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--- rtes:topics:arm:timer [2017/10/18 03:20] – created admin
+++ rtes:topics:arm:timer [2017/10/18 03:50] (current) – [Links] admin
@@ Line 1: / Line 1: @@
 ====== ARM Timer/Counter ======
+===== Discussion on frequency measurements and frequency counts =====
 {{https://www.pjrc.com/teensy/td_libs_FreqCount_vs_FreqMeasure.png?600}}
@@ Line 5: / Line 7: @@
 Source: Paul Stoffregen, [[https://www.pjrc.com/teensy/td_libs_FreqMeasure.html#compare|FreqCount vs FreqMeasure]]
+Paul Stoffregen's libraries for Teensy and "standard" Arduinos (not M0):
+  * FreqCount Library:
+    * About: https://www.pjrc.com/teensy/td_libs_FreqCount.html
+    * Github: https://github.com/PaulStoffregen/FreqCount
+  * FreqMeasure Library:
+    * About: https://www.pjrc.com/teensy/td_libs_FreqMeasure.html
+    * Github: https://github.com/PaulStoffregen/FreqMeasure
+===== ARM vs. AVR Timer =====
+A good introduction on timer interrupts of AVR MCs is given by Amanda Ghassaei on Instructables: http://www.instructables.com/id/Arduino-Timer-Interrupts/
+The configuration of timers in ARM cortex M processors such as SAMD21 is somewhat more complex. The links below may help to understand the timer/counter configurations.
@@ Line 10: / Line 26: @@
   * Paul Stoffregen (Teensy, Freescale)
-    * FreqCount Library: https://www.pjrc.com/teensy/td_libs_FreqCount.html
+    * **FreqCount Library:**
-    * FreqMeasure Library: https://www.pjrc.com/teensy/td_libs_FreqMeasure.html
+      * About: https://www.pjrc.com/teensy/td_libs_FreqCount.html
+      * Github: https://github.com/PaulStoffregen/FreqCount
+    * **FreqMeasure Library:**
+      * About: https://www.pjrc.com/teensy/td_libs_FreqMeasure.html
+      * Github: https://github.com/PaulStoffregen/FreqMeasure
   * Max Bader (M0, zero): https://github.com/maxbader/arduino_tools
     * timer_m0_tc_counter
     * timer_m0_tc_interrupt
     * timer_m0_tcc_interrupt
   * Nonsintetic (M0, zero): https://gist.github.com/nonsintetic/
     * ArduinoZeroTimer
+  * Arduino Forum: [[https://forum.arduino.cc/index.php?topic=332275.0|Arduino ZERO Timer Interrupts]]