diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/lib.rs | 46 |
1 files changed, 10 insertions, 36 deletions
@@ -28,17 +28,18 @@ const KNOWN_DEVICES: [(u16, u16, &str); 2] = [ (0x0bda, 0x2838, "Generic RTL2832U OEM") ]; -const FIR_LENGTH: usize = 16; -const FIR_DEFAULT: [i16; FIR_LENGTH] = [ - -54, -36, -41, -40, -32, -14, 14, 53, // 8 bit signed - 101, 156, 215, 273, 327, 372, 404, 421 // 12 bit signed +const FIR_LENGTH: usize = 20; +const FIR_DEFAULT: [u8; FIR_LENGTH] = [ + 0xca, 0xdc, 0xd7, 0xd8, 0xe0, 0xf2, 0x0e, 0x35, 0x06, 0x50, + 0x9c, 0x0d, 0x71, 0x11, 0x14, 0x71, 0x74, 0x19, 0x41, 0xa5, ]; + pub struct RtlSdr<'a> { ctx: &'a libusb::Context, dev: Option<libusb::DeviceHandle<'a>>, iface_id: u8, - fir: [i16; FIR_LENGTH] + fir: [u8; FIR_LENGTH] } impl<'a> RtlSdr<'a> { @@ -99,36 +100,6 @@ impl<'a> RtlSdr<'a> { self.demod_read_reg(handle, 0x0a, 0x01, 1) } - fn set_fir(&self, handle: &libusb::DeviceHandle) { - let fir: [i16; 20]; - - /* format: int8_t[8] */ - for i in 0..8 { - let val = FIR_DEFAULT[i]; - if val < -128 || val > 127 { - return; - } - fir[i] = val; - } - - /* format: int12_t[8] */ - for idx in 0..4 { - let i = idx * 2; - let val0 = FIR_DEFAULT[8+i]; - let val1 = FIR_DEFAULT[8+i+1]; - if val0 < -2048 || val0 > 2047 || val1 < -2048 || val1 > 2047 { - return; - } - fir[8+i*3/2] = val0 >> 4; - fir[8+i*3/2+1] = (val0 << 4) | ((val1 >> 8) & 0x0f); - fir[8+i*3/2+2] = val1; - } - - for i in 0..20 { - self.demod_write_reg(handle, 1, 0x1c + i, fir[i], 1); - } - } - fn init_baseband(&self, handle: &libusb::DeviceHandle) { // init USB self.write_reg(&handle, BLOCK_USBB, ADDR_USB_SYSCTL, 0x09, 1); @@ -152,7 +123,10 @@ impl<'a> RtlSdr<'a> { self.demod_write_reg(&handle, 1, 0x16 + i, 0x00, 1); } - self.set_fir(&handle); + // set the FIR coefficients + for i in 0..FIR_LENGTH { + self.demod_write_reg(&handle, 1, (0x1c + i) as u16, FIR_DEFAULT[i].into(), 1); + } // enable SDR mode, disable DAGC (bit 5) self.demod_write_reg(&handle, 0, 0x19, 0x05, 1); |