From 917a7f7754e47567bf9102b6c26b6649ae6b28dd Mon Sep 17 00:00:00 2001 From: Josh Allen Date: Fri, 10 Feb 2017 06:33:38 -0500 Subject: add initial ootx decoder --- tools/ootx_decode/HMD_Datagen.c | 99 ++++++++++++++++++++++++++++++++++ tools/ootx_decode/Makefile | 7 +++ tools/ootx_decode/crc32.c | 103 +++++++++++++++++++++++++++++++++++ tools/ootx_decode/ootx_decode.c | 50 +++++++++++++++++ tools/ootx_decode/ootx_decoder.c | 112 +++++++++++++++++++++++++++++++++++++++ tools/ootx_decode/ootx_decoder.h | 21 ++++++++ 6 files changed, 392 insertions(+) create mode 100644 tools/ootx_decode/HMD_Datagen.c create mode 100644 tools/ootx_decode/Makefile create mode 100644 tools/ootx_decode/crc32.c create mode 100644 tools/ootx_decode/ootx_decode.c create mode 100644 tools/ootx_decode/ootx_decoder.c create mode 100644 tools/ootx_decode/ootx_decoder.h (limited to 'tools') diff --git a/tools/ootx_decode/HMD_Datagen.c b/tools/ootx_decode/HMD_Datagen.c new file mode 100644 index 0000000..d71d291 --- /dev/null +++ b/tools/ootx_decode/HMD_Datagen.c @@ -0,0 +1,99 @@ +// (C) 2016 Joshua Allen, MIT/x11 License. +// +//All MIT/x11 Licensed Code in this file may be relicensed freely under the GPL or LGPL licenses. + +/* generate data to test ootx decoding */ + +#include +#include +#include +#include +#include + +uint32_t time_stamp = -525198892; + +char* fmt_str = "L Y HMD %d 5 1 206230 %d\n"; + +void print_bit(uint8_t data); +void print_preamble(); +void print_uint16(uint16_t d); +void print_uint32(uint32_t d); +void print_payload(char* data, uint16_t length); +uint32_t crc32(uint32_t crc, uint8_t *buf, size_t size); + +int main(int argc, char* argv[]) +{ + char* str = "Hello World!"; +// printf("%s\n", str); + + srand(time(NULL)); + + print_preamble(); + + uint16_t payload_lenth = strlen(str); + uint32_t crc = crc32(0xffffffff,(uint8_t*)str,payload_lenth); + + print_uint16(payload_lenth); + print_payload(str,payload_lenth); + print_uint32(crc); + + return 0; +} + +void print_preamble() { + int i; + for (i=0;i<17;++i) print_bit(0); + print_bit(1); +} + +void print_uint16(uint16_t d) { + int i; + for (i=0;i<16;++i) { + print_bit(d & 0x0001); + d>>=1; + } + print_bit(1); +} + +void print_uint32(uint32_t d) { + int i = 0; + for (;i<16;++i) { + print_bit(d & 0x01); + d>>=1; + } + print_bit(1); + + for (;i<32;++i) { + print_bit(d & 0x01); + d>>=1; + } + print_bit(1); +} + +void print_payload(char* data, uint16_t length) { + int i; + for(i=0;i=2000) { length-=2000; y = 0x01; } + if (length>=1000) { length-=1000; dbit = 0x01; } + if (length>=500) { x = 0x01; } + */ + + //fire off a callback when a full OOTX packet is received +} \ No newline at end of file diff --git a/tools/ootx_decode/Makefile b/tools/ootx_decode/Makefile new file mode 100644 index 0000000..f72cbb5 --- /dev/null +++ b/tools/ootx_decode/Makefile @@ -0,0 +1,7 @@ +all: ootx_decode hmd_datagen + +hmd_datagen: HMD_Datagen.c crc32.c + gcc -Wall HMD_Datagen.c crc32.c -o hmd_datagen + +ootx_decode: ootx_decode.c ootx_decoder.c ootx_decoder.h + gcc -Wall ootx_decode.c ootx_decoder.c -o ootx_decode \ No newline at end of file diff --git a/tools/ootx_decode/crc32.c b/tools/ootx_decode/crc32.c new file mode 100644 index 0000000..a719cbf --- /dev/null +++ b/tools/ootx_decode/crc32.c @@ -0,0 +1,103 @@ +/*- + * COPYRIGHT (C) 1986 Gary S. Brown. You may use this program, or + * code or tables extracted from it, as desired without restriction. + * + * First, the polynomial itself and its table of feedback terms. The + * polynomial is + * X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0 + * + * Note that we take it "backwards" and put the highest-order term in + * the lowest-order bit. The X^32 term is "implied"; the LSB is the + * X^31 term, etc. The X^0 term (usually shown as "+1") results in + * the MSB being 1 + * + * Note that the usual hardware shift register implementation, which + * is what we're using (we're merely optimizing it by doing eight-bit + * chunks at a time) shifts bits into the lowest-order term. In our + * implementation, that means shifting towards the right. Why do we + * do it this way? Because the calculated CRC must be transmitted in + * order from highest-order term to lowest-order term. UARTs transmit + * characters in order from LSB to MSB. By storing the CRC this way + * we hand it to the UART in the order low-byte to high-byte; the UART + * sends each low-bit to hight-bit; and the result is transmission bit + * by bit from highest- to lowest-order term without requiring any bit + * shuffling on our part. Reception works similarly + * + * The feedback terms table consists of 256, 32-bit entries. Notes + * + * The table can be generated at runtime if desired; code to do so + * is shown later. It might not be obvious, but the feedback + * terms simply represent the results of eight shift/xor opera + * tions for all combinations of data and CRC register values + * + * The values must be right-shifted by eight bits by the "updcrc + * logic; the shift must be unsigned (bring in zeroes). On some + * hardware you could probably optimize the shift in assembler by + * using byte-swap instructions + * polynomial $edb88320 + * + * + * CRC32 code derived from work by Gary S. Brown. + */ + +#include +#include + +static uint32_t crc32_tab[] = { + 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, + 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, + 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, + 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, + 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, + 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, + 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, + 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, + 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, + 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, + 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106, + 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, + 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, + 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, + 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, + 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, + 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, + 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, + 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, + 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, + 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, + 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, + 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, + 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, + 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, + 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, + 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, + 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, + 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, + 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, + 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, + 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, + 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, + 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, + 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, + 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, + 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, + 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, + 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, + 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, + 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, + 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, + 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d +}; + +uint32_t crc32(uint32_t crc, const void *buf, size_t size) +{ + const uint8_t *p; + + p = buf; + crc = crc ^ ~0U; + + while (size--) + crc = crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8); + + return crc ^ ~0U; +} diff --git a/tools/ootx_decode/ootx_decode.c b/tools/ootx_decode/ootx_decode.c new file mode 100644 index 0000000..803b39e --- /dev/null +++ b/tools/ootx_decode/ootx_decode.c @@ -0,0 +1,50 @@ +// (C) 2016 Joshua Allen, MIT/x11 License. +// +//All MIT/x11 Licensed Code in this file may be relicensed freely under the GPL or LGPL licenses. + +/* ootx data decoder test*/ + +#include +#include +#include +#include +#include + +#include "ootx_decoder.h" + +//char* fmt_str = "L Y HMD %d 5 1 206230 %d\n"; +//extern std::istream cin; + +void my_test(ootx_packet* packet) { + packet->data[packet->length] = 0; + printf("%d %s 0x%X\n", packet->length, packet->data, packet->crc32); +} + +int main(int argc, char* argv[]) +{ + ootx_init_buffer(); + ootx_packet_clbk = my_test; + + char* line = NULL; + size_t line_len = 0; + char trash[100] = ""; + uint32_t ticks = 0x00; + + while (getline(&line,&line_len,stdin)>0) { +// printf("%s\n", line); + sscanf(line,"%s %s %s %s %s %s %s %d", + trash, + trash, + trash, + trash, + trash, + trash, + trash, + &ticks); +// printf("%d\n", ticks); + + ootx_process_bit(ticks); + } + + return 0; +} \ No newline at end of file diff --git a/tools/ootx_decode/ootx_decoder.c b/tools/ootx_decode/ootx_decoder.c new file mode 100644 index 0000000..70a88b5 --- /dev/null +++ b/tools/ootx_decode/ootx_decoder.c @@ -0,0 +1,112 @@ +// (C) 2016 Joshua Allen, MIT/x11 License. +// +//All MIT/x11 Licensed Code in this file may be relicensed freely under the GPL or LGPL licenses. + +/* ootx data decoder */ + +#include +#include + +#include +#include "ootx_decoder.h" + +//char* fmt_str = "L Y HMD %d 5 1 206230 %d\n"; + +#define MAX_BUFF_SIZE 1024 +uint8_t* buffer = NULL; +uint16_t buf_offset = 0; +uint8_t bits_written = 0; +uint16_t* payload_size = NULL; + +void (*ootx_packet_clbk)(ootx_packet* packet) = NULL; + +void ootx_init_buffer() { + buffer = (uint8_t*)malloc(MAX_BUFF_SIZE); + payload_size = (uint16_t*)buffer; + *payload_size = 0; +} + +uint8_t ootx_decode_bit(uint32_t length) { + length = ((length/500)*500)+500; + + length-=3000; + if (length>=2000) { length-=2000; } + if (length>=1000) { return 0x01; } + + return 0x00; +} + +uint8_t ootx_detect_preamble(uint8_t dbit) { + static uint32_t preamble = 0x00; + preamble <<= 1; + preamble |= dbit; + if ((preamble & 0x0001ffff) == 0x01) return 1; + return 0; +} + +void ootx_reset_buffer() { + buf_offset = 0; + buffer[buf_offset] = 0; + bits_written = 0; + *payload_size = 0; +} + +void ootx_inc_buffer_offset() { + ++buf_offset; +// if (buf_offset>=MAX_BUFF_SIZE) buf_offset = 0; + assert(buf_offset>= 1; + *current_byte |= (0x80 * dbit); + ++bits_written; + if (bits_written>7) { + bits_written=0; +// printf("%d\n", *current_byte); + ootx_inc_buffer_offset(); + } +} + +void ootx_process_bit(uint32_t length) { + static uint8_t bits_processed = 0; + + uint8_t dbit = ootx_decode_bit(length); + ++bits_processed; + +// printf("z %d %d\n", bits_processed,dbit); +// printf("d %d\n", bits_processed,dbit); + + if ( ootx_detect_preamble(dbit) ) { + /* data stream can start over at any time so we must + always look for preamble bits */ +// printf("Preamble found\n"); + ootx_reset_buffer(); + bits_processed = 0; + } + else if(bits_processed>16) { + //every 17th bit needs to be dropped +// printf("drop %d\n", dbit); + bits_processed = 0; + } + else + { + ootx_write_to_buffer(dbit); + + if (buf_offset >= (*payload_size+6)) { + /* once we have a complete ootx packet, send it out in the callback */ + ootx_packet op; + + op.length = *(uint16_t*)buffer; + op.data = buffer+2; + op.crc32 = *(uint32_t*)(buffer+2+op.length); + if (ootx_packet_clbk) ootx_packet_clbk(&op); + + ootx_reset_buffer(); + } + } +} + diff --git a/tools/ootx_decode/ootx_decoder.h b/tools/ootx_decode/ootx_decoder.h new file mode 100644 index 0000000..b714b53 --- /dev/null +++ b/tools/ootx_decode/ootx_decoder.h @@ -0,0 +1,21 @@ +// (C) 2016 Joshua Allen, MIT/x11 License. +// +//All MIT/x11 Licensed Code in this file may be relicensed freely under the GPL or LGPL licenses. + +#ifndef OOTX_DECODER_H +#define OOTX_DECODER_H + +#include + +typedef struct { + uint16_t length; + uint8_t* data; + uint32_t crc32; +} ootx_packet; + +void ootx_init_buffer(); +void ootx_process_bit(uint32_t length); + +extern void (*ootx_packet_clbk)(ootx_packet* packet); + +#endif \ No newline at end of file -- cgit v1.2.3