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wiring_analog.c
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/*
Copyright (c) 2011 Arduino. All right reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "Arduino.h"
#include "PinConfigured.h"
#ifdef __cplusplus
extern "C"
{
#endif
//This is the list of the IOs configured
uint32_t g_anOutputPinConfigured[MAX_NB_PORT] = {0};
static int _readResolution = 10;
static int _writeResolution = 8;
void analogReadResolution(int res)
{
_readResolution = res;
}
void analogWriteResolution(int res)
{
_writeResolution = res;
}
static inline uint32_t mapResolution(uint32_t value, uint32_t from, uint32_t to)
{
if (from == to)
return value;
if (from > to)
return value >> (from - to);
else
return value << (to - from);
}
//perform the read operation on the selected analog pin.
//the initialization of the analog PIN is done through this function
uint32_t analogRead(uint32_t ulPin)
{
uint32_t value = 0;
PinName p = analogInputToPinName(ulPin);
if (p != NC)
{
value = adc_read_value(p);
}
return value;
}
void analogOutputInit(void)
{
}
// Right now, PWM output only works on the pins with
// hardware support. These are defined in the appropriate
// variant.cpp file. For the rest of the pins, we default
// to digital output.
void analogWrite(uint32_t ulPin, uint32_t ulValue)
{
uint8_t do_init = 0;
PinName p = digitalPinToPinName(ulPin);
if (p != NC)
{
#ifdef HAL_DAC_MODULE_ENABLED
if (pin_in_pinmap(p, PinMap_DAC))
{
if (is_pin_configured(p, g_anOutputPinConfigured) == false)
{
do_init = 1;
set_pin_configured(p, g_anOutputPinConfigured);
}
ulValue = mapResolution(ulValue, _writeResolution, DACC_RESOLUTION);
dac_write_value(p, ulValue, do_init);
}
else
#endif //HAL_DAC_MODULE_ENABLED
if (pin_in_pinmap(p, PinMap_PWM))
{
if (is_pin_configured(p, g_anOutputPinConfigured) == false)
{
do_init = 1;
pinMode(ulPin, OUTPUT);
set_pin_configured(p, g_anOutputPinConfigured);
}
ulValue = mapResolution(ulValue, _writeResolution, PWM_RESOLUTION);
pwm_start(p, (uint32_t)((uint32_t)PWM_FREQUENCY * (uint32_t)PWM_MAX_DUTY_CYCLE),
PWM_MAX_DUTY_CYCLE,
ulValue, do_init);
}
else
{ //DIGITAL PIN ONLY
// Defaults to digital write
pinMode(ulPin, OUTPUT);
ulValue = mapResolution(ulValue, _writeResolution, 8);
if (ulValue < 128)
{
digitalWrite(ulPin, LOW);
}
else
{
digitalWrite(ulPin, HIGH);
}
}
}
}
#ifdef __cplusplus
}
#endif