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Code Issues Releases Activity

MDC1200 TX now working

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OneOfEleven
2023-10-24 22:41:09 +01:00
parent a94f99130f
commit da2e55fecd
6 changed files with 54 additions and 31 deletions
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62
mdc1200.c
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@ -2,19 +2,16 @@
#include <string.h>
#include "bsp/dp32g030/crc.h"
#include "driver/uart.h"
#include "mdc1200.h"
#include "misc.h"
// MDC1200 sync bit reversals and packet magic
// MDC1200 sync bit reversals and packet sync
//
// 24-bit pre-amble
// 40-bit sync
//
//static const uint8_t header[] = {0x00, 0x00, 0x05, 0x55, 0x55, 0x55, 0x55, 0x07, 0x09, 0x2a, 0x44, 0x6f};
//static const uint8_t header[] = {0x00, 0x00, 0x0A, 0xAA, 0xAA, 0xAA, 0xAA, 0x07, 0x09, 0x2a, 0x44, 0x6f};
//
//static const uint8_t header[] = {0x00, 0x00, 0x0A, 0xAA, 0xAA, 0xAA, 0xA0, 0xb6, 0x8e, 0x03, 0xbb, 0x14};
static const uint8_t header[] = {0x00, 0x00, 0x05, 0x55, 0x55, 0x55, 0x50, 0x29, 0x71, 0xfc, 0x44, 0xeb};
static const uint8_t header[] = {0x55, 0x55, 0x55, 0x00, 0x00, 0x00, 0x00, 0x0A, 0x07, 0x09, 0x2a, 0x44, 0x6f};
uint8_t bit_reverse_8(uint8_t n)
{
@ -263,7 +260,18 @@ uint8_t * encode_data(uint8_t *data)
data[FEC_K + i] = bo;
}
}
/*
#if defined(ENABLE_UART) && defined(ENABLE_UART_DEBUG)
{
const unsigned int size = FEC_K * 2;
unsigned int i;
UART_printf("mdc1200 tx1 %u ", size);
for (i = 0; i < size; i++)
UART_printf(" %02X", data[i]);
UART_SendText("\r\n");
}
#endif
*/
{ // interleave the bits
unsigned int i;
@ -285,7 +293,7 @@ uint8_t * encode_data(uint8_t *data)
}
}
// copy the interleaved bits back to the input/output buffer
// copy the interleaved bits back to the data buffer
for (i = 0, k = 0; i < (FEC_K * 2); i++)
{
int bit_num;
@ -301,22 +309,22 @@ uint8_t * encode_data(uint8_t *data)
}
void delta_modulation(uint8_t *data, const unsigned int size)
{ // xor succesive bits in the entire packet, including the bit reversing pre-amble
uint8_t b1;
{ // exclusive-or succesive bits
unsigned int i;
for (i = 0, b1 = 1u; i < size; i++)
uint8_t prev_bit = 0;
for (i = 0; i < size; i++)
{
int bit_num;
uint8_t in = data[i];
uint8_t out = 0;
for (bit_num = 7; bit_num >= 0; bit_num--)
{
const uint8_t b2 = (in >> bit_num) & 1u;
if (b1 != b2)
out |= 1u << bit_num; // previous bit and new bit are different
b1 = b2;
const uint8_t new_bit = (in >> bit_num) & 1u;
if (new_bit != prev_bit)
out |= 1u << bit_num; // previous bit and new bit are different - send a '1'
prev_bit = new_bit;
}
data[i] = out;
data[i] = out ^ 0xff;
}
}
@ -340,18 +348,18 @@ unsigned int MDC1200_encode_single_packet(uint8_t *data, const uint8_t op, const
p = encode_data(p);
#if 0
{ // test packet
//
// 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);
/*
#if defined(ENABLE_UART) && defined(ENABLE_UART_DEBUG)
{
unsigned int i;
UART_printf("mdc1200 tx2 %u ", size);
for (i = 0; i < size; i++)
UART_printf(" %02X", data[i]);
UART_SendText("\r\n");
}
#endif
*/
delta_modulation(data, size);
return size;