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Updating the C++ task documentation

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This commit is contained in:
Andrei Bechet 2015-06-30 15:50:54 +02:00
parent 4c9a0b9be6
commit 87f8527873
1 changed files with 26 additions and 9 deletions
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35
2015/ppc/README.mkd
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@ -6,15 +6,27 @@ vehicle. The raw data has to be converted to arc-milliseconds
1°2'5" == (1*3600+ 2*60 + 5)*1000 1°2'5" == (1*3600+ 2*60 + 5)*1000
Beware that the system you are running your code on will not support floating point operations. **Beware that the system you are running your code on will not support floating point operations.
Use only unsigned and signed integers! Use only unsigned and signed integers!**
Still the precision of your calculations has to be +-100 milli-arc-seconds Still the precision of your calculations has to be +-100 milli-arc-seconds
Dynamic allocation is not supported on the system.
You will have to complete the *GpsConverter.cpp* (and .h).
## Conversion to Arc-Degree ## Conversion to Arc-Degree
inDegree hex = 180/(2^31-1) * (hex) [°] inDegree hex = 180/(2^31-1) * (hex) [°]
#### HINT 1
Try to use constants as much as possible, isntead of computing stuff on the go.
#### HINT 2
In order to aviod losing decimals first multiply with a large factor and then divide to get the result in ms.
## GPS Datalayout in CAN Message ## GPS Datalayout in CAN Message
Byte7 ST_LAT_NAVI Byte7 ST_LAT_NAVI
@ -38,15 +50,18 @@ Little Endian (Least Significant Byte is at lowest address)
-180° ... +180° -180° ... +180°
### signal type ### Signal type
32 Bit Signed Integer (Byte 0 ... Byte 3) 32 Bit Signed Integer (Byte 0 ... Byte 3)
### Invalid Data ### Invalid Data
Invalid-Value: 80 00 00 00h Invalid-Value: 80 00 00 00h
Signal not available value: 7F FF FF FF Signal not available value: 7F FF FF FF
**Do not forget to check for these values**
## Status Latitude Navigation ## Status Latitude Navigation
ST_LAT_NAVI ST_LAT_NAVI
@ -55,7 +70,7 @@ Signal not available value: 7F FF FF FF
-180° ... +180° -180° ... +180°
### signal type ### Signal type
32 Bit Signed Integer (Byte 4 ... Byte 7) 32 Bit Signed Integer (Byte 4 ... Byte 7)
@ -64,16 +79,18 @@ Signal not available value: 7F FF FF FF
Invalid-Value: 80 00 00 00h Invalid-Value: 80 00 00 00h
Signal not available value: 7F FF FF FF Signal not available value: 7F FF FF FF
## Send the data over to the AC
Use the *IGpsACPusher*.
## Running the tests ## Running the tests
you will need a working ruby installation to execute the tests you will need a working ruby installation to execute the tests
### Install the bake tool
see https://esrlabs.com/gems/doc/bake-toolkit/
### run the tests ### run the tests
execute `rake run` from this directory execute `rake run` from this directory
### Install the bake tool
see https://esrlabs.com/gems/doc/bake-toolkit/