102 lines
2.8 KiB
C++
102 lines
2.8 KiB
C++
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// Support routines for SAM processor boards
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#include "IRremote.h"
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#include "IRremoteInt.h"
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#if defined(ARDUINO_ARCH_SAM) || defined(ARDUINO_ARCH_SAMD)
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// "Idiot check"
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#ifdef USE_DEFAULT_ENABLE_IR_IN
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#error Must undef USE_DEFAULT_ENABLE_IR_IN
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#endif
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//+=============================================================================
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// ATSAMD Timer setup & IRQ functions
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//
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// following based on setup from GitHub jdneo/timerInterrupt.ino
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static void setTimerFrequency(int frequencyHz)
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{
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int compareValue = (SYSCLOCK / (TIMER_PRESCALER_DIV * frequencyHz)) - 1;
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//Serial.println(compareValue);
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TcCount16* TC = (TcCount16*) TC3;
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// Make sure the count is in a proportional position to where it was
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// to prevent any jitter or disconnect when changing the compare value.
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TC->COUNT.reg = map(TC->COUNT.reg, 0, TC->CC[0].reg, 0, compareValue);
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TC->CC[0].reg = compareValue;
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//Serial.print("COUNT.reg ");
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//Serial.println(TC->COUNT.reg);
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//Serial.print("CC[0].reg ");
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//Serial.println(TC->CC[0].reg);
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while (TC->STATUS.bit.SYNCBUSY == 1);
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}
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static void startTimer()
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{
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REG_GCLK_CLKCTRL = (uint16_t) (GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK0 | GCLK_CLKCTRL_ID_TCC2_TC3);
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while (GCLK->STATUS.bit.SYNCBUSY == 1); // wait for sync
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TcCount16* TC = (TcCount16*) TC3;
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TC->CTRLA.reg &= ~TC_CTRLA_ENABLE;
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while (TC->STATUS.bit.SYNCBUSY == 1); // wait for sync
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// Use the 16-bit timer
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TC->CTRLA.reg |= TC_CTRLA_MODE_COUNT16;
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while (TC->STATUS.bit.SYNCBUSY == 1); // wait for sync
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// Use match mode so that the timer counter resets when the count matches the compare register
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TC->CTRLA.reg |= TC_CTRLA_WAVEGEN_MFRQ;
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while (TC->STATUS.bit.SYNCBUSY == 1); // wait for sync
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// Set prescaler to 1024
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//TC->CTRLA.reg |= TC_CTRLA_PRESCALER_DIV1024;
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TC->CTRLA.reg |= TC_CTRLA_PRESCALER_DIV64;
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while (TC->STATUS.bit.SYNCBUSY == 1); // wait for sync
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setTimerFrequency(1000000 / USECPERTICK);
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// Enable the compare interrupt
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TC->INTENSET.reg = 0;
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TC->INTENSET.bit.MC0 = 1;
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NVIC_EnableIRQ(TC3_IRQn);
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TC->CTRLA.reg |= TC_CTRLA_ENABLE;
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while (TC->STATUS.bit.SYNCBUSY == 1); // wait for sync
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}
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//+=============================================================================
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// initialization
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//
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void IRrecv::enableIRIn()
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{
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// Interrupt Service Routine - Fires every 50uS
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//Serial.println("Starting timer");
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startTimer();
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//Serial.println("Started timer");
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// Initialize state machine variables
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irparams.rcvstate = STATE_IDLE;
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irparams.rawlen = 0;
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// Set pin modes
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pinMode(irparams.recvpin, INPUT);
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}
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void irs(); // Defined in IRRemote as ISR(TIMER_INTR_NAME)
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void TC3_Handler(void)
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{
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TcCount16* TC = (TcCount16*) TC3;
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// If this interrupt is due to the compare register matching the timer count
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// we toggle the LED.
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if (TC->INTFLAG.bit.MC0 == 1) {
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TC->INTFLAG.bit.MC0 = 1;
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irs();
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}
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}
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#endif // defined(ARDUINO_ARCH_SAM) || defined(ARDUINO_ARCH_SAMD)
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