add an initial version of rtl_test

This tool allows to check for lost samples (and thus check the USB
connection), as well as benchmark the Elonics E4000 tunable range.
(-t switch)

Signed-off-by: Steve Markgraf <steve@steve-m.de>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/librtlsdr.c b/src/librtlsdr.c
index b6f9163..7721c4a 100644
--- a/src/librtlsdr.c
+++ b/src/librtlsdr.c
@@ -726,6 +726,16 @@ uint32_t rtlsdr_get_sample_rate(rtlsdr_dev_t *dev)
 	return dev->rate;
 }
 
+int rtlsdr_set_testmode(rtlsdr_dev_t *dev, int on)
+{
+	if (!dev)
+		return -1;
+
+	rtlsdr_demod_write_reg(dev, 0, 0x19, on ? 0x23 : 0x25 , 1);
+
+	return 0;
+}
+
 rtlsdr_dongle_t *find_known_device(uint16_t vid, uint16_t pid)
 {
 	unsigned int i;