2023-09-23 12:07:46 +01:00
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#include <string.h>
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#include "app/generic.h"
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#include "app/main.h"
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#include "ARMCM0.h"
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#include "am_fix.h"
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#include "board.h"
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#include "driver/bk4819.h"
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#include "driver/system.h"
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#ifdef ENABLE_AM_FIX_SHOW_DATA
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#include "external/printf/printf.h"
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#endif
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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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// original QS front end gain settings
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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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// stuff to overcome 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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// 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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// 2 = -11dB
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// 1 = -16dB
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// 0 = -19dB
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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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// front end register dB values
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const int8_t lna_short_dB[4] = {-19, -16, -11, 0};
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const int8_t lna_dB[8] = {-24, -19, -14, -9, -6, -4, -2, 0};
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const int8_t mixer_dB[4] = { -8, -6, -3, 0};
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const int8_t pga_dB[8] = {-33, -27, -21, -15, -9, -6, -3, 0};
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// lookup table is by far easier than writing code to do the same
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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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2023-09-23 12:32:29 +01:00
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{0, 0, 0, 0}, // 1 -19dB -24dB -8dB -33dB .. -84dB
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{0, 0, 1, 0}, // 2 -19dB -24dB -6dB -33dB .. -82dB
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{1, 0, 0, 0}, // 3 -16dB -24dB -8dB -33dB .. -81dB
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{0, 1, 0, 0}, // 4 -19dB -19dB -8dB -33dB .. -79dB
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{0, 0, 0, 1}, // 5 -19dB -24dB -8dB -27dB .. -78dB
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{0, 1, 1, 0}, // 6 -19dB -19dB -6dB -33dB .. -77dB
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{0, 0, 1, 1}, // 7 -19dB -24dB -6dB -27dB .. -76dB
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{1, 0, 0, 1}, // 8 -16dB -24dB -8dB -27dB .. -75dB
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{0, 1, 2, 0}, // 9 -19dB -19dB -3dB -33dB .. -74dB
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{0, 1, 0, 1}, // 10 -19dB -19dB -8dB -27dB .. -73dB
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{0, 0, 0, 2}, // 11 -19dB -24dB -8dB -21dB .. -72dB
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{1, 1, 2, 0}, // 12 -16dB -19dB -3dB -33dB .. -71dB
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{1, 1, 0, 1}, // 13 -16dB -19dB -8dB -27dB .. -70dB
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{1, 0, 0, 2}, // 14 -16dB -24dB -8dB -21dB .. -69dB
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{0, 2, 0, 1}, // 15 -19dB -14dB -8dB -27dB .. -68dB
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{0, 3, 1, 0}, // 16 -19dB -9dB -6dB -33dB .. -67dB
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{0, 2, 3, 0}, // 17 -19dB -14dB 0dB -33dB .. -66dB
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{1, 1, 2, 1}, // 18 -16dB -19dB -3dB -27dB .. -65dB
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{0, 0, 1, 3}, // 19 -19dB -24dB -6dB -15dB .. -64dB
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{1, 0, 0, 3}, // 20 -16dB -24dB -8dB -15dB .. -63dB
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{1, 1, 3, 1}, // 21 -16dB -19dB 0dB -27dB .. -62dB
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{0, 3, 1, 1}, // 22 -19dB -9dB -6dB -27dB .. -61dB
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{1, 2, 2, 1}, // 23 -16dB -14dB -3dB -27dB .. -60dB
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{1, 5, 1, 0}, // 24 -16dB -4dB -6dB -33dB .. -59dB
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{0, 3, 2, 1}, // 25 -19dB -9dB -3dB -27dB .. -58dB
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{0, 2, 2, 2}, // 26 -19dB -14dB -3dB -21dB .. -57dB
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{2, 3, 2, 0}, // 27 -11dB -9dB -3dB -33dB .. -56dB
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{2, 3, 0, 1}, // 28 -11dB -9dB -8dB -27dB .. -55dB
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{2, 1, 2, 2}, // 29 -11dB -19dB -3dB -21dB .. -54dB
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{0, 1, 1, 4}, // 30 -19dB -19dB -6dB -9dB .. -53dB
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{0, 4, 1, 2}, // 31 -19dB -6dB -6dB -21dB .. -52dB
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{1, 2, 1, 3}, // 32 -16dB -14dB -6dB -15dB .. -51dB
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{0, 5, 1, 2}, // 33 -19dB -4dB -6dB -21dB .. -50dB
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{2, 3, 0, 2}, // 34 -11dB -9dB -8dB -21dB .. -49dB
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{0, 2, 1, 4}, // 35 -19dB -14dB -6dB -9dB .. -48dB
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{2, 4, 2, 1}, // 36 -11dB -6dB -3dB -27dB .. -47dB
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{2, 2, 3, 2}, // 37 -11dB -14dB 0dB -21dB .. -46dB
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{2, 1, 3, 3}, // 38 -11dB -19dB 0dB -15dB .. -45dB
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{2, 3, 2, 2}, // 39 -11dB -9dB -3dB -21dB .. -44dB
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{1, 0, 3, 6}, // 40 -16dB -24dB 0dB -3dB .. -43dB
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{2, 5, 3, 1}, // 41 -11dB -4dB 0dB -27dB .. -42dB
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{2, 1, 0, 6}, // 42 -11dB -19dB -8dB -3dB .. -41dB
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{1, 3, 1, 4}, // 43 -16dB -9dB -6dB -9dB .. -40dB
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{0, 3, 0, 6}, // 44 -19dB -9dB -8dB -3dB .. -39dB
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{0, 5, 3, 3}, // 45 -19dB -4dB 0dB -15dB .. -38dB
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{2, 2, 1, 5}, // 46 -11dB -14dB -6dB -6dB .. -37dB
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{2, 5, 3, 2}, // 47 -11dB -4dB 0dB -21dB .. -36dB
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{3, 2, 3, 2}, // 48 0dB -14dB 0dB -21dB .. -35dB
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{0, 4, 2, 5}, // 49 -19dB -6dB -3dB -6dB .. -34dB
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{3, 0, 1, 6}, // 50 0dB -24dB -6dB -3dB .. -33dB
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{3, 0, 0, 7}, // 51 0dB -24dB -8dB 0dB .. -32dB
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{3, 2, 0, 4}, // 52 0dB -14dB -8dB -9dB .. -31dB
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{1, 2, 3, 7}, // 53 -16dB -14dB 0dB 0dB .. -30dB
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{2, 4, 2, 4}, // 54 -11dB -6dB -3dB -9dB .. -29dB
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{3, 1, 1, 6}, // 55 0dB -19dB -6dB -3dB .. -28dB
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{3, 5, 0, 3}, // 56 0dB -4dB -8dB -15dB .. -27dB
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{2, 4, 3, 4}, // 57 -11dB -6dB 0dB -9dB .. -26dB
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{1, 4, 3, 6}, // 58 -16dB -6dB 0dB -3dB .. -25dB
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{3, 3, 1, 4}, // 59 0dB -9dB -6dB -9dB .. -24dB
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{2, 3, 3, 6}, // 60 -11dB -9dB 0dB -3dB .. -23dB
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{3, 2, 0, 7}, // 61 0dB -14dB -8dB 0dB .. -22dB
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{3, 3, 2, 4}, // 62 0dB -9dB -3dB -9dB .. -21dB
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{2, 4, 3, 6}, // 63 -11dB -6dB 0dB -3dB .. -20dB
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{3, 5, 1, 4}, // 64 0dB -4dB -6dB -9dB .. -19dB
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{3, 3, 1, 6}, // 65 0dB -9dB -6dB -3dB .. -18dB
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{3, 2, 3, 6}, // 66 0dB -14dB 0dB -3dB .. -17dB original
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{3, 5, 1, 5}, // 67 0dB -4dB -6dB -6dB .. -16dB
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{3, 5, 0, 6}, // 68 0dB -4dB -8dB -3dB .. -15dB
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{3, 2, 3, 7}, // 69 0dB -14dB 0dB 0dB .. -14dB
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{3, 5, 1, 6}, // 70 0dB -4dB -6dB -3dB .. -13dB
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{3, 4, 2, 6}, // 71 0dB -6dB -3dB -3dB .. -12dB
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{3, 5, 2, 6}, // 72 0dB -4dB -3dB -3dB .. -10dB
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{3, 4, 3, 6}, // 73 0dB -6dB 0dB -3dB .. -9dB
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{3, 5, 2, 7}, // 74 0dB -4dB -3dB 0dB .. -7dB
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{3, 4, 3, 7}, // 75 0dB -6dB 0dB 0dB .. -6dB
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{3, 5, 3, 7}, // 76 0dB -4dB 0dB 0dB .. -4dB
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2023-09-23 12:07:46 +01:00
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};
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// table index that holds the original QS front end setting
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2023-09-23 12:32:29 +01:00
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const unsigned int original_index = 66;
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2023-09-23 12:07:46 +01:00
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// current table index we're using
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unsigned int am_fix_gain_table_index = original_index; // start with original QS setting
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unsigned int am_fix_gain_table_index_prev = 0;
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// moving average RSSI buffer
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// helps smooth out any spikey RSSI readings
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struct {
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unsigned int count; //
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unsigned int index; // read/write buffer index
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uint16_t samples[4]; // 40ms long buffer (10ms RSSI sample rate)
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uint16_t sum; // sum of all samples in the buffer
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} moving_avg_rssi = {0};
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// used to prevent gain hunting, provides a peak hold time delay
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unsigned int am_gain_hold_counter = 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 = 0;
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void AM_fix_reset(void)
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{
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// reset the moving average filter
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memset(&moving_avg_rssi, 0, sizeof(moving_avg_rssi));
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am_gain_hold_counter = 0;
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rssi_db_gain_diff = 0;
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am_fix_gain_table_index = original_index; // re-start with original QS setting
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am_fix_gain_table_index_prev = 0;
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}
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void AM_fix_adjust_frontEnd_10ms(void)
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{
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// we don't play with the front end gains if in FM mode
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if (!gRxVfo->IsAM)
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return;
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// we're in AM mode
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switch (gCurrentFunction)
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{
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case FUNCTION_TRANSMIT:
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case FUNCTION_BAND_SCOPE:
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case FUNCTION_POWER_SAVE:
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return;
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// only adjust the front end if in one of these modes
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case FUNCTION_FOREGROUND:
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case FUNCTION_RECEIVE:
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case FUNCTION_MONITOR:
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case FUNCTION_INCOMING:
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break;
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}
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// -87dBm, any higher and the AM demodulator starts to saturate/clip (distort)
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const uint16_t desired_rssi = (-87 + 160) * 2; // dBm to ADC sample
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/*
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// current RX frequency
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const uint32_t rx_frequency = gRxVfo->pRX->Frequency;
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// max gains to use
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// uint8_t max_lna_short = orig_lna_short; // we're not altering this one
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uint8_t max_lna = orig_lna;
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uint8_t max_mixer = orig_mixer;
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uint8_t max_pga = orig_pga;
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if (rx_frequency <= 22640000) // the RX sensitivity abrutly drops above this frequency
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{
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max_pga = 7;
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}
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else
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{ // allow a bit more adjustment gain
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// max_lna = 4;
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max_lna = 7;
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max_pga = 7;
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}
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*/
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// sample the current RSSI level
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uint16_t rssi = BK4819_GetRSSI(); // 9-bit value (0 .. 511)
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//gCurrentRSSI = rssi - (rssi_db_gain_diff * 2);
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// compute the moving average RSSI
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if (moving_avg_rssi.count < ARRAY_SIZE(moving_avg_rssi.samples))
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moving_avg_rssi.count++;
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moving_avg_rssi.sum -= moving_avg_rssi.samples[moving_avg_rssi.index]; // subtract the oldest sample
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moving_avg_rssi.sum += rssi; // add the newest sample
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moving_avg_rssi.samples[moving_avg_rssi.index] = rssi; // save the newest sample
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if (++moving_avg_rssi.index >= ARRAY_SIZE(moving_avg_rssi.samples)) //
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moving_avg_rssi.index = 0; //
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rssi = moving_avg_rssi.sum / moving_avg_rssi.count; // compute the average of the past 'n' samples
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if (rssi > desired_rssi)
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{ // decrease gain
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if (am_fix_gain_table_index > 1)
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am_fix_gain_table_index--;
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am_gain_hold_counter = 50; // 500ms
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}
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if (am_gain_hold_counter > 0)
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am_gain_hold_counter--;
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if (am_gain_hold_counter == 0)
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{ // hold has been released, we're now free to increase gain
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if (rssi < (desired_rssi - 10)) // 5dB hysterisis (helps prevent gain hunting)
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{ // increase gain
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if (am_fix_gain_table_index < (ARRAY_SIZE(am_fix_gain_table) - 1))
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am_fix_gain_table_index++;
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}
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}
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if (am_fix_gain_table_index == am_fix_gain_table_index_prev)
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return; // no gain changes
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// apply the new gain settings to the front end
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// remember the new gain settings - for the next time this function is called
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const uint16_t lna_short = am_fix_gain_table[am_fix_gain_table_index].lna_short;
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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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BK4819_WriteRegister(BK4819_REG_13, (lna_short << 8) | (lna << 5) | (mixer << 3) | (pga << 0));
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{ // offset the RSSI reading to the rest of the firmware to cancel out the gain adjustments we've made here
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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];
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const int16_t am_dB_gain = lna_short_dB[lna_short & 3u] + lna_dB[lna & 7u] + mixer_dB[mixer & 3u] + pga_dB[pga & 7u];
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rssi_db_gain_diff = am_dB_gain - orig_dB_gain;
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}
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am_fix_gain_table_index_prev = am_fix_gain_table_index;
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#ifdef ENABLE_AM_FIX_SHOW_DATA
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gUpdateDisplay = true;
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#endif
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}
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#ifdef ENABLE_AM_FIX_SHOW_DATA
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void AM_fix_print_data(char *s)
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{
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if (s == NULL)
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return;
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const uint16_t lna_short = am_fix_gain_table[am_fix_gain_table_index].lna_short;
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|
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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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|
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const uint16_t pga = am_fix_gain_table[am_fix_gain_table_index].pga;
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const int16_t am_dB_gain = lna_short_dB[lna_short & 3u] + lna_dB[lna & 7u] + mixer_dB[mixer & 3u] + pga_dB[pga & 7u];
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#if 0
|
|
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|
|
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],
|
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|
|
|
pga_dB[pga & 7u],
|
|
|
|
|
am_dB_gain);
|
|
|
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|
#else
|
|
|
|
|
sprintf(s, "idx %2d gain %3ddB", am_fix_gain_table_index, am_dB_gain);
|
|
|
|
|
#endif
|
|
|
|
|
}
|
|
|
|
|
#endif
|
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|
#endif
|
