analogWriteFreq()

analogWriteFreq() sets the PWM frequency of the specified output channel.

uint16_t analogWriteFreq(uint8_t ch, uint32_t frequencyHz)

Commands

Command	Arguments	Return Value	Operation
`analogWriteFreq(ch, frequencyHz)`	`uint8_t ch` `uint32_t frequencyHz`	`uint16_t`	Sets the PWM frequency of the specified output channel.

Example

void setup() {
  analogWriteFreq(3, 1000);  // Set the PWM frequency of the specified output channel.
 
  uint16_t maxValue = analogWriteMax(3);  // Return the maximum value available for the specified output channel.
 
  analogWrite(3, maxValue / 4);  // D46 / OC5A, approx. 25%
  analogWrite(4, maxValue / 2);  // D45 / OC5B, approx. 50%
  analogWrite(5, maxValue);      // D44 / OC5C, 100%
}
 
void loop() {
}

Precautions

analogWrite(0~15, value) is for Y analog output, and analogWrite(20~31, value) is for K/K2 high-speed pulse output.
High-speed pulse GPIOs are K D130~D135 and K2 D130~D141, fixed regardless of the number of Y modules.
Analog output uses raw 0~65535 values; high-speed pulse output uses Arduino-compatible 0~255 values.
analogWriteInit(), analogWriteFreq() and analogWriteMax() are for Y analog output channels. Do not use them for high-speed pulses 20~31.
Do not use analogWrite(130~141, value).
The 3 channels belonging to the same timer share TOP, prescaler and frequency.
Calling analogWriteFreq() automatically changes TOP, so it also changes the maximum duty value for subsequent analogWrite() calls.
Use the return value of analogWriteFreq() or analogWriteMax() to check the current maximum duty value.
Check for timer conflicts when using these commands with other PWM, pulse or high-speed counter functions that use Timer1, Timer3, Timer4 or Timer5.
MPAINO analog output modules may require a separate power supply and DIP switch settings.
The actual voltage or current output range must match the module DIP switches, supply, wiring and input specifications of the connected equipment.

Built-in Commands in the Same Category

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ILOGICS Product Documentation

Table of Contents

analogWriteFreq()

Commands

Example

Precautions

Built-in Commands in the Same Category