- C implementation of the CIC filter for decimation and interpolation.
- Configurable data type
- With or without memory allocation
- Single buffer operation
- CUnit tests
Copy the cic_config.template to you project with the name cic_config.h.
#include cic_filter.h
#define N 4
#define M 1
#define R 5
#define BLOCK_LEN 128
cic_t buffer[BLOCK_LEN * R]
struct cic_filter filter;
if (cic_filter_init(&filter, N, M, R, NULL, true) < 0)
return -1;
size_t rlen;
// Calculate the interpolation. The result is located in buffer with rlen elements.
rlen = cic_filter_interpolate(&filter, buffer, BLOCK_LEN * R, BLOCK_LEN);
// Calculate the decimation. The result is located in buffer with rlen elements.
rlen = cic_filter_decimate(&filter, buffer, rlen);CUnit must be installed on you system. For Debian / Ubuntu apt install libcunit1 can be used.
The unit test can be executed with
make test
./cic_test