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minor performance tweaks

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This commit is contained in:
Asbelos 2021-02-04 10:45:45 +00:00
parent 653c421400
commit f796f23d7b
2 changed files with 7 additions and 3 deletions
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8
DCCWaveform.cpp
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@ -17,6 +17,7 @@
* You should have received a copy of the GNU General Public License
* along with CommandStation. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma GCC optimize ("-O3")
#include <Arduino.h>
#include "DCCWaveform.h"
@ -198,7 +199,10 @@ void DCCWaveform::interrupt2() {
}
else if (packetPending) {
// Copy pending packet to transmit packet
for (int b = 0; b < pendingLength; b++) transmitPacket[b] = pendingPacket[b];
// a fixed length memcpy is faster than a variable length loop for these small lengths
// for (int b = 0; b < pendingLength; b++) transmitPacket[b] = pendingPacket[b];
memcpy( transmitPacket, pendingPacket, sizeof(pendingPacket));
transmitLength = pendingLength;
transmitRepeats = pendingRepeats;
packetPending = false;
@ -223,7 +227,7 @@ void DCCWaveform::schedulePacket(const byte buffer[], byte byteCount, byte repea
while (packetPending);
byte checksum = 0;
for (int b = 0; b < byteCount; b++) {
for (byte b = 0; b < byteCount; b++) {
checksum ^= buffer[b];
pendingPacket[b] = buffer[b];
}

2
DCCWaveform.h
View File

@ -29,7 +29,7 @@ const int POWER_SAMPLE_OVERLOAD_WAIT = 20;
// Number of preamble bits.
const int PREAMBLE_BITS_MAIN = 16;
const int PREAMBLE_BITS_PROG = 22;
const byte MAX_PACKET_SIZE = 12;
const byte MAX_PACKET_SIZE = 5; // NMRA standard exrtended packets
// The WAVE_STATE enum is deliberately numbered because a change of order would be catastrophic
// to the transform array.