Remi Beges
First class data visualization and communication library with embedded devices. Code is maintained at github.com/Overdrivr/Telemetry
Dependents: telemetry_car_demo telemetry_demo_FRDM-TFC telemetry_example_01 telemetry_indexed_data_demo ... more
Diff: c_api/crc16.c
- Revision:
- 5:cd94bb58e096
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/c_api/crc16.c Wed Mar 09 12:15:13 2016 +0000
@@ -0,0 +1,34 @@
+#include "crc16.h"
+
+uint16_t crc16(uint8_t* data, uint32_t len)
+{
+ uint16_t rem = 0;
+ uint16_t i=0;
+ for(i = 0 ; i < len ; i++)
+ {
+ rem = crc16_recursive(data[i],rem);
+ }
+ return rem;
+ }
+
+uint16_t crc16_recursive(uint8_t byte, uint16_t remainder)
+{
+ uint16_t n = 16;
+
+ remainder = remainder ^ (byte << (n-8));
+ uint16_t j = 0;
+ for(j = 1 ; j < 8 ; j++)
+ {
+ if(remainder & 0x8000)
+ {
+ remainder = (remainder << 1) ^ 0x1021;
+ }
+ else
+ {
+ remainder = remainder << 1;
+ }
+ remainder &= 0xffff;
+ }
+
+ return remainder;
+}