2023-09-23 11:07:46 +00:00
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2023-09-24 00:36:43 +00:00
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/* Copyright 2023 OneOfEleven
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* https://github.com/DualTachyon
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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2023-09-24 08:48:54 +00:00
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// code to 'try' and reduce the AM demodulator saturation problem
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//
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// that is until someone works out how to properly configure the BK chip !
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2023-09-23 11:07:46 +00:00
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#include <string.h>
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#include "am_fix.h"
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2023-09-24 08:48:54 +00:00
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#include "app/main.h"
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2023-09-23 11:07:46 +00:00
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#include "board.h"
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#include "driver/bk4819.h"
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2023-09-24 08:48:54 +00:00
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#include "external/printf/printf.h"
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2023-09-23 11:07:46 +00:00
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#include "frequencies.h"
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#include "functions.h"
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#include "misc.h"
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#include "ui/rssi.h"
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2023-09-24 08:48:54 +00:00
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// original QS front end register settings
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2023-09-23 11:07:46 +00:00
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const uint8_t orig_lna_short = 3; // 0dB
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const uint8_t orig_lna = 2; // -14dB
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const uint8_t orig_mixer = 3; // 0dB
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const uint8_t orig_pga = 6; // -3dB
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#ifdef ENABLE_AM_FIX
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2023-09-23 16:23:21 +00:00
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typedef struct
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{
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#if 1
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2023-09-24 08:00:34 +00:00
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// bitfields take up less flash bytes
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2023-09-23 16:23:21 +00:00
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uint8_t lna_short:2; // 0 ~ 3
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uint8_t lna:3; // 0 ~ 7
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uint8_t mixer:2; // 0 ~ 3
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uint8_t pga:3; // 0 ~ 7
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#else
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uint8_t lna_short; // 0 ~ 3
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uint8_t lna; // 0 ~ 7
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uint8_t mixer; // 0 ~ 3
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uint8_t pga; // 0 ~ 7
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#endif
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} t_am_fix_gain_table;
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//} __attribute__((packed)) t_am_fix_gain_table;
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2023-09-23 11:07:46 +00:00
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// REG_10 AGC gain table
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//
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// <15:10> ???
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//
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// <9:8> = LNA Gain Short
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// 3 = 0dB < original value
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2023-09-23 16:23:21 +00:00
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// 2 = -24dB // was -11
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// 1 = -30dB // was -16
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// 0 = -33dB // was -19
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2023-09-23 11:07:46 +00:00
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//
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// <7:5> = LNA Gain
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// 7 = 0dB
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// 6 = -2dB
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// 5 = -4dB
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// 4 = -6dB
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// 3 = -9dB
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// 2 = -14dB < original value
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// 1 = -19dB
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// 0 = -24dB
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//
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// <4:3> = MIXER Gain
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// 3 = 0dB < original value
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// 2 = -3dB
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// 1 = -6dB
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// 0 = -8dB
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//
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// <2:0> = PGA Gain
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// 7 = 0dB
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// 6 = -3dB < original value
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// 5 = -6dB
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// 4 = -9dB
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// 3 = -15dB
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// 2 = -21dB
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// 1 = -27dB
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// 0 = -33dB
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2023-09-24 12:00:02 +00:00
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// front end register dB values
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//
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// these values need to be accurate for the code to properly/reliably switch
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// between table entries when adjusting the front end registers.
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//
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// these 4 tables need a measuring/calibration update
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//
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2023-09-23 16:23:21 +00:00
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// static const int16_t lna_short_dB[] = {-19, -16, -11, 0}; // was
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2023-09-24 08:48:54 +00:00
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static const int16_t lna_short_dB[] = {-33, -30 -24, 0}; // corrected'ish
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2023-09-23 16:23:21 +00:00
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static const int16_t lna_dB[] = {-24, -19, -14, -9, -6, -4, -2, 0};
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static const int16_t mixer_dB[] = { -8, -6, -3, 0};
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static const int16_t pga_dB[] = {-33, -27, -21, -15, -9, -6, -3, 0};
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2023-09-23 11:07:46 +00:00
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2023-09-24 12:00:02 +00:00
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// lookup table is hugely easier than writing code to do the same
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2023-09-24 08:48:54 +00:00
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//
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2023-09-23 11:07:46 +00:00
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static const t_am_fix_gain_table am_fix_gain_table[] =
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{
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{.lna_short = 3, .lna = 2, .mixer = 3, .pga = 6}, // 0 0dB -14dB 0dB -3dB .. -17dB original
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2023-09-24 08:00:34 +00:00
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#ifdef ENABLE_AM_FIX_TEST1
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// test table that lets me manually set the lna-short register
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2023-09-24 08:48:54 +00:00
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// to measure it's actual dB change using an RF signal generator
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2023-09-24 08:00:34 +00:00
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2023-09-24 09:28:20 +00:00
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{0, 2, 3, 6}, // 1 .. -33dB -14dB 0dB -3dB .. -50dB
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{1, 2, 3, 6}, // 2 .. -30dB -14dB 0dB -3dB .. -47dB
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{2, 2, 3, 6}, // 3 .. -24dB -14dB 0dB -3dB .. -41dB
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{3, 2, 3, 6} // 4 .. 0dB -14dB 0dB -3dB .. -17dB
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};
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2023-09-24 12:00:02 +00:00
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2023-09-24 08:00:34 +00:00
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const unsigned int original_index = 1;
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2023-09-24 09:05:58 +00:00
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#elif 0
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2023-09-24 08:00:34 +00:00
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2023-09-24 09:05:58 +00:00
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// in this table the 'lna-short' register I leave unchanged
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2023-09-23 16:23:21 +00:00
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2023-09-24 09:28:20 +00:00
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{3, 0, 0, 0}, // 1 .. 0dB -24dB -8dB -33dB .. -65dB
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{3, 0, 1, 0}, // 2 .. 0dB -24dB -6dB -33dB .. -63dB
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{3, 0, 2, 0}, // 3 .. 0dB -24dB -3dB -33dB .. -60dB
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{3, 0, 0, 1}, // 4 .. 0dB -24dB -8dB -27dB .. -59dB
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{3, 1, 1, 0}, // 5 .. 0dB -19dB -6dB -33dB .. -58dB
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{3, 0, 1, 1}, // 6 .. 0dB -24dB -6dB -27dB .. -57dB
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{3, 1, 2, 0}, // 7 .. 0dB -19dB -3dB -33dB .. -55dB
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{3, 1, 0, 1}, // 8 .. 0dB -19dB -8dB -27dB .. -54dB
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{3, 0, 0, 2}, // 9 .. 0dB -24dB -8dB -21dB .. -53dB
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{3, 1, 1, 1}, // 10 .. 0dB -19dB -6dB -27dB .. -52dB
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{3, 0, 1, 2}, // 11 .. 0dB -24dB -6dB -21dB .. -51dB
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{3, 2, 2, 0}, // 12 .. 0dB -14dB -3dB -33dB .. -50dB
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{3, 2, 0, 1}, // 13 .. 0dB -14dB -8dB -27dB .. -49dB
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{3, 0, 2, 2}, // 14 .. 0dB -24dB -3dB -21dB .. -48dB
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{3, 2, 3, 0}, // 15 .. 0dB -14dB 0dB -33dB .. -47dB
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{3, 1, 3, 1}, // 16 .. 0dB -19dB 0dB -27dB .. -46dB
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{3, 0, 3, 2}, // 17 .. 0dB -24dB 0dB -21dB .. -45dB
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{3, 3, 0, 1}, // 18 .. 0dB -9dB -8dB -27dB .. -44dB
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{3, 1, 2, 2}, // 19 .. 0dB -19dB -3dB -21dB .. -43dB
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{3, 0, 2, 3}, // 20 .. 0dB -24dB -3dB -15dB .. -42dB
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{3, 0, 0, 4}, // 21 .. 0dB -24dB -8dB -9dB .. -41dB
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{3, 1, 1, 3}, // 22 .. 0dB -19dB -6dB -15dB .. -40dB
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{3, 0, 1, 4}, // 23 .. 0dB -24dB -6dB -9dB .. -39dB
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{3, 0, 0, 5}, // 24 .. 0dB -24dB -8dB -6dB .. -38dB
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{3, 1, 2, 3}, // 25 .. 0dB -19dB -3dB -15dB .. -37dB
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{3, 0, 2, 4}, // 26 .. 0dB -24dB -3dB -9dB .. -36dB
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{3, 4, 0, 2}, // 27 .. 0dB -6dB -8dB -21dB .. -35dB
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{3, 1, 1, 4}, // 28 .. 0dB -19dB -6dB -9dB .. -34dB
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{3, 1, 0, 5}, // 29 .. 0dB -19dB -8dB -6dB .. -33dB
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{3, 3, 0, 3}, // 30 .. 0dB -9dB -8dB -15dB .. -32dB
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{3, 5, 1, 2}, // 31 .. 0dB -4dB -6dB -21dB .. -31dB
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{3, 1, 0, 6}, // 32 .. 0dB -19dB -8dB -3dB .. -30dB
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{3, 2, 3, 3}, // 33 .. 0dB -14dB 0dB -15dB .. -29dB
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{3, 1, 1, 6}, // 34 .. 0dB -19dB -6dB -3dB .. -28dB
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{3, 4, 1, 3}, // 35 .. 0dB -6dB -6dB -15dB .. -27dB
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{3, 2, 2, 4}, // 36 .. 0dB -14dB -3dB -9dB .. -26dB
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{3, 1, 2, 6}, // 37 .. 0dB -19dB -3dB -3dB .. -25dB
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{3, 3, 1, 4}, // 38 .. 0dB -9dB -6dB -9dB .. -24dB
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{3, 2, 1, 6}, // 39 .. 0dB -14dB -6dB -3dB .. -23dB
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{3, 5, 2, 3}, // 40 .. 0dB -4dB -3dB -15dB .. -22dB
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{3, 4, 1, 4}, // 41 .. 0dB -6dB -6dB -9dB .. -21dB
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{3, 4, 0, 5}, // 42 .. 0dB -6dB -8dB -6dB .. -20dB
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{3, 5, 1, 4}, // 43 .. 0dB -4dB -6dB -9dB .. -19dB
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{3, 3, 3, 4}, // 44 .. 0dB -9dB 0dB -9dB .. -18dB
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{3, 2, 3, 6}, // 45 .. 0dB -14dB 0dB -3dB .. -17dB original
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{3, 5, 1, 5}, // 46 .. 0dB -4dB -6dB -6dB .. -16dB
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{3, 3, 1, 7}, // 47 .. 0dB -9dB -6dB 0dB .. -15dB
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{3, 2, 3, 7}, // 48 .. 0dB -14dB 0dB 0dB .. -14dB
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{3, 5, 1, 6}, // 49 .. 0dB -4dB -6dB -3dB .. -13dB
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{3, 4, 2, 6}, // 50 .. 0dB -6dB -3dB -3dB .. -12dB
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{3, 5, 2, 6}, // 51 .. 0dB -4dB -3dB -3dB .. -10dB
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{3, 4, 3, 6}, // 52 .. 0dB -6dB 0dB -3dB .. -9dB
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{3, 5, 2, 7}, // 53 .. 0dB -4dB -3dB 0dB .. -7dB
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{3, 4, 3, 7}, // 54 .. 0dB -6dB 0dB 0dB .. -6dB
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{3, 5, 3, 7} // 55 .. 0dB -4dB 0dB 0dB .. -4dB
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2023-09-23 11:07:46 +00:00
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};
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2023-09-23 16:23:21 +00:00
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const unsigned int original_index = 45;
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2023-09-24 08:00:34 +00:00
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2023-09-23 16:23:21 +00:00
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#else
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2023-09-24 09:05:58 +00:00
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// in this table I include adjusting the 'lna-short' register ~
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// more gain adjustment range from doing so
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2023-09-24 08:00:34 +00:00
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2023-09-24 09:28:20 +00:00
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{0, 0, 0, 0}, // 1 .. -33dB -24dB -8dB -33dB .. -98dB
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{0, 0, 1, 0}, // 2 .. -33dB -24dB -6dB -33dB .. -96dB
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{1, 0, 0, 0}, // 3 .. -30dB -24dB -8dB -33dB .. -95dB
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{0, 1, 0, 0}, // 4 .. -33dB -19dB -8dB -33dB .. -93dB
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{0, 0, 0, 1}, // 5 .. -33dB -24dB -8dB -27dB .. -92dB
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{0, 1, 1, 0}, // 6 .. -33dB -19dB -6dB -33dB .. -91dB
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{0, 0, 1, 1}, // 7 .. -33dB -24dB -6dB -27dB .. -90dB
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{1, 0, 0, 1}, // 8 .. -30dB -24dB -8dB -27dB .. -89dB
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{0, 1, 2, 0}, // 9 .. -33dB -19dB -3dB -33dB .. -88dB
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{1, 0, 3, 0}, // 10 .. -30dB -24dB 0dB -33dB .. -87dB
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{0, 0, 0, 2}, // 11 .. -33dB -24dB -8dB -21dB .. -86dB
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{1, 1, 2, 0}, // 12 .. -30dB -19dB -3dB -33dB .. -85dB
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{0, 0, 3, 1}, // 13 .. -33dB -24dB 0dB -27dB .. -84dB
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{0, 3, 0, 0}, // 14 .. -33dB -9dB -8dB -33dB .. -83dB
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{1, 1, 3, 0}, // 15 .. -30dB -19dB 0dB -33dB .. -82dB
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{1, 0, 3, 1}, // 16 .. -30dB -24dB 0dB -27dB .. -81dB
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{0, 2, 3, 0}, // 17 .. -33dB -14dB 0dB -33dB .. -80dB
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{1, 2, 0, 1}, // 18 .. -30dB -14dB -8dB -27dB .. -79dB
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{0, 3, 2, 0}, // 19 .. -33dB -9dB -3dB -33dB .. -78dB
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{1, 4, 0, 0}, // 20 .. -30dB -6dB -8dB -33dB .. -77dB
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{0, 2, 0, 2}, // 21 .. -33dB -14dB -8dB -21dB .. -76dB
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{0, 3, 3, 0}, // 22 .. -33dB -9dB 0dB -33dB .. -75dB
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{1, 3, 0, 1}, // 23 .. -30dB -9dB -8dB -27dB .. -74dB
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{1, 2, 0, 2}, // 24 .. -30dB -14dB -8dB -21dB .. -73dB
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{1, 1, 0, 3}, // 25 .. -30dB -19dB -8dB -15dB .. -72dB
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{1, 4, 0, 1}, // 26 .. -30dB -6dB -8dB -27dB .. -71dB
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{1, 5, 2, 0}, // 27 .. -30dB -4dB -3dB -33dB .. -70dB
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{1, 4, 1, 1}, // 28 .. -30dB -6dB -6dB -27dB .. -69dB
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{2, 2, 2, 1}, // 29 .. -24dB -14dB -3dB -27dB .. -68dB
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{2, 1, 2, 2}, // 30 .. -24dB -19dB -3dB -21dB .. -67dB
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{2, 0, 2, 3}, // 31 .. -24dB -24dB -3dB -15dB .. -66dB
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{1, 0, 0, 6}, // 32 .. -30dB -24dB -8dB -3dB .. -65dB
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{2, 1, 1, 3}, // 33 .. -24dB -19dB -6dB -15dB .. -64dB
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{0, 3, 1, 3}, // 34 .. -33dB -9dB -6dB -15dB .. -63dB
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{2, 3, 0, 2}, // 35 .. -24dB -9dB -8dB -21dB .. -62dB
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{2, 1, 2, 3}, // 36 .. -24dB -19dB -3dB -15dB .. -61dB
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{2, 3, 1, 2}, // 37 .. -24dB -9dB -6dB -21dB .. -60dB
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{2, 2, 3, 2}, // 38 .. -24dB -14dB 0dB -21dB .. -59dB
|
|
|
|
|
{2, 1, 1, 4}, // 39 .. -24dB -19dB -6dB -9dB .. -58dB
|
|
|
|
|
{2, 4, 1, 2}, // 40 .. -24dB -6dB -6dB -21dB .. -57dB
|
|
|
|
|
{1, 2, 2, 4}, // 41 .. -30dB -14dB -3dB -9dB .. -56dB
|
|
|
|
|
{2, 1, 1, 5}, // 42 .. -24dB -19dB -6dB -6dB .. -55dB
|
|
|
|
|
{2, 3, 3, 2}, // 43 .. -24dB -9dB 0dB -21dB .. -54dB
|
|
|
|
|
{1, 3, 0, 5}, // 44 .. -30dB -9dB -8dB -6dB .. -53dB
|
|
|
|
|
{1, 5, 2, 3}, // 45 .. -30dB -4dB -3dB -15dB .. -52dB
|
|
|
|
|
{1, 3, 1, 5}, // 46 .. -30dB -9dB -6dB -6dB .. -51dB
|
|
|
|
|
{0, 2, 2, 7}, // 47 .. -33dB -14dB -3dB 0dB .. -50dB
|
|
|
|
|
{2, 1, 1, 7}, // 48 .. -24dB -19dB -6dB 0dB .. -49dB
|
|
|
|
|
{0, 4, 2, 5}, // 49 .. -33dB -6dB -3dB -6dB .. -48dB
|
|
|
|
|
{1, 2, 3, 6}, // 50 .. -30dB -14dB 0dB -3dB .. -47dB
|
|
|
|
|
{1, 5, 1, 5}, // 51 .. -30dB -4dB -6dB -6dB .. -46dB
|
|
|
|
|
{3, 0, 3, 2}, // 52 .. 0dB -24dB 0dB -21dB .. -45dB
|
|
|
|
|
{3, 2, 2, 1}, // 53 .. 0dB -14dB -3dB -27dB .. -44dB
|
|
|
|
|
{2, 5, 1, 4}, // 54 .. -24dB -4dB -6dB -9dB .. -43dB
|
|
|
|
|
{1, 4, 2, 6}, // 55 .. -30dB -6dB -3dB -3dB .. -42dB
|
|
|
|
|
{3, 0, 0, 4}, // 56 .. 0dB -24dB -8dB -9dB .. -41dB
|
|
|
|
|
{0, 5, 3, 6}, // 57 .. -33dB -4dB 0dB -3dB .. -40dB
|
|
|
|
|
{2, 4, 2, 5}, // 58 .. -24dB -6dB -3dB -6dB .. -39dB
|
|
|
|
|
{3, 0, 0, 5}, // 59 .. 0dB -24dB -8dB -6dB .. -38dB
|
|
|
|
|
{0, 5, 3, 7}, // 60 .. -33dB -4dB 0dB 0dB .. -37dB
|
|
|
|
|
{2, 3, 3, 6}, // 61 .. -24dB -9dB 0dB -3dB .. -36dB
|
|
|
|
|
{3, 4, 0, 2}, // 62 .. 0dB -6dB -8dB -21dB .. -35dB
|
|
|
|
|
{3, 1, 1, 4}, // 63 .. 0dB -19dB -6dB -9dB .. -34dB
|
|
|
|
|
{3, 0, 3, 4}, // 64 .. 0dB -24dB 0dB -9dB .. -33dB
|
|
|
|
|
{3, 3, 0, 3}, // 65 .. 0dB -9dB -8dB -15dB .. -32dB
|
|
|
|
|
{3, 1, 1, 5}, // 66 .. 0dB -19dB -6dB -6dB .. -31dB
|
|
|
|
|
{3, 0, 2, 6}, // 67 .. 0dB -24dB -3dB -3dB .. -30dB
|
|
|
|
|
{3, 2, 3, 3}, // 68 .. 0dB -14dB 0dB -15dB .. -29dB
|
|
|
|
|
{3, 2, 0, 5}, // 69 .. 0dB -14dB -8dB -6dB .. -28dB
|
|
|
|
|
{3, 4, 1, 3}, // 70 .. 0dB -6dB -6dB -15dB .. -27dB
|
|
|
|
|
{3, 2, 2, 4}, // 71 .. 0dB -14dB -3dB -9dB .. -26dB
|
|
|
|
|
{3, 1, 2, 6}, // 72 .. 0dB -19dB -3dB -3dB .. -25dB
|
|
|
|
|
{3, 3, 1, 4}, // 73 .. 0dB -9dB -6dB -9dB .. -24dB
|
|
|
|
|
{3, 2, 1, 6}, // 74 .. 0dB -14dB -6dB -3dB .. -23dB
|
|
|
|
|
{3, 5, 2, 3}, // 75 .. 0dB -4dB -3dB -15dB .. -22dB
|
|
|
|
|
{3, 4, 1, 4}, // 76 .. 0dB -6dB -6dB -9dB .. -21dB
|
|
|
|
|
{3, 4, 0, 5}, // 77 .. 0dB -6dB -8dB -6dB .. -20dB
|
|
|
|
|
{3, 5, 1, 4}, // 78 .. 0dB -4dB -6dB -9dB .. -19dB
|
|
|
|
|
{3, 3, 3, 4}, // 79 .. 0dB -9dB 0dB -9dB .. -18dB
|
|
|
|
|
{3, 2, 3, 6}, // 80 .. 0dB -14dB 0dB -3dB .. -17dB original
|
|
|
|
|
{3, 5, 1, 5}, // 81 .. 0dB -4dB -6dB -6dB .. -16dB
|
|
|
|
|
{3, 3, 1, 7}, // 82 .. 0dB -9dB -6dB 0dB .. -15dB
|
|
|
|
|
{3, 2, 3, 7}, // 83 .. 0dB -14dB 0dB 0dB .. -14dB
|
|
|
|
|
{3, 5, 1, 6}, // 84 .. 0dB -4dB -6dB -3dB .. -13dB
|
|
|
|
|
{3, 4, 2, 6}, // 85 .. 0dB -6dB -3dB -3dB .. -12dB
|
|
|
|
|
{3, 5, 2, 6}, // 86 .. 0dB -4dB -3dB -3dB .. -10dB
|
|
|
|
|
{3, 4, 3, 6}, // 87 .. 0dB -6dB 0dB -3dB .. -9dB
|
|
|
|
|
{3, 5, 2, 7}, // 88 .. 0dB -4dB -3dB 0dB .. -7dB
|
|
|
|
|
{3, 4, 3, 7}, // 89 .. 0dB -6dB 0dB 0dB .. -6dB
|
|
|
|
|
{3, 5, 3, 7} // 90 .. 0dB -4dB 0dB 0dB .. -4dB
|
2023-09-23 16:23:21 +00:00
|
|
|
};
|
2023-09-24 08:00:34 +00:00
|
|
|
|
2023-09-24 09:05:58 +00:00
|
|
|
const unsigned int original_index = 80;
|
2023-09-24 08:00:34 +00:00
|
|
|
|
2023-09-23 16:23:21 +00:00
|
|
|
#endif
|
2023-09-23 11:07:46 +00:00
|
|
|
|
|
|
|
|
// current table index we're using
|
2023-09-23 16:23:21 +00:00
|
|
|
#ifdef ENABLE_AM_FIX_TEST1
|
|
|
|
|
unsigned int am_fix_gain_table_index = 1;
|
|
|
|
|
#else
|
|
|
|
|
unsigned int am_fix_gain_table_index = original_index; // start with original QS setting
|
|
|
|
|
#endif
|
2023-09-24 12:00:02 +00:00
|
|
|
|
|
|
|
|
// used to simply detect we've changed our table index/register settings
|
2023-09-23 11:07:46 +00:00
|
|
|
unsigned int am_fix_gain_table_index_prev = 0;
|
|
|
|
|
|
|
|
|
|
// moving average RSSI buffer
|
|
|
|
|
// helps smooth out any spikey RSSI readings
|
|
|
|
|
struct {
|
|
|
|
|
unsigned int count; //
|
|
|
|
|
unsigned int index; // read/write buffer index
|
|
|
|
|
uint16_t samples[4]; // 40ms long buffer (10ms RSSI sample rate)
|
|
|
|
|
uint16_t sum; // sum of all samples in the buffer
|
|
|
|
|
} moving_avg_rssi = {0};
|
|
|
|
|
|
2023-09-24 12:00:02 +00:00
|
|
|
// to help reduce gain hunting, provides a peak hold time delay
|
2023-09-23 11:07:46 +00:00
|
|
|
unsigned int am_gain_hold_counter = 0;
|
|
|
|
|
|
|
|
|
|
// used to correct the RSSI readings after our front end gain adjustments
|
|
|
|
|
int16_t rssi_db_gain_diff = 0;
|
|
|
|
|
|
|
|
|
|
void AM_fix_reset(void)
|
2023-09-24 12:00:02 +00:00
|
|
|
{ // reset the AM fixer
|
|
|
|
|
|
2023-09-23 11:07:46 +00:00
|
|
|
// reset the moving average filter
|
|
|
|
|
memset(&moving_avg_rssi, 0, sizeof(moving_avg_rssi));
|
|
|
|
|
|
|
|
|
|
am_gain_hold_counter = 0;
|
|
|
|
|
|
2023-09-23 16:23:21 +00:00
|
|
|
rssi_db_gain_diff = 0;
|
|
|
|
|
|
|
|
|
|
#ifdef ENABLE_AM_FIX_TEST1
|
|
|
|
|
am_fix_gain_table_index = 1 + gSetting_AM_fix_test1;
|
|
|
|
|
#else
|
|
|
|
|
am_fix_gain_table_index = original_index; // re-start with original QS setting
|
|
|
|
|
#endif
|
2023-09-24 12:00:02 +00:00
|
|
|
|
2023-09-23 11:07:46 +00:00
|
|
|
am_fix_gain_table_index_prev = 0;
|
|
|
|
|
}
|
|
|
|
|
|
2023-09-24 12:00:02 +00:00
|
|
|
// 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
|
|
|
|
|
//
|
2023-09-23 11:07:46 +00:00
|
|
|
void AM_fix_adjust_frontEnd_10ms(void)
|
|
|
|
|
{
|
2023-09-24 08:00:34 +00:00
|
|
|
#ifndef ENABLE_AM_FIX_TEST1
|
|
|
|
|
// -89dBm, any higher and the AM demodulator starts to saturate/clip/distort
|
|
|
|
|
const uint16_t desired_rssi = (-89 + 160) * 2; // dBm to ADC sample
|
|
|
|
|
#endif
|
|
|
|
|
|
2023-09-24 12:00:02 +00:00
|
|
|
// we don't need to play with the front end gains if we're in FM mode, they
|
|
|
|
|
// remain as per QS original
|
|
|
|
|
//
|
2023-09-23 11:07:46 +00:00
|
|
|
if (!gRxVfo->IsAM)
|
|
|
|
|
return;
|
|
|
|
|
|
2023-09-24 12:00:02 +00:00
|
|
|
// but we're not in FM mode, we're in AM mode
|
2023-09-23 11:07:46 +00:00
|
|
|
|
|
|
|
|
switch (gCurrentFunction)
|
|
|
|
|
{
|
|
|
|
|
case FUNCTION_TRANSMIT:
|
|
|
|
|
case FUNCTION_BAND_SCOPE:
|
|
|
|
|
case FUNCTION_POWER_SAVE:
|
2023-09-23 16:23:21 +00:00
|
|
|
case FUNCTION_FOREGROUND:
|
2023-09-23 11:07:46 +00:00
|
|
|
return;
|
|
|
|
|
|
2023-09-24 12:00:02 +00:00
|
|
|
// only adjust stuff if we're in one of these modes
|
2023-09-23 11:07:46 +00:00
|
|
|
case FUNCTION_RECEIVE:
|
|
|
|
|
case FUNCTION_MONITOR:
|
|
|
|
|
case FUNCTION_INCOMING:
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// sample the current RSSI level
|
2023-09-24 12:00:02 +00:00
|
|
|
uint16_t rssi = BK4819_GetRSSI(); // supposed 9-bit value (0 .. 511) - never seen that though
|
2023-09-24 08:00:34 +00:00
|
|
|
|
2023-09-23 16:23:21 +00:00
|
|
|
#if 1
|
2023-09-24 12:00:02 +00:00
|
|
|
// compute moving average RSSI - helps smooth any sharp spikes/troughs
|
|
|
|
|
// but can cause gain hunting/oscillation if too long a buffer (.samples)
|
2023-09-23 11:07:46 +00:00
|
|
|
if (moving_avg_rssi.count < ARRAY_SIZE(moving_avg_rssi.samples))
|
|
|
|
|
moving_avg_rssi.count++;
|
|
|
|
|
moving_avg_rssi.sum -= moving_avg_rssi.samples[moving_avg_rssi.index]; // subtract the oldest sample
|
|
|
|
|
moving_avg_rssi.sum += rssi; // add the newest sample
|
|
|
|
|
moving_avg_rssi.samples[moving_avg_rssi.index] = rssi; // save the newest sample
|
|
|
|
|
if (++moving_avg_rssi.index >= ARRAY_SIZE(moving_avg_rssi.samples)) //
|
|
|
|
|
moving_avg_rssi.index = 0; //
|
|
|
|
|
rssi = moving_avg_rssi.sum / moving_avg_rssi.count; // compute the average of the past 'n' samples
|
2023-09-23 16:23:21 +00:00
|
|
|
#endif
|
|
|
|
|
|
2023-09-24 08:00:34 +00:00
|
|
|
//gCurrentRSSI[gEeprom.RX_CHANNEL] = rssi - (rssi_db_gain_diff * 2);
|
|
|
|
|
|
2023-09-23 16:23:21 +00:00
|
|
|
#ifdef ENABLE_AM_FIX_TEST1
|
2023-09-24 08:00:34 +00:00
|
|
|
|
2023-09-24 12:00:02 +00:00
|
|
|
// user is manually adjusting a gain register - don't do anything automatically
|
|
|
|
|
|
2023-09-23 16:23:21 +00:00
|
|
|
am_fix_gain_table_index = 1 + gSetting_AM_fix_test1;
|
|
|
|
|
|
|
|
|
|
if (am_gain_hold_counter > 0)
|
|
|
|
|
if (--am_gain_hold_counter > 0)
|
|
|
|
|
return;
|
|
|
|
|
|
2023-09-24 12:00:02 +00:00
|
|
|
am_gain_hold_counter = 250; // 250ms hold
|
2023-09-23 11:07:46 +00:00
|
|
|
|
2023-09-23 16:23:21 +00:00
|
|
|
#else
|
2023-09-24 12:00:02 +00:00
|
|
|
|
|
|
|
|
// automatically choose a front end gain setting by monitoring the RSSI
|
|
|
|
|
|
2023-09-23 11:07:46 +00:00
|
|
|
if (rssi > desired_rssi)
|
|
|
|
|
{ // decrease gain
|
|
|
|
|
|
|
|
|
|
if (am_fix_gain_table_index > 1)
|
|
|
|
|
am_fix_gain_table_index--;
|
|
|
|
|
|
2023-09-24 12:00:02 +00:00
|
|
|
am_gain_hold_counter = 50; // 500ms hold
|
2023-09-23 11:07:46 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (am_gain_hold_counter > 0)
|
|
|
|
|
am_gain_hold_counter--;
|
|
|
|
|
|
|
|
|
|
if (am_gain_hold_counter == 0)
|
2023-09-24 12:00:02 +00:00
|
|
|
// hold has been released, we're free to increase gain
|
2023-09-24 08:00:34 +00:00
|
|
|
if (rssi < (desired_rssi - 10)) // 5dB hysterisis (helps reduce gain hunting)
|
2023-09-24 12:00:02 +00:00
|
|
|
// increase gain
|
2023-09-23 11:07:46 +00:00
|
|
|
if (am_fix_gain_table_index < (ARRAY_SIZE(am_fix_gain_table) - 1))
|
|
|
|
|
am_fix_gain_table_index++;
|
|
|
|
|
|
|
|
|
|
if (am_fix_gain_table_index == am_fix_gain_table_index_prev)
|
2023-09-24 08:00:34 +00:00
|
|
|
return; // no gain changes have been made
|
2023-09-24 12:00:02 +00:00
|
|
|
|
2023-09-23 16:23:21 +00:00
|
|
|
#endif
|
2023-09-23 11:07:46 +00:00
|
|
|
|
2023-09-24 08:00:34 +00:00
|
|
|
// apply the new settings to the front end registers
|
2023-09-23 11:07:46 +00:00
|
|
|
const uint16_t lna_short = am_fix_gain_table[am_fix_gain_table_index].lna_short;
|
|
|
|
|
const uint16_t lna = am_fix_gain_table[am_fix_gain_table_index].lna;
|
|
|
|
|
const uint16_t mixer = am_fix_gain_table[am_fix_gain_table_index].mixer;
|
|
|
|
|
const uint16_t pga = am_fix_gain_table[am_fix_gain_table_index].pga;
|
|
|
|
|
BK4819_WriteRegister(BK4819_REG_13, (lna_short << 8) | (lna << 5) | (mixer << 3) | (pga << 0));
|
|
|
|
|
|
2023-09-24 09:28:20 +00:00
|
|
|
{ // offset the RSSI reading to the rest of the firmware to cancel out the gain adjustments we make
|
2023-09-24 08:00:34 +00:00
|
|
|
|
|
|
|
|
const int16_t orig_dB_gain = lna_short_dB[orig_lna_short] + lna_dB[orig_lna] + mixer_dB[orig_mixer] + pga_dB[orig_pga];
|
|
|
|
|
const int16_t am_dB_gain = lna_short_dB[lna_short] + lna_dB[lna] + mixer_dB[mixer] + pga_dB[pga];
|
2023-09-23 11:07:46 +00:00
|
|
|
|
2023-09-24 09:28:20 +00:00
|
|
|
// gain difference from original QS setting
|
2023-09-23 11:07:46 +00:00
|
|
|
rssi_db_gain_diff = am_dB_gain - orig_dB_gain;
|
2023-09-24 08:00:34 +00:00
|
|
|
|
2023-09-24 12:00:02 +00:00
|
|
|
// shall we or sharn't we ?
|
2023-09-24 08:00:34 +00:00
|
|
|
//gCurrentRSSI[gEeprom.RX_CHANNEL] = rssi - (rssi_db_gain_diff * 2);
|
2023-09-23 11:07:46 +00:00
|
|
|
}
|
|
|
|
|
|
2023-09-24 08:00:34 +00:00
|
|
|
// remember the new table index
|
2023-09-23 11:07:46 +00:00
|
|
|
am_fix_gain_table_index_prev = am_fix_gain_table_index;
|
|
|
|
|
|
|
|
|
|
#ifdef ENABLE_AM_FIX_SHOW_DATA
|
2023-09-24 12:00:02 +00:00
|
|
|
// trigger display update so the user can see the data as it changes
|
2023-09-23 11:07:46 +00:00
|
|
|
gUpdateDisplay = true;
|
|
|
|
|
#endif
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#ifdef ENABLE_AM_FIX_SHOW_DATA
|
2023-09-24 08:00:34 +00:00
|
|
|
|
2023-09-23 11:07:46 +00:00
|
|
|
void AM_fix_print_data(char *s)
|
|
|
|
|
{
|
|
|
|
|
if (s == NULL)
|
|
|
|
|
return;
|
2023-09-23 16:23:21 +00:00
|
|
|
|
2023-09-24 08:00:34 +00:00
|
|
|
// fetch current register settings
|
2023-09-23 16:23:21 +00:00
|
|
|
const uint16_t lna_short = am_fix_gain_table[am_fix_gain_table_index].lna_short;
|
|
|
|
|
const uint16_t lna = am_fix_gain_table[am_fix_gain_table_index].lna;
|
|
|
|
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const uint16_t mixer = am_fix_gain_table[am_fix_gain_table_index].mixer;
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const uint16_t pga = am_fix_gain_table[am_fix_gain_table_index].pga;
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2023-09-24 08:00:34 +00:00
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// compute the current front end gain
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const int16_t dB_gain = lna_short_dB[lna_short] + lna_dB[lna] + mixer_dB[mixer] + pga_dB[pga];
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2023-09-23 16:23:21 +00:00
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2023-09-24 08:00:34 +00:00
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sprintf(s, "idx %2d %4ddB %3u", am_fix_gain_table_index, dB_gain, BK4819_GetRSSI());
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2023-09-23 11:07:46 +00:00
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}
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2023-09-24 08:00:34 +00:00
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2023-09-23 11:07:46 +00:00
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#endif
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2023-09-23 16:23:21 +00:00
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2023-09-23 11:07:46 +00:00
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#endif
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