flipperzero-firmware/lib/ibutton/protocols/misc/protocol_metakom.c
Georgii Surkov 0917494a80
[FL-3168] Add one_wire lib to f18, separate ibutton (#2509)
* Separate ibutton to its own module, add one_wire to f18
* Move onewire cli to a separate app

Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>
2023-03-21 01:23:17 +09:00

329 lines
9.9 KiB
C

#include <furi.h>
#include <furi_hal.h>
#include "protocol_metakom.h"
#define METAKOM_DATA_SIZE sizeof(uint32_t)
#define METAKOM_PERIOD (125 * furi_hal_cortex_instructions_per_microsecond())
#define METAKOM_0_LOW (METAKOM_PERIOD * 0.33f)
#define METAKOM_0_HI (METAKOM_PERIOD * 0.66f)
#define METAKOM_1_LOW (METAKOM_PERIOD * 0.66f)
#define METAKOM_1_HI (METAKOM_PERIOD * 0.33f)
#define METAKOM_PERIOD_SAMPLE_COUNT 10
typedef enum {
METAKOM_WAIT_PERIOD_SYNC,
METAKOM_WAIT_START_BIT,
METAKOM_WAIT_START_WORD,
METAKOM_READ_WORD,
METAKOM_READ_STOP_WORD,
} MetakomState;
typedef enum {
METAKOM_BIT_WAIT_FRONT_HIGH,
METAKOM_BIT_WAIT_FRONT_LOW,
} MetakomBitState;
typedef struct {
// high + low period time
uint32_t period_time;
uint32_t low_time_storage;
uint8_t period_sample_index;
uint32_t period_sample_data[METAKOM_PERIOD_SAMPLE_COUNT];
uint8_t tmp_data;
uint8_t tmp_counter;
uint8_t key_data_index;
MetakomBitState bit_state;
MetakomState state;
} ProtocolMetakomDecoder;
typedef struct {
uint32_t index;
} ProtocolMetakomEncoder;
typedef struct {
uint32_t data;
ProtocolMetakomDecoder decoder;
ProtocolMetakomEncoder encoder;
} ProtocolMetakom;
static ProtocolMetakom* protocol_metakom_alloc(void) {
ProtocolMetakom* proto = malloc(sizeof(ProtocolMetakom));
return (void*)proto;
}
static void protocol_metakom_free(ProtocolMetakom* proto) {
free(proto);
}
static uint8_t* protocol_metakom_get_data(ProtocolMetakom* proto) {
return (uint8_t*)&proto->data;
}
static void protocol_metakom_decoder_start(ProtocolMetakom* proto) {
ProtocolMetakomDecoder* metakom = &proto->decoder;
metakom->period_sample_index = 0;
metakom->period_time = 0;
metakom->tmp_counter = 0;
metakom->tmp_data = 0;
for(uint8_t i = 0; i < METAKOM_PERIOD_SAMPLE_COUNT; i++) {
metakom->period_sample_data[i] = 0;
};
metakom->state = METAKOM_WAIT_PERIOD_SYNC;
metakom->bit_state = METAKOM_BIT_WAIT_FRONT_LOW;
metakom->key_data_index = 0;
metakom->low_time_storage = 0;
proto->data = 0;
}
static bool metakom_parity_check(uint8_t data) {
uint8_t ones_count = 0;
bool result;
for(uint8_t i = 0; i < 8; i++) {
if((data >> i) & 0b00000001) {
ones_count++;
}
}
result = (ones_count % 2 == 0);
return result;
}
static bool metakom_process_bit(
ProtocolMetakomDecoder* metakom,
bool polarity,
uint32_t time,
uint32_t* high_time,
uint32_t* low_time) {
bool result = false;
switch(metakom->bit_state) {
case METAKOM_BIT_WAIT_FRONT_LOW:
if(polarity == false) {
*low_time = metakom->low_time_storage;
*high_time = time;
result = true;
metakom->bit_state = METAKOM_BIT_WAIT_FRONT_HIGH;
}
break;
case METAKOM_BIT_WAIT_FRONT_HIGH:
if(polarity == true) {
metakom->low_time_storage = time;
metakom->bit_state = METAKOM_BIT_WAIT_FRONT_LOW;
}
break;
}
return result;
}
static bool protocol_metakom_decoder_feed(ProtocolMetakom* proto, bool level, uint32_t duration) {
ProtocolMetakomDecoder* metakom = &proto->decoder;
bool ready = false;
uint32_t high_time = 0;
uint32_t low_time = 0;
switch(metakom->state) {
case METAKOM_WAIT_PERIOD_SYNC:
if(metakom_process_bit(metakom, level, duration, &high_time, &low_time)) {
metakom->period_sample_data[metakom->period_sample_index] = high_time + low_time;
metakom->period_sample_index++;
if(metakom->period_sample_index == METAKOM_PERIOD_SAMPLE_COUNT) {
for(uint8_t i = 0; i < METAKOM_PERIOD_SAMPLE_COUNT; i++) {
metakom->period_time += metakom->period_sample_data[i];
};
metakom->period_time /= METAKOM_PERIOD_SAMPLE_COUNT;
metakom->state = METAKOM_WAIT_START_BIT;
}
}
break;
case METAKOM_WAIT_START_BIT:
if(metakom_process_bit(metakom, level, duration, &high_time, &low_time)) {
metakom->tmp_counter++;
if(high_time > metakom->period_time) {
metakom->tmp_counter = 0;
metakom->state = METAKOM_WAIT_START_WORD;
}
if(metakom->tmp_counter > 40) {
protocol_metakom_decoder_start(proto);
}
}
break;
case METAKOM_WAIT_START_WORD:
if(metakom_process_bit(metakom, level, duration, &high_time, &low_time)) {
if(low_time < (metakom->period_time / 2)) {
metakom->tmp_data = (metakom->tmp_data << 1) | 0b0;
} else {
metakom->tmp_data = (metakom->tmp_data << 1) | 0b1;
}
metakom->tmp_counter++;
if(metakom->tmp_counter == 3) {
if(metakom->tmp_data == 0b010) {
metakom->tmp_counter = 0;
metakom->tmp_data = 0;
metakom->state = METAKOM_READ_WORD;
} else {
protocol_metakom_decoder_start(proto);
}
}
}
break;
case METAKOM_READ_WORD:
if(metakom_process_bit(metakom, level, duration, &high_time, &low_time)) {
if(low_time < (metakom->period_time / 2)) {
metakom->tmp_data = (metakom->tmp_data << 1) | 0b0;
} else {
metakom->tmp_data = (metakom->tmp_data << 1) | 0b1;
}
metakom->tmp_counter++;
if(metakom->tmp_counter == 8) {
if(metakom_parity_check(metakom->tmp_data)) {
proto->data = (proto->data << 8) | metakom->tmp_data;
metakom->key_data_index++;
metakom->tmp_data = 0;
metakom->tmp_counter = 0;
if(metakom->key_data_index == 4) {
// check for stop bit
if(high_time > metakom->period_time) {
metakom->state = METAKOM_READ_STOP_WORD;
} else {
protocol_metakom_decoder_start(proto);
}
}
} else {
protocol_metakom_decoder_start(proto);
}
}
}
break;
case METAKOM_READ_STOP_WORD:
if(metakom_process_bit(metakom, level, duration, &high_time, &low_time)) {
if(low_time < (metakom->period_time / 2)) {
metakom->tmp_data = (metakom->tmp_data << 1) | 0b0;
} else {
metakom->tmp_data = (metakom->tmp_data << 1) | 0b1;
}
metakom->tmp_counter++;
if(metakom->tmp_counter == 3) {
if(metakom->tmp_data == 0b010) {
ready = true;
} else {
protocol_metakom_decoder_start(proto);
}
}
}
break;
}
return ready;
}
static bool protocol_metakom_encoder_start(ProtocolMetakom* proto) {
proto->encoder.index = 0;
return true;
}
static LevelDuration protocol_metakom_encoder_yield(ProtocolMetakom* proto) {
LevelDuration result;
if(proto->encoder.index == 0) {
// sync bit
result = level_duration_make(false, METAKOM_PERIOD);
} else if(proto->encoder.index <= 6) {
// start word (0b010)
switch(proto->encoder.index) {
case 1:
result = level_duration_make(true, METAKOM_0_LOW); //-V1037
break;
case 2:
result = level_duration_make(false, METAKOM_0_HI); //-V1037
break;
case 3:
result = level_duration_make(true, METAKOM_1_LOW);
break;
case 4:
result = level_duration_make(false, METAKOM_1_HI);
break;
case 5:
result = level_duration_make(true, METAKOM_0_LOW);
break;
case 6:
result = level_duration_make(false, METAKOM_0_HI);
break;
}
} else {
// data
uint8_t data_start_index = proto->encoder.index - 7;
bool clock_polarity = (data_start_index) % 2;
uint8_t bit_index = (data_start_index) / 2;
bool bit_value = (proto->data >> (32 - 1 - bit_index)) & 1;
if(!clock_polarity) {
if(bit_value) {
result = level_duration_make(true, METAKOM_1_LOW);
} else {
result = level_duration_make(true, METAKOM_0_LOW);
}
} else {
if(bit_value) {
result = level_duration_make(false, METAKOM_1_HI);
} else {
result = level_duration_make(false, METAKOM_0_HI);
}
}
}
proto->encoder.index++;
if(proto->encoder.index >= (1 + 3 * 2 + 32 * 2)) {
proto->encoder.index = 0;
}
return result;
}
static void protocol_metakom_render_brief_data(ProtocolMetakom* proto, FuriString* result) {
for(size_t i = 0; i < METAKOM_DATA_SIZE; ++i) {
furi_string_cat_printf(result, "%02X ", ((uint8_t*)&proto->data)[i]);
}
}
const ProtocolBase ibutton_protocol_misc_metakom = {
.name = "Metakom",
.manufacturer = "Metakom",
.data_size = METAKOM_DATA_SIZE,
.alloc = (ProtocolAlloc)protocol_metakom_alloc,
.free = (ProtocolFree)protocol_metakom_free,
.get_data = (ProtocolGetData)protocol_metakom_get_data,
.decoder =
{
.start = (ProtocolDecoderStart)protocol_metakom_decoder_start,
.feed = (ProtocolDecoderFeed)protocol_metakom_decoder_feed,
},
.encoder =
{
.start = (ProtocolEncoderStart)protocol_metakom_encoder_start,
.yield = (ProtocolEncoderYield)protocol_metakom_encoder_yield,
},
.render_brief_data = (ProtocolRenderData)protocol_metakom_render_brief_data,
};