Fix clockCyclesPerMicrosecond Change from fixed value to current value

[tanakamasayuki]

F_CPU is fixed at 240MHz.
In the case of other frequencies, the pulseIn function, etc. is not right.

Test

#define clockCyclesPerMicrosecondFix() ( (long int)getCpuFrequencyMhz() )
#define clockCyclesToMicrosecondsFix(a) ( (a) / clockCyclesPerMicrosecondFix() )
#define microsecondsToClockCyclesFix(a) ( (a) * clockCyclesPerMicrosecondFix() )

void setup() {
  Serial.begin(115200);
  delay(100);

  // It's OK
  setCpuFrequencyMhz(240);
  Serial.printf("clockCyclesPerMicrosecond() : %ld\n", clockCyclesPerMicrosecond() );
  Serial.printf("clockCyclesToMicroseconds(240) : %ld\n", clockCyclesToMicroseconds(240) );
  Serial.printf("microsecondsToClockCycles(1) : %ld\n\n", microsecondsToClockCycles(1) );

  // NG
  setCpuFrequencyMhz(160);
  Serial.printf("clockCyclesPerMicrosecond() : %ld\n", clockCyclesPerMicrosecond() );
  Serial.printf("clockCyclesToMicroseconds(160) : %ld\n", clockCyclesToMicroseconds(160) );
  Serial.printf("microsecondsToClockCycles(1) : %ld\n\n", microsecondsToClockCycles(1) );

  // Fix
  setCpuFrequencyMhz(240);
  Serial.printf("clockCyclesPerMicrosecondFix() : %ld\n", clockCyclesPerMicrosecondFix() );
  Serial.printf("clockCyclesToMicrosecondsFix(240) : %ld\n", clockCyclesToMicrosecondsFix(240) );
  Serial.printf("microsecondsToClockCyclesFix(1) : %ld\n\n", microsecondsToClockCyclesFix(1) );
  setCpuFrequencyMhz(160);
  Serial.printf("clockCyclesPerMicrosecondFix() : %ld\n", clockCyclesPerMicrosecondFix() );
  Serial.printf("clockCyclesToMicrosecondsFix(160) : %ld\n", clockCyclesToMicrosecondsFix(160) );
  Serial.printf("microsecondsToClockCyclesFix(1) : %ld\n\n", microsecondsToClockCyclesFix(1) );
  setCpuFrequencyMhz(80);
  Serial.printf("clockCyclesPerMicrosecondFix() : %ld\n", clockCyclesPerMicrosecondFix() );
  Serial.printf("clockCyclesToMicrosecondsFix(80) : %ld\n", clockCyclesToMicrosecondsFix(80) );
  Serial.printf("microsecondsToClockCyclesFix(1) : %ld\n\n", microsecondsToClockCyclesFix(1) );
  setCpuFrequencyMhz(40);
  Serial.printf("clockCyclesPerMicrosecondFix() : %ld\n", clockCyclesPerMicrosecondFix() );
  Serial.printf("clockCyclesToMicrosecondsFix(40) : %ld\n", clockCyclesToMicrosecondsFix(40) );
  Serial.printf("microsecondsToClockCyclesFix(1) : %ld\n\n", microsecondsToClockCyclesFix(1) );
  setCpuFrequencyMhz(20);
  Serial.printf("clockCyclesPerMicrosecondFix() : %ld\n", clockCyclesPerMicrosecondFix() );
  Serial.printf("clockCyclesToMicrosecondsFix(20) : %ld\n", clockCyclesToMicrosecondsFix(20) );
  Serial.printf("microsecondsToClockCyclesFix(1) : %ld\n\n", microsecondsToClockCyclesFix(1) );
  setCpuFrequencyMhz(10);
  Serial.printf("clockCyclesPerMicrosecondFix() : %ld\n", clockCyclesPerMicrosecondFix() );
  Serial.printf("clockCyclesToMicrosecondsFix(10) : %ld\n", clockCyclesToMicrosecondsFix(10) );
  Serial.printf("microsecondsToClockCyclesFix(1) : %ld\n\n", microsecondsToClockCyclesFix(1) );
}

void loop() {
}

output

clockCyclesPerMicrosecond() : 240
clockCyclesToMicroseconds(240) : 1
microsecondsToClockCycles(1) : 240

clockCyclesPerMicrosecond() : 240
clockCyclesToMicroseconds(160) : 0
microsecondsToClockCycles(1) : 240

clockCyclesPerMicrosecondFix() : 240
clockCyclesToMicrosecondsFix(240) : 1
microsecondsToClockCyclesFix(1) : 240

clockCyclesPerMicrosecondFix() : 160
clockCyclesToMicrosecondsFix(160) : 1
microsecondsToClockCyclesFix(1) : 160

clockCyclesPerMicrosecondFix() : 80
clockCyclesToMicrosecondsFix(80) : 1
microsecondsToClockCyclesFix(1) : 80

clockCyclesPerMicrosecondFix() : 40
clockCyclesToMicrosecondsFix(40) : 1
microsecondsToClockCyclesFix(1) : 40

clockCyclesPerMicrosecondFix() : 20
clockCyclesToMicrosecondsFix(20) : 1
microsecondsToClockCyclesFix(1) : 20

clockCyclesPerMicrosecondFix() : 10
clockCyclesToMicrosecondsFix(10) : 1
microsecondsToClockCyclesFix(1) : 10