Lib Hoymiles: Added required CRC functions

lib/Hoymiles/src/crc.cpp

@@ -0,0 +1,46 @@
+#include "crc.h"
+
+uint8_t crc8(uint8_t buf[], uint8_t len)
+{
+    uint8_t crc = CRC8_INIT;
+    for (uint8_t i = 0; i < len; i++) {
+        crc ^= buf[i];
+        for (uint8_t b = 0; b < 8; b++) {
+            crc = (crc << 1) ^ ((crc & 0x80) ? CRC8_POLY : 0x00);
+        }
+    }
+    return crc;
+}
+
+uint16_t crc16(uint8_t buf[], uint8_t len, uint16_t start)
+{
+    uint16_t crc = start;
+    uint8_t shift = 0;
+
+    for (uint8_t i = 0; i < len; i++) {
+        crc = crc ^ buf[i];
+        for (uint8_t bit = 0; bit < 8; bit++) {
+            shift = (crc & 0x0001);
+            crc = crc >> 1;
+            if (shift != 0)
+                crc = crc ^ 0xA001;
+        }
+    }
+    return crc;
+}
+
+uint16_t crc16nrf24(uint8_t buf[], uint16_t lenBits, uint16_t startBit, uint16_t crcIn)
+{
+    uint16_t crc = crcIn;
+    uint8_t idx, val = buf[(startBit >> 3)];
+
+    for (uint16_t bit = startBit; bit < lenBits; bit++) {
+        idx = bit & 0x07;
+        if (0 == idx)
+            val = buf[(bit >> 3)];
+        crc ^= 0x8000 & (val << (8 + idx));
+        crc = (crc & 0x8000) ? ((crc << 1) ^ CRC16_NRF24_POLYNOM) : (crc << 1);
+    }
+
+    return crc;
+}

lib/Hoymiles/src/crc.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <cstdint>
+
+#define CRC8_INIT 0x00
+#define CRC8_POLY 0x01
+
+#define CRC16_MODBUS_POLYNOM 0xA001
+#define CRC16_NRF24_POLYNOM 0x1021
+
+uint8_t crc8(uint8_t buf[], uint8_t len);
+uint16_t crc16(uint8_t buf[], uint8_t len, uint16_t start = 0xffff);
+uint16_t crc16nrf24(uint8_t buf[], uint16_t lenBits, uint16_t startBit = 0, uint16_t crcIn = 0xffff);