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Band edges updated

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OneOfEleven
2023-10-22 22:57:47 +01:00
parent bfe2a116e2
commit 69b108e430
10 changed files with 53 additions and 41 deletions
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52
mdc1200.c
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@ -5,13 +5,16 @@
#include "mdc1200.h"
#include "misc.h"
// MDC1200 sync bit reversals and packet header
// MDC1200 sync bit reversals and packet magic
//
// 0000 0111 1011 0111 0010 0100 0000 1001 1001 1010
// 24-bit pre-amble
// 40-bit sync
//
//static const uint8_t header[] = {0x00, 0x00, 0x00, 0x55, 0x55, 0x55, 0x55, 0x07, 0x09, 0x2a, 0x44, 0x6f};
//static const uint8_t header[] = {0x00, 0x00, 0x00, 0xAA, 0xAA, 0xAA, 0xAA, 0x07, 0x09, 0x2a, 0x44, 0x6f};
static const uint8_t header[] = {0x00, 0x00, 0x00, 0xAA, 0xAA, 0xAA, 0xAA, 0x00, 0x97, 0x1f, 0xc4, 0x4e};
//static const uint8_t header[] = {0x00, 0x00, 0x00, 0x00, 0x55, 0x55, 0x55, 0x07, 0x09, 0x2a, 0x44, 0x6f};
//static const uint8_t header[] = {0x00, 0x00, 0x00, 0x00, 0xAA, 0xAA, 0xAA, 0x07, 0x09, 0x2a, 0x44, 0x6f};
//
//static const uint8_t header[] = {0x00, 0x00, 0x00, 0x0A, 0xAA, 0xAA, 0xA0, 0xb6, 0x8e, 0x03, 0xbb, 0x14};
static const uint8_t header[] = {0x00, 0x00, 0x00, 0x00, 0x55, 0x55, 0x50, 0x29, 0x71, 0xfc, 0x44, 0xeb};
uint8_t bit_reverse_8(uint8_t n)
{
@ -71,38 +74,38 @@ uint16_t reverse_bits(const uint16_t bits_in, const unsigned int num_bits)
#else
uint16_t compute_crc(const uint8_t *data, const unsigned int data_len)
{
// this can be done using the CPU's own CRC calculator once we know we're ok
unsigned int i;
#if 0
uint16_t crc;
CRC_CR = (CRC_CR & ~CRC_CR_CRC_EN_MASK) | CRC_CR_CRC_EN_BITS_ENABLE;
#else
uint16_t crc = 0;
#endif
for (i = 0; i < data_len; i++)
{
#if 0
// bit reverse each data byte before adding it to the CRC
// the cortex CPU might have an instruction to bit reverse for us ?
//
CRC_DATAIN = reverse_bits(data[i], 8);
//CRC_DATAIN = bit_reverse_8(data[i]);
#else
uint8_t mask;
// bit reverse each data byte before adding it to the CRC
// the cortex CPU might have an instruction to bit reverse for us ?
//
const uint8_t bits = reverse_bits(data[i], 8);
//const uint8_t bits = bit_reverse_8(*data++);
for (mask = 0x0080; mask != 0; mask >>= 1)
{
uint16_t msb = crc & 0x8000;
@ -114,14 +117,14 @@ uint16_t reverse_bits(const uint16_t bits_in, const unsigned int num_bits)
}
#endif
}
#if 0
crc = (uint16_t)CRC_DATAOUT;
CRC_CR = (CRC_CR & ~CRC_CR_CRC_EN_MASK) | CRC_CR_CRC_EN_BITS_DISABLE;
#endif
// bit reverse and invert the final CRC
return reverse_bits(crc, 16) ^ 0xffff;
return reverse_bits(crc, 16) ^ 0xffff;
// return bit_reverse_16(crc) ^ 0xffff;
}
#endif
@ -188,10 +191,8 @@ void delta_modulation(uint8_t *data, const unsigned int size)
for (bit_num = 7; bit_num >= 0; bit_num--)
{
const uint8_t b2 = (in >> bit_num) & 1u;
// const uint8_t b2 = (in >> (7 - bit_num)) & 1u;
if (b1 != b2)
out |= 1u << bit_num; // previous bit and new bit are different
// out |= 1u << (7 - bit_num);
b1 = b2;
}
data[i] = out;
@ -218,8 +219,15 @@ unsigned int MDC1200_encode_single_packet(uint8_t *data, const uint8_t op, const
p = encode_data(p);
#if 1
{ // op 0x01, arg 0x80, id 0xB183
const uint8_t test_packet[] = {0x07, 0x25, 0xDD, 0xD5, 0x9F, 0xC5, 0x3D, 0x89, 0x2D, 0xBD, 0x57, 0x35, 0xE7, 0x44};
memcpy(data + sizeof(header), test_packet, sizeof(test_packet));
}
#endif
size = (unsigned int)(p - data);
delta_modulation(data, size);
return size;
@ -258,9 +266,9 @@ unsigned int MDC1200_encode_double_packet(uint8_t *data, const uint8_t op, const
p = encode_data(p);
size = (unsigned int)(p - data);
delta_modulation(data, size);
return size;
// return 40;
}