# Simple wrapper for DataFrame

Create formatted frame from basic types:
 - uint8_t, int8_t => 1Byte
 - uint16_t, int16_t => 2Bytes
 - uint32_t, int32_t => 4Bytes
 - float => 4Bytes

 Data are stared in Little Endian format.

Structure of data frame:
  - starting byte (0xCC)
  - length of frame: count of bytes in payload. The first 2 bytes is not included to overal length. Maximum length: 254 (0xFE)
  - payload
  - CRC8
 
   

## Basic usage

```c

    void main(){
    uint8_t data[128];

    packet_create(data, 128);

    packet_add_uint8(0xAB);
    packet_add_uint16(65874);
    packet_add_int16(-45874);
    packet_add_uint32(0x12345678);
    packet_add_int32(-0xA2345678);
    
    packet_add_float(0.265);
    packet_add_float(-3.1415);

    int data_length = packet_commit();
    }

```

## CRC8 Computation

- Generator polynome: 0x97 ->  0x197 = x^8 + x^7 + x^4 + x^2 + x^1 +1 
- CRC is implemented as fast computation with prepared CrcTable. Algorithm complexity is O(n)