b6be226e69
We can now directly compile arduino sketches (.pde) files. Arduino compatible analogWrite works now. But there is still a long way to go, serial I/O and timer stuff (delay, millis etc) currently don't work (not tested but I don't expect this to work). It can be used in an arduino sketch or in a normal contiki program. We get a PWM frequency of 490.2 Hz (a period of 2.040 ms), that's Arduino compatible. If you need different frequencies see native timer usage in examples/osd/pwm-example In a contiki program you have to call arduino_pwm_timer_init to initialize the timer before pwm works. The arduino sketch wrapper already does this. For running a sketch, see examples/osd/arduino-sketch
48 lines
1.4 KiB
Plaintext
48 lines
1.4 KiB
Plaintext
/*
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* Sample arduino sketch using contiki features.
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* We turn the LED on and off and allow setting the interval and the
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* brightness of the LED via coap.
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* Unfortunately sleeping for long times in loop() isn't currently
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* possible, something turns off the CPU (including PWM outputs) if a
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* Proto-Thread is taking too long. We need to find out how to sleep in
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* a Contiki-compatible way.
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* Note that for a normal arduino sketch you won't have to include any
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* of the contiki-specific files here, the sketch should just work.
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*/
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extern "C" {
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#include <stdio.h>
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#include "led_pwm.h"
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#define LED_PIN 5
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uint8_t pwm = 128;
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uint8_t period_100ms = 10; /* one second */
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}
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void setup (void)
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{
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rest_init_engine ();
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rest_activate_resource (&resource_led_pwm);
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rest_activate_resource (&resource_led_period);
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}
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void loop (void)
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{
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static uint8_t last_pwm = 0;
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if (last_pwm != pwm) {
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last_pwm = pwm;
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analogWrite (LED_PIN, pwm);
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printf
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( "TCNT3: %04X TCCR3A: %04X TCCR3B: %04X TCCR3C: %04X OCR3C: %04X\n"
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, TCNT3, TCCR3A, TCCR3B, TCCR3C, OCR3C
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);
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}
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// Originally I wanted to sleep here to make the LED blink.
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// Sleeping currently doesn't work, something turns off the chip.
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// Maybe a mechanism to guard agains proto-threads taking too long?
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//clock_wait (CLOCK_SECOND * period_100ms / 10);
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//analogWrite (LED_PIN, 0);
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//printf ("After write\n");
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}
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