mirror/rtl-sdr-blog
1
0
Fork 0
mirror of https://github.com/rtlsdrblog/rtl-sdr-blog.git synced 2024-12-28 11:58:30 +01:00
Code Issues Actions Packages Projects Releases Wiki Activity

changes for new r828d dongles

Browse Source
This commit is contained in:
krakenrf 2023-05-10 18:09:07 +12:00
parent 48ea060ae2
commit a9780ca32b
2 changed files with 84 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/tuner_r82xx.h
View File

@ -27,7 +27,7 @@
#define R820T_I2C_ADDR 0x34
#define R828D_I2C_ADDR 0x74
#define R828D_XTAL_FREQ 16000000
#define R828D_XTAL_FREQ 28800000 //16000000
#define R82XX_CHECK_ADDR 0x00
#define R82XX_CHECK_VAL 0x69

90
src/tuner_r82xx.c
View File

@ -1097,11 +1097,21 @@ int r82xx_set_bandwidth(struct r82xx_priv *priv, int bw, uint32_t rate)
#undef FILT_HP_BW1
#undef FILT_HP_BW2
// Changes to support new r828d dongle versions
int r82xx_set_freq(struct r82xx_priv *priv, uint32_t freq)
{
int rc = -1;
uint32_t lo_freq = freq + priv->int_freq;
// CARL, automatically upconvert to 28.8 MHz if we tune to HF
uint32_t upconvert_freq;
if (freq < MHZ(28.8))
{
upconvert_freq = freq + MHZ(28.8);
}
uint32_t lo_freq = upconvert_freq + priv->int_freq;
uint8_t air_cable1_in;
uint8_t cable2_in;
rc = r82xx_set_mux(priv, lo_freq);
if (rc < 0)
@ -1111,16 +1121,82 @@ int r82xx_set_freq(struct r82xx_priv *priv, uint32_t freq)
if (rc < 0 || !priv->has_lock)
goto err;
// HF -> Cable_2
// VHF -> Cable_1
// UHF -> Air_in
/* 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. */
air_cable1_in = (freq > MHZ(345)) ? 0x00 : 0x60;
* settings. The original driver used 320 MHz. - Modded to switch at 400 MHz */
int band;
if (freq <= MHZ(28.8))
{
band = 0x10; // HF
}
else if (freq > MHZ(28.8) && freq < MHZ(400))
{
band = 0x20;
}
else
{
band = 0x30;
}
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);
// 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))
{
// Switch in Cable 2
rc = r82xx_write_reg_mask(priv, 0x06, 0x08, 0x08);
}
else
{
// Switch out Cable 2
rc = r82xx_write_reg_mask(priv, 0x06, 0x00, 0x08);
}
if ((priv->cfg->rafael_chip == CHIP_R828D) &&
(air_cable1_in != priv->input)) {
priv->input = air_cable1_in;
rc = r82xx_write_reg_mask(priv, 0x05, air_cable1_in, 0x60);
}
err: