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Diffstat (limited to 'docs/source/timers.rst')
| -rw-r--r-- | docs/source/timers.rst | 30 |
1 files changed, 17 insertions, 13 deletions
diff --git a/docs/source/timers.rst b/docs/source/timers.rst index e0e57cb..948805b 100644 --- a/docs/source/timers.rst +++ b/docs/source/timers.rst @@ -2,9 +2,8 @@ .. _timers: -======== - Timers -======== +Timers +====== There are four general purpose timers in the Maple microcontroller that can be configured to generate periodic or delayed events with @@ -32,6 +31,8 @@ counter to reset to zero more frequently. Caveats ------- +.. _timers-pwm-conflicts: + **PWM Conflicts:** Because PWM functionality on a given pin depends on the configuration of the timer and channel, you must chose your channels carefully if you want to use both timer interrupts and PWM in @@ -50,7 +51,7 @@ configuration being the same. **Jitter:** other interrupts (USB, Serial, SysTick, or other timers) can and will get called before or during the timer - interrupt routines, causing pseudo-random delays and other + interrupt routines, causing pseudorandom delays and other frustrations. Disabling the USB port (by calling ``SerialUSB.end()``, or just @@ -88,7 +89,7 @@ General Timer Modes :ref:`PWM docs <pwm>` for more information on this mode. .. note:: - + ``Timer1.setChannel1Mode(TIMER_PWM)`` may not work as expected; if you want PWM functionality on a channel, make sure you don't set it to something else. @@ -196,6 +197,9 @@ from 1 to 4. Note that function call overhead means that the smallest increment rate is a couple microseconds. +.. _timers-attachinterrupt: +.. _timers-detachinterrupt: + ``Timer1.attachCompare1Interrupt(function)``/\ ``Timer1.detachCompare1Interrupt()`` This is how to attach or disable an interrupt handlers to timer @@ -235,7 +239,7 @@ LED blink void setup() { - // Set up the LED to blink + // Set up the LED to blink pinMode(LED_PIN, OUTPUT); // Setup Timer @@ -246,13 +250,13 @@ LED blink } void loop() { - // Nothing! It's all in the interrupts + // Nothing! It's all in the interrupts } void handler_led(void) { toggle ^= 1; digitalWrite(LED_PIN, toggle); - } + } Racing Counters ^^^^^^^^^^^^^^^ @@ -282,7 +286,7 @@ Racing Counters Timer3.setOverflow(30000); Timer4.setOverflow(30000); Timer3.setCompare1(1000); // somewhere in the middle - Timer4.setCompare1(1000); + Timer4.setCompare1(1000); Timer3.attachCompare1Interrupt(handler1); Timer4.attachCompare1Interrupt(handler2); Timer3.resume(); @@ -291,9 +295,9 @@ Racing Counters void loop() { // Display the running counts - SerialUSB.print("Count 1: "); + SerialUSB.print("Count 1: "); SerialUSB.print(count1); - SerialUSB.print("\t\tCount 2: "); + SerialUSB.print("\t\tCount 2: "); SerialUSB.println(count2); // Run... while BUT is held, pause Count2 @@ -309,7 +313,7 @@ Racing Counters void handler1(void) { count1++; - } + } void handler2(void) { count2++; - } + } |