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librtlsdr
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added agc_variant = -2 for rtlsdr_set_tuner_agc_mode() 

Signed-off-by: hayati ayguen <h_ayguen@web.de>
development
hayati ayguen 2019-07-30 23:59:12 +02:00
parent d4e181c798
commit ab50557d89
2 changed files with 30 additions and 11 deletions
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3
include/rtl-sdr.h
View File

@ -308,7 +308,8 @@ RTLSDR_API int rtlsdr_set_tuner_gain_mode(rtlsdr_dev_t *dev, int manual);
* Automatic gain mode must be enabled for the gain setter function to work.
*
* \param dev the device handle given by rtlsdr_open()
* \param agc variant: 0 for automatic LNA/Mixer; fixed VGA
* \param agc variant: 0 for automatic LNA/Mixer and fixed VGA (=default)
* -2 for automatic LNA/Mixer and automatic VGA
* -1 for LNA/Mixer = last value from prev rtlsdr_set_tuner_gain; VGA = auto
* >0: gain := agc_variant for rtlsdr_set_tuner_gain() for LNA/Mixer; VGA = auto
* \return 0 on success

38
src/tuner_r82xx.c
View File

@ -1074,6 +1074,13 @@ int r82xx_set_gain(struct r82xx_priv *priv, int set_manual_gain, int gain,
vga_gain = priv->last_VGA_value | 0x10; /* should activate AGC */
extended_mode = 1;
}
else if ( priv->agc_mode == -2 ) {
/* LNA/Mixer = Auto; VGA = auto */
lna_gain = priv->last_LNA_value;
mixer_gain = priv->last_Mixer_value;
vga_gain = priv->last_VGA_value | 0x10; /* should activate AGC */
extended_mode = 0;
}
else if ( priv->agc_mode > 0 ) {
/* LNA/Mixer = from rtlsdr_set_tuner_gain(tunerAgcMode); VGA = auto */
r82xx_get_gain_index(priv->agc_mode, &lna_gain, &mixer_gain);
@ -1138,16 +1145,27 @@ int r82xx_set_gain(struct r82xx_priv *priv, int set_manual_gain, int gain,
if (rc < 0)
return rc;
/* set fixed VGA gain for now (26.5 dB == -12 dB + 0x0b * 3.5 dB) */
/* rc = r82xx_write_reg_mask(priv, 0x0c, 0x0b, 0x9f); */
/* set VGA gain auto */
rc = r82xx_write_reg_mask(priv, 0x0c, 0x1b, 0x9f);
if (rc < 0)
return rc;
priv->last_AGC_state = new_agc_state;
if ( rtl_vga_control )
*rtl_vga_control = 1;
if ( priv->agc_mode == -2 ) {
/* Set VGA = auto */
rc = r82xx_write_reg_mask(priv, 0x0c, vga_gain, 0x9f);
if (rc < 0)
return rc;
priv->last_VGA_value = vga_gain & 0x0f;
priv->last_AGC_state = new_agc_state;
if ( (vga_gain & 0x10) && rtl_vga_control )
*rtl_vga_control = 1;
} else {
/* set fixed VGA gain for now (26.5 dB == -12 dB + 0x0b * 3.5 dB) */
/* rc = r82xx_write_reg_mask(priv, 0x0c, 0x0b, 0x9f); */
/* set VGA gain auto */
rc = r82xx_write_reg_mask(priv, 0x0c, 0x1b, 0x9f);
if (rc < 0)
return rc;
priv->last_AGC_state = new_agc_state;
if ( rtl_vga_control )
*rtl_vga_control = 0;
}
}
return 0;