1 files changed, 73 insertions, 0 deletions
diff --git a/src/tuners/r820t.rs b/src/tuners/r820t.rs
new file mode 100644
index 0000000..2638917
--- /dev/null
+++ b/src/tuners/r820t.rs
@@ -0,0 +1,73 @@
+use super::{Tuner, TunerInfo};
+use usb::RtlSdrDeviceHandle;
+
+const R82XX_IF_FREQ: u32 = 3570000;
+
+pub struct R820T<'a> {
+    pub device: TunerInfo,
+    pub handle: &'a RtlSdrDeviceHandle,
+}
+
+pub const TUNER_ID: &str = "r820t";
+
+pub const TUNER_INFO: TunerInfo = TunerInfo {
+    id: TUNER_ID,
+    name: "Rafael Micro R820T",
+    i2c_addr: 0x34,
+    check_addr: 0x00,
+    check_val: 0x69,
+};
+
+impl<'a> R820T<'a> {
+    pub fn new(handle: &'a RtlSdrDeviceHandle) -> R820T<'a> {
+        R820T {
+            device: TUNER_INFO,
+            handle: handle,
+        }
+    }
+}
+
+impl<'a> Drop for R820T<'a> {
+    fn drop(&mut self) {
+        self.exit();
+    }
+}
+
+impl<'a> Tuner for R820T<'a> {
+    fn init(&self) {
+        // disable Zero-IF mode
+        self.handle.demod_write_reg(1, 0xb1, 0x1a, 1);
+
+        // only enable In-phase ADC input
+        self.handle.demod_write_reg(0, 0x08, 0x4d, 1);
+
+        // the R82XX use 3.57 MHz IF for the DVB-T 6 MHz mode, and
+        // 4.57 MHz for the 8 MHz mode
+        self.handle.set_if_freq(R82XX_IF_FREQ);
+
+        // enable spectrum inversion
+        self.handle.demod_write_reg(1, 0x15, 0x01, 1);
+    }
+
+    fn exit(&self) {}
+
+    fn set_freq(&self, _freq: u32) {
+        unimplemented!()
+    }
+
+    fn set_bw(&self, _bw: u32) {
+        unimplemented!()
+    }
+
+    fn set_gain(&self, _gain: u32) {
+        unimplemented!()
+    }
+
+    fn set_if_gain(&self, _if_gain: u32) {
+        unimplemented!()
+    }
+
+    fn set_gain_mode(&self, _mode: bool) {
+        unimplemented!()
+    }
+}