Maxim Integrated
1-Wire® library for mbed. Complete 1-Wire library that supports our silicon masters along with a bit-bang master on the MAX32600MBED platform with one common interface for mbed. Slave support has also been included and more slaves will be added as time permits.
Dependents: MAXREFDES131_Qt_Demo MAX32630FTHR_iButton_uSD_Logger MAX32630FTHR_DS18B20_uSD_Logger MAXREFDES130_131_Demo ... more
Superseded by MaximInterface.
Diff: crc.cpp
- Revision:
- 78:0cbbac7f2016
- Child:
- 80:83b0d879cc32
diff -r 529edb329ee0 -r 0cbbac7f2016 crc.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/crc.cpp Mon May 16 15:18:09 2016 -0500
@@ -0,0 +1,30 @@
+#include "crc.h"
+
+uint16_t OneWire::crc::calculateCrc16(uint16_t crc16, uint16_t data)
+{
+ const uint16_t oddparity[] = { 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0 };
+
+ data = (data ^ (crc16 & 0xff)) & 0xff;
+ crc16 >>= 8;
+
+ if (oddparity[data & 0xf] ^ oddparity[data >> 4])
+ {
+ crc16 ^= 0xc001;
+ }
+
+ data <<= 6;
+ crc16 ^= data;
+ data <<= 1;
+ crc16 ^= data;
+
+ return crc16;
+}
+
+uint16_t OneWire::crc::calculateCrc16(const uint8_t * data, size_t dataOffset, size_t dataLen, uint16_t crc)
+{
+ for (size_t i = dataOffset; i < (dataLen + dataOffset); i++)
+ {
+ crc = calculateCrc16(crc, data[i]);
+ }
+ return crc;
+}