tests/coding: Test decoding of DL EGPRS data packet
Change-Id: Ide23a484b980995f24092d1cfbf062aed58fdf61
diff --git a/tests/coding/coding_test.c b/tests/coding/coding_test.c
index 17ddfaa..417c594 100644
--- a/tests/coding/coding_test.c
+++ b/tests/coding/coding_test.c
@@ -316,7 +316,76 @@
printf("\n");
}
-static void test_pdtch(uint8_t *l2, int len)
+struct test_macblock {
+ bool is_egprs;
+ uint16_t exp_burst_bits;
+ uint16_t l2_len;
+ uint8_t l2[54];
+};
+
+static struct test_macblock test_macblock[] = {
+ /* Random frame */
+ { false,
+ GSM0503_GPRS_BURSTS_NBITS,
+ 54,
+ { 0xa3, 0xaf, 0x5f, 0xc6, 0x36, 0x43, 0x44, 0xab,
+ 0xd9, 0x6d, 0x7d, 0x62, 0x24, 0xc9, 0xd2, 0x92,
+ 0xfa, 0x27, 0x5d, 0x71, 0x7a, 0x59, 0xa8, 0x42,
+ 0xa3, 0xaf, 0x5f, 0xc6, 0x36, 0x43, 0x44, 0xab,
+ 0xa3, 0xaf, 0x5f, 0xc6, 0x36, 0x43, 0x44, 0xab,
+ 0xd9, 0x6d, 0x7d, 0x62, 0x24, 0xc9, 0xd2, 0x92,
+ 0xfa, 0x27, 0x5d, 0x71, 0x7a, 0xa8 }
+ },
+ /* jolly frame */
+ { false,
+ GSM0503_GPRS_BURSTS_NBITS,
+ 23,
+ { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
+ 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10,
+ 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 }
+ },
+/*
+GSM RLC/MAC: EGPRS DL HEADER
+ 0... .... .... 0000 = DL TFI: 0
+ 0... .... crumb 1 of DL TFI (decoded above)
+ .00. .... = RRBP: Reserved Block: (N+13) mod 2715648 (0)
+ ...0 0... = ES/P: RRBP field is not valid (no Polling) (0)
+ .... .111 = USF: 7
+ 01.. .... 0000 0000 .... ...0 = BSN: 1
+ 01.. .... crumb 2 of BSN (decoded above)
+ ..00 .... = PR: 0 dB (included) to 3 dB (excluded) less than BCCH level - P0 (0)
+ .... 0000 crumb 0 of DL TFI (decoded above)
+ 0000 0000 crumb 1 of BSN (decoded above)
+ .00. .... = SPB (DL): No retransmission (0)
+ ...1 011. = CPS: MCS-1/P1 (0x0b)
+ .... ...0 crumb 0 of BSN (decoded above)
+GSM RLC/MAC: EGPRS DL DATA BLOCK 1 (BSN 1)
+ .... ..0. = FBI: Current Block is not last RLC data block in TBF
+ .... ...0 = Extension: Extension octet follows immediately
+ 0000 100. = Length Indicator: 4
+ .... ...0 = Extension: Extension octet follows immediately
+ 0010 000. = Length Indicator: 16
+ .... ...1 = Extension: No extension octet follows
+ data segment: LI[0]=4 indicates: (Last segment of) LLC frame (4 octets)
+ Data (4 bytes)
+ Data: 012b2b2b
+ [Length: 4]
+ data segment: LI[1]=16 indicates: (Last segment of) LLC frame (16 octets)
+ Data (16 bytes)
+ Data: 43c0012b2b2b2b2b2b2b2b2b2b2b2b2b
+ [Length: 16]
+*/
+ { true,
+ GSM0503_GPRS_BURSTS_NBITS,
+ 27,
+ { 0x07, 0x40, 0x00, 0x16, 0x10, 0x42, 0x02, 0x56,
+ 0x56, 0x56, 0x86, 0x80, 0x03, 0x56, 0x56, 0x56,
+ 0x56, 0x56, 0x56, 0x56, 0x56, 0x56, 0x56, 0x56,
+ 0x56, 0x56, 0x00 }
+ },
+};
+
+static void test_pdtch(struct test_macblock *tmb, int len)
{
uint8_t result[len];
ubit_t bursts_u[116 * 4];
@@ -328,19 +397,22 @@
switch (len) {
case 34:
case 54:
- l2[len - 1] &= 0x7f;
+ tmb->l2[len - 1] &= 0x7f;
result[len - 1] &= 0x7f;
break;
case 40:
- l2[len - 1] &= 0x07;
+ tmb->l2[len - 1] &= 0x07;
result[len - 1] &= 0x07;
break;
}
/* Encode L2 message */
- printf("Encoding: %s\n", osmo_hexdump(l2, len));
- rc = gsm0503_pdtch_encode(bursts_u, l2, len);
- CHECK_RC_OR_RET(rc == GSM0503_GPRS_BURSTS_NBITS, "encoding");
+ printf("Encoding: %s\n", osmo_hexdump(tmb->l2, len));
+ if (tmb->is_egprs)
+ rc = gsm0503_pdtch_egprs_encode(bursts_u, tmb->l2, len);
+ else
+ rc = gsm0503_pdtch_encode(bursts_u, tmb->l2, len);
+ CHECK_RC_OR_RET(rc == (int)tmb->exp_burst_bits, "encoding");
/* Prepare soft-bits */
osmo_ubit2sbit(bursts_s, bursts_u, 116 * 4);
@@ -349,15 +421,21 @@
dump_sbits((uint8_t *)bursts_s, 348);
/* Decode */
- rc = gsm0503_pdtch_decode(result, bursts_s, NULL,
- &n_errors, &n_bits_total);
+ if (tmb->is_egprs) {
+ /* gsm0503_pdtch_egprs_decode() is meant to decode EGPRS UL frames, so we cannot use it here */
+ rc = gsm0503_pdtch_egprs_decode(result, bursts_s, rc, NULL, &n_errors, &n_bits_total);
+ OSMO_ASSERT(rc == -EIO);
+ return;
+ } else {
+ rc = gsm0503_pdtch_decode(result, bursts_s, NULL, &n_errors, &n_bits_total);
+ }
CHECK_RC_OR_RET(rc == len, "decoding");
printf("Decoded: %s\n", osmo_hexdump(result, len));
printf("pdtch_decode: n_errors=%d n_bits_total=%d ber=%.2f\n",
n_errors, n_bits_total, (float)n_errors/n_bits_total);
- OSMO_ASSERT(!memcmp(l2, result, len));
+ OSMO_ASSERT(!memcmp(tmb->l2, result, len));
printf("\n");
}
@@ -377,21 +455,6 @@
0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 },
};
-uint8_t test_macblock[][54] = {
- /* Random frame */
- { 0xa3, 0xaf, 0x5f, 0xc6, 0x36, 0x43, 0x44, 0xab,
- 0xd9, 0x6d, 0x7d, 0x62, 0x24, 0xc9, 0xd2, 0x92,
- 0xfa, 0x27, 0x5d, 0x71, 0x7a, 0x59, 0xa8, 0x42,
- 0xa3, 0xaf, 0x5f, 0xc6, 0x36, 0x43, 0x44, 0xab,
- 0xa3, 0xaf, 0x5f, 0xc6, 0x36, 0x43, 0x44, 0xab,
- 0xd9, 0x6d, 0x7d, 0x62, 0x24, 0xc9, 0xd2, 0x92,
- 0xfa, 0x27, 0x5d, 0x71, 0x7a, 0xa8 },
- /* jolly frame */
- { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
- 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10,
- 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 },
-};
-
/* 11-bit Access Burst soft-bits (payload only) from an EGPRS capable phone (BSIC 63) */
static const sbit_t test_rach_11bit[6][36] = {
{ 103, 109, -108, -110, 107, 108, -106, -120, -121,
@@ -480,10 +543,14 @@
test_hr(test_l2[i], sizeof(test_l2[0]));
for (i = 0; i < len_mb; i++) {
- test_pdtch(test_macblock[i], 23);
- test_pdtch(test_macblock[i], 34);
- test_pdtch(test_macblock[i], 40);
- test_pdtch(test_macblock[i], 54);
+ if (test_macblock[i].is_egprs) {
+ test_pdtch(&test_macblock[i], test_macblock[i].l2_len);
+ } else {
+ test_pdtch(&test_macblock[i], 23);
+ test_pdtch(&test_macblock[i], 34);
+ test_pdtch(&test_macblock[i], 40);
+ test_pdtch(&test_macblock[i], 54);
+ }
}
printf("Success\n");