CPU Speed
Introduction
In the realm of microcontroller programming, optimizing CPU speed can significantly impact performance and power consumption. In this tutorial, we’ll delve into the process of adjusting the CPU speed on the ESP32 microcontroller. Understanding how to modify CPU speed opens doors to various applications, from conserving energy in battery-powered devices to maximizing processing power in computational tasks.
Need for Changing CPU Speed
Exploring why adjusting CPU speed is crucial provides context for this tutorial. We’ll discuss scenarios where altering CPU frequency becomes essential, such as:
- Power Management: Reducing CPU speed to conserve battery life in portable devices.
- Performance Optimization: Increasing CPU speed for time-sensitive tasks or computational-heavy operations.
Components
- ESP32 Development Board
- LED
- 220-ohm Resistor
- Breadboard
- Jumper Wires
- USB Cable
- Computer with Arduino IDE Installed
Circuit Diagram
Code
/*
acceptable frequencies >>> 240, 160, 80
setCpuFrequencyMhz(frequency);
*/
uint32_t cpuFrequency = 0;
uint32_t crystalFrequency = 0;
void setup()
{
Serial.begin(115200);
getFrequency();
setCpuFrequencyMhz(160);
getFrequency();
setCpuFrequencyMhz(80);
getFrequency();
}
void loop()
{
}
void getFrequency()
{
cpuFrequency = getCpuFrequencyMhz();
Serial.print(“CPU frequency = “);
Serial.print(cpuFrequency);
Serial.println(” MHz”);
crystalFrequency = getXtalFrequencyMhz();
Serial.print(“Crystal frequency = “);
Serial.print(crystalFrequency);
Serial.println(” MHz”);
}