ttrftech/NanoVNA
1
0
Fork 0
mirror of https://github.com/ttrftech/NanoVNA.git synced 2025-12-06 03:31:59 +01:00
Code Issues Actions Packages Projects Releases Wiki Activity

fix: boundary check of center/span

Browse source
This commit is contained in:
TT 2020-01-18 14:25:37 +09:00
parent e1ba0c77f0
commit c4edbee973
1 changed files with 22 additions and 17 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

39
main.c
View file

@ -846,44 +846,49 @@ set_sweep_frequency(int type, uint32_t freq)
}
break;
case ST_CENTER:
ensure_edit_config();
if (freq < START_MIN)
freq = START_MIN;
if (freq > STOP_MAX)
freq = STOP_MAX;
freq_mode_centerspan();
uint32_t center = frequency0/2 + frequency1/2;
if (center != freq) {
uint32_t span = frequency0 - frequency1;
ensure_edit_config();
if (freq < START_MIN + span/2) {
span = (freq - START_MIN) * 2;
}
if (freq > STOP_MAX - span/2) {
span = (STOP_MAX - freq) * 2;
}
frequency0 = freq + span/2;
frequency1 = freq - span/2;
if (frequency1 < START_MIN) {
frequency0 -= START_MIN - frequency1;
frequency1 = START_MIN;
}
if (frequency0 > STOP_MAX) {
frequency1 += frequency0 - STOP_MAX;
frequency0 = STOP_MAX;
}
update_frequencies();
}
break;
case ST_SPAN:
if (freq > STOP_MAX)
freq = STOP_MAX;
freq_mode_centerspan();
if (frequency0 - frequency1 != freq) {
ensure_edit_config();
uint32_t center = frequency0/2 + frequency1/2;
if (center < START_MIN + freq/2) {
center = START_MIN + freq/2;
}
if (center > STOP_MAX - freq/2) {
center = STOP_MAX - freq/2;
}
frequency1 = center - freq/2;
frequency0 = center + freq/2;
if (frequency1 < START_MIN) {
frequency0 -= START_MIN - frequency1;
frequency1 = START_MIN;
}
if (frequency0 > STOP_MAX) {
frequency1 += frequency0 - STOP_MAX;
frequency0 = STOP_MAX;
}
update_frequencies();
}
break;
case ST_CW:
if (freq < START_MIN)
freq = START_MIN;
if (freq > STOP_MAX)
freq = STOP_MAX;
freq_mode_centerspan();
if (frequency0 != freq || frequency1 != freq) {
ensure_edit_config();