maxim/gpio-reader
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

#305 measure single operation time and toggle time

Browse Source
This commit is contained in:
mstroh76
2025-01-10 18:58:09 +01:00
parent 1059d1b755
commit 7d37d158e0
1 changed files with 40 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

69
wiringPi/test/wiringpi_test7_bench.c
View File

@@ -11,22 +11,24 @@
int ToggleValue = 240000000;
float fExpectMHzdigitalWrite = 10;
float fExpectMHzpinMode = 4;
float fExpectTimedigitalWrite = 1/10;
float fExpectTimedigitalRead = 1/5;
float fExpectTimepinMode = 1/4;
float fWriteReadDelayFactor = 1.77;
int GPIO = 19;
int GPIOIN = 26;
int RaspberryPiModel = -1;
void ReportElaped(const char* msg, const float fExpectMHz, struct timeval t1, struct timeval t2) {
void ReportElapedTime(const char* msg, int multiop, const float fExpectTime, struct timeval t1, struct timeval t2) {
double elapsedTime, fTimePerOperation, fFreq;
elapsedTime = (t2.tv_sec-t1.tv_sec)+(t2.tv_usec-t1.tv_usec)/1000000.0;
fTimePerOperation = elapsedTime*1000000.0/ToggleValue;
fFreq = ToggleValue/elapsedTime/1000000.0;
printf(" % 9d toggle took %.3f s, Time per toggle %.3f us, Freq %.3f MHz \n",
fTimePerOperation = elapsedTime*1000000.0/ToggleValue/multiop;
fFreq = 1.0f/(fTimePerOperation*2); //ToggleValue/elapsedTime/1000000.0;
printf(" % 9d took %.3f s, Time per operation %.3f us (toggle Freq %.3f MHz) \n",
ToggleValue, elapsedTime, fTimePerOperation, fFreq);
CheckSameFloat(msg, fFreq, fExpectMHz, fExpectMHz*0.2f);
CheckSameFloat(msg, fTimePerOperation, fExpectTime, fExpectTime*0.2f);
}
@@ -53,14 +55,14 @@ int main (void) {
case PI_MODEL_AP:
case PI_MODEL_CM:
ToggleValue /= 7;
fExpectMHzdigitalWrite = 3.8; //MHz;
fExpectMHzpinMode = 1.5;
fExpectTimedigitalWrite = 1/(3.8*2); //MHz;
fExpectTimepinMode = 1/(1.5*2);
break;
case PI_MODEL_ZERO:
case PI_MODEL_ZERO_W: //ARM=1000MHz: 4.8/2.0
ToggleValue /= 5;
fExpectMHzdigitalWrite = 4.8; //MHz;
fExpectMHzpinMode = 2.0;
fExpectTimedigitalWrite = 1/(4.8*2); //MHz;
fExpectTimepinMode = 1/(2.0*2);
break;
case PI_MODEL_2:
ToggleValue /= 4;
@@ -78,16 +80,18 @@ int main (void) {
case PI_MODEL_CM4:
case PI_MODEL_CM4S:
ToggleValue = ToggleValue;
fExpectMHzdigitalWrite = 24.5; //MHz;
fExpectMHzpinMode = 4.1;
fExpectTimedigitalWrite = 1/(2*24.5); //MHz;
fExpectTimepinMode = 1/(2*4.1);
break;
case PI_MODEL_5:
ToggleValue = ToggleValue*0.8;
fExpectMHzdigitalWrite = 20.0; //MHz;
fExpectMHzpinMode = 2.5;
fExpectTimedigitalWrite = 1/(2*20.0); //MHz;
fExpectTimepinMode = 1/(2*2.5);
break;
}
fExpectTimedigitalRead = fExpectTimedigitalWrite*2;
printf("WiringPi GPIO speed test program (using GPIO %d) and toggle %d times\n", GPIO, ToggleValue);
@@ -95,40 +99,42 @@ int main (void) {
pinMode(GPIO, OUTPUT);
printf("write % 3d million times pin value ...\n", ToggleValue/1000000);
printf("% 3d million times digitalWrite ...\n", ToggleValue/1000000);
gettimeofday(&t1, NULL);
for (int loop=1; loop<ToggleValue; loop++) {
digitalWrite(GPIO, LOW);
digitalWrite(GPIO, HIGH);
digitalWrite(GPIO, LOW);
}
gettimeofday(&t2, NULL);
ReportElaped("GPIO digitalWrite max. frequency ", fExpectMHzdigitalWrite, t1, t2);
ReportElapedTime("digitalWrite", 2, fExpectTimedigitalWrite, t1, t2);
digitalWrite(GPIO, LOW);
pinMode(GPIO, INPUT);
pinMode(GPIOIN, INPUT);
ToggleValue /=2;
printf("\n");
printf("% 3d million times digitalRead ...\n", ToggleValue/1000000);
gettimeofday(&t1, NULL);
for (int loop=1; loop<ToggleValue; loop++) {
digitalRead(GPIOIN);
digitalRead(GPIOIN);
}
gettimeofday(&t2, NULL);
ReportElaped("GPIO digitalRead max. read ", fExpectMHzdigitalWrite, t1, t2);
ReportElapedTime("digitalRead", 2, fExpectTimedigitalRead, t1, t2);
ToggleValue /= 10;
ToggleValue /= 4;
printf("\n");
printf("toggle % 3d million times pin mode...\n", ToggleValue/1000000);
printf("% 3d million times pinMode...\n", ToggleValue/1000000);
gettimeofday(&t1, NULL);
for (int loop=1; loop<ToggleValue; loop++) {
pinMode(GPIO, OUTPUT);
pinMode(GPIO, INPUT);
pinMode(GPIOIN, INPUT);
}
gettimeofday(&t2, NULL);
ReportElaped("GPIO pinMode max. frequency ", fExpectMHzpinMode, t1, t2);
ReportElapedTime("pinMode", 2, fExpectTimepinMode, t1, t2);
printf("\n");
printf("toggle % 3d million times pin mode and digitalWrite ..\n", ToggleValue/1000000);
printf("Toggle % 3d million times pinMode and digitalWrite ..\n", ToggleValue/1000000);
gettimeofday(&t1, NULL);
for (int loop=1; loop<ToggleValue; loop++) {
pinMode(GPIO, OUTPUT);
@@ -137,19 +143,24 @@ int main (void) {
pinMode(GPIO, INPUT);
}
gettimeofday(&t2, NULL);
ReportElaped("GPIO pinMode max. frequency ", 1/(1/fExpectMHzpinMode+1/fExpectMHzdigitalWrite), t1, t2);
ReportElapedTime("pinMode and digitalWrite", 2, fExpectTimepinMode+fExpectTimedigitalWrite, t1, t2);
ToggleValue *= 3;
ToggleValue *= 1.5;
printf("\n");
pinMode(GPIO, OUTPUT);
printf("% 3d million times digitalRead and digitalWrite ..\n", ToggleValue/1000000);
printf("Toggle % 3d million times digitalRead and digitalWrite ..\n", ToggleValue/1000000);
gettimeofday(&t1, NULL);
for (int loop=1; loop<ToggleValue; loop++) {
digitalWrite(GPIO, HIGH);
digitalRead(GPIOIN);
digitalWrite(GPIO, LOW);
digitalRead(GPIOIN);
}
gettimeofday(&t2, NULL);
ReportElaped("GPIO pinMode max. frequency ", fExpectMHzdigitalWrite/2.6, t1, t2);
ReportElapedTime("digitalRead and digitalWrite", 2, fExpectTimedigitalWrite+fExpectTimedigitalRead*fWriteReadDelayFactor, t1, t2);
double elapsedTime = (t2.tv_sec-t1.tv_sec)+(t2.tv_usec-t1.tv_usec)/1000000.0;
double fTimePerOperation = elapsedTime*1000000.0/ToggleValue/2;
CheckSameFloat("Write <=> Read delay factor", fTimePerOperation/(fExpectTimedigitalWrite+fExpectTimedigitalRead), fWriteReadDelayFactor, 0.2);
digitalWrite(GPIO, LOW);
pinMode(GPIO, INPUT);