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Arduino-Development / libraries /Adafruit_Circuit_Playground /utility /IRLibSAMD21.h
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/* IRLibSAMD21.h
* Part of IRLib Library for Arduino receiving, decoding, and sending
* infrared signals. See COPYRIGHT.txt and LICENSE.txt for more information.
*
* This type of content is normally stored in IRLibHardware.h but we have
* moved at her because the SAMD21 support is significantly different than the
* AVR 8-bit hardware support. Separating it out into a separate file
* will make it easier to include comments and to maintain the code.
*/
/* This file provides hardware support for the SAMD21G18A processor or as we
* will refer to it simply as SAMD 21. This processor is used in the Arduino Zero,
* Arduino M0, Arduino M0 Pro, and the Adafruit Feather M0 series boards as well as
* the upcoming Adafruit Circuit Playground Express.
* Most of the code has been adapted from messages on the Arduino.cc support forum
* and from the code at:
* https://github.com/manitou48/ZERO/tree/master/IRtest
* Receiving is supported through all three receiver classes. As you would expect
* the IRrecvLoop class can be used with any available input pin. The IRrecvPCI and
* IRfrequency classes can be used on any pin that supports "attachInterrupt()".
* Specifically that means everything except pin 4 on the Arduino Zero. And everything
* except pin 2 on the boards from Arduino.org such as the Arduino M0, M0 Pro, and
* Zero Pro. For details on supported pins see these links:
* https://www.arduino.cc/en/Reference/AttachInterrupt
* http://www.arduino.org/learning/reference/AttachInterrupt
* Note that although we support Arduino.org hardware, you should only use the
* Arduino.cc IDE for compiling your sketches.
* Both sending and receiving use GCLK0 even though GCLK0-GCLK3 are generally reserved
* the Arduino infrastructure. However we are using the default 48 MHz clock source
* and a divisor of "1" so we aren't changing any of the GCLK0 set up. It's therefore
* safe to use.
* The IRrecv receiver class using a 50 microsecond timer interrupt is also supported.
* It defaults to using hardware timer TC3 however TC4 and TC5 can also be used in case
* of conflicts with other libraries. The IRrecv and IRrecvLoop classes should be able to use
* any available input pin. Note that all of our example sketches used pin 2 for
* receiver and pin 3 for frequency measurement. However pin 2 is not available for PCI
* interrupts on the Arduino.org platforms and neither 2 nor 3 are available on the
* Adafruit Feather M0 platforms. We are recommending using 5 and 6 for receiving and
* frequency measurement respectively.
* For sending, you can use any pin that supports PWM on your particular
* platform. On Arduino Zero that means pins 3, 4, 5, 6, 8, 9, 10, 11, 12, or 13.
* Additionally Arduino M0 Pro adds pins 2 and 7 to that list. In all cases the default
* output pin is 9. The code automatically selects TCC0 or TCC1 based on pin number
* as needed. It has been tested at frequencies of 36, 38, 39, 40 and 57 which
* are the frequencies of our supported protocols.
* As of this release the code has been tested on Arduino Zero, Arduino M0 Pro, and
* Adafruit Feather M0 BLE version.
*/
#ifndef IRLibSAMD21_h
#define IRLibSAMD21_h
/*
* This section contains user changeable values. You can probably stick with the defaults
* but if there are hardware conflicts with other libraries, you can change these values.
*/
//Choose PWM output pin number from among the following
//Un-comment only one of these.
//#define IR_SEND_PWM_PIN 2
//#define IR_SEND_PWM_PIN 3
//#define IR_SEND_PWM_PIN 4
//#define IR_SEND_PWM_PIN 5
//#define IR_SEND_PWM_PIN 6
//#define IR_SEND_PWM_PIN 7
//#define IR_SEND_PWM_PIN 8
//#define IR_SEND_PWM_PIN 9
//#define IR_SEND_PWM_PIN 10
//#define IR_SEND_PWM_PIN 11
#define IR_SEND_PWM_PIN 12
//#define IR_SEND_PWM_PIN 13
//Override default for Adafruit Circuit Playground Express
#ifdef ARDUINO_SAMD_CIRCUITPLAYGROUND_EXPRESS
#define IR_SEND_PWM_PIN 25
#endif
//Choose which timer counter to use for the 50 microsecond interrupt
//Un-comment only one of these.
#define IR_TCn 3
//#define IR_TCn 4
//#define IR_TCn 5
/*
* Everything below this point should not be changed. It computes needed defines
* based on the user set values above.
*/
// Saves us a lot of typing when synchronizing
#define syncTC while (IR_TCx->COUNT16.STATUS.bit.SYNCBUSY)
#define syncGCLK while (GCLK->STATUS.bit.SYNCBUSY)
#if defined(ARDUINO_SAMD_FEATHER_M0)
#if ( (IR_SEND_PWM_PIN<5) || (IR_SEND_PWM_PIN==7) || (IR_SEND_PWM_PIN==8) )
#error "Pin unsupported on Adafruit Feather M0"
#endif
#endif
//Pins 8 and 9 use TCC1 and all others use TCC0
#if ( (IR_SEND_PWM_PIN==8) || (IR_SEND_PWM_PIN==9) )
#define IR_TCCx TCC1
#else
#define IR_TCCx TCC0
#endif
//Although there are 8 WO there are only 4 CC
#define CC4 CC0
#define CC5 CC1
#define CC6 CC2
#define CC7 CC3
//Set other values based on pin number
#if (IR_SEND_PWM_PIN==2)
//NOTE: Arduino M0 Pro only
#if defined(ARDUINO_SAM_ZERO)
//PA08 E:TCC0-WO[0] F:TCC1-WO[2]
#define IR_MUX_EF PORT_PMUX_PMUXE_E
#define IR_CCx CC0
#define IR_CCn 0
#else
#error "Pin 2 only available on Arduino M0 Pro"
#endif
#elif (IR_SEND_PWM_PIN==3)
//PA09 E:TCC0-WO[1] F:TCC1-WO[3]
#define IR_MUX_EF PORT_PMUX_PMUXO_E
#define IR_CCx CC1
#define IR_CCn 1
#elif (IR_SEND_PWM_PIN==4)
//Arduino M0 Pro swaps pins 2 and 4
#if(ARDUINO_SAM_ZERO)
//Arduino M0 Pro
//PA09 E:TC3-WO[0] F:TCC0-WO[4]
#define IR_MUX_EF PORT_PMUX_PMUXE_F
#define IR_CCx CC4
#define IR_CCn 4
#else
//Arduino Zero
//PA08 E:TCC0-WO[0] F:TCC1-WO[2]
#define IR_MUX_EF PORT_PMUX_PMUXE_E
#define IR_CCx CC0
#define IR_CCn 0
#endif
#elif (IR_SEND_PWM_PIN==5)
//PA15 E:TC3-WO[1] F:TCC0-WO[5]
#define IR_MUX_EF PORT_PMUX_PMUXO_F
#define IR_CCx CC5
#define IR_CCn 5
#elif (IR_SEND_PWM_PIN==6)
//PA20 E:TC7-WO[0] F:TCC0-WO[6]
#define IR_MUX_EF PORT_PMUX_PMUXE_F
#define IR_CCx CC6
#define IR_CCn 6
#elif (IR_SEND_PWM_PIN==7)
//NOTE: Arduino M0 Pro only
#if defined(ARDUINO_SAM_ZERO)
//PA08 E:TC7-WO[1] F:TCC0-WO[7]
#define IR_MUX_EF PORT_PMUX_PMUXO_F
#define IR_CCx CC7
#define IR_CCn 7
#else
#error "Pin 7 only available on Arduino M0 Pro"
#endif
#elif (IR_SEND_PWM_PIN==8)
//PA06 E:TCC1-WO[0] F:--
#define IR_MUX_EF PORT_PMUX_PMUXE_E
#define IR_CCx CC0
#define IR_CCn 0
#elif (IR_SEND_PWM_PIN==9)
//PA07 E:TCC1-WO[1] F:--
#define IR_MUX_EF PORT_PMUX_PMUXO_E
#define IR_CCx CC1
#define IR_CCn 1
#elif (IR_SEND_PWM_PIN==10)
//PA18 E:TC3-WO[0] F:TCC0-WO[2]
#define IR_MUX_EF PORT_PMUX_PMUXE_F
#define IR_CCx CC2
#define IR_CCn 2
#elif (IR_SEND_PWM_PIN==11)
//PA16 E:TCC2-WO[0] F:TCC0-WO[6]
#define IR_MUX_EF PORT_PMUX_PMUXE_F
#define IR_CCx CC6
#define IR_CCn 6
#elif (IR_SEND_PWM_PIN==12)
//PA19 E:TC3-WO[1] F:TCC0-WO[3]
#define IR_MUX_EF PORT_PMUX_PMUXO_F
#define IR_CCx CC3
#define IR_CCn 3
#elif (IR_SEND_PWM_PIN==13)
//PA17 E:TCC2-WO[1] F:TCC0-WO[7]
#define IR_MUX_EF PORT_PMUX_PMUXO_F
#define IR_CCx CC7
#define IR_CCn 7
#elif (IR_SEND_PWM_PIN==25)//Adafruit Circuit Playground Express only
//PA23 E:TC4-WO[1] F:TCC0-WO[5]
#define IR_MUX_EF PORT_PMUX_PMUXO_F
#define IR_CCx CC5
#define IR_CCn 5
#else
#error "Invalid SAMD21 PWM pin"
#endif
// Turns PWM on and off after already set up
#define IR_SEND_PWM_START {IR_TCCx->CTRLA.reg |= TCC_CTRLA_ENABLE;\
while (IR_TCCx->SYNCBUSY.bit.ENABLE);}
#define IR_SEND_MARK_TIME(time) IRLibDelayUSecs(time)
#define IR_SEND_PWM_STOP {IR_TCCx->CTRLA.reg &= ~TCC_CTRLA_ENABLE;\
while (IR_TCCx->SYNCBUSY.bit.ENABLE);}
#define IR_SEND_CONFIG_KHZ(val) initializeSAMD21PWM(val);
/* These are the definitions for setting up the 50 microsecond
* timer interrupt for the IRrecv class.
*/
#if (IR_TCn==3)
#define IR_TCx TC3
#define IR_GCM GCM_TCC2_TC3
#define IR_RECV_INTR_NAME void TC3_Handler()
#define IR_IRQ TC3_IRQn
#elif (IR_TCn==4)
#define IR_TCx TC4
#define IR_GCM GCM_TC4_TC5
#define IR_RECV_INTR_NAME void TC4_Handler()
#define IR_IRQ TC4_IRQn
#elif (IR_TCn==5)
#define IR_TCx TC5
#define IR_GCM GCM_TC4_TC5
#define IR_RECV_INTR_NAME void TC5_Handler()
#define IR_IRQ TC5_IRQn
#else
#error "Invalid IR_TCn value"
#endif
#define IR_RECV_ENABLE_INTR ({NVIC_EnableIRQ(IR_IRQ);\
IR_TCx->COUNT16.INTENSET.reg = TC_INTENSET_OVF;\
IR_TCx->COUNT16.CTRLA.reg |= TC_CTRLA_ENABLE; syncTC;})
#define IR_RECV_DISABLE_INTR IR_TCx->COUNT16.INTENCLR.reg = TC_INTENCLR_OVF;
#define IR_RECV_CONFIG_TICKS() initializeSAMD21timerInterrupt()
//Clear interrupt
#define IR_CLEAR_INTERRUPT IR_TCx->COUNT16.INTFLAG.bit.MC0 = 1;
//prototypes
void initializeSAMD21PWM(uint16_t khz);
void initializeSAMD21timerInterrupt(void);
#endif //IRLibSAMD21_h