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add notch control, tidy up

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rtlsdrblog 2023-05-11 22:45:45 +12:00
parent 855d3c51c4
commit a72e764bec
1 changed files with 59 additions and 37 deletions
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96
src/tuner_r82xx.c
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@ -33,6 +33,10 @@
#define MHZ(x) ((x)*1000*1000)
#define KHZ(x) ((x)*1000)
#define HF 0x10
#define VHF 0x20
#define UHF 0x30
/*
* Static constants
*/
@ -1102,7 +1106,7 @@ int r82xx_set_freq(struct r82xx_priv *priv, uint32_t freq)
{
int rc = -1;
// CARL, automatically upconvert to 28.8 MHz if we tune to HF
// Automatically upconvert to 28.8 MHz if we tune to HF so we don't need to set any upconvert offset in the SDR software
uint32_t upconvert_freq = freq;
if (freq < MHZ(28.8))
{
@ -1121,6 +1125,21 @@ int r82xx_set_freq(struct r82xx_priv *priv, uint32_t freq)
if (rc < 0 || !priv->has_lock)
goto err;
// Set open_d notches automatically
if (freq <= MHZ(2.2)
|| (freq >= MHZ(85) && freq <= MHZ(112)) // Notch off until 112 because of roll off
|| (freq >= MHZ(172) && freq <= MHZ(242)))
{
rc = r82xx_write_reg_mask(priv, 0x17, 0x00, 0x08); // open_d hi_z (notches off)
}
else
{
rc = r82xx_write_reg_mask(priv, 0x17, 0x08, 0x08); // open_d low_z (notches on)
}
if (rc < 0)
goto err;
// HF -> Cable_2
// VHF -> Cable_1
// UHF -> Air_in
@ -1128,65 +1147,40 @@ int r82xx_set_freq(struct r82xx_priv *priv, uint32_t freq)
/* switch between 'Cable1' and 'Air-In' inputs on sticks with
* R828D tuner. We switch at 345 MHz, because that's where the
* noise-floor has about the same level with identical LNA
* settings. The original driver used 320 MHz. - Modded to switch at 400 MHz */
* settings. The original driver used 320 MHz. - Modded to switch at 300 MHz */
int band;
// Only switch if there is a band change (to avoid excessive register writes when tuning rapidly)
int band = 0x00;
if (freq <= MHZ(28.8))
{
band = 0x10; // HF
band = HF; // HF
}
else if (freq > MHZ(28.8) && freq < MHZ(400))
else if (freq > MHZ(28.8) && freq < MHZ(300)) // VHF Tuner Input
{
band = 0x20;
band = VHF;
}
else
else // UHF Tuner Input
{
band = 0x30;
band = UHF;
}
if ((priv->cfg->rafael_chip == CHIP_R828D) && (band != priv->input))
{
priv->input = band;
if (freq > MHZ(400))
{
//Turn air_in LNA ON
rc = r82xx_write_reg_mask(priv, 0x05, 0x00, 0x20);
}
else
{
// Otherwise turn it off to save power (as it uses a lot of power)
rc = r82xx_write_reg_mask(priv, 0x05, 0x20, 0x20);
}
// Turn LT OFF to save power
rc = r82xx_write_reg_mask(priv, 0x05, 0x80, 0x80);
if (rc < 0)
goto err;
// Turn open_d off
//rc = r82xx_write_reg_mask(priv, 0x17, 0x00, 0x08);
// VHF
// Activate Cable_1 input between 28.8 -> 400 MHz.
if (freq > MHZ(28.8) && freq < MHZ(400))
{
rc = r82xx_write_reg_mask(priv, 0x05, 0x40, 0x40);
// Appears to enhance Cable 1 input by 2dB
rc = r82xx_write_reg_mask(priv, 0x06, 0x04, 0x04);
}
else
{
rc = r82xx_write_reg_mask(priv, 0x05, 0x00, 0x40);
// Appears to enhance Cable 1 input by 2dB (off)
rc = r82xx_write_reg_mask(priv, 0x06, 0x00, 0x04);
}
//HF
if (freq < MHZ(28.8))
if (band == HF) //(freq < MHZ(28.8))
{
// Switch in Cable 2
rc = r82xx_write_reg_mask(priv, 0x06, 0x08, 0x08);
@ -1197,6 +1191,34 @@ int r82xx_set_freq(struct r82xx_priv *priv, uint32_t freq)
rc = r82xx_write_reg_mask(priv, 0x06, 0x00, 0x08);
}
// VHF
// Activate Cable_1 input between 28.8 -> 400 MHz.
if (band == VHF)
{
rc = r82xx_write_reg_mask(priv, 0x05, 0x40, 0x40);
// This register setting appears to enhance Cable 1 input by 2dB
rc = r82xx_write_reg_mask(priv, 0x06, 0x04, 0x04);
}
else
{
rc = r82xx_write_reg_mask(priv, 0x05, 0x00, 0x40);
// Turn off the Cable_1 enhancement (off)
rc = r82xx_write_reg_mask(priv, 0x06, 0x00, 0x04);
}
if (band == UHF)
{
//Turn air_in LNA ON
rc = r82xx_write_reg_mask(priv, 0x05, 0x00, 0x20);
}
else
{
// Otherwise turn it off to save power (as it uses a lot of power)
rc = r82xx_write_reg_mask(priv, 0x05, 0x20, 0x20);
}
if (rc < 0)
goto err;
}
err: