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tuner_fc0013: fix and improve manual LNA gain

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Signed-off-by: Steve Markgraf <steve@steve-m.de>
This commit is contained in:
Steve Markgraf 2012-09-20 00:47:11 +02:00
parent 15b9e7ef02
commit 143b103061
3 changed files with 65 additions and 40 deletions
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3
include/tuner_fc0013.h
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@ -31,6 +31,7 @@
int fc0013_init(void *dev);
int fc0013_set_params(void *dev, uint32_t freq, uint32_t bandwidth);
int fc0013_set_gain(void *dev, int gain);
int fc0013_set_gain_mode(void *dev, int manual);
int fc0013_set_lna_gain(void *dev, int gain);
#endif

7
src/librtlsdr.c
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@ -151,8 +151,7 @@ int fc0013_set_freq(void *dev, uint32_t freq) {
return fc0013_set_params(dev, freq, 6000000);
}
int fc0013_set_bw(void *dev, int bw) { return 0; }
int _fc0013_set_gain(void *dev, int gain) { return fc0013_set_gain(dev, gain); }
int fc0013_set_gain_mode(void *dev, int manual) { return 0; }
int _fc0013_set_gain(void *dev, int gain) { return fc0013_set_lna_gain(dev, gain); }
int fc2580_init(void *dev) { return fc2580_Initialize(dev); }
int fc2580_exit(void *dev) { return 0; }
@ -757,7 +756,9 @@ int rtlsdr_get_tuner_gains(rtlsdr_dev_t *dev, int *gains)
const int e4k_gains[] = { -10, 15, 40, 65, 90, 115, 140, 165, 190, 215,
240, 290, 340, 420 };
const int fc0012_gains[] = { -99, -40, 71, 179, 192 };
const int fc0013_gains[] = { -63, 71, 191, 197 };
const int fc0013_gains[] = { -99, -73, -65, -63, -60, -58, -54, 58, 61,
63, 65, 67, 68, 70, 71, 179, 181, 182,
184, 186, 188, 191, 197 };
const int fc2580_gains[] = { 0 /* no gain values */ };
const int r820t_gains[] = { 0 /* no gain values */ };
const int unknown_gains[] = { 0 /* no gain values */ };

95
src/tuner_fc0013.c
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@ -432,52 +432,75 @@ exit:
return ret;
}
int fc0013_set_gain(void *dev, int gain)
int fc0013_set_gain_mode(void *dev, int manual)
{
int ret, gainshift = 0, en_in_chg = 0;
int ret = 0;
uint8_t tmp = 0;
ret = fc0013_readreg(dev, 0x14, &tmp);
ret |= fc0013_readreg(dev, 0x0d, &tmp);
if (manual)
tmp |= (1 << 3);
else
tmp &= ~(1 << 3);
ret |= fc0013_writereg(dev, 0x0d, tmp);
/* set a fixed IF-gain for now */
ret |= fc0013_writereg(dev, 0x13, 0x0a);
return ret;
}
int fc0013_lna_gains[] ={
-99, 0x02,
-73, 0x03,
-65, 0x05,
-63, 0x04,
-63, 0x00,
-60, 0x07,
-58, 0x01,
-54, 0x06,
58, 0x0f,
61, 0x0e,
63, 0x0d,
65, 0x0c,
67, 0x0b,
68, 0x0a,
70, 0x09,
71, 0x08,
179, 0x17,
181, 0x16,
182, 0x15,
184, 0x14,
186, 0x13,
188, 0x12,
191, 0x11,
197, 0x10
};
#define GAIN_CNT (sizeof(fc0013_lna_gains) / sizeof(int) / 2)
int fc0013_set_lna_gain(void *dev, int gain)
{
int ret = 0;
unsigned int i;
uint8_t tmp = 0;
ret |= fc0013_readreg(dev, 0x14, &tmp);
/* mask bits off */
tmp &= 0xe0;
switch (gain) {
case -63: /* -6.3 dB */
break;
case 71:
tmp |= 0x08; /* 7.1 dB */
break;
case 191:
gainshift = 1;
tmp |= 0x11; /* 19.1 dB */
break;
case 197:
default:
en_in_chg = 1;
gainshift = 1;
tmp |= 0x10; /* 19.7 dB */
break;
for (i = 0; i < GAIN_CNT; i++) {
if ((fc0013_lna_gains[i*2] >= gain) || (i+1 == GAIN_CNT)) {
tmp |= fc0013_lna_gains[i*2 + 1];
break;
}
}
/* set gain */
ret = fc0013_writereg(dev, 0x14, tmp);
/* set en_in_chg */
ret = fc0013_readreg(dev, 0x0a, &tmp);
if (en_in_chg)
tmp |= 0x20;
else
tmp &= ~0x20;
ret = fc0013_writereg(dev, 0x0a, tmp);
/* set gain shift */
ret = fc0013_readreg(dev, 0x07, &tmp);
tmp &= 0xf0;
tmp |= gainshift ? 0x0a : 0x07;
ret = fc0013_writereg(dev, 0x07, tmp);
ret |= fc0013_writereg(dev, 0x14, tmp);
return ret;
}