# HG changeset patch
# User František Kučera <franta-hg@frantovo.cz>
# Date 1497179518 -7200
# Node ID 6b5c6a26693ffb12d885be06f282c1ee9b3186ed
# Parent 514b9b433dc293f854c790d273dfff3e8f9014a9
lpt-signal-generator: odsazení: mezery → tabulátory
diff -r 514b9b433dc2 -r 6b5c6a26693f c++/lpt-signal-generator/lpt.cpp
--- a/c++/lpt-signal-generator/lpt.cpp Sun Jun 11 13:07:53 2017 +0200
+++ b/c++/lpt-signal-generator/lpt.cpp Sun Jun 11 13:11:58 2017 +0200
@@ -51,121 +51,121 @@
* mode info: https://blog.frantovo.cz/c/358/Paraleln%C3%AD%20port%20jako%20gener%C3%A1tor%20sign%C3%A1lu
*/
int main() {
- //cout << "LPT!" << endl; // same as using printf → breaks all folllowing wprintf() calls, see note above
+ //cout << "LPT!" << endl; // same as using printf → breaks all folllowing wprintf() calls, see note above
- /*
- * if setlocale() is missing, unicode characters are replaced with ? or „→“ with „->“ because C/POSIX locale is used,
- * see man setlocale:
- * > On startup of the main program, the portable "C" locale is selected as default.
- * > If locale is an empty string, "", each part of the locale that should be modified is set according to the environment variables.
- */
- setlocale(LC_ALL,"");
+ /*
+ * if setlocale() is missing, unicode characters are replaced with ? or „→“ with „->“ because C/POSIX locale is used,
+ * see man setlocale:
+ * > On startup of the main program, the portable "C" locale is selected as default.
+ * > If locale is an empty string, "", each part of the locale that should be modified is set according to the environment variables.
+ */
+ setlocale(LC_ALL,"");
- // configuration ----
- int addr = 0xe400; // parallel port address; first number of given port in: cat /proc/ioports | grep parport
- int baseFreq = 10000; // base frequency in Hz, should be between 5 000 between 10 000 Hz; lower frequency leads to dashed/dotted lines instead of greyscale
- int outputPower = 20; // duty cycle; 100 = 100 %
- int duration = 1; // in seconds; total sleep time, see note above
- // ------------------
+ // configuration ----
+ int addr = 0xe400; // parallel port address; first number of given port in: cat /proc/ioports | grep parport
+ int baseFreq = 10000; // base frequency in Hz, should be between 5 000 between 10 000 Hz; lower frequency leads to dashed/dotted lines instead of greyscale
+ int outputPower = 20; // duty cycle; 100 = 100 %
+ int duration = 1; // in seconds; total sleep time, see note above
+ // ------------------
- int valueWidth = 10; // just for padding of printed values
- int labelWidth = -15; // just for padding of printed labels
+ int valueWidth = 10; // just for padding of printed values
+ int labelWidth = -15; // just for padding of printed labels
- // ' = thousand separator
- // * = padding
- wprintf(L"%*ls %*x\n", labelWidth, L"Parallel port:", valueWidth, addr); // or %#*x – adds 0x prefix
- wprintf(L"%*ls %'*d Hz\n", labelWidth, L"Base frequency:", valueWidth, baseFreq);
- wprintf(L"%*ls %*d %% duty cycle\n", labelWidth, L"Output power:", valueWidth, outputPower);
- wprintf(L"%*ls %'*d s\n", labelWidth, L"Duration:", valueWidth, duration);
+ // ' = thousand separator
+ // * = padding
+ wprintf(L"%*ls %*x\n", labelWidth, L"Parallel port:", valueWidth, addr); // or %#*x – adds 0x prefix
+ wprintf(L"%*ls %'*d Hz\n", labelWidth, L"Base frequency:", valueWidth, baseFreq);
+ wprintf(L"%*ls %*d %% duty cycle\n", labelWidth, L"Output power:", valueWidth, outputPower);
+ wprintf(L"%*ls %'*d s\n", labelWidth, L"Duration:", valueWidth, duration);
- // in microseconds:
- auto oneSecond = 1000 * 1000;
- auto timeOn = oneSecond * outputPower / 100 / baseFreq;
- auto timeOff = oneSecond * (100 - outputPower) / 100 / baseFreq;
+ // in microseconds:
+ auto oneSecond = 1000 * 1000;
+ auto timeOn = oneSecond * outputPower / 100 / baseFreq;
+ auto timeOff = oneSecond * (100 - outputPower) / 100 / baseFreq;
- auto cycleCount = duration * baseFreq;
- wprintf(L"%*ls %'*d ×\n", labelWidth, L"Cycle count:", valueWidth, cycleCount);
- wprintf(L"%*ls %'*d μs 1× in each cycle\n", labelWidth, L"Time on:", valueWidth, timeOn);
- wprintf(L"%*ls %'*d μs 1× in each cycle\n", labelWidth, L"Time off:", valueWidth, timeOff);
+ auto cycleCount = duration * baseFreq;
+ wprintf(L"%*ls %'*d ×\n", labelWidth, L"Cycle count:", valueWidth, cycleCount);
+ wprintf(L"%*ls %'*d μs 1× in each cycle\n", labelWidth, L"Time on:", valueWidth, timeOn);
+ wprintf(L"%*ls %'*d μs 1× in each cycle\n", labelWidth, L"Time off:", valueWidth, timeOff);
- //wprintf(L"%*ls %*ls\n", labelWidth, L"unicode test:", valueWidth, L"čeština → …");
+ //wprintf(L"%*ls %*ls\n", labelWidth, L"unicode test:", valueWidth, L"čeština → …");
- wprintf(L"\n");
+ wprintf(L"\n");
- // TODO: test whether this address is an parallel port
- if (ioperm(addr,1,1)) { fwprintf(stderr, L"Access denied to port %#x\n", addr), exit(1); }
+ // TODO: test whether this address is an parallel port
+ if (ioperm(addr,1,1)) { fwprintf(stderr, L"Access denied to port %#x\n", addr), exit(1); }
- // calibration
- auto startTimestamp = chrono::high_resolution_clock::now();
- auto calibrationCycles = 10000;
- auto calibrationSleepTime = 10;
+ // calibration
+ auto startTimestamp = chrono::high_resolution_clock::now();
+ auto calibrationCycles = 10000;
+ auto calibrationSleepTime = 10;
- for (auto i = calibrationCycles; i > 0; i--) {
- outb(0b00000000, addr);
- usleep(calibrationSleepTime);
- outb(0b00000000, addr);
- usleep(calibrationSleepTime);
- }
+ for (auto i = calibrationCycles; i > 0; i--) {
+ outb(0b00000000, addr);
+ usleep(calibrationSleepTime);
+ outb(0b00000000, addr);
+ usleep(calibrationSleepTime);
+ }
- auto finishTimestamp = chrono::high_resolution_clock::now();
- auto measuredDuration = chrono::duration_cast<chrono::nanoseconds>(finishTimestamp - startTimestamp).count();
+ auto finishTimestamp = chrono::high_resolution_clock::now();
+ auto measuredDuration = chrono::duration_cast<chrono::nanoseconds>(finishTimestamp - startTimestamp).count();
- auto singleOutbCostNano = (measuredDuration - calibrationCycles*2*calibrationSleepTime*1000)/calibrationCycles/2;
- auto singleOutbCostMicro = singleOutbCostNano/1000;
+ auto singleOutbCostNano = (measuredDuration - calibrationCycles*2*calibrationSleepTime*1000)/calibrationCycles/2;
+ auto singleOutbCostMicro = singleOutbCostNano/1000;
- wprintf(L"%*ls %'*d μs 2× in each calibration cycle\n", labelWidth, L"Single outb():", valueWidth, singleOutbCostMicro);
- wprintf(L"%*ls %'*d ns 2× in each calibration cycle\n", labelWidth, L"Single outb():", valueWidth, singleOutbCostNano);
+ wprintf(L"%*ls %'*d μs 2× in each calibration cycle\n", labelWidth, L"Single outb():", valueWidth, singleOutbCostMicro);
+ wprintf(L"%*ls %'*d ns 2× in each calibration cycle\n", labelWidth, L"Single outb():", valueWidth, singleOutbCostNano);
- auto minPower = 100*singleOutbCostNano/(1000*1000*1000/baseFreq);
- auto maxPower = 100-minPower;
- wprintf(L"%*ls %*d %% feasible duty cycle\n", labelWidth, L"Minimum power:", valueWidth, minPower);
- wprintf(L"%*ls %*d %% feasible duty cycle\n", labelWidth, L"Maximum power:", valueWidth, maxPower);
+ auto minPower = 100*singleOutbCostNano/(1000*1000*1000/baseFreq);
+ auto maxPower = 100-minPower;
+ wprintf(L"%*ls %*d %% feasible duty cycle\n", labelWidth, L"Minimum power:", valueWidth, minPower);
+ wprintf(L"%*ls %*d %% feasible duty cycle\n", labelWidth, L"Maximum power:", valueWidth, maxPower);
- if (singleOutbCostMicro < timeOn && singleOutbCostMicro < timeOff) {
- wprintf(L"%*ls %*ls both frequency and duty cycle should be correct\n", labelWidth, L"Calibration:", valueWidth, L"OK");
- timeOn -= singleOutbCostMicro;
- timeOff -= singleOutbCostMicro;
- } else if (2*singleOutbCostMicro < (timeOn + timeOff)) {
- wprintf(L"%*ls %*ls frequency should be OK, but duty cycle is not feasible\n", labelWidth, L"Calibration:", valueWidth, L"WARNING");
- timeOn -= singleOutbCostMicro;
- timeOff -= singleOutbCostMicro;
+ if (singleOutbCostMicro < timeOn && singleOutbCostMicro < timeOff) {
+ wprintf(L"%*ls %*ls both frequency and duty cycle should be correct\n", labelWidth, L"Calibration:", valueWidth, L"OK");
+ timeOn -= singleOutbCostMicro;
+ timeOff -= singleOutbCostMicro;
+ } else if (2*singleOutbCostMicro < (timeOn + timeOff)) {
+ wprintf(L"%*ls %*ls frequency should be OK, but duty cycle is not feasible\n", labelWidth, L"Calibration:", valueWidth, L"WARNING");
+ timeOn -= singleOutbCostMicro;
+ timeOff -= singleOutbCostMicro;
- if (timeOn < 0) {
- timeOff -= timeOn;
- timeOn = 0;
- } else {
- timeOn -= timeOff;
- timeOff = 0;
- }
- } else {
- wprintf(L"%*ls %*ls both frequency and duty cycle are not feasible\n", labelWidth, L"Calibration:", valueWidth, L"ERROR");
- timeOn = 0;
- timeOff = 0;
- }
+ if (timeOn < 0) {
+ timeOff -= timeOn;
+ timeOn = 0;
+ } else {
+ timeOn -= timeOff;
+ timeOff = 0;
+ }
+ } else {
+ wprintf(L"%*ls %*ls both frequency and duty cycle are not feasible\n", labelWidth, L"Calibration:", valueWidth, L"ERROR");
+ timeOn = 0;
+ timeOff = 0;
+ }
- wprintf(L"%*ls %'*d μs 1× in each cycle\n", labelWidth, L"Sleep on:", valueWidth, timeOn);
- wprintf(L"%*ls %'*d μs 1× in each cycle\n", labelWidth, L"Sleep off:", valueWidth, timeOff);
+ wprintf(L"%*ls %'*d μs 1× in each cycle\n", labelWidth, L"Sleep on:", valueWidth, timeOn);
+ wprintf(L"%*ls %'*d μs 1× in each cycle\n", labelWidth, L"Sleep off:", valueWidth, timeOff);
- wprintf(L"\n");
+ wprintf(L"\n");
- // actual signal generation
- startTimestamp = chrono::high_resolution_clock::now();
+ // actual signal generation
+ startTimestamp = chrono::high_resolution_clock::now();
- for (auto i = cycleCount; i > 0; i--) {
- outb(0b00000001, addr); // first data out pin = data out 0 = pin 2 on DB-25 connector
- usleep(timeOn);
- outb(0b00000000, addr);
- usleep(timeOff);
- }
+ for (auto i = cycleCount; i > 0; i--) {
+ outb(0b00000001, addr); // first data out pin = data out 0 = pin 2 on DB-25 connector
+ usleep(timeOn);
+ outb(0b00000000, addr);
+ usleep(timeOff);
+ }
- finishTimestamp = chrono::high_resolution_clock::now();
- measuredDuration = chrono::duration_cast<chrono::nanoseconds>(finishTimestamp - startTimestamp).count();
+ finishTimestamp = chrono::high_resolution_clock::now();
+ measuredDuration = chrono::duration_cast<chrono::nanoseconds>(finishTimestamp - startTimestamp).count();
- wprintf(L"%*ls %'*d μs in total\n", labelWidth, L"Deviation:", valueWidth, (measuredDuration-duration*oneSecond*1000)/1000);
- wprintf(L"%*ls %'*d ns in each cycle\n", labelWidth, L"Deviation:", valueWidth, (measuredDuration-duration*oneSecond*1000)/cycleCount);
+ wprintf(L"%*ls %'*d μs in total\n", labelWidth, L"Deviation:", valueWidth, (measuredDuration-duration*oneSecond*1000)/1000);
+ wprintf(L"%*ls %'*d ns in each cycle\n", labelWidth, L"Deviation:", valueWidth, (measuredDuration-duration*oneSecond*1000)/cycleCount);
}