232 lines
7.7 KiB
C
232 lines
7.7 KiB
C
// WiringPi test program: PWM test
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// Compile: gcc -Wall wiringpi_test9_pwm.c -o wiringpi_test9_pwm -lwiringPi
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#include "wpi_test.h"
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include <time.h>
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#include <stdint.h>
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int PWM_OUT[4] = { 18, 12, 13, 19 };
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int PWM_IN[4] = { 17, 13, 12, 26 };
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volatile int gCounter = 0;
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//Interrupt Service Routine for FREQIN
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void ISR_FREQIN(void) {
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gCounter++;
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}
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double MeasureAndCheckFreq(const char* msg, double expect_freq) {
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double fFrequency;
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clock_t CPUClockBegin, CPUClockEnd;
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int CountBegin, CountEnd;
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double CPUClockInterval, CountInterval;
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double elapsed_time, CPULoad;
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uint64_t tbegin, tend;
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int SleepMs = 1200;
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CPUClockBegin = clock();
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tbegin = piMicros64();
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CountBegin = gCounter;
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delay(SleepMs);
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CountEnd = gCounter;
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CPUClockEnd = clock();
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tend = piMicros64();
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elapsed_time = (double)(tend-tbegin)/1.0e6;
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CountInterval = CountEnd - CountBegin;
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CPUClockInterval = CPUClockEnd - CPUClockBegin;
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CPULoad = CPUClockInterval*100.0 / CLOCKS_PER_SEC / elapsed_time;
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fFrequency = CountInterval / elapsed_time / 1000;
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printf("\nInterval: time: %.6f sec (CPU: %3.1f %%), count: %g -> frequency: %.3f kHz\n",
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elapsed_time, CPULoad, CountInterval, fFrequency);
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CheckSameDouble("Wait for freq. meas.", elapsed_time, SleepMs/1000.0, 0.1); //100ms tolerance. maybe problematic on high freq/cpu load
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CheckSameDouble(msg, fFrequency, expect_freq, expect_freq*2/100); //2% toleranc
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return fFrequency;
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}
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int tests_pwmc[7] = {1456, 1000, 512, 200, 2000, 3000, 4000};
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int tests_duty[7] = { 512, 768, 682, 922, 256, 341, 102};
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int tests_pwmr[12]= { 50, 100, 200, 512, 1024, 1456, 2000, 3000, 5000, 10000, 15000, 20000};
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int tests_pwm[3] = { 50, 25, 75};
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int main (void) {
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int major, minor;
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char msg[255];
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int testruns = 4;
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int PWM, FREQIN;
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wiringPiVersion(&major, &minor);
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printf("WiringPi GPIO test program 9\n");
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printf("PWM/ISR test (WiringPi %d.%d)\n", major, minor);
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wiringPiSetupGpio() ;
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int rev, mem, maker, overVolted, RaspberryPiModel;
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piBoardId(&RaspberryPiModel, &rev, &mem, &maker, &overVolted);
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CheckNotSame("Model: ", RaspberryPiModel, -1);
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int Pi4 = 0;
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int Pi5 = 0;
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double MaxFreq = 100.0;
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switch(RaspberryPiModel) {
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case PI_MODEL_A:
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case PI_MODEL_B:
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case PI_MODEL_BP:
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case PI_MODEL_AP:
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case PI_MODEL_CM:
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MaxFreq = 5.0; // 4.8 kHz -> ~26% CPU@800 MHz
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printf(" - Pi1/BCM2835 detected, will skip tests with frequency above %g kHz\n", MaxFreq);
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break;
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case PI_MODEL_ZERO:
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case PI_MODEL_ZERO_W:
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MaxFreq = 13.0; // 12.5 kHz -> ~42% CPU@1000 MHz
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printf(" - PiZero/BCM2835 detected, will skip tests with frequency above %g kHz\n", MaxFreq);
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break;
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case PI_MODEL_2:
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MaxFreq = 20.0;
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printf(" - Pi2/BCM2836 detected, will skip tests with frequency above %g kHz\n", MaxFreq);
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break;
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case PI_MODEL_3B:
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case PI_MODEL_CM3:
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case PI_MODEL_3BP:
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case PI_MODEL_3AP:
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case PI_MODEL_CM3P:
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case PI_MODEL_ZERO_2W:
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MaxFreq = 50.0;
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printf(" - Pi3/BCM2837 detected, will skip tests with frequency above %g kHz\n", MaxFreq);
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break;
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case PI_MODEL_4B:
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case PI_MODEL_400:
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case PI_MODEL_CM4:
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case PI_MODEL_CM4S:
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Pi4 = 1;
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break;
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case PI_MODEL_5:
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case PI_MODEL_CM5:
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case PI_MODEL_500:
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case PI_MODEL_CM5L:
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Pi5 = 1;
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break;
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}
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if (!piBoard40Pin()) {
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testruns = 1; // only fist PWM0, supported
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}
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for (int testrun=0; testrun<testruns; testrun++) {
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PWM = PWM_OUT[testrun];
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FREQIN = PWM_IN[testrun];
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printf("using PWM@GPIO%d (output) and GPIO%d (input)\n", PWM, FREQIN);
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delay(1000);
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printf("\n");
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printf("*********************************\n");
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printf("* PWM BAL mode *\n");
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printf("*********************************\n");
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const int pmw = 512;
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int pmwr = 1024; //default!
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printf("Set pwm 50%% and enable PWM output (600 kHz?) \n");
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pwmWrite(PWM, pmw); //50% Duty
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pinMode(PWM, PWM_OUTPUT); //Mode BAL, pwmr=1024, pwmc=32
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printf("pwmc 4.8kHz\n");
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pwmSetClock(2000);
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delay(1000);
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printf("Register ISR@%d\n", PWM);
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// INT_EDGE_BOTH, INT_EDGE_FALLING, INT_EDGE_RISING only one ISR per input
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int result = wiringPiISR(FREQIN, INT_EDGE_RISING, &ISR_FREQIN);
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CheckSame("Register ISR", result, 0);
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if (result < 0) {
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printf("Unable to setup ISR for GPIO %d (%s)\n\n", FREQIN, strerror(errno));
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return UnitTestState();
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}
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printf("Wait for start ...\n");
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delay(500);
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printf("Start:\n");
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//MeasureAndCheckFreq("50\% Duty (default)", 300.000); //FAIL , freq (pwmc=32) to high for irq count
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if(!Pi5) {
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for (int c_duty=0, c_duty_end = sizeof(tests_duty)/sizeof(tests_duty[0]); c_duty<c_duty_end; c_duty++) {
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double tests_duty_corr;
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if (tests_duty[c_duty]>(pmwr/2)) {
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tests_duty_corr = pmwr-tests_duty[c_duty];
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} else {
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tests_duty_corr = tests_duty[c_duty];
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}
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double duty_fact = tests_duty_corr/(double)pmwr;
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printf("\n%d/%d set duty %d/%d\n",c_duty+1, c_duty_end, tests_duty[c_duty], pmwr);
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pwmWrite(PWM, tests_duty[c_duty]);
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for (int c_pwmc=0, end = sizeof(tests_pwmc)/sizeof(tests_pwmc[0]); c_pwmc<end; c_pwmc++) {
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int pwmc = tests_pwmc[c_pwmc];
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if (Pi4 && pwmc>1456) {
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printf("* Set clock (pwmc) %d not possible on BCM2711 system (OSC 54 MHz), ignore\n", pwmc);
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continue;
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}
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double freq = 19200.0/pwmc*duty_fact;
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if (freq>MaxFreq) {
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printf("* Set clock (pwmc) %d not possible on system (to slow to measure %g kHz with ISR), ignore\n", pwmc, freq);
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continue;
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}
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pwmSetClock(pwmc);
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delay(250);
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sprintf(msg, "Set Clock (pwmc) %d, %d%% duty", pwmc, tests_duty[c_duty]*100/pmwr);
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MeasureAndCheckFreq(msg, freq);
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}
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}
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}
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delay(250);
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printf("\n");
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printf("*********************************\n");
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printf("* PWM MS mode *\n");
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printf("*********************************\n");
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int pwmc = 10;
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printf("SetClock pwmc=%d and enable MS mode\n", pwmc);
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pwmSetClock(pwmc);
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pwmSetMode(PWM_MODE_MS);
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printf("Wait for start ...\n");
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delay(250);
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printf("Start:\n");
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for (int c_pmwr=0, c_pmwr_end = sizeof(tests_pwmr)/sizeof(tests_pwmr[0]); c_pmwr<c_pmwr_end; c_pmwr++) {
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int pwmr = tests_pwmr[c_pmwr];
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double freq = 19200.0/(double)pwmc/(double)pwmr;
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if (freq>MaxFreq) {
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printf("* Set Clock (pwmc, pwmr) %d, %d not possible on system (to slow to measure %g kHz with ISR), ignore\n", pwmc, pwmr, freq);
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continue;
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}
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sprintf(msg, "Set range (pwmr) %d", pwmr);
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pwmSetRange(pwmr);
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for (int c_pmw=0, c_pmw_end = sizeof(tests_pwm)/sizeof(tests_pwm[0]); c_pmw<c_pmw_end; c_pmw++) {
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int pwm = pwmr*tests_pwm[c_pmw]/100;
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sprintf(msg, "Set pwm %d/%d (%d %%)", pwm, pwmr, tests_pwm[c_pmw]);
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pwmWrite(PWM, pwm);
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delay(250);
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MeasureAndCheckFreq(msg, freq);
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}
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}
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result = wiringPiISRStop(FREQIN);
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CheckSame("\n\nRelease ISR", result, 0);
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if (result < 0) {
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printf("Unable to release ISR for GPIO %d (%s)\n\n", FREQIN, strerror(errno));
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return UnitTestState();
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}
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printf("set PWM@GPIO%d (output) back to input\n", PWM);
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pinMode(PWM, INPUT);
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}
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printf("\nDid %d PWM GPIO tests with model %d\n", testruns, RaspberryPiModel);
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return UnitTestState();
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}
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