mirror/rtl-sdr-blog
1
0
Fork 0
mirror of https://github.com/rtlsdrblog/rtl-sdr-blog.git synced 2024-11-10 04:37:37 +01:00
Code Issues Actions Packages Projects Releases Wiki Activity

tuner_r82xx: turn off loop-through, remove dead code

Browse Source 
As pointed out by Carl Laufer on the mailing list,
turning the loop-through output off reduces the
current consumption by 10-20mA which in turn reduces
the heat a bit. So far there seem to be no devices
that have anything connected to the loop-through output.

Signed-off-by: Steve Markgraf <steve@steve-m.de>
This commit is contained in:
Steve Markgraf 2018-05-25 00:16:38 +02:00
parent ce9595ef53
commit 5c3073f417
1 changed files with 13 additions and 73 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

86
src/tuner_r82xx.c
View File

@ -770,78 +770,18 @@ static int r82xx_set_tv_standard(struct r82xx_priv *priv,
uint8_t lt_att, flt_ext_widest, polyfil_cur; uint8_t lt_att, flt_ext_widest, polyfil_cur;
int need_calibration; int need_calibration;
if (delsys == SYS_ISDBT) { /* BW < 6 MHz */
if_khz = 4063; if_khz = 3570;
filt_cal_lo = 59000; filt_cal_lo = 56000; /* 52000->56000 */
filt_gain = 0x10; /* +3db, 6mhz on */ filt_gain = 0x10; /* +3db, 6mhz on */
img_r = 0x00; /* image negative */ img_r = 0x00; /* image negative */
filt_q = 0x10; /* r10[4]:low q(1'b1) */ filt_q = 0x10; /* r10[4]:low q(1'b1) */
hp_cor = 0x6a; /* 1.7m disable, +2cap, 1.25mhz */ hp_cor = 0x6b; /* 1.7m disable, +2cap, 1.0mhz */
ext_enable = 0x40; /* r30[6], ext enable; r30[5]:0 ext at lna max */ ext_enable = 0x60; /* r30[6]=1 ext enable; r30[5]:1 ext at lna max-1 */
loop_through = 0x00; /* r5[7], lt on */ loop_through = 0x01; /* r5[7], lt off */
lt_att = 0x00; /* r31[7], lt att enable */ lt_att = 0x00; /* r31[7], lt att enable */
flt_ext_widest = 0x00; /* r15[7]: flt_ext_wide off */ flt_ext_widest = 0x00; /* r15[7]: flt_ext_wide off */
polyfil_cur = 0x60; /* r25[6:5]:min */ polyfil_cur = 0x60; /* r25[6:5]:min */
} else {
if (bw <= 6) {
if_khz = 3570;
filt_cal_lo = 56000; /* 52000->56000 */
filt_gain = 0x10; /* +3db, 6mhz on */
img_r = 0x00; /* image negative */
filt_q = 0x10; /* r10[4]:low q(1'b1) */
hp_cor = 0x6b; /* 1.7m disable, +2cap, 1.0mhz */
ext_enable = 0x60; /* r30[6]=1 ext enable; r30[5]:1 ext at lna max-1 */
loop_through = 0x00; /* r5[7], lt on */
lt_att = 0x00; /* r31[7], lt att enable */
flt_ext_widest = 0x00; /* r15[7]: flt_ext_wide off */
polyfil_cur = 0x60; /* r25[6:5]:min */
} else if (bw == 7) {
#if 0
/*
* There are two 7 MHz tables defined on the original
* driver, but just the second one seems to be visible
* by rtl2832. Keep this one here commented, as it
* might be needed in the future
*/
if_khz = 4070;
filt_cal_lo = 60000;
filt_gain = 0x10; /* +3db, 6mhz on */
img_r = 0x00; /* image negative */
filt_q = 0x10; /* r10[4]:low q(1'b1) */
hp_cor = 0x2b; /* 1.7m disable, +1cap, 1.0mhz */
ext_enable = 0x60; /* r30[6]=1 ext enable; r30[5]:1 ext at lna max-1 */
loop_through = 0x00; /* r5[7], lt on */
lt_att = 0x00; /* r31[7], lt att enable */
flt_ext_widest = 0x00; /* r15[7]: flt_ext_wide off */
polyfil_cur = 0x60; /* r25[6:5]:min */
#endif
/* 7 MHz, second table */
if_khz = 4570;
filt_cal_lo = 63000;
filt_gain = 0x10; /* +3db, 6mhz on */
img_r = 0x00; /* image negative */
filt_q = 0x10; /* r10[4]:low q(1'b1) */
hp_cor = 0x2a; /* 1.7m disable, +1cap, 1.25mhz */
ext_enable = 0x60; /* r30[6]=1 ext enable; r30[5]:1 ext at lna max-1 */
loop_through = 0x00; /* r5[7], lt on */
lt_att = 0x00; /* r31[7], lt att enable */
flt_ext_widest = 0x00; /* r15[7]: flt_ext_wide off */
polyfil_cur = 0x60; /* r25[6:5]:min */
} else {
if_khz = 4570;
filt_cal_lo = 68500;
filt_gain = 0x10; /* +3db, 6mhz on */
img_r = 0x00; /* image negative */
filt_q = 0x10; /* r10[4]:low q(1'b1) */
hp_cor = 0x0b; /* 1.7m disable, +0cap, 1.0mhz */
ext_enable = 0x60; /* r30[6]=1 ext enable; r30[5]:1 ext at lna max-1 */
loop_through = 0x00; /* r5[7], lt on */
lt_att = 0x00; /* r31[7], lt att enable */
flt_ext_widest = 0x00; /* r15[7]: flt_ext_wide off */
polyfil_cur = 0x60; /* r25[6:5]:min */
}
}
/* Initialize the shadow registers */ /* Initialize the shadow registers */
memcpy(priv->regs, r82xx_init_array, sizeof(r82xx_init_array)); memcpy(priv->regs, r82xx_init_array, sizeof(r82xx_init_array));
@ -1196,7 +1136,7 @@ int r82xx_standby(struct r82xx_priv *priv)
rc = r82xx_write_reg(priv, 0x06, 0xb1); rc = r82xx_write_reg(priv, 0x06, 0xb1);
if (rc < 0) if (rc < 0)
return rc; return rc;
rc = r82xx_write_reg(priv, 0x05, 0x03); rc = r82xx_write_reg(priv, 0x05, 0xa0);
if (rc < 0) if (rc < 0)
return rc; return rc;
rc = r82xx_write_reg(priv, 0x07, 0x3a); rc = r82xx_write_reg(priv, 0x07, 0x3a);