Got a brainteaser for you! :)
I am working on trying to figuring out this serial communication between a microcontroller and a PC for several months and cannot seem to do it. 9600,N81 and I get no frame errors with my capture tool.
Hopefully someone out there can see these samples and it will click with them.
Sample 1
337795, IN,0xF0,0x5,0x62,0x0,0x0,0xA2,0xDE,0xF3,0x75,0xF3, Bytes = 9
337862,OUT,0xF0,0x5,0x63,0x0,0x1,0x1,0x2C,0x92,0xF3,0xF0,0xF3, Bytes = 10
338923, IN,0xF0,0x5,0x63,0x0,0x0,0x7E,0x84,0xF3,0x75,0xF3, Bytes = 9
338990,OUT,0xF0,0x5,0x64,0x0,0x1,0x1,0xD,0xC5,0xF3,0xF0,0xF3, Bytes = 10
340051, IN,0xF0,0x5,0x64,0x0,0x0,0x7B,0x8,0xF3,0x75,0xF3, Bytes = 9
340118,OUT,0xF0,0x5,0x65,0x0,0x1,0x1,0xB6,0xD9,0xF3,0xF0,0xF3, Bytes = 10
340499, IN,0xF0,0x0,0x65,0x5,0x3,0x1,0x1,0x0,0xAB,0xD3,0xF3,0x54,0xF3, Bytes = 12
340572,OUT,0xF0,0x5,0x66,0x0,0x1,0x1,0x7B,0xFC,0xF3,0xF0,0x5,0x66,0x3,0x4,0x4,0x1,0x8,0x3,0x2F,0x9E,0xF3,0xF3, Bytes = 21
340665, IN,0xF0,0x5,0x66,0x0,0x0,0xC3,0xBD,0xF3,0xAB,0xF3, Bytes = 9
340731,OUT,0xF0,0x5,0x67,0x0,0x1,0x1,0xC0,0xE0,0xF3,0xF0,0xF3, Bytes = 10
341794, IN,0xF0,0x5,0x67,0x0,0x0,0x1F,0xE7,0xF3,0xAB,0xF3, Bytes = 9
341860,OUT,0xF0,0x5,0x68,0x0,0x1,0x1,0x39,0x52,0xF3,0xF0,0xF3, Bytes = 10
342923, IN,0xF0,0x5,0x68,0x0,0x0,0xD8,0xAD,0xF3,0xAB,0xF3, Bytes = 9
342989,OUT,0xF0,0x5,0x69,0x0,0x1,0x1,0x82,0x4E,0xF3,0xF0,0xF3, Bytes = 10
344052, IN,0xF0,0x5,0x69,0x0,0x0,0x4,0xF7,0xF3,0xAB,0xF3, Bytes = 9
344118,OUT,0xF0,0x5,0x6A,0x0,0x1,0x1,0x4F,0x6B,0xF3,0xF0,0xF3, Bytes = 10
345180, IN,0xF0,0x5,0x6A,0x0,0x0,0x60,0x18,0xF3,0xAB,0xF3, Bytes = 9
345246,OUT,0xF0,0x5,0x6B,0x0,0x1,0x1,0xF4,0x77,0xF3,0xF0,0xF3, Bytes = 10
345627, IN,0xF0,0x0,0x6B,0x5,0x3,0x1,0x1,0x0,0x9,0xEA,0xF3,0x54,0xF3, Bytes = 12
345700,OUT,0xF0,0x5,0x6C,0x0,0x1,0x1,0xD5,0x20,0xF3,0xF0,0x5,0x6C,0x3,0x4,0x4,0x1,0x8,0x3,0x78,0x77,0xF3,0xF3, Bytes = 21
Sample 2
371435, IN,0xF0,0x5,0x8C,0x0,0x0,0x18,0xC7,0xF3,0x1A,0xF3, Bytes = 9
371502,OUT,0xF0,0x5,0x8D,0x0,0x1,0x1,0xE4,0x88,0xF3,0xF0,0xF3, Bytes = 10
372563, IN,0xF0,0x5,0x8D,0x0,0x0,0xC4,0x9D,0xF3,0x1A,0xF3, Bytes = 9
372630,OUT,0xF0,0x5,0x8E,0x0,0x1,0x1,0x29,0xAD,0xF3,0xF0,0xF3, Bytes = 10
373692, IN,0xF0,0x5,0x8E,0x0,0x0,0xA0,0x72,0xF3,0x1A,0xF3, Bytes = 9
373758,OUT,0xF0,0x5,0x8F,0x0,0x1,0x1,0x92,0xB1,0xF3,0xF0,0xF3, Bytes = 10
374820, IN,0xF0,0x5,0x8F,0x0,0x0,0x7C,0x28,0xF3,0x1A,0xF3, Bytes = 9
374887,OUT,0xF0,0x5,0x90,0x0,0x1,0x1,0xCA,0xC0,0xF3,0xF0,0xF3, Bytes = 10
375949, IN,0xF0,0x5,0x90,0x0,0x0,0x2E,0xE7,0xF3,0x1A,0xF3, Bytes = 9
376015,OUT,0xF0,0x5,0x91,0x0,0x1,0x1,0x71,0xDC,0xF3,0xF0,0xF3, Bytes = 10
376396, IN,0xF0,0x0,0x91,0x5,0x3,0x1,0x1,0x0,0xA4,0x3,0xF3,0xFD,0xF3, Bytes = 12
376469,OUT,0xF0,0x5,0x92,0x0,0x1,0x1,0xBC,0xF9,0xF3,0xF0,0x5,0x92,0x3,0x4,0x4,0x1,0x8,0x3,0x8,0x66,0xF3,0xF3, Bytes = 21
376562, IN,0xF0,0x5,0x92,0x0,0x0,0x96,0x52,0xF3,0xA4,0xF3, Bytes = 9
376628,OUT,0xF0,0x5,0x93,0x0,0x1,0x1,0x7,0xE5,0xF3,0xF0,0xF3, Bytes = 10
377692, IN,0xF0,0x5,0x93,0x0,0x0,0x4A,0x8,0xF3,0xA4,0xF3, Bytes = 9
377758,OUT,0xF0,0x5,0x94,0x0,0x1,0x1,0x26,0xB2,0xF3,0xF0,0xF3, Bytes = 10
378820, IN,0xF0,0x5,0x94,0x0,0x0,0x4F,0x84,0xF3,0xA4,0xF3, Bytes = 9
378887,OUT,0xF0,0x5,0x95,0x0,0x1,0x1,0x9D,0xAE,0xF3,0xF0,0xF3, Bytes = 10
379949, IN,0xF0,0x5,0x95,0x0,0x0,0x93,0xDE,0xF3,0xA4,0xF3, Bytes = 9
380015,OUT,0xF0,0x5,0x96,0x0,0x1,0x1,0x50,0x8B,0xF3,0xF0,0xF3, Bytes = 10
381077, IN,0xF0,0x5,0x96,0x0,0x0,0xF7,0x31,0xF3,0xA4,0xF3, Bytes = 9
381144,OUT,0xF0,0x5,0x97,0x0,0x1,0x1,0xEB,0x97,0xF3,0xF0,0xF3, Bytes = 10
381523, IN,0xF0,0x0,0x97,0x5,0x3,0x1,0x1,0x0,0x5E,0x1B,0x5B,0xF3,0xF3, Bytes = 12
I have more, if desired.
Some observations I've been able to see -
- First, the numbers at the begging are aggregate timings in I think nanoseconds. The 33* is 33 seconds.
- Beginning byte 0xF0
- Ending byte 0xF3
- Sequence byte, the third byte of every packet increments by 1
- It seems the destination device (noted as OUT) increments first and the host (noted as IN) follows..
- For the most part OUT packets are 10 bytes and IN packets are 9 bytes.
- There are some times when this is not true and the packet can be 21 bytes..
- Although I do notice a begin byte and end byte next to each other in the string of 21 bytes, the third byte (sequence#) does not increment.
- I am not sure how to understand these longer packets.
- This is a point to point communication, there are no other devices connected between these 2.
- It is very chatty.
During my testing and probing, my test leads slipped between a couple of pins and killed the microcontroller. Thinking it would be a great project (and it is), I am attempting to recreate the functions of the original microcontroller. Which, I pretty much have done with the exception of the communication, figuring out what they are talking about and the checksum. I assume the second to the last byte is the checksum.
Thank you!
