[FL-2393][FL-2381] iButton, OneWire: move to plain C (#1068)

* iButton: getting started on the worker concept * Hal delay: added global instructions_per_us variable * iButton: one wire slave * iButton: ibutton key setter * iButton: one wire host, use ibutton_hal * iButton\RFID: common pulse decoder concept * iButton: cyfral decoder * iButton: worker thread concept * iButton: metakom decoder * iButton: write key through worker * iButton: worker mode holder * iButton: worker improvements * iButton: Cyfral encoder * iButton: Metakom encoder * lib: pulse protocol helpers * iButton: Metakom decoder * iButton: Cyfral decoder * iButton worker: separate modes * iButton: libs documentation * HAL: iButton gpio modes * iButton worker: rename modes file * iButton worker, hal: move to LL * iButton CLI: worker for reading and emulation commands * iButton HAL: correct init and emulation sequence * iButton cli: moved to plain C * iButton: move to worker, small step to plain C * Libs, one wire: move to plain C * Libs: added forgotten files to compilation * iButton writer: get rid of manual disable/enable irq
2022-03-29 23:01:56 +10:00
parent d15a9500c6
commit bdba15b366
112 changed files with 4444 additions and 3231 deletions
@@ -0,0 +1,16 @@
+#include "maxim_crc.h"
+
+uint8_t maxim_crc8(const uint8_t* data, const uint8_t data_size, const uint8_t crc_init) {
+    uint8_t crc = crc_init;
+
+    for(uint8_t index = 0; index < data_size; ++index) {
+        uint8_t input_byte = data[index];
+        for(uint8_t bit_position = 0; bit_position < 8; ++bit_position) {
+            const uint8_t mix = (crc ^ input_byte) & (uint8_t)(0x01);
+            crc >>= 1;
+            if(mix != 0) crc ^= 0x8C;
+            input_byte >>= 1;
+        }
+    }
+    return crc;
+}