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Code Issues Releases Activity

Fix default front end gain setting

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OneOfEleven
2023-10-25 21:05:47 +01:00
parent 30dfb07004
commit eec77fb93c
8 changed files with 78 additions and 56 deletions
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61
mdc1200.c
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@ -9,13 +9,16 @@
#define FEC_K 7
// MDC1200 sync bit reversals and packet sync
// **********************************************************
// pre-amble and sync pattern
//
// >= 24-bit pre-amble
// 40-bit sync
// 40-bit sync
//
static const uint8_t pre_amble[] = {0x00, 0x00, 0x00, 0x00, 0x00};
static const uint8_t sync[] = {0xCC, 0x07, 0x09, 0x2a, 0x44, 0x6f};
static const uint8_t pre_amble[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0xCC};
static const uint8_t sync[] = {0x07, 0x09, 0x2a, 0x44, 0x6f};
/*
uint8_t bit_reverse_8(uint8_t n)
{
@ -45,6 +48,7 @@ uint32_t bit_reverse_32(uint32_t n)
}
*/
// ************************************
// common
#if 0
@ -105,6 +109,7 @@ uint32_t bit_reverse_32(uint32_t n)
#endif
// ************************************
// RX
void error_correction(uint8_t *data)
{ // can correct up to 3 or 4 corrupted bits (I think)
@ -147,26 +152,6 @@ void error_correction(uint8_t *data)
}
}
}
void xor_modulation(uint8_t *data, const unsigned int size)
{ // exclusive-or succesive bits - the entire packet
unsigned int 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 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 ^ 0xff;
}
}
/*
void xor_demodulation(uint8_t *data, const unsigned int size, const bool sync_inverted)
{
@ -256,6 +241,29 @@ bool decode_data(uint8_t *data)
return (crc1 == crc2) ? true : false;
}
// **********************************************************
// TX
void xor_modulation(uint8_t *data, const unsigned int size)
{ // exclusive-or succesive bits - the entire packet
unsigned int 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 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 ^ 0xff;
}
}
uint8_t * encode_data(uint8_t *data)
{
// R=1/2 K=7 convolutional coder
@ -431,6 +439,9 @@ unsigned int MDC1200_encode_double_packet(uint8_t *data, const uint8_t op, const
}
*/
// **********************************************************
// RX
struct {
uint8_t bit;
uint8_t prev_bit;
@ -617,6 +628,8 @@ bool MDC1200_process_rx(const uint8_t rx_byte, uint8_t *op, uint8_t *arg, uint16
return false;
}
// **********************************************************
/*
void test(void)
{