/
uat.go
196 lines (166 loc) · 8.26 KB
/
uat.go
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package main
import (
"encoding/hex"
"errors"
"fmt"
"math"
"os"
)
/*
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
3c62ab89c854bb7000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
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
*/
/*
Data rate: 1.041667Mbps
*/
/*
#cgo linux LDFLAGS: -L. -lschifra_reed_solomon -lstdc++ -lm
#cgo darwin LDFLAGS: -L. -lschifra_reed_solomon -lstdc++ -lm
#include <stdlib.h>
#include <stdint.h>
extern void doRS(char *buf);
*/
import "C"
import "unsafe"
func doRS(buf []byte) []byte {
if len(buf) != 72 {
panic("doRS(): input not right length.")
}
ret := make([]byte, 0)
ret = append(ret, make([]byte, 163)...)
ret = append(ret, buf...)
C.doRS((*C.char)(unsafe.Pointer(&ret[0])))
fmt.Printf("%d %v\n", len(ret), ret)
ret = ret[235:]
return ret
}
const (
UAT_LONG_LEN = 432 // Bytes.
)
var UPLINK_SYNC_WORD = []bool{false, false, false, true, false, true, false, true, false, false, true, true, false, false, true, false, false, false, true, false, false, true, false, true, true, false, true, true, false, false, false, true, true, true, false, true}
var DOWNLINK_SYNC_WORD = []bool{true, true, true, false, true, false, true, false, true, true, false, false, true, true, false, true, true, true, false, true, true, false, true, false, false, true, false, false, true, true, true, false, false, false, true, false}
func decodeDumpFmt(s string) ([]byte, error) {
// Check to make sure we have either 112 bits or 56 bits in the message.
if len(s) != 2*UAT_LONG_LEN {
return nil, errors.New(fmt.Sprintf("invalid length frame (%d): %s", len(s), s))
}
// Decode to bytes.
b, err := hex.DecodeString(s)
if err != nil {
return nil, err
}
return b, nil
}
func encodeBit(b uint8) bool {
if b != 0 {
return true
}
return false
}
type iq struct {
i int8
q int8
}
func encodePacket(packet []bool) []iq {
ret := make([]iq, 2)
for i := 0; i < len(packet); i++ {
v := make([]iq, 2)
var pos_iq iq
var neg_iq iq
pos_iq.i = int8(50.0*math.Cos(float64(i)*math.Pi/5) + 128)
pos_iq.q = int8(50.0*math.Sin(float64(i)*math.Pi/5) + 128)
neg_iq.i = int8(50.0*math.Sin(float64(i)*math.Pi/5) + 128)
neg_iq.q = int8(-50.0*math.Cos(float64(i)*math.Pi/5) + 128)
if packet[i] {
v[0] = neg_iq
v[1] = pos_iq
} else {
v[0] = pos_iq
v[1] = neg_iq
}
ret = append(ret, v...)
}
return ret
}
// "12.4.4.2.2.3 Interleaving Procedure".
// Returns an array of bytes in transmission order.
func interleavePacket(slicedPacket [][]byte) []byte {
// Assume that all of the internal slices are of the same size.
//FIXME: error checking.
ret := make([]byte, 0)
for i := 0; i < 92; i++ {
for j := 0; j < 6; j++ {
ret = append(ret, slicedPacket[j][i])
}
}
return ret
}
// Expand into bits (bool).
func createPacket(packet []byte) []iq {
// 36 bit preamble.
ret := UPLINK_SYNC_WORD
// Split into 72-byte slices.
slicedPacket := make([][]byte, 0)
for i := 0; i < UAT_LONG_LEN; i += 72 {
slicedPacket = append(slicedPacket, packet[i:i+72])
}
// Reed-Solomon, FEC. "14.4.4.2.2.2 FEC Parity (before interleaving and after de-interleaving)".
for i := 0; i < len(slicedPacket); i++ {
// Append the Reed-Solomon parity bits to the end of the 72 byte row.
rs_p := doRS(slicedPacket[i])
slicedPacket[i] = append(slicedPacket[i], rs_p...)
fmt.Printf("%d (%d): %s\n", i, len(slicedPacket[i]), hex.Dump(slicedPacket[i]))
}
// Interleave the message.
// packet = interleavePacket(packet)
packet = interleavePacket(slicedPacket)
fmt.Printf("done-\n%s\n", hex.Dump(packet))
// Now we translate each bit of 'packet' into a bool value.
for i := 0; i < len(packet); i++ {
ret = append(ret, encodeBit((uint8(packet[i])&0x80)>>7))
ret = append(ret, encodeBit((uint8(packet[i])&0x40)>>6))
ret = append(ret, encodeBit((uint8(packet[i])&0x20)>>5))
ret = append(ret, encodeBit((uint8(packet[i])&0x10)>>4))
ret = append(ret, encodeBit((uint8(packet[i])&0x08)>>3))
ret = append(ret, encodeBit((uint8(packet[i])&0x04)>>2))
ret = append(ret, encodeBit((uint8(packet[i])&0x02)>>1))
ret = append(ret, encodeBit(uint8(packet[i])&0x01))
}
return encodePacket(ret)
}
// Create a []byte that can be output to a file.
func iqFileOut(packet []iq) []byte {
ret := make([]byte, 0)
for _, pkt := range packet {
ret = append(ret, byte(pkt.i))
ret = append(ret, byte(pkt.q))
}
return ret
}
func main() {
ee, _ := hex.DecodeString("0dd90007150b3908050b39c51243b0b80005800021bcc09082102d53cc00082efc1e012d43cc000000000100000fd9000f1300120813000fc46743b25400158000213d1ed082102cb9526ade833b9ee34eb34a04fdb4a1c6d96586a8")
fmt.Printf("a\n%s\n\n", hex.Dump(ee))
eee := doRS(ee[:72])
fmt.Printf("b\n%s\n\n", hex.Dump(eee))
return
testMessage := "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"
f, err := decodeDumpFmt(testMessage)
fmt.Printf("%s\n", hex.Dump(f))
if err != nil {
panic(err)
}
p := createPacket(f)
fmt.Printf("%d\n", len(p))
fOut, err := os.Create("uat.bin")
if err != nil {
panic(err)
}
defer fOut.Close()
outByte := iqFileOut(p)
fmt.Printf("len=%d\n", len(outByte))
fmt.Printf("%s\n", hex.Dump(outByte))
for i := 0; i < 10000; i++ {
fOut.Write(outByte)
}
}