Test all canutil functions and document in README.

1 files changed, 24 insertions, 4 deletions

diff --git a/README.mkd b/README.mkd
index 8f6ac5f1..b96d587b 100644
--- a/README.mkd
+++ b/README.mkd
@@ -3,26 +3,46 @@ CAN Message Utilities for C
 
 ## Bitfield Manipulation
 
+    uint8_t data[4] = {0x12, 0x34, 0x56, 0x78};
+    uint8_t result = getByte(data, sizeof(data), 0);
+    uint8_t result = getNibble(data, sizeof(data), 0);
+    fail_unless(copyBitsRightAligned(data, 4, 4, 12, result, 4));
+
+## 8 Byte Bitfield Manipulation
+
+TODO setting bit fields is just copying
+TODO bring back old uint64_t implementation of getBitField if it's faster /
+    simpler
+
 ## CAN Signal Encoding
 
+The library supports encoding floating point CAN signals as well as booleans
+into a uint64_t payload.
+
+    uint64_t payload = bitfield_encode_float(1, 1, 3, 1, 0)
+    // payload == 0x1000000000000000
+
+    payload = bitfield_encode_bool(true, 1, 3);
+    // payload == 0x1000000000000000
+
 ## CAN Signal Decoding
 
 The library supports parsing floating point CAN signals as well as booleans.
 
     uint64_t payload = 0xeb00000000000000;
-    float result = bitfield_parse_float(payload,
+    float float_result = bitfield_parse_float(payload,
             2, // starting bit
             4, // width of the signal's field
             1001.0, // transformation factor for the signal value
             -30000.0); // transformation offset for the signal value
-    // result == -19990.0
+    // float_result == -19990.0
 
-    bool result = bitfield_parse_bool(payload,
+    bool bool_result = bitfield_parse_bool(payload,
             0, // starting bit
             1, // width of the signal's field
             1.0, // transformation factor for the signal value
             0); // transformation offset for the signal value
-    // result == true
+    // bool_result == true
 
 ## Testing