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/* Copyright 2023 OneOfEleven
* https : //github.com/DualTachyon
*
* Licensed under the Apache License , Version 2.0 ( the " License " ) ;
* you may not use this file except in compliance with the License .
* You may obtain a copy of the License at
*
* http : //www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing , software
* distributed under the License is distributed on an " AS IS " BASIS ,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND , either express or implied .
* See the License for the specific language governing permissions and
* limitations under the License .
*/
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// code to 'try' and reduce the AM demodulator saturation problem
//
// that is until someone works out how to properly configure the BK chip !
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# include <string.h>
# include "am_fix.h"
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# include "app/main.h"
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# include "board.h"
# include "driver/bk4819.h"
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# include "external/printf/printf.h"
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# include "frequencies.h"
# include "functions.h"
# include "misc.h"
# include "ui/rssi.h"
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// original QS front end register settings
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const uint8_t orig_lna_short = 3 ; // 0dB
const uint8_t orig_lna = 2 ; // -14dB
const uint8_t orig_mixer = 3 ; // 0dB
const uint8_t orig_pga = 6 ; // -3dB
# ifdef ENABLE_AM_FIX
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typedef struct
{
# if 1
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// bitfields take up less flash bytes
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uint8_t lna_short : 2 ; // 0 ~ 3
uint8_t lna : 3 ; // 0 ~ 7
uint8_t mixer : 2 ; // 0 ~ 3
uint8_t pga : 3 ; // 0 ~ 7
# else
uint8_t lna_short ; // 0 ~ 3
uint8_t lna ; // 0 ~ 7
uint8_t mixer ; // 0 ~ 3
uint8_t pga ; // 0 ~ 7
# endif
} t_am_fix_gain_table ;
//} __attribute__((packed)) t_am_fix_gain_table;
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// REG_10 AGC gain table
//
// <15:10> ???
//
// <9:8> = LNA Gain Short
// 3 = 0dB < original value
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// 2 = -24dB // was -11
// 1 = -30dB // was -16
// 0 = -33dB // was -19
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//
// <7:5> = LNA Gain
// 7 = 0dB
// 6 = -2dB
// 5 = -4dB
// 4 = -6dB
// 3 = -9dB
// 2 = -14dB < original value
// 1 = -19dB
// 0 = -24dB
//
// <4:3> = MIXER Gain
// 3 = 0dB < original value
// 2 = -3dB
// 1 = -6dB
// 0 = -8dB
//
// <2:0> = PGA Gain
// 7 = 0dB
// 6 = -3dB < original value
// 5 = -6dB
// 4 = -9dB
// 3 = -15dB
// 2 = -21dB
// 1 = -27dB
// 0 = -33dB
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// front end register dB values
//
// these values need to be accurate for the code to properly/reliably switch
// between table entries when adjusting the front end registers.
//
// these 4 tables need a measuring/calibration update
//
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// QUESTION: why do I have to surround the negative numbers in brackets ??? .. if I don't then the table contains wrong numbers
//
// static const int16_t lna_short_dB[] = { -19, -16, -11, 0}; // was (but wrong)
static const int16_t lna_short_dB [ ] = { ( - 33 ) , ( - 30 ) , ( - 24 ) , 0 } ; // corrected'ish
static const int16_t lna_dB [ ] = { ( - 24 ) , ( - 19 ) , ( - 14 ) , ( - 9 ) , ( - 6 ) , ( - 4 ) , ( - 2 ) , 0 } ;
static const int16_t mixer_dB [ ] = { ( - 8 ) , ( - 6 ) , ( - 3 ) , 0 } ;
static const int16_t pga_dB [ ] = { ( - 33 ) , ( - 27 ) , ( - 21 ) , ( - 15 ) , ( - 9 ) , ( - 6 ) , ( - 3 ) , 0 } ;
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// lookup table is hugely easier than writing code to do the same
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//
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static const t_am_fix_gain_table am_fix_gain_table [ ] =
{
{ . lna_short = 3 , . lna = 2 , . mixer = 3 , . pga = 6 } , // 0 0dB -14dB 0dB -3dB .. -17dB original
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# ifdef ENABLE_AM_FIX_TEST1
// test table that lets me manually set the lna-short register
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// to measure it's actual dB change using an RF signal generator
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{ 0 , 2 , 3 , 6 } , // 1 .. -33dB -14dB 0dB -3dB .. -50dB
{ 1 , 2 , 3 , 6 } , // 2 .. -30dB -14dB 0dB -3dB .. -47dB
{ 2 , 2 , 3 , 6 } , // 3 .. -24dB -14dB 0dB -3dB .. -41dB
{ 3 , 2 , 3 , 6 } // 4 .. 0dB -14dB 0dB -3dB .. -17dB
} ;
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const unsigned int original_index = 1 ;
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# elif 0
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// in this table the 'lna-short' register I leave unchanged
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{ 3 , 0 , 0 , 0 } , // 1 .. 0dB -24dB -8dB -33dB .. -65dB
{ 3 , 0 , 1 , 0 } , // 2 .. 0dB -24dB -6dB -33dB .. -63dB
{ 3 , 0 , 2 , 0 } , // 3 .. 0dB -24dB -3dB -33dB .. -60dB
{ 3 , 0 , 0 , 1 } , // 4 .. 0dB -24dB -8dB -27dB .. -59dB
{ 3 , 1 , 1 , 0 } , // 5 .. 0dB -19dB -6dB -33dB .. -58dB
{ 3 , 0 , 1 , 1 } , // 6 .. 0dB -24dB -6dB -27dB .. -57dB
{ 3 , 1 , 2 , 0 } , // 7 .. 0dB -19dB -3dB -33dB .. -55dB
{ 3 , 1 , 0 , 1 } , // 8 .. 0dB -19dB -8dB -27dB .. -54dB
{ 3 , 0 , 0 , 2 } , // 9 .. 0dB -24dB -8dB -21dB .. -53dB
{ 3 , 1 , 1 , 1 } , // 10 .. 0dB -19dB -6dB -27dB .. -52dB
{ 3 , 0 , 1 , 2 } , // 11 .. 0dB -24dB -6dB -21dB .. -51dB
{ 3 , 2 , 2 , 0 } , // 12 .. 0dB -14dB -3dB -33dB .. -50dB
{ 3 , 2 , 0 , 1 } , // 13 .. 0dB -14dB -8dB -27dB .. -49dB
{ 3 , 0 , 2 , 2 } , // 14 .. 0dB -24dB -3dB -21dB .. -48dB
{ 3 , 2 , 3 , 0 } , // 15 .. 0dB -14dB 0dB -33dB .. -47dB
{ 3 , 1 , 3 , 1 } , // 16 .. 0dB -19dB 0dB -27dB .. -46dB
{ 3 , 0 , 3 , 2 } , // 17 .. 0dB -24dB 0dB -21dB .. -45dB
{ 3 , 3 , 0 , 1 } , // 18 .. 0dB -9dB -8dB -27dB .. -44dB
{ 3 , 1 , 2 , 2 } , // 19 .. 0dB -19dB -3dB -21dB .. -43dB
{ 3 , 0 , 2 , 3 } , // 20 .. 0dB -24dB -3dB -15dB .. -42dB
{ 3 , 0 , 0 , 4 } , // 21 .. 0dB -24dB -8dB -9dB .. -41dB
{ 3 , 1 , 1 , 3 } , // 22 .. 0dB -19dB -6dB -15dB .. -40dB
{ 3 , 0 , 1 , 4 } , // 23 .. 0dB -24dB -6dB -9dB .. -39dB
{ 3 , 0 , 0 , 5 } , // 24 .. 0dB -24dB -8dB -6dB .. -38dB
{ 3 , 1 , 2 , 3 } , // 25 .. 0dB -19dB -3dB -15dB .. -37dB
{ 3 , 0 , 2 , 4 } , // 26 .. 0dB -24dB -3dB -9dB .. -36dB
{ 3 , 4 , 0 , 2 } , // 27 .. 0dB -6dB -8dB -21dB .. -35dB
{ 3 , 1 , 1 , 4 } , // 28 .. 0dB -19dB -6dB -9dB .. -34dB
{ 3 , 1 , 0 , 5 } , // 29 .. 0dB -19dB -8dB -6dB .. -33dB
{ 3 , 3 , 0 , 3 } , // 30 .. 0dB -9dB -8dB -15dB .. -32dB
{ 3 , 5 , 1 , 2 } , // 31 .. 0dB -4dB -6dB -21dB .. -31dB
{ 3 , 1 , 0 , 6 } , // 32 .. 0dB -19dB -8dB -3dB .. -30dB
{ 3 , 2 , 3 , 3 } , // 33 .. 0dB -14dB 0dB -15dB .. -29dB
{ 3 , 1 , 1 , 6 } , // 34 .. 0dB -19dB -6dB -3dB .. -28dB
{ 3 , 4 , 1 , 3 } , // 35 .. 0dB -6dB -6dB -15dB .. -27dB
{ 3 , 2 , 2 , 4 } , // 36 .. 0dB -14dB -3dB -9dB .. -26dB
{ 3 , 1 , 2 , 6 } , // 37 .. 0dB -19dB -3dB -3dB .. -25dB
{ 3 , 3 , 1 , 4 } , // 38 .. 0dB -9dB -6dB -9dB .. -24dB
{ 3 , 2 , 1 , 6 } , // 39 .. 0dB -14dB -6dB -3dB .. -23dB
{ 3 , 5 , 2 , 3 } , // 40 .. 0dB -4dB -3dB -15dB .. -22dB
{ 3 , 4 , 1 , 4 } , // 41 .. 0dB -6dB -6dB -9dB .. -21dB
{ 3 , 4 , 0 , 5 } , // 42 .. 0dB -6dB -8dB -6dB .. -20dB
{ 3 , 5 , 1 , 4 } , // 43 .. 0dB -4dB -6dB -9dB .. -19dB
{ 3 , 3 , 3 , 4 } , // 44 .. 0dB -9dB 0dB -9dB .. -18dB
{ 3 , 2 , 3 , 6 } , // 45 .. 0dB -14dB 0dB -3dB .. -17dB original
{ 3 , 5 , 1 , 5 } , // 46 .. 0dB -4dB -6dB -6dB .. -16dB
{ 3 , 3 , 1 , 7 } , // 47 .. 0dB -9dB -6dB 0dB .. -15dB
{ 3 , 2 , 3 , 7 } , // 48 .. 0dB -14dB 0dB 0dB .. -14dB
{ 3 , 5 , 1 , 6 } , // 49 .. 0dB -4dB -6dB -3dB .. -13dB
{ 3 , 4 , 2 , 6 } , // 50 .. 0dB -6dB -3dB -3dB .. -12dB
{ 3 , 5 , 2 , 6 } , // 51 .. 0dB -4dB -3dB -3dB .. -10dB
{ 3 , 4 , 3 , 6 } , // 52 .. 0dB -6dB 0dB -3dB .. -9dB
{ 3 , 5 , 2 , 7 } , // 53 .. 0dB -4dB -3dB 0dB .. -7dB
{ 3 , 4 , 3 , 7 } , // 54 .. 0dB -6dB 0dB 0dB .. -6dB
{ 3 , 5 , 3 , 7 } // 55 .. 0dB -4dB 0dB 0dB .. -4dB
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} ;
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const unsigned int original_index = 45 ;
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# else
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// in this table I include adjusting the 'lna-short' register ~
// more gain adjustment range from doing so
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{ 0 , 0 , 0 , 0 } , // 1 .. -33dB -24dB -8dB -33dB .. -98dB
{ 0 , 0 , 1 , 0 } , // 2 .. -33dB -24dB -6dB -33dB .. -96dB
{ 1 , 0 , 0 , 0 } , // 3 .. -30dB -24dB -8dB -33dB .. -95dB
{ 0 , 1 , 0 , 0 } , // 4 .. -33dB -19dB -8dB -33dB .. -93dB
{ 0 , 0 , 0 , 1 } , // 5 .. -33dB -24dB -8dB -27dB .. -92dB
{ 0 , 1 , 1 , 0 } , // 6 .. -33dB -19dB -6dB -33dB .. -91dB
{ 0 , 0 , 1 , 1 } , // 7 .. -33dB -24dB -6dB -27dB .. -90dB
{ 1 , 0 , 0 , 1 } , // 8 .. -30dB -24dB -8dB -27dB .. -89dB
{ 0 , 1 , 2 , 0 } , // 9 .. -33dB -19dB -3dB -33dB .. -88dB
{ 1 , 0 , 3 , 0 } , // 10 .. -30dB -24dB 0dB -33dB .. -87dB
{ 0 , 0 , 0 , 2 } , // 11 .. -33dB -24dB -8dB -21dB .. -86dB
{ 1 , 1 , 2 , 0 } , // 12 .. -30dB -19dB -3dB -33dB .. -85dB
{ 0 , 0 , 3 , 1 } , // 13 .. -33dB -24dB 0dB -27dB .. -84dB
{ 0 , 3 , 0 , 0 } , // 14 .. -33dB -9dB -8dB -33dB .. -83dB
{ 1 , 1 , 3 , 0 } , // 15 .. -30dB -19dB 0dB -33dB .. -82dB
{ 1 , 0 , 3 , 1 } , // 16 .. -30dB -24dB 0dB -27dB .. -81dB
{ 0 , 2 , 3 , 0 } , // 17 .. -33dB -14dB 0dB -33dB .. -80dB
{ 1 , 2 , 0 , 1 } , // 18 .. -30dB -14dB -8dB -27dB .. -79dB
{ 0 , 3 , 2 , 0 } , // 19 .. -33dB -9dB -3dB -33dB .. -78dB
{ 1 , 4 , 0 , 0 } , // 20 .. -30dB -6dB -8dB -33dB .. -77dB
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{ 1 , 1 , 3 , 1 } , // 21 .. -30dB -19dB 0dB -27dB .. -76dB
{ 0 , 0 , 2 , 3 } , // 22 .. -33dB -24dB -3dB -15dB .. -75dB
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{ 1 , 3 , 0 , 1 } , // 23 .. -30dB -9dB -8dB -27dB .. -74dB
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{ 1 , 6 , 0 , 0 } , // 24 .. -30dB -2dB -8dB -33dB .. -73dB
{ 0 , 7 , 1 , 0 } , // 25 .. -33dB 0dB -6dB -33dB .. -72dB
{ 0 , 6 , 2 , 0 } , // 26 .. -33dB -2dB -3dB -33dB .. -71dB
{ 2 , 1 , 3 , 1 } , // 27 .. -24dB -19dB 0dB -27dB .. -70dB
{ 0 , 3 , 1 , 2 } , // 28 .. -33dB -9dB -6dB -21dB .. -69dB
{ 0 , 0 , 0 , 6 } , // 29 .. -33dB -24dB -8dB -3dB .. -68dB
{ 0 , 5 , 2 , 1 } , // 30 .. -33dB -4dB -3dB -27dB .. -67dB
{ 0 , 0 , 1 , 6 } , // 31 .. -33dB -24dB -6dB -3dB .. -66dB
{ 1 , 2 , 3 , 2 } , // 32 .. -30dB -14dB 0dB -21dB .. -65dB
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{ 2 , 1 , 1 , 3 } , // 33 .. -24dB -19dB -6dB -15dB .. -64dB
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{ 1 , 7 , 3 , 0 } , // 34 .. -30dB 0dB 0dB -33dB .. -63dB
{ 1 , 3 , 0 , 3 } , // 35 .. -30dB -9dB -8dB -15dB .. -62dB
{ 0 , 1 , 2 , 5 } , // 36 .. -33dB -19dB -3dB -6dB .. -61dB
{ 2 , 0 , 2 , 4 } , // 37 .. -24dB -24dB -3dB -9dB .. -60dB
{ 1 , 6 , 3 , 1 } , // 38 .. -30dB -2dB 0dB -27dB .. -59dB
{ 1 , 2 , 0 , 5 } , // 39 .. -30dB -14dB -8dB -6dB .. -58dB
{ 2 , 5 , 0 , 2 } , // 40 .. -24dB -4dB -8dB -21dB .. -57dB
{ 2 , 6 , 2 , 1 } , // 41 .. -24dB -2dB -3dB -27dB .. -56dB
{ 0 , 5 , 2 , 3 } , // 42 .. -33dB -4dB -3dB -15dB .. -55dB
{ 2 , 0 , 2 , 6 } , // 43 .. -24dB -24dB -3dB -3dB .. -54dB
{ 0 , 3 , 0 , 6 } , // 44 .. -33dB -9dB -8dB -3dB .. -53dB
{ 0 , 6 , 0 , 4 } , // 45 .. -33dB -2dB -8dB -9dB .. -52dB
{ 0 , 3 , 1 , 6 } , // 46 .. -33dB -9dB -6dB -3dB .. -51dB
{ 1 , 2 , 3 , 5 } , // 47 .. -30dB -14dB 0dB -6dB .. -50dB
{ 0 , 5 , 1 , 5 } , // 48 .. -33dB -4dB -6dB -6dB .. -49dB
{ 0 , 3 , 3 , 5 } , // 49 .. -33dB -9dB 0dB -6dB .. -48dB
{ 0 , 6 , 2 , 4 } , // 50 .. -33dB -2dB -3dB -9dB .. -47dB
{ 1 , 5 , 2 , 4 } , // 51 .. -30dB -4dB -3dB -9dB .. -46dB
{ 3 , 0 , 1 , 3 } , // 52 .. 0dB -24dB -6dB -15dB .. -45dB
{ 0 , 6 , 1 , 6 } , // 53 .. -33dB -2dB -6dB -3dB .. -44dB
{ 1 , 5 , 2 , 5 } , // 54 .. -30dB -4dB -3dB -6dB .. -43dB
{ 0 , 4 , 2 , 7 } , // 55 .. -33dB -6dB -3dB 0dB .. -42dB
{ 2 , 2 , 2 , 7 } , // 56 .. -24dB -14dB -3dB 0dB .. -41dB
{ 2 , 5 , 2 , 4 } , // 57 .. -24dB -4dB -3dB -9dB .. -40dB
{ 2 , 3 , 3 , 5 } , // 58 .. -24dB -9dB 0dB -6dB .. -39dB
{ 1 , 6 , 3 , 5 } , // 59 .. -30dB -2dB 0dB -6dB .. -38dB
{ 2 , 5 , 1 , 6 } , // 60 .. -24dB -4dB -6dB -3dB .. -37dB
{ 3 , 3 , 3 , 1 } , // 61 .. 0dB -9dB 0dB -27dB .. -36dB
{ 3 , 2 , 3 , 2 } , // 62 .. 0dB -14dB 0dB -21dB .. -35dB
{ 2 , 5 , 2 , 6 } , // 63 .. -24dB -4dB -3dB -3dB .. -34dB
{ 3 , 0 , 1 , 6 } , // 64 .. 0dB -24dB -6dB -3dB .. -33dB
{ 3 , 0 , 0 , 7 } , // 65 .. 0dB -24dB -8dB 0dB .. -32dB
{ 2 , 5 , 3 , 6 } , // 66 .. -24dB -4dB 0dB -3dB .. -31dB
{ 3 , 3 , 3 , 2 } , // 67 .. 0dB -9dB 0dB -21dB .. -30dB
{ 2 , 6 , 3 , 6 } , // 68 .. -24dB -2dB 0dB -3dB .. -29dB
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{ 3 , 2 , 0 , 5 } , // 69 .. 0dB -14dB -8dB -6dB .. -28dB
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{ 3 , 5 , 0 , 3 } , // 70 .. 0dB -4dB -8dB -15dB .. -27dB
{ 3 , 3 , 0 , 4 } , // 71 .. 0dB -9dB -8dB -9dB .. -26dB
{ 3 , 1 , 1 , 7 } , // 72 .. 0dB -19dB -6dB 0dB .. -25dB
{ 3 , 4 , 2 , 3 } , // 73 .. 0dB -6dB -3dB -15dB .. -24dB
{ 3 , 4 , 0 , 4 } , // 74 .. 0dB -6dB -8dB -9dB .. -23dB
{ 3 , 2 , 0 , 7 } , // 75 .. 0dB -14dB -8dB 0dB .. -22dB
{ 3 , 7 , 1 , 3 } , // 76 .. 0dB 0dB -6dB -15dB .. -21dB
{ 3 , 6 , 2 , 3 } , // 77 .. 0dB -2dB -3dB -15dB .. -20dB
{ 3 , 5 , 3 , 3 } , // 78 .. 0dB -4dB 0dB -15dB .. -19dB
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{ 3 , 3 , 3 , 4 } , // 79 .. 0dB -9dB 0dB -9dB .. -18dB
{ 3 , 2 , 3 , 6 } , // 80 .. 0dB -14dB 0dB -3dB .. -17dB original
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{ 3 , 6 , 0 , 5 } , // 81 .. 0dB -2dB -8dB -6dB .. -16dB
{ 3 , 7 , 1 , 4 } , // 82 .. 0dB 0dB -6dB -9dB .. -15dB
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{ 3 , 2 , 3 , 7 } , // 83 .. 0dB -14dB 0dB 0dB .. -14dB
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{ 3 , 6 , 0 , 6 } , // 84 .. 0dB -2dB -8dB -3dB .. -13dB
{ 3 , 3 , 2 , 7 } , // 85 .. 0dB -9dB -3dB 0dB .. -12dB
{ 3 , 7 , 0 , 6 } , // 86 .. 0dB 0dB -8dB -3dB .. -11dB
{ 3 , 5 , 3 , 5 } , // 87 .. 0dB -4dB 0dB -6dB .. -10dB
{ 3 , 7 , 2 , 5 } , // 88 .. 0dB 0dB -3dB -6dB .. -9dB
{ 3 , 6 , 3 , 5 } , // 89 .. 0dB -2dB 0dB -6dB .. -8dB
{ 3 , 5 , 2 , 7 } , // 90 .. 0dB -4dB -3dB 0dB .. -7dB
{ 3 , 7 , 2 , 6 } , // 91 .. 0dB 0dB -3dB -3dB .. -6dB
{ 3 , 6 , 2 , 7 } , // 92 .. 0dB -2dB -3dB 0dB .. -5dB
{ 3 , 5 , 3 , 7 } , // 93 .. 0dB -4dB 0dB 0dB .. -4dB
{ 3 , 7 , 2 , 7 } , // 94 .. 0dB 0dB -3dB 0dB .. -3dB
{ 3 , 6 , 3 , 7 } , // 95 .. 0dB -2dB 0dB 0dB .. -2dB
{ 3 , 7 , 3 , 7 } // 96 .. 0dB 0dB 0dB 0dB .. 0dB
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} ;
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const unsigned int original_index = 80 ;
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# endif
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unsigned int counter = 0 ;
int16_t orig_dB_gain = - 17 ;
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# ifdef ENABLE_AM_FIX_TEST1
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unsigned int am_fix_gain_table_index [ 2 ] = { 1 + gSetting_AM_fix_test1 , 1 + gSetting_AM_fix_test1 } ;
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# else
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unsigned int am_fix_gain_table_index [ 2 ] = { original_index , original_index } ;
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# endif
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// used to simply detect we've changed our table index/register settings
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unsigned int am_fix_gain_table_index_prev [ 2 ] = { 0 , 0 } ;
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// holds the previous RSSI level
int16_t prev_rssi [ 2 ] = { 0 , 0 } ;
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// to help reduce gain hunting, provides a peak hold time delay
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unsigned int am_gain_hold_counter [ 2 ] = { 0 , 0 } ;
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// used to correct the RSSI readings after our front end gain adjustments
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int16_t rssi_db_gain_diff [ 2 ] = { 0 , 0 } ;
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// used to limit the max front end gain
unsigned int max_index = ARRAY_SIZE ( am_fix_gain_table ) - 1 ;
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void AM_fix_init ( void )
{
/* unsigned int i;
for ( i = 0 ; i < 2 ; i + + )
{
# ifdef ENABLE_AM_FIX_TEST1
am_fix_gain_table_index [ i ] = 1 + gSetting_AM_fix_test1 ;
# else
am_fix_gain_table_index [ i ] = original_index ; // re-start with original QS setting
# endif
}
*/
orig_dB_gain = lna_short_dB [ orig_lna_short ] + lna_dB [ orig_lna ] + mixer_dB [ orig_mixer ] + pga_dB [ orig_pga ] ;
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#if 0
{ // set the maximum gain we want to use
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// const int16_t max_gain_dB = orig_dB_gain;
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const int16_t max_gain_dB = - 10 ;
max_index = ARRAY_SIZE ( am_fix_gain_table ) ;
while ( - - max_index > 1 )
{
const uint8_t lna_short = am_fix_gain_table [ max_index ] . lna_short ;
const uint8_t lna = am_fix_gain_table [ max_index ] . lna ;
const uint8_t mixer = am_fix_gain_table [ max_index ] . mixer ;
const uint8_t pga = am_fix_gain_table [ max_index ] . pga ;
const int16_t gain_dB = lna_short_dB [ lna_short ] + lna_dB [ lna ] + mixer_dB [ mixer ] + pga_dB [ pga ] ;
if ( gain_dB < = max_gain_dB )
break ;
}
}
# else
max_index = ARRAY_SIZE ( am_fix_gain_table ) - 1 ;
# endif
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}
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void AM_fix_reset ( const int vfo )
{ // reset the AM fixer
prev_rssi [ vfo ] = 0 ;
am_gain_hold_counter [ vfo ] = 0 ;
rssi_db_gain_diff [ vfo ] = 0 ;
# ifdef ENABLE_AM_FIX_TEST1
am_fix_gain_table_index [ vfo ] = 1 + gSetting_AM_fix_test1 ;
# else
am_fix_gain_table_index [ vfo ] = original_index ; // re-start with original QS setting
# endif
am_fix_gain_table_index_prev [ vfo ] = 0 ;
// AM_fix_init(); // bootup calls this
}
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// adjust the RX RF gain to try and prevent the AM demodulator from
// saturating/overloading/clipping (distorted AM audio)
//
// we're actually doing the BK4819's job for it here, but as the chip
// won't/don't do it for itself, we're left to bodging it ourself by
// playing with the RF front end gain settings
//
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void AM_fix_adjust_frontEnd_10ms ( const int vfo )
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{
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int16_t diff_dB ;
int16_t rssi ;
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# ifndef ENABLE_AM_FIX_TEST1
// -89dBm, any higher and the AM demodulator starts to saturate/clip/distort
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const int16_t desired_rssi = ( - 89 + 160 ) * 2 ; // dBm to ADC sample
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# endif
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counter + + ;
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// but we're not in FM mode, we're in AM mode
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switch ( gCurrentFunction )
{
case FUNCTION_TRANSMIT :
case FUNCTION_BAND_SCOPE :
case FUNCTION_POWER_SAVE :
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return ;
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case FUNCTION_FOREGROUND :
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// return;
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// only adjust stuff if we're in one of these modes
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case FUNCTION_RECEIVE :
case FUNCTION_MONITOR :
case FUNCTION_INCOMING :
break ;
}
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{ // sample the current RSSI level
// average it with the previous rssi (a bit of noise/spike immunity)
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const int16_t new_rssi = BK4819_GetRSSI ( ) ;
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rssi = ( prev_rssi [ vfo ] > 0 ) ? ( prev_rssi [ vfo ] + new_rssi ) / 2 : new_rssi ;
// rssi = (new_rssi > prev_rssi[vfo] && prev_rssi[vfo] > 0) ? (prev_rssi[vfo] + new_rssi) / 2 : new_rssi;
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prev_rssi [ vfo ] = new_rssi ;
}
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{ // save the corrected RSSI level
const int16_t new_rssi = rssi - ( rssi_db_gain_diff [ vfo ] * 2 ) ;
if ( gCurrentRSSI [ vfo ] ! = new_rssi )
{
gCurrentRSSI [ vfo ] = new_rssi ;
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gUpdateDisplay = ( ( counter & 15u ) = = 0 ) ; // limit the screen update rate to once every 150ms
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}
}
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# ifdef ENABLE_AM_FIX_TEST1
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// user is manually adjusting a gain register - don't do anything automatically
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{
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int i = 1 + ( int ) gSetting_AM_fix_test1 ;
i = ( i < 1 ) ? 1 : ( i > ( ( int ) ARRAY_SIZE ( am_fix_gain_table ) - 1 ) ? ARRAY_SIZE ( am_fix_gain_table ) - 1 : i ;
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if ( am_fix_gain_table_index [ vfo ] = = i )
return ; // no change
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}
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# else
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// automatically adjust the RF RX gain
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if ( am_gain_hold_counter [ vfo ] > 0 )
am_gain_hold_counter [ vfo ] - - ;
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// dB difference between actual and desired RSSI level
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diff_dB = ( rssi - desired_rssi ) / 2 ;
if ( diff_dB > 0 )
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{ // decrease gain
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unsigned int index = am_fix_gain_table_index [ vfo ] ; // current position we're at
if ( diff_dB > = 10 )
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{ // jump immediately to a new gain setting
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// this greatly speeds up initial gain reduction (but reduces noise/spike immunity)
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uint8_t lna_short = am_fix_gain_table [ index ] . lna_short ;
uint8_t lna = am_fix_gain_table [ index ] . lna ;
uint8_t mixer = am_fix_gain_table [ index ] . mixer ;
uint8_t pga = am_fix_gain_table [ index ] . pga ;
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// const int16_t desired_gain_dB = lna_short_dB[lna_short] + lna_dB[lna] + mixer_dB[mixer] + pga_dB[pga] - diff_dB;
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const int16_t desired_gain_dB = lna_short_dB [ lna_short ] + lna_dB [ lna ] + mixer_dB [ mixer ] + pga_dB [ pga ] - diff_dB + 8 ; // get no closer than 8dB (bit of noise/spike immunity)
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// scan the table to see what index to jump straight too
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while ( index > 1 )
{
index - - ;
lna_short = am_fix_gain_table [ index ] . lna_short ;
lna = am_fix_gain_table [ index ] . lna ;
mixer = am_fix_gain_table [ index ] . mixer ;
pga = am_fix_gain_table [ index ] . pga ;
{
const int16_t gain_dB = lna_short_dB [ lna_short ] + lna_dB [ lna ] + mixer_dB [ mixer ] + pga_dB [ pga ] ;
if ( gain_dB < = desired_gain_dB )
break ;
}
}
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//index = (am_fix_gain_table_index[vfo] + index) / 2; // easy does it
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}
else
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{ // incrementally reduce the gain .. taking it slow improves noise/spike immunity
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// if (index >= (1 + 3) && diff_dB >= 3)
// index -= 3; // faster gain reduction
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// else
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if ( index > 1 )
index - - ; // slow step-by-step gain reduction
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}
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index = ( index < 1 ) ? 1 : ( index > max_index ) ? max_index : index ;
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if ( am_fix_gain_table_index [ vfo ] ! = index )
{
am_fix_gain_table_index [ vfo ] = index ;
am_gain_hold_counter [ vfo ] = 30 ; // 300ms hold
}
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}
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if ( diff_dB > = - 4 ) // 4dB hysterisis (help reduce gain hunting)
am_gain_hold_counter [ vfo ] = 30 ; // 300ms hold
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if ( am_gain_hold_counter [ vfo ] = = 0 )
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{ // hold has been released, we're free to increase gain
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const unsigned int index = am_fix_gain_table_index [ vfo ] + 1 ;
am_fix_gain_table_index [ vfo ] = ( index > max_index ) ? max_index : index ; // limit the gain
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}
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if ( am_fix_gain_table_index [ vfo ] = = am_fix_gain_table_index_prev [ vfo ] )
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return ; // no gain changes have been made
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# endif
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{ // apply the new settings to the front end registers
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const unsigned int index = am_fix_gain_table_index [ vfo ] ;
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const uint8_t lna_short = am_fix_gain_table [ index ] . lna_short ;
const uint8_t lna = am_fix_gain_table [ index ] . lna ;
const uint8_t mixer = am_fix_gain_table [ index ] . mixer ;
const uint8_t pga = am_fix_gain_table [ index ] . pga ;
const int16_t gain_dB = lna_short_dB [ lna_short ] + lna_dB [ lna ] + mixer_dB [ mixer ] + pga_dB [ pga ] ;
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BK4819_WriteRegister ( BK4819_REG_13 , ( lna_short < < 8 ) | ( lna < < 5 ) | ( mixer < < 3 ) | ( pga < < 0 ) ) ;
// offset the RSSI reading to the rest of the firmware to cancel out the gain adjustments we make
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// gain difference from original QS setting
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rssi_db_gain_diff [ vfo ] = gain_dB - orig_dB_gain ;
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// remember the new table index
am_fix_gain_table_index_prev [ vfo ] = index ;
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{ // save the corrected RSSI level
const int16_t new_rssi = rssi - ( rssi_db_gain_diff [ vfo ] * 2 ) ;
if ( gCurrentRSSI [ vfo ] ! = new_rssi )
{
gCurrentRSSI [ vfo ] = new_rssi ;
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gUpdateDisplay = ( ( counter & 15u ) = = 0 ) ; // limit the screen update rate to once every 150ms
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}
}
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}
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# ifdef ENABLE_AM_FIX_SHOW_DATA
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gUpdateDisplay = ( ( counter & 15u ) = = 0 ) ; // limit the screen update rate to once every 150ms
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# endif
}
# ifdef ENABLE_AM_FIX_SHOW_DATA
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void AM_fix_print_data ( const int vfo , char * s )
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{
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// fetch current register settings
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const unsigned int index = am_fix_gain_table_index [ vfo ] ;
const uint8_t lna_short = am_fix_gain_table [ index ] . lna_short ;
const uint8_t lna = am_fix_gain_table [ index ] . lna ;
const uint8_t mixer = am_fix_gain_table [ index ] . mixer ;
const uint8_t pga = am_fix_gain_table [ index ] . pga ;
const int16_t gain_dB = lna_short_dB [ lna_short ] + lna_dB [ lna ] + mixer_dB [ mixer ] + pga_dB [ pga ] ;
if ( s ! = NULL )
sprintf ( s , " idx %2d %4ddB %3u " , index , gain_dB , prev_rssi [ vfo ] ) ;
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}
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# endif
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# endif
