diff options
| author | Christian Vogel <vogelchr@vogel.cx> | 2012-05-17 21:54:24 +0200 |
|---|---|---|
| committer | Steve Markgraf <steve@steve-m.de> | 2012-05-17 21:58:53 +0200 |
| commit | 589e96e8d8e40e84061bca07474787bfd3f505eb (patch) | |
| tree | a97695e11fbf4fbe0c4c70c576e172d4d6789a8e /src | |
| parent | c426e94093ef4b30620f88236077706abe4b6832 (diff) | |
Using a #define for constant 2^22 (not pow())
pow() might require the math library to be linked with
rtl-sdl (e.g. when compiling with clang), even though
it's actually constant.
Signed-off-by: Steve Markgraf <steve@steve-m.de>
Diffstat (limited to 'src')
| -rw-r--r-- | src/librtlsdr.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/src/librtlsdr.c b/src/librtlsdr.c index 6a9539b..da79acb 100644 --- a/src/librtlsdr.c +++ b/src/librtlsdr.c @@ -675,6 +675,9 @@ int rtlsdr_set_tuner_gain_mode(rtlsdr_dev_t *dev, int mode) return r; } +/* two raised to the power of n */ +#define TWO_POW(n) ((double)(1ULL<<(n))) + int rtlsdr_set_sample_rate(rtlsdr_dev_t *dev, uint32_t samp_rate) { uint16_t tmp; @@ -688,10 +691,10 @@ int rtlsdr_set_sample_rate(rtlsdr_dev_t *dev, uint32_t samp_rate) if (samp_rate > MAX_SAMP_RATE) samp_rate = MAX_SAMP_RATE; - rsamp_ratio = (dev->rtl_xtal * pow(2, 22)) / samp_rate; + rsamp_ratio = (dev->rtl_xtal * TWO_POW(22)) / samp_rate; rsamp_ratio &= ~3; - real_rate = (dev->rtl_xtal * pow(2, 22)) / rsamp_ratio; + real_rate = (dev->rtl_xtal * TWO_POW(22)) / rsamp_ratio; if ( ((double)samp_rate) != real_rate ) fprintf(stderr, "Exact sample rate is: %f Hz\n", real_rate); |