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Fix some case where adaptive_range_gain_limit would not be correctly decreased

This commit is contained in:
Oliver Jowett 2021-07-15 16:43:02 +08:00
parent 9e671a14e4
commit e0f7a33df4
1 changed files with 12 additions and 5 deletions
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17
adaptive.c
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@ -464,10 +464,11 @@ static void adaptive_control_update()
if (Modes.adaptive_range_control && !adaptive_range_change_timer) {
float available_range = -20 * log10(adaptive_range_smoothed / 65536.0);
// allow the gain limit to increase if this gain setting is acceptable
// (decreasing the limit is done separately in SCAN_UP / IDLE states when we decide to reduce gain)
if (available_range >= Modes.adaptive_range_target && current_gain > adaptive_range_gain_limit)
// (decreasing the limit is done separately depending on the current state as we make slightly different decisions in IDLE
// to provide hysteresis)
if (available_range >= Modes.adaptive_range_target && current_gain > adaptive_range_gain_limit) {
adaptive_range_gain_limit = current_gain;
}
switch (adaptive_range_state) {
case RANGE_SCAN_UP:
if (available_range < Modes.adaptive_range_target) {
@ -476,8 +477,9 @@ static void adaptive_control_update()
gain_down = gain_not_up = true;
gain_down_reason = "probing dynamic range gain lower bound";
adaptive_range_state = RANGE_SCAN_DOWN;
if (adaptive_range_gain_limit >= current_gain)
if (adaptive_range_gain_limit >= current_gain) {
adaptive_range_gain_limit = current_gain - 1;
}
break;
}
@ -507,6 +509,10 @@ static void adaptive_control_update()
break;
}
if (adaptive_range_gain_limit >= current_gain) {
adaptive_range_gain_limit = current_gain - 1;
}
if (sdrGetGain() <= adaptive_gain_min) {
fprintf(stderr, "adaptive: reached lower gain limit, halting dynamic range scan here\n");
adaptive_range_state = RANGE_SCAN_IDLE;
@ -526,8 +532,9 @@ static void adaptive_control_update()
if (available_range + adaptive_gain_down_db / 2 < Modes.adaptive_range_target && sdrGetGain() > adaptive_gain_min) {
fprintf(stderr, "adaptive: available dynamic range (%.1fdB) + half gain step down (%.1fdB) < required dynamic range (%.1fdB), starting downward scan\n",
available_range, Modes.adaptive_range_target, adaptive_gain_down_db);
if (current_gain >= adaptive_range_gain_limit)
if (adaptive_range_gain_limit >= current_gain) {
adaptive_range_gain_limit = current_gain - 1;
}
adaptive_range_state = RANGE_SCAN_DOWN;
gain_down = gain_not_up = true;
gain_down_reason = "dynamic range fell below target value";