state.n_s == 1, "Expecting next frame to have sequence number 1");
printf("Pretend that frame has been sent\n");
dms->frame_length = 0;
fsk_dms_frame(nmt, &sample, 1);
assert(dms->frame_valid && current_bit_count == 127, "Expecting frame in queue with 127 bits");
assert(dms->state.n_s == 2, "Expecting next frame to have sequence number 2");
printf("Pretend that frame has been sent\n");
dms->frame_length = 0;
fsk_dms_frame(nmt, &sample, 1);
assert(dms->frame_valid && current_bit_count == 127, "Expecting frame in queue with 127 bits");
assert(dms->state.n_s == 3, "Expecting next frame to have sequence number 3");
printf("Pretend that frame has been sent\n");
dms->frame_length = 0;
fsk_dms_frame(nmt, &sample, 1);
assert(dms->frame_valid && current_bit_count == 127, "Expecting frame in queue with 127 bits");
assert(dms->state.n_s == 0, "Expecting next frame to have sequence number 0");
/* send back ack bitss */
printf("Sending back RR(2)\n");
memcpy(current_bits, ack_bits, 77);
current_bit_count = 77;
for (i = 0; i < current_bit_count; i++)
fsk_receive_bit_dms(nmt, current_bits[i] & 1, 1.0, 1.0);
printf("Pretend that frame has been sent\n");
dms->frame_length = 0;
fsk_dms_frame(nmt, &sample, 1);
assert(dms->frame_valid && current_bit_count == 127, "Expecting frame in queue with 127 bits");
assert(dms->state.n_s == 3, "Expecting next frame to have sequence number 0");
ok();
/* loopback frames */
printf("pipe through all data\n");
while (check_sequence[0]) {
printf("Sending back last received frame\n");
for (i = 0; i < current_bit_count; i++)
fsk_receive_bit_dms(nmt, current_bits[i] & 1, 1.0, 1.0);
printf("Pretend that frame has been sent\n");
dms->frame_length = 0;
fsk_dms_frame(nmt, &sample, 1);
}
ok();
debuglevel = DEBUG_INFO;
/* test again with pseudo random packet dropps */
srandom(0);
free_nmt(nmt);
nmt = alloc_nmt();
dms = &nmt->dms;
check_sequence = testsequence;
dms_send(nmt, (uint8_t *)testsequence, strlen(testsequence) + 1, 1);
/* loopback frames */
printf("pipe through all data\n");
while (check_sequence[0]) {
if ((random() & 1)) {
printf("Sending back last received frame\n");
for (i = 0; i < current_bit_count; i++)
fsk_receive_bit_dms(nmt, current_bits[i] & 1, 1.0, 1.0);
}
printf("Pretend that frame has been sent\n");
dms->frame_length = 0;
fsk_dms_frame(nmt, &sample, 1);
}
ok();
free_nmt(nmt);
nmt = alloc_nmt();
dms = &nmt->dms;
/* test zero termination */
for (j = 0; j < 4; j++) {
current_bit_count = 0;
printf("zero-termination test: %d bytes in frame\n", test_null[j][7]);
dms_send(nmt, test_null[j], test_null[j][7], 1);
check_sequence = (char *)test_null[j];
while (current_bit_count) {
printf("Sending back last received frame\n");
for (i = 0; i < current_bit_count; i++)
fsk_receive_bit_dms(nmt, current_bits[i] & 1, 1.0, 1.0);
current_bit_count = 0;
printf("Pretend that frame has been sent\n");
dms->frame_length = 0;
fsk_dms_frame(nmt, &sample, 1);
}
assert(check_length == test_null[j][7], "Expecting received length to match transmitted length");
}
ok();
return 0;
}
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