初始化提交

2024-07-20 22:09:06 +08:00
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--- a/arduino-cli/libraries/PinChangeInterrupt/examples/PinChangeInterrupt_HowItWorks/PinChangeInterrupt_HowItWorks.ino
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+/*
+ Copyright (c) 2014-2015 NicoHood
+ See the readme for credit to other people.
+
+ PinChangeInterrupt_HowItWorks
+ Shows how to manually setup a single PCINT function with a few helper functions.
+
+ Connect a button/cable to pin 7 and ground.
+ The led will change its state if pin 7 changes.
+
+ PinChangeInterrupts are different than normal Interrupts.
+ See readme for more information.
+ Dont use Serial or delay inside interrupts!
+ This library is not compatible with SoftSerial.
+
+ The following pins are usable for PinChangeInterrupt:
+ Arduino Uno/Nano/Mini: All pins are usable
+ Arduino Mega: 10, 11, 12, 13, 50, 51, 52, 53, A8 (62), A9 (63), A10 (64),
+               A11 (65), A12 (66), A13 (67), A14 (68), A15 (69)
+ Arduino Leonardo/Micro: 8, 9, 10, 11, 14 (MISO), 15 (SCK), 16 (MOSI)
+ HoodLoader2: All (broken out 1-7) pins are usable
+ Attiny 24/44/84: All pins are usable
+ Attiny 25/45/85: All pins are usable
+ Attiny 13: All pins are usable
+ Attiny 441/841: All pins are usable
+ ATmega644P/ATmega1284P: All pins are usable
+ */
+
+//================================================================================
+// User Settings
+//================================================================================
+
+// choose a valid PinChangeInterrupt pin of your Arduino board
+#define PCINT_PIN 7
+#define PCINT_MODE CHANGE
+#define PCINT_FUNCTION blinkLed
+
+void setup()
+{
+  // set pins to input with a pullup, led to output
+  pinMode(PCINT_PIN, INPUT_PULLUP);
+  pinMode(LED_BUILTIN, OUTPUT);
+
+  // attach the new PinChangeInterrupt
+  attachPinChangeInterrupt();
+}
+
+void loop() {
+  // empty
+}
+
+void blinkLed(void) {
+  // switch Led state
+  digitalWrite(LED_BUILTIN, !digitalRead(LED_BUILTIN));
+}
+
+//================================================================================
+// PCINT Definitions
+//================================================================================
+
+#define PCMSK *digitalPinToPCMSK(PCINT_PIN)
+#define PCINT digitalPinToPCMSKbit(PCINT_PIN)
+#define PCIE  digitalPinToPCICRbit(PCINT_PIN)
+#define PCPIN *portInputRegister(digitalPinToPort(PCINT_PIN))
+
+#if (PCIE == 0)
+#define PCINT_vect PCINT0_vect
+#elif (PCIE == 1)
+#define PCINT_vect PCINT1_vect
+#elif (PCIE == 2)
+#define PCINT_vect PCINT2_vect
+#else
+#error This board doesnt support PCINT ?
+#endif
+
+volatile uint8_t oldPort = 0x00;
+
+void attachPinChangeInterrupt(void) {
+  // update the old state to the actual state
+  oldPort = PCPIN;
+
+  // pin change mask registers decide which pins are enabled as triggers
+  PCMSK |= (1 << PCINT);
+
+  // PCICR: Pin Change Interrupt Control Register - enables interrupt vectors
+  PCICR |= (1 << PCIE);
+}
+
+void detachPinChangeInterrupt(void) {
+  // disable the mask.
+  PCMSK &= ~(1 << PCINT);
+
+  // if that's the last one, disable the interrupt.
+  if (PCMSK == 0)
+    PCICR &= ~(0x01 << PCIE);
+}
+
+ISR(PCINT_vect) {
+  // get the new and old pin states for port
+  uint8_t newPort = PCPIN;
+
+  // compare with the old value to detect a rising or falling
+  uint8_t change = newPort ^ oldPort;
+
+  // check which pins are triggered, compared with the settings
+  uint8_t trigger = 0x00;
+#if (PCINT_MODE == RISING) || (PCINT_MODE == CHANGE)
+  uint8_t rising = change & newPort;
+  trigger |= (rising & (1 << PCINT));
+#endif
+#if (PCINT_MODE == FALLING) || (PCINT_MODE == CHANGE)
+  uint8_t falling = change & oldPort;
+  trigger |= (falling & (1 << PCINT));
+#endif
+
+  // save the new state for next comparison
+  oldPort = newPort;
+
+  // if our needed pin has changed, call the IRL interrupt function
+  if (trigger & (1 << PCINT))
+    PCINT_FUNCTION();
+}