77c02d58f8
Now the necessary settings are in adc.h. Refactored to allow repeated ADC reads without reinitialization. Arduino allows setting analogReference, this is now also implemented. ADC is now initialized to sane values in apps/arduino/arduino-process.c dev/arduino/arduino-compat.h now has all hardware independent settings for arduino (some moved from platform/osd-merkur/dev/hw-arduino.h). turnOffPWM re-implemented with hw_timer, removed from wiring_digital.c ADC-specific arduino stuff moved to arduino-compat.h Arduinos wiring_analog no longer necessary. arduino-sketch example now reads analog inputs 1 and 5 using analogRead.
196 lines
7.1 KiB
C
196 lines
7.1 KiB
C
/*
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* Copyright (c) 2014, Ralf Schlatterbeck Open Source Consulting
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*/
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/**
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* \defgroup Hardware independent Arduino compatibility
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*
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* This file is meant to be included into a compatible Arduino.h
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*
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* Arduino calls the combination of an AVR timer and the corresponding
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* channel a timer. So Arduinos definition of timer is different from
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* that of AVR documentation. Arduino defines arbitrary TIMERXX macros
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* that are later parsed in a big switch statement.
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*
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* We use a better representation of timer values than arduino here:
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* The AVRs have max. 6 (numbered 0-5) timers. For representing these we
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* need 3 bits. In addition each timer can have channels A-D (or just
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* one channel in which case there is no alphabetic suffix). We can
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* represent this in 2 bits. We add one bit to each for future
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* compatibility and come up with 7 bits, still easily represented in 8
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* bit with room for a 'NOT_ON_TIMER' value. From these we can easily
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* compute the channel and timer by shifting. No need for a big switch
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* statement, and -- which is the common case -- when initializing with
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* a constant for the pin, the compiler can compute everything at
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* compile-time (that's why the analogWrite below is implemented as a
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* static inline function).
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*
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* Note that Arduino also defines some TIMERX without an alphabetic
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* suffix (e.g. TIMER2). I suspect this is for microcontrollers that
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* only have one channel for a certain timer. So this is currently
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* defined the same as TIMER2A because they are never used together.
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* This may be wrong and may be a bug.
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*
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* Note that the hardware definition still has to define a
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* digitalPinToTimer macro. We suggest to not implement this with a
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* static table in program memory (as currently done by arduino) but
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* instead as an if-cascade (as a C-macro). This allows the compiler to
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* completely compute the if-cascade at compile-time if the used pin is
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* a constant, resulting in *much* smaller code-footprint in the most
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* common use-case.
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*
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* @{
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*/
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/**
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* \file
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* Header file for arduino compatibility
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* \author
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* Ralf Schlatterbeck <rsc@runtux.com>
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*
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*/
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/* To be included by a compatible Arduino.h */
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "contiki.h"
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#include "hw_timer.h"
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#include "adc.h"
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#define HW_TIMER_SHIFT 3
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#define NOT_ON_TIMER 0xFF
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#define TIMER0A ((0 << HW_TIMER_SHIFT) | HWT_CHANNEL_A)
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#define TIMER0B ((0 << HW_TIMER_SHIFT) | HWT_CHANNEL_B)
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#define TIMER1A ((1 << HW_TIMER_SHIFT) | HWT_CHANNEL_A)
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#define TIMER1B ((1 << HW_TIMER_SHIFT) | HWT_CHANNEL_B)
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#define TIMER1C ((1 << HW_TIMER_SHIFT) | HWT_CHANNEL_C)
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#define TIMER2 ((2 << HW_TIMER_SHIFT) | HWT_CHANNEL_A)
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#define TIMER2A ((2 << HW_TIMER_SHIFT) | HWT_CHANNEL_A)
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#define TIMER2B ((2 << HW_TIMER_SHIFT) | HWT_CHANNEL_B)
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#define TIMER3A ((3 << HW_TIMER_SHIFT) | HWT_CHANNEL_A)
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#define TIMER3B ((3 << HW_TIMER_SHIFT) | HWT_CHANNEL_B)
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#define TIMER3C ((3 << HW_TIMER_SHIFT) | HWT_CHANNEL_C)
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#define TIMER4A ((4 << HW_TIMER_SHIFT) | HWT_CHANNEL_A)
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#define TIMER4B ((4 << HW_TIMER_SHIFT) | HWT_CHANNEL_B)
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#define TIMER4C ((4 << HW_TIMER_SHIFT) | HWT_CHANNEL_C)
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#define TIMER4D ((4 << HW_TIMER_SHIFT) | HWT_CHANNEL_D)
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#define TIMER5A ((5 << HW_TIMER_SHIFT) | HWT_CHANNEL_A)
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#define TIMER5B ((5 << HW_TIMER_SHIFT) | HWT_CHANNEL_B)
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#define TIMER5C ((5 << HW_TIMER_SHIFT) | HWT_CHANNEL_C)
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#ifdef __cplusplus
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extern "C" {
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#endif
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static inline void analogWrite(uint8_t pin, int val)
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{
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/*
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* Note on the timer usage: Arduino has code here that
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* explicitly checks if the given val is 0 or 0xFF.
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* The 16-bit timers on Arduino use the phase correct PWM
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* waveform generation mode which already sets the output to
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* continuous low for 0 or continuous high for 0xFF. When using
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* an 8-bit timer, Arduino uses fast PWM which creates a tiny
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* spike for 0, so to be Arduino-compatible in this mode we use
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* digitalWrite in this case.
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*/
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uint8_t arduino_timer = digitalPinToTimer(pin);
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pinMode(pin, OUTPUT);
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if (val == 0 || arduino_timer == NOT_ON_TIMER) {
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digitalWrite(pin, (val < 128) ? LOW : HIGH);
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} else {
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uint8_t t = arduino_timer >> HW_TIMER_SHIFT;
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uint8_t c = arduino_timer & HWT_CHANNEL_MASK;
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hwtimer_pwm_enable (t, c);
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hwtimer_set_pwm (t, c, val);
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}
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}
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/*
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* turnOffPWM of arduino is implemented by hw_timer
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*/
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#define turnOffPWM(atimer) \
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( (atimer) == NOT_ON_TIMER \
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? (void)0 \
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: (void)hwtimer_pwm_disable \
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(atimer >> HW_TIMER_SHIFT, atimer & HWT_CHANNEL_MASK) \
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)
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/*
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* micros on arduino takes timer overflows into account.
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* We put in the seconds counter. To get a consistent seconds / ticks
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* value we have to disable interrupts.
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*/
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static inline uint32_t micros (void)
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{
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uint32_t ticks;
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uint8_t sreg = SREG;
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cli ();
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ticks = clock_seconds () * 1000000L
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+ clock_time () * 1000L / CLOCK_SECOND;
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SREG = sreg;
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return ticks;
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}
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/*
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* millis counts only internal timer ticks since start, not trying to do
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* something about overflows. Note that we don't try to emulate overflow
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* behaviour of arduino implementation.
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*/
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#define millis() (((uint32_t)clock_time())*1000L/CLOCK_SECOND)
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#define micros() (clock_seconds()*1000L+
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#define delay(ms) clock_delay_msec(ms)
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#define delayMicroseconds(us) clock_delay_usec(us)
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#define analogRead(analogpin) readADC(analogpin)
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#ifdef __cplusplus
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} // extern "C"
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#endif
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/*
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* VI settings, see coding style
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* ex:ts=8:et:sw=2
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*/
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/** @} */
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