Magene Radar Data

gistfile1.txt

Command to enable radar data over BTLE send to char 0xE5CC02
0x57,0x09,0x01

Disable
0x57,0x09,0x00

Then set notify on 0xE5CC02

Data as follows from Radar demo mode

No cars
570900 30 00 00 00 00 00 00 00

1 car
570900 30 01 00 29 00 00 04 00

2 cars
570900 30 05 00 AC 0B 00 44 00

3 cars
570900 30 15 00 2A DB 02 44 04

4 cars
570900 30 55 00 E9 CA BA 44 44

5 cars
570900 30 55 00 68 BA B2 44 44
570900 31 01 00 2E 00 00 04 00

6 cars
570900 30 55 00 26 9A AE 44 44
570900 31 05 00 AC 0B 00 44 00

7 cars
570900 30 55 00 A4 89 A6 44 44
570900 31 15 00 2B EB 02 44 04

8 cars
570900 30 55 00 23 69 A2 44 44
570900 31 55 00 E9 CA BA 44 44

570900 is always the same
byte 4:     - 30 - Radar Targets A
              31 - Radar Targets B, if more than 4 cars
byte 5      - 2 bits per target target 1 bits 0:1, target 2 2:3 etc. values are:
    0 - no threat, 
    1 - vehicle approaches, 
    2 - Vehicle Fast Approach
byte 6      - Threat side not appeared to be used
bytes 7-9   - Target ranges possibly 6 bits per target?
			  
			  // Bit odd this... 
			  
			  // Range target 1 is right 6 bits of first byte.
			  let rangeTarget1 = Double(firstByte & 0x3F)  * 3.125
			  
			  // Range Target 2 is first byte right shifted 6 (left 2 bits) + 4 right bits of second byte left shifted twice
			  let rangeTarget2 = Double((firstByte >> 6) + ((secondByte & 0xF) << 2))  * 3.125
			  
			  // Range Target 3 second byte right shifted 4 (left 4 bits) + right 2 bits of third byte left shifted 4
			  let rangeTarget3 = Double(secondByte >> 4 + (thirdByte & 0x3) << 4 )  * 3.125
			  
			  // Range Target 4 left 6 bits of third byte right shifted 2.
			  let rangeTarget4 = Double(thirdByte >> 2) * 3.125
              
bytes 10-11 - Speed in units of 3.04 m/s 4 bits per target.
			  speed target 1 is right 4 bits of byte 10
			  speed target 2 is left 4 bits of byte 10
			  speed target 1 is right 4 bits of byte 11
			  speed target 2 is left 4 bits of byte 11
	      
     

I created a graph to make it easier to visualise.