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initial import of Osmocom TETRA phy and lower MAC code

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Harald Welte 2011-01-19 10:39:59 +01:00
parent a4c4e5a1ab
commit 7ee08faee0
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src/lower_mac/tetra_scramb.h Normal file
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#ifndef TETRA_SCRAMB_H
#define TETRA_SCRAMB_H
/* TETRA scrambling according to Section 8.2.5 of EN 300 392-2 V3.2.1 */
/* This converts from type-4 to type-5 bits (and vice versa) */
#include <stdint.h>
/* Section 8.2.5.2:
* For scrambling of BSCH, all bits e(1) to e(30) shall equal to zero
* p(k) = e(1-k) for k = -29, ... 0
* p(k) = 1 for k = -31, -30
*/
#define SCRAMB_INIT 3
uint32_t tetra_scramb_get_init(uint16_t mcc, uint16_t mnc, uint8_t colour);
int tetra_scramb_get_bits(uint32_t lfsr_init, uint8_t *out, int len);
/* XOR the bitstring at 'out/len' using the TETRA scrambling LFSR */
int tetra_scramb_bits(uint32_t lfsr_init, uint8_t *out, int len);
#endif /* TETRA_SCRAMB_H */