Low frequency RFID app [Read stage] (#385)

* App Lfrfid: init * HAL-resources: add external gpios * HAL-pwm: fix frequency calculation * App LFRFID: generic manchester decoder * App LFRFID: em-marine decoder * App iButton: fix dwt timing acquire * App LFRFID: rfid reader * App LFRFID: temporary read keys on read scene * App LFRFID: remove atomic bool init. * App LFRFID: add *.c to build * App LFRFID: unstable HID decoder * App LFRFID: HID-26 reading * HAL OS: disable sleep * App LFRFID: HID-26 reader: remove debug * App LFRFID: static data decoder-analyzer * App LFRFID: very raw Indala decoder * App LFRFID: multiprotocol reader * App LFRFID: more reliable HID decoder * App LFRFID: syntax fix * App LFRFID: simple read scene * Gui: force redraw on screen stream connect * HAL-OS: allow sleep * App LFRFID: notify api, tune view, tune scene * App LFRFID: simple rfid emulator * App LFRFID: more scenes, more reliable EM decoder. * App LFRFID: format fix * App LFRFID: warning fix * Api-hal-resources: add rfid pins, rename external pins * App LFRFID: remove unused emulator * App LFRFID: use new gpio hal api * App accessor: use new ext gpio name * App LFRFID: remove unused emulator * App LFRFID: remove debug gpio * Api-hal-resources: alternate functions init * Api-hal-rfid: new api * Api-hal-ibutton: new api * Api-hal: new headers * App LFRFID: use new api in reader subroutines * App LFRFID: use new api in emulator subroutines * App LFRFID: remove old app * App LFRFID, App iButton: fix memleak * Api-hal-rfid: comments * App LFRFID: pulse joiner helper, it combines pulses of different polarity into one pulse suitable for a timer * App LFRFID: pulse joiner, now can accept only ne pulse * App LFRFID: pulse joiner, fixes * App LFRFID: EM encoder and emulation * App LFRFID: format fixes * App LFRFID: emmarine encoder cleanup * App LFRFID: HID Encoder blank * App LFRFID: Indala Encoder blank
2021-05-04 23:21:16 +10:00
parent dd9bd224be
commit 46bc515c6a
66 changed files with 3278 additions and 514 deletions
--- a/applications/lf-rfid/helpers/encoder-emmarine.cpp
+++ b/applications/lf-rfid/helpers/encoder-emmarine.cpp
@@ -0,0 +1,58 @@
+#include "encoder-emmarine.h"
+#include <furi.h>
+
+void EncoderEM::init(const uint8_t* data, const uint8_t data_size) {
+    furi_check(data_size == 5);
+
+    // header
+    card_data = 0b111111111;
+
+    // data
+    for(uint8_t i = 0; i < 5; i++) {
+        write_nibble(false, data[i]);
+        write_nibble(true, data[i]);
+    }
+
+    // column parity and stop bit
+    uint8_t parity_sum;
+
+    for(uint8_t c = 0; c < 4; c++) {
+        parity_sum = 0;
+        for(uint8_t i = 1; i <= 10; i++) {
+            uint8_t parity_bit = (card_data >> (i * 5 - 1)) & 1;
+            parity_sum += parity_bit;
+        }
+        card_data = (card_data << 1) | ((parity_sum % 2) & 1);
+    }
+
+    // stop bit
+    card_data = (card_data << 1) | 0;
+    card_data_index = 0;
+}
+
+void EncoderEM::write_nibble(bool low_nibble, uint8_t data) {
+    uint8_t parity_sum = 0;
+    uint8_t start = 0;
+    if(!low_nibble) start = 4;
+
+    for(int8_t i = (start + 3); i >= start; i--) {
+        parity_sum += (data >> i) & 1;
+        card_data = (card_data << 1) | ((data >> i) & 1);
+    }
+
+    card_data = (card_data << 1) | ((parity_sum % 2) & 1);
+}
+
+// data transmitted as manchester encoding
+// 0 - high2low
+// 1 - low2high
+void EncoderEM::get_next(bool* polarity, uint16_t* period, uint16_t* pulse) {
+    *period = clocks_per_bit;
+    *pulse = clocks_per_bit / 2;
+    *polarity = (card_data >> (63 - card_data_index)) & 1;
+
+    card_data_index++;
+    if(card_data_index >= 64) {
+        card_data_index = 0;
+    }
+}