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Argument_None_uS.ino
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/****************************************************************************************************************************
Argument_None_uS.ino
For SAMD boards
Written by Khoi Hoang
Built by Khoi Hoang https://github.com/khoih-prog/SAMD_TimerInterrupt
Licensed under MIT license
Now even you use all these new 16 ISR-based timers,with their maximum interval practically unlimited (limited only by
unsigned long miliseconds), you just consume only one SAMD timer and avoid conflicting with other cores' tasks.
The accuracy is nearly perfect compared to software timers. The most important feature is they're ISR-based timers
Therefore, their executions are not blocked by bad-behaving functions / tasks.
This important feature is absolutely necessary for mission-critical tasks.
Based on SimpleTimer - A timer library for Arduino.
Author: [email protected]
Copyright (c) 2010 OTTOTECNICA Italy
Based on BlynkTimer.h
Author: Volodymyr Shymanskyy
Version: 1.5.0
Version Modified By Date Comments
------- ----------- ---------- -----------
1.0.0 K Hoang 30/10/2020 Initial coding
1.0.1 K Hoang 06/11/2020 Add complicated example ISR_16_Timers_Array using all 16 independent ISR Timers.
1.1.1 K.Hoang 06/12/2020 Add Change_Interval example. Bump up version to sync with other TimerInterrupt Libraries
1.2.0 K.Hoang 08/01/2021 Add better debug feature. Optimize code and examples to reduce RAM usage
1.3.0 K.Hoang 02/04/2021 Add support to Sparkfun SAMD21 and SAMD51 boards
1.3.1 K.Hoang 09/05/2021 Fix compile error to some SAMD21-based boards
1.4.0 K.Hoang 02/06/2021 Fix SAMD21 rare bug caused by not fully init Prescaler
1.5.0 K.Hoang 08/10/2021 Improve frequency precision by using float instead of ulong
*****************************************************************************************************************************/
/*
Notes:
Special design is necessary to share data between interrupt code and the rest of your program.
Variables usually need to be "volatile" types. Volatile tells the compiler to avoid optimizations that assume
variable can not spontaneously change. Because your function may change variables while your program is using them,
the compiler needs this hint. But volatile alone is often not enough.
When accessing shared variables, usually interrupts must be disabled. Even with volatile,
if the interrupt changes a multi-byte variable between a sequence of instructions, it can be read incorrectly.
If your data is multiple variables, such as an array and a count, usually interrupts need to be disabled
or the entire sequence of your code which accesses the data.
*/
#if !( defined(ARDUINO_SAMD_ZERO) || defined(ARDUINO_SAMD_MKR1000) || defined(ARDUINO_SAMD_MKRWIFI1010) \
|| defined(ARDUINO_SAMD_NANO_33_IOT) || defined(ARDUINO_SAMD_MKRFox1200) || defined(ARDUINO_SAMD_MKRWAN1300) || defined(ARDUINO_SAMD_MKRWAN1310) \
|| defined(ARDUINO_SAMD_MKRGSM1400) || defined(ARDUINO_SAMD_MKRNB1500) || defined(ARDUINO_SAMD_MKRVIDOR4000) || defined(__SAMD21G18A__) \
|| defined(ARDUINO_SAMD_CIRCUITPLAYGROUND_EXPRESS) || defined(__SAMD21E18A__) || defined(__SAMD51__) || defined(__SAMD51J20A__) || defined(__SAMD51J19A__) \
|| defined(__SAMD51G19A__) || defined(__SAMD51P19A__) || defined(__SAMD21G18A__) )
#error This code is designed to run on SAMD21/SAMD51 platform! Please check your Tools->Board setting.
#endif
// These define's must be placed at the beginning before #include "SAMDTimerInterrupt.h"
// _TIMERINTERRUPT_LOGLEVEL_ from 0 to 4
// Don't define _TIMERINTERRUPT_LOGLEVEL_ > 0. Only for special ISR debugging only. Can hang the system.
// Don't define TIMER_INTERRUPT_DEBUG > 2. Only for special ISR debugging only. Can hang the system.
#define TIMER_INTERRUPT_DEBUG 0
#define _TIMERINTERRUPT_LOGLEVEL_ 0
#include "SAMDTimerInterrupt.h"
//#ifndef LED_BUILTIN
// #define LED_BUILTIN 13
//#endif
#ifndef LED_BLUE
#define LED_BLUE 2
#endif
#ifndef LED_RED
#define LED_RED 8
#endif
#define TIMER0_INTERVAL_MS 500 //1000
#define TIMER0_INTERVAL_US 200 //1000
volatile uint32_t preMillisTimer0 = 0;
// Depending on the board, you can select SAMD21 Hardware Timer from TC3-TCC
// SAMD21 Hardware Timer from TC3 or TCC
// SAMD51 Hardware Timer only TC3
// Init SAMD timer TIMER_TC3
SAMDTimer ITimer0(TIMER_TC3);
void TimerHandler0()
{
static bool toggle0 = false;
#if (TIMER_INTERRUPT_DEBUG > 0)
static uint32_t curMillis = 0;
curMillis = millis();
if (curMillis > TIMER0_INTERVAL_MS)
{
Serial.print(F("ITimer0: millis() = ")); Serial.print(curMillis);
Serial.print(F(", delta = ")); Serial.println(curMillis - preMillisTimer0);
}
preMillisTimer0 = curMillis;
#endif
//timer interrupt toggles pin LED_BUILTIN
digitalWrite(LED_BUILTIN, toggle0);
toggle0 = !toggle0;
}
#if (TIMER_INTERRUPT_USING_SAMD21)
#define TIMER1_INTERVAL_MS 2000
volatile uint32_t preMillisTimer1 = 0;
// Init SAMD timer TIMER_TCC
SAMDTimer ITimer1(TIMER_TCC);
void TimerHandler1()
{
static bool toggle1 = false;
#if (TIMER_INTERRUPT_DEBUG > 0)
static uint32_t curMillis = 0;
curMillis = millis();
if (curMillis > TIMER1_INTERVAL_MS)
{
Serial.print(F("ITimer1: millis() = ")); Serial.print(curMillis);
Serial.print(F(", delta = ")); Serial.println(curMillis - preMillisTimer1);
}
preMillisTimer0 = curMillis;
#endif
//timer interrupt toggles outputPin
digitalWrite(LED_BLUE, toggle1);
toggle1 = !toggle1;
}
#endif
void setup()
{
pinMode(LED_BUILTIN, OUTPUT);
pinMode(LED_BLUE, OUTPUT);
Serial.begin(115200);
while (!Serial);
delay(100);
Serial.print(F("\nStarting Argument_None_uS on ")); Serial.println(BOARD_NAME);
Serial.println(SAMD_TIMER_INTERRUPT_VERSION);
Serial.print(F("CPU Frequency = ")); Serial.print(F_CPU / 1000000); Serial.println(F(" MHz"));
// Interval in microsecs
//if (ITimer0.attachInterruptInterval(TIMER0_INTERVAL_MS * 1000, TimerHandler0))
if (ITimer0.attachInterruptInterval(TIMER0_INTERVAL_US, TimerHandler0))
{
preMillisTimer0 = millis();
Serial.print(F("Starting ITimer0 OK, millis() = ")); Serial.println(preMillisTimer0);
}
else
Serial.println(F("Can't set ITimer0. Select another freq. or timer"));
#if (TIMER_INTERRUPT_USING_SAMD21)
// Interval in microsecs
if (ITimer1.attachInterruptInterval(TIMER1_INTERVAL_MS * 1000, TimerHandler1))
{
preMillisTimer1 = millis();
Serial.print(F("Starting ITimer1 OK, millis() = ")); Serial.println(preMillisTimer1);
}
else
Serial.println(F("Can't set ITimer1. Select another freq. or timer"));
#endif
}
void loop()
{
}