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uv-k5-firmware-custom/am_fix.c

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Added AM fix on-screen debug info (table index & front end gain)
2023-09-23 12:07:46 +01:00
#include <string.h>
#include "app/generic.h"
#include "app/main.h"
#include "ARMCM0.h"
#include "am_fix.h"
#include "board.h"
#include "driver/bk4819.h"
#include "driver/system.h"
#ifdef ENABLE_AM_FIX_SHOW_DATA
#include "external/printf/printf.h"
#endif
#include "frequencies.h"
#include "functions.h"
#include "misc.h"
#include "ui/rssi.h"
// original QS front end gain 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
// stuff to overcome the AM demodulator saturation problem
//
// that is until someone works out how to properly configure the BK chip !!
// REG_10 AGC gain table
//
// <15:10> ???
//
// <9:8> = LNA Gain Short
// 3 = 0dB < original value
// 2 = -11dB
// 1 = -16dB
// 0 = -19dB
//
// <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
const int8_t lna_short_dB[4] = {-19, -16, -11, 0};
const int8_t lna_dB[8] = {-24, -19, -14, -9, -6, -4, -2, 0};
const int8_t mixer_dB[4] = { -8, -6, -3, 0};
const int8_t pga_dB[8] = {-33, -27, -21, -15, -9, -6, -3, 0};
// lookup table is by far 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
{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, 3, 5}, // 47 0dB -9dB 0dB -6dB .. -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
};
// table index that holds the original QS front end setting
const unsigned int original_index = 45;
// current table index we're using
unsigned int am_fix_gain_table_index = original_index; // start with original QS setting
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};
// used to prevent 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 moving average filter
memset(&moving_avg_rssi, 0, sizeof(moving_avg_rssi));
am_gain_hold_counter = 0;
rssi_db_gain_diff = 0;
am_fix_gain_table_index = original_index; // re-start with original QS setting
am_fix_gain_table_index_prev = 0;
}
void AM_fix_adjust_frontEnd_10ms(void)
{
// we don't play with the front end gains if in FM mode
if (!gRxVfo->IsAM)
return;
// we're in AM mode
switch (gCurrentFunction)
{
case FUNCTION_TRANSMIT:
case FUNCTION_BAND_SCOPE:
case FUNCTION_POWER_SAVE:
return;
// only adjust the front end if in one of these modes
case FUNCTION_FOREGROUND:
case FUNCTION_RECEIVE:
case FUNCTION_MONITOR:
case FUNCTION_INCOMING:
break;
}
// -87dBm, any higher and the AM demodulator starts to saturate/clip (distort)
const uint16_t desired_rssi = (-87 + 160) * 2; // dBm to ADC sample
/*
// current RX frequency
const uint32_t rx_frequency = gRxVfo->pRX->Frequency;
// max gains to use
// uint8_t max_lna_short = orig_lna_short; // we're not altering this one
uint8_t max_lna = orig_lna;
uint8_t max_mixer = orig_mixer;
uint8_t max_pga = orig_pga;
if (rx_frequency <= 22640000) // the RX sensitivity abrutly drops above this frequency
{
max_pga = 7;
}
else
{ // allow a bit more adjustment gain
// max_lna = 4;
max_lna = 7;
max_pga = 7;
}
*/
// sample the current RSSI level
uint16_t rssi = BK4819_GetRSSI(); // 9-bit value (0 .. 511)
//gCurrentRSSI = rssi - (rssi_db_gain_diff * 2);
// compute the moving average RSSI
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
if (rssi > desired_rssi)
{ // decrease gain
if (am_fix_gain_table_index > 1)
am_fix_gain_table_index--;
am_gain_hold_counter = 50; // 500ms
}
if (am_gain_hold_counter > 0)
am_gain_hold_counter--;
if (am_gain_hold_counter == 0)
{ // hold has been released, we're now free to increase gain
if (rssi < (desired_rssi - 10)) // 5dB hysterisis (helps prevent 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
// apply the new gain settings to the front end
// remember the new gain settings - for the next time this function is called
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've made here
static const int16_t orig_dB_gain = lna_short_dB[orig_lna_short & 3u] + lna_dB[orig_lna & 7u] + mixer_dB[orig_mixer & 3u] + pga_dB[orig_pga & 7u];
const int16_t am_dB_gain = lna_short_dB[lna_short & 3u] + lna_dB[lna & 7u] + mixer_dB[mixer & 3u] + pga_dB[pga & 7u];
rssi_db_gain_diff = am_dB_gain - orig_dB_gain;
}
am_fix_gain_table_index_prev = am_fix_gain_table_index;
#ifdef ENABLE_AM_FIX_SHOW_DATA
gUpdateDisplay = true;
#endif
}
#ifdef ENABLE_AM_FIX_SHOW_DATA
void AM_fix_print_data(char *s)
{
if (s == NULL)
return;
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;
const int16_t am_dB_gain = lna_short_dB[lna_short & 3u] + lna_dB[lna & 7u] + mixer_dB[mixer & 3u] + pga_dB[pga & 7u];
#if 0
sprintf(s, "%2d %3d %2d %3d %3d",
//am_fix_gain_table_index,
lna_short_dB[lna_short & 3u],
lna_dB[lna & 7u],
mixer_dB[mixer & 3u],
pga_dB[pga & 7u],
am_dB_gain);
#else
sprintf(s, "idx %2d gain %3ddB", am_fix_gain_table_index, am_dB_gain);
#endif
}
#endif
#endif
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