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optimize the dcf encoder

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This commit is contained in:
KubaPro010
2025-03-28 13:17:33 +01:00
parent 983f7b4288
commit 57fbf5630c
2 changed files with 44 additions and 52 deletions
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2
.vscode/.server-controller-port.log vendored
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@@ -1,5 +1,5 @@
{ {
"port": 13452, "port": 13452,
"time": 1743094558477, "time": 1743162622776,
"version": "0.0.3" "version": "0.0.3"
} }

94
src/dcf95.c
View File

@@ -128,51 +128,46 @@ void calculate_dcf77_bits(time_t now, int *bits) {
memset(bits, 0, 60 * sizeof(int)); memset(bits, 0, 60 * sizeof(int));
bits[16] = is_timezone_change_soon(); bits[16] = is_timezone_change_soon();
if(cest) { bits[17] = cest;
bits[17] = 1; bits[18] = !cest;
} else {
bits[18] = 1;
}
bits[20] = 1; bits[20] = 1;
int minutes = t->tm_min; int minutes = t->tm_min;
bits[21] = (minutes % 10) & 0x01; for (int i = 0; i < 4; i++) {
bits[22] = ((minutes % 10) >> 1) & 0x01; bits[21 + i] = (minutes % 10 >> i) & 1;
bits[23] = ((minutes % 10) >> 2) & 0x01; }
bits[24] = ((minutes % 10) >> 3) & 0x01; for (int i = 0; i < 3; i++) {
bits[25] = ((minutes / 10) & 0x01); bits[25 + i] = (minutes / 10 >> i) & 1;
bits[26] = ((minutes / 10) >> 1) & 0x01; }
bits[27] = ((minutes / 10) >> 2) & 0x01;
int parity = 0; int minute_parity = 0;
for (int i = 21; i <= 27; i++) { for (int i = 21; i <= 27; i++) {
parity ^= bits[i]; minute_parity ^= bits[i];
} }
bits[28] = parity; bits[28] = minute_parity;
int hours = t->tm_hour-1; int hours = t->tm_hour;
hours += 1;
if(cest) hours += 1; if(cest) hours += 1;
bits[29] = (hours % 10) & 0x01; for (int i = 0; i < 4; i++) {
bits[30] = ((hours % 10) >> 1) & 0x01; bits[29 + i] = (hours % 10 >> i) & 1;
bits[31] = ((hours % 10) >> 2) & 0x01; }
bits[32] = ((hours % 10) >> 3) & 0x01; for (int i = 0; i < 2; i++) {
bits[33] = ((hours / 10) & 0x01); bits[33 + i] = (hours / 10 >> i) & 1;
bits[34] = ((hours / 10) >> 1) & 0x01; }
parity = 0; int hour_parity = 0;
for (int i = 29; i <= 34; i++) { for (int i = 29; i <= 34; i++) {
parity ^= bits[i]; hour_parity ^= bits[i];
} }
bits[35] = parity; bits[35] = hour_parity;
int day = t->tm_mday; int day = t->tm_mday;
bits[36] = (day % 10) & 0x01; for (int i = 0; i < 4; i++) {
bits[37] = ((day % 10) >> 1) & 0x01; bits[36 + i] = (day % 10 >> i) & 1;
bits[38] = ((day % 10) >> 2) & 0x01; }
bits[39] = ((day % 10) >> 3) & 0x01; for (int i = 0; i < 2; i++) {
bits[40] = ((day / 10) & 0x01); bits[40 + i] = (day / 10 >> i) & 1;
bits[41] = ((day / 10) >> 1) & 0x01; }
int dow = t->tm_wday == 0 ? 7 : t->tm_wday; int dow = t->tm_wday == 0 ? 7 : t->tm_wday;
bits[42] = dow & 0x01; bits[42] = dow & 0x01;
@@ -180,27 +175,24 @@ void calculate_dcf77_bits(time_t now, int *bits) {
bits[44] = (dow >> 2) & 0x01; bits[44] = (dow >> 2) & 0x01;
int month = t->tm_mon + 1; int month = t->tm_mon + 1;
bits[45] = (month % 10) & 0x01; for (int i = 0; i < 4; i++) {
bits[46] = ((month % 10) >> 1) & 0x01; bits[45 + i] = (month % 10 >> i) & 1;
bits[47] = ((month % 10) >> 2) & 0x01; }
bits[48] = ((month % 10) >> 3) & 0x01;
bits[49] = (month / 10) & 0x01; bits[49] = (month / 10) & 0x01;
int year = t->tm_year % 100; int year = t->tm_year % 100;
bits[50] = (year % 10) & 0x01; for (int i = 0; i < 4; i++) {
bits[51] = ((year % 10) >> 1) & 0x01; bits[50 + i] = (month % year >> i) & 1;
bits[52] = ((year % 10) >> 2) & 0x01; }
bits[53] = ((year % 10) >> 3) & 0x01; for (int i = 0; i < 4; i++) {
bits[54] = ((year / 10) & 0x01); bits[54 + i] = (year / 10 >> i) & 1;
bits[55] = ((year / 10) >> 1) & 0x01; }
bits[56] = ((year / 10) >> 2) & 0x01;
bits[57] = ((year / 10) >> 3) & 0x01;
parity = 0; int hour_parity = 0;
for (int i = 36; i <= 57; i++) { for (int i = 36; i <= 57; i++) {
parity ^= bits[i]; hour_parity ^= bits[i];
} }
bits[58] = parity; bits[58] = hour_parity;
bits[59] = 2; bits[59] = 2;
} }