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-rw-r--r--include/rtl-sdr.h12
-rw-r--r--include/tuner_r820t.h2
2 files changed, 14 insertions, 0 deletions
diff --git a/include/rtl-sdr.h b/include/rtl-sdr.h
index 2b9fff0..98c9992 100644
--- a/include/rtl-sdr.h
+++ b/include/rtl-sdr.h
@@ -229,6 +229,18 @@ RTLSDR_API int rtlsdr_set_testmode(rtlsdr_dev_t *dev, int on);
*/
RTLSDR_API int rtlsdr_set_agc_mode(rtlsdr_dev_t *dev, int on);
+/*!
+ * Enable or disable the direct sampling mode. When enabled, the IF mode
+ * of the RTL2832 is activated, and rtlsdr_set_center_freq() will control
+ * the IF-frequency of the DDC, which can be used to tune from 0 to 28.8 MHz
+ * (xtal frequency of the RTL2832).
+ *
+ * \param dev the device handle given by rtlsdr_open()
+ * \param direct sampling mode, 1 means enabled, 0 disabled
+ * \return 0 on success
+ */
+RTLSDR_API int rtlsdr_set_direct_sampling(rtlsdr_dev_t *dev, int on);
+
/* streaming functions */
RTLSDR_API int rtlsdr_reset_buffer(rtlsdr_dev_t *dev);
diff --git a/include/tuner_r820t.h b/include/tuner_r820t.h
index 058a9f2..5d15bfe 100644
--- a/include/tuner_r820t.h
+++ b/include/tuner_r820t.h
@@ -5,6 +5,8 @@
#define R820T_CHECK_ADDR 0x00
#define R820T_CHECK_VAL 0x69
+#define R820T_IF_FREQ 3570000
+
//***************************************************************
//* INCLUDES.H
//***************************************************************