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akira
3294c5e980
Revised various sections across multiple documentation files to reflect updated methods (`run_plc` replacing manual setup with `cycleloop`) and adjust for new default parameters (e.g., `autorefresh`). Enhanced descriptions for timers, Cycletools usage, and new method explanations. Removed outdated or redundant examples and updated system requirements. Signed-off-by: Sven Sager <akira@narux.de>
4.6 KiB
4.6 KiB
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Quick Start
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========== Quick Start ==========
This guide will help you write your first RevPiModIO program.
Basic Concepts
RevPiModIO provides two main programming paradigms:
- Cyclic Programming - Execute a function at regular intervals (PLC-style)
- Event-Driven Programming - Register callbacks triggered by hardware changes
Both approaches use the same core objects:
- rpi.io - Access inputs and outputs by name
- rpi.core - Control LEDs, watchdog, and system status
- rpi.device - Access specific hardware devices
Hardware Configuration
Before programming, configure your hardware using piCtory:
- Access piCtory web interface on your RevPi Core module
- Add and configure your I/O modules
- Assign symbolic names to inputs and outputs
- Example: button, led, temperature
- Good names make your code readable
- Save configuration and activate
Your First Program
Simple Input to Output
The simplest program reads an input and controls an output:
import revpimodio2 # Initialize with auto-refresh rpi = revpimodio2.RevPiModIO(autorefresh=True) # Read input and control output if rpi.io.button.value: rpi.io.led.value = True else: rpi.io.led.value = False # Clean up rpi.exit()
Cyclic Program
For continuous operation, use a cyclic loop:
import revpimodio2 def main_cycle(ct: revpimodio2.Cycletools): """Called every cycle (default: 20-50ms).""" if ct.first: # Initialize on first cycle ct.var.counter = 0 print("Program started") # Main logic if ct.io.button.value: ct.io.led.value = True else: ct.io.led.value = False # Count button presses if ct.changed(ct.io.button, edge=revpimodio2.RISING): ct.var.counter += 1 print(f"Button pressed {ct.var.counter} times") if ct.last: # Cleanup on exit print("Program stopped") # Run cyclic loop revpimodio2.run_plc(main_cycle)
Event-Driven Program
For event-based operation, use callbacks:
import revpimodio2 rpi = revpimodio2.RevPiModIO(autorefresh=True) def on_button_press(ioname, iovalue): """Called when button changes.""" print(f"Button is now: {iovalue}") rpi.io.led.value = iovalue # Register event callback rpi.io.button.reg_event(on_button_press) # Handle shutdown signals rpi.handlesignalend() # Start event loop rpi.mainloop()
LED Control
Control the RevPi status LEDs:
import revpimodio2 rpi = revpimodio2.RevPiModIO(autorefresh=True) # Set LED colors using constants rpi.core.A1 = revpimodio2.GREEN # Success rpi.core.A2 = revpimodio2.RED # Error rpi.core.A3 = revpimodio2.OFF # Off # Or control individual colors rpi.core.a1green.value = True rpi.core.a1red.value = False rpi.exit()
Common Patterns
Initialize and Cleanup
Always initialize variables and clean up resources:
def main_cycle(ct): if ct.first: # Initialize ct.var.state = "IDLE" ct.var.error_count = 0 # Main logic here... if ct.last: # Cleanup ct.io.motor.value = False print(f"Errors: {ct.var.error_count}")
Edge Detection
Detect rising or falling edges:
def main_cycle(ct): # Detect button press (rising edge) if ct.changed(ct.io.button, edge=revpimodio2.RISING): print("Button pressed!") # Detect button release (falling edge) if ct.changed(ct.io.button, edge=revpimodio2.FALLING): print("Button released!")
Timers
Use built-in cycle-based timers:
def main_cycle(ct): # On-delay: Input must be True for 10 cycles ct.set_tonc("startup", 10) if ct.get_tonc("startup"): ct.io.motor.value = True # Pulse: Generate 5-cycle pulse if ct.io.trigger.value: ct.set_tpc("pulse", 5) ct.io.pulse_output.value = ct.get_tpc("pulse")
Next Steps
:doc:`basics` - Core concepts and configuration
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:doc:`cyclic_programming` - Cyclic programming patterns
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:doc:`event_programming` - Event-driven programming patterns
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:doc:`advanced` - Advanced topics and best practices
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:doc:`api/index` - API reference
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