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kamilsss655/am_fix.c
OneOfEleven 2486501332 Re-enabled weak signal bandwidth reduction
2023-09-24 13:00:02 +01:00

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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.
*/
// code to 'try' and reduce the AM demodulator saturation problem
//
// that is until someone works out how to properly configure the BK chip !
#include <string.h>
#include "am_fix.h"
#include "app/main.h"
#include "board.h"
#include "driver/bk4819.h"
#include "external/printf/printf.h"
#include "frequencies.h"
#include "functions.h"
#include "misc.h"
#include "ui/rssi.h"
// original QS front end register settings
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
typedef struct
{
#if 1
// bitfields take up less flash bytes
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;
// REG_10 AGC gain table
//
// <15:10> ???
//
// <9:8> = LNA Gain Short
// 3 = 0dB < original value
// 2 = -24dB // was -11
// 1 = -30dB // was -16
// 0 = -33dB // was -19
//
// <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
// 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
//
// static const int16_t lna_short_dB[] = {-19, -16, -11, 0}; // was
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};
// lookup table is hugely easier than writing code to do the same
//
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
#ifdef ENABLE_AM_FIX_TEST1
// test table that lets me manually set the lna-short register
// to measure it's actual dB change using an RF signal generator
{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
};
const unsigned int original_index = 1;
#elif 0
// in this table the 'lna-short' register I leave unchanged
{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
};
const unsigned int original_index = 45;
#else
// in this table I include adjusting the 'lna-short' register ~
// more gain adjustment range from doing so
{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
{0, 2, 0, 2}, // 21 .. -33dB -14dB -8dB -21dB .. -76dB
{0, 3, 3, 0}, // 22 .. -33dB -9dB 0dB -33dB .. -75dB
{1, 3, 0, 1}, // 23 .. -30dB -9dB -8dB -27dB .. -74dB
{1, 2, 0, 2}, // 24 .. -30dB -14dB -8dB -21dB .. -73dB
{1, 1, 0, 3}, // 25 .. -30dB -19dB -8dB -15dB .. -72dB
{1, 4, 0, 1}, // 26 .. -30dB -6dB -8dB -27dB .. -71dB
{1, 5, 2, 0}, // 27 .. -30dB -4dB -3dB -33dB .. -70dB
{1, 4, 1, 1}, // 28 .. -30dB -6dB -6dB -27dB .. -69dB
{2, 2, 2, 1}, // 29 .. -24dB -14dB -3dB -27dB .. -68dB
{2, 1, 2, 2}, // 30 .. -24dB -19dB -3dB -21dB .. -67dB
{2, 0, 2, 3}, // 31 .. -24dB -24dB -3dB -15dB .. -66dB
{1, 0, 0, 6}, // 32 .. -30dB -24dB -8dB -3dB .. -65dB
{2, 1, 1, 3}, // 33 .. -24dB -19dB -6dB -15dB .. -64dB
{0, 3, 1, 3}, // 34 .. -33dB -9dB -6dB -15dB .. -63dB
{2, 3, 0, 2}, // 35 .. -24dB -9dB -8dB -21dB .. -62dB
{2, 1, 2, 3}, // 36 .. -24dB -19dB -3dB -15dB .. -61dB
{2, 3, 1, 2}, // 37 .. -24dB -9dB -6dB -21dB .. -60dB
{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
};
const unsigned int original_index = 80;
#endif
// current table index we're using
#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
// used to simply detect we've changed our table index/register settings
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};
// to help reduce gain hunting, provides a peak hold time delay
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)
{ // reset the AM fixer
// reset the moving average filter
memset(&moving_avg_rssi, 0, sizeof(moving_avg_rssi));
am_gain_hold_counter = 0;
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
am_fix_gain_table_index_prev = 0;
}
// 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
//
void AM_fix_adjust_frontEnd_10ms(void)
{
#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
// we don't need to play with the front end gains if we're in FM mode, they
// remain as per QS original
//
if (!gRxVfo->IsAM)
return;
// but we're not in FM mode, we're in AM mode
switch (gCurrentFunction)
{
case FUNCTION_TRANSMIT:
case FUNCTION_BAND_SCOPE:
case FUNCTION_POWER_SAVE:
case FUNCTION_FOREGROUND:
return;
// only adjust stuff if we're in one of these modes
case FUNCTION_RECEIVE:
case FUNCTION_MONITOR:
case FUNCTION_INCOMING:
break;
}
// sample the current RSSI level
uint16_t rssi = BK4819_GetRSSI(); // supposed 9-bit value (0 .. 511) - never seen that though
#if 1
// compute moving average RSSI - helps smooth any sharp spikes/troughs
// but can cause gain hunting/oscillation if too long a buffer (.samples)
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
#endif
//gCurrentRSSI[gEeprom.RX_CHANNEL] = rssi - (rssi_db_gain_diff * 2);
#ifdef ENABLE_AM_FIX_TEST1
// user is manually adjusting a gain register - don't do anything automatically
am_fix_gain_table_index = 1 + gSetting_AM_fix_test1;
if (am_gain_hold_counter > 0)
if (--am_gain_hold_counter > 0)
return;
am_gain_hold_counter = 250; // 250ms hold
#else
// automatically choose a front end gain setting by monitoring the RSSI
if (rssi > desired_rssi)
{ // decrease gain
if (am_fix_gain_table_index > 1)
am_fix_gain_table_index--;
am_gain_hold_counter = 50; // 500ms hold
}
if (am_gain_hold_counter > 0)
am_gain_hold_counter--;
if (am_gain_hold_counter == 0)
// hold has been released, we're free to increase gain
if (rssi < (desired_rssi - 10)) // 5dB hysterisis (helps reduce gain hunting)
// increase gain
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)
return; // no gain changes have been made
#endif
// apply the new settings to the front end registers
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));
{ // offset the RSSI reading to the rest of the firmware to cancel out the gain adjustments we make
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];
// gain difference from original QS setting
rssi_db_gain_diff = am_dB_gain - orig_dB_gain;
// shall we or sharn't we ?
//gCurrentRSSI[gEeprom.RX_CHANNEL] = rssi - (rssi_db_gain_diff * 2);
}
// remember the new table index
am_fix_gain_table_index_prev = am_fix_gain_table_index;
#ifdef ENABLE_AM_FIX_SHOW_DATA
// trigger display update so the user can see the data as it changes
gUpdateDisplay = true;
#endif
}
#ifdef ENABLE_AM_FIX_SHOW_DATA
void AM_fix_print_data(char *s)
{
if (s == NULL)
return;
// fetch current register settings
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;
// compute the current front end gain
const int16_t dB_gain = lna_short_dB[lna_short] + lna_dB[lna] + mixer_dB[mixer] + pga_dB[pga];
sprintf(s, "idx %2d %4ddB %3u", am_fix_gain_table_index, dB_gain, BK4819_GetRSSI());
}
#endif
#endif
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