128 lines
3.5 KiB
C
128 lines
3.5 KiB
C
/*
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Copyright (c) 2015 Arduino LLC. All right reserved.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "Arduino.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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void pinMode( uint32_t ulPin, uint32_t ulMode )
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{
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// Handle the case the pin isn't usable as PIO
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if ( g_APinDescription[ulPin].ulPinType == PIO_NOT_A_PIN )
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{
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return ;
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}
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EPortType port = g_APinDescription[ulPin].ulPort;
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uint32_t pin = g_APinDescription[ulPin].ulPin;
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uint32_t pinMask = (1ul << pin);
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// Set pin mode according to chapter '22.6.3 I/O Pin Configuration'
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switch ( ulMode )
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{
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case INPUT:
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// Set pin to input mode
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PORT->Group[port].PINCFG[pin].reg=(uint8_t)(PORT_PINCFG_INEN) ;
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PORT->Group[port].DIRCLR.reg = pinMask ;
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break ;
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case INPUT_PULLUP:
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// Set pin to input mode with pull-up resistor enabled
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PORT->Group[port].PINCFG[pin].reg=(uint8_t)(PORT_PINCFG_INEN|PORT_PINCFG_PULLEN) ;
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PORT->Group[port].DIRCLR.reg = pinMask ;
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// Enable pull level (cf '22.6.3.2 Input Configuration' and '22.8.7 Data Output Value Set')
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PORT->Group[port].OUTSET.reg = pinMask ;
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break ;
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case INPUT_PULLDOWN:
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// Set pin to input mode with pull-down resistor enabled
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PORT->Group[port].PINCFG[pin].reg=(uint8_t)(PORT_PINCFG_INEN|PORT_PINCFG_PULLEN) ;
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PORT->Group[port].DIRCLR.reg = pinMask ;
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// Enable pull level (cf '22.6.3.2 Input Configuration' and '22.8.6 Data Output Value Clear')
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PORT->Group[port].OUTCLR.reg = pinMask ;
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break ;
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case OUTPUT:
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// enable input, to support reading back values, with pullups disabled
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PORT->Group[port].PINCFG[pin].reg=(uint8_t)(PORT_PINCFG_INEN) ;
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// Set pin to output mode
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PORT->Group[port].DIRSET.reg = pinMask ;
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break ;
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default:
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// do nothing
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break ;
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}
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}
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void digitalWrite( uint32_t ulPin, uint32_t ulVal )
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{
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// Handle the case the pin isn't usable as PIO
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if ( g_APinDescription[ulPin].ulPinType == PIO_NOT_A_PIN )
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{
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return ;
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}
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EPortType port = g_APinDescription[ulPin].ulPort;
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uint32_t pin = g_APinDescription[ulPin].ulPin;
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uint32_t pinMask = (1ul << pin);
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if ( (PORT->Group[port].DIRSET.reg & pinMask) == 0 ) {
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// the pin is not an output, disable pull-up if val is LOW, otherwise enable pull-up
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PORT->Group[port].PINCFG[pin].bit.PULLEN = ((ulVal == LOW) ? 0 : 1) ;
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}
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switch ( ulVal )
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{
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case LOW:
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PORT->Group[port].OUTCLR.reg = pinMask;
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break ;
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default:
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PORT->Group[port].OUTSET.reg = pinMask;
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break ;
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}
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return ;
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}
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int digitalRead( uint32_t ulPin )
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{
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// Handle the case the pin isn't usable as PIO
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if ( g_APinDescription[ulPin].ulPinType == PIO_NOT_A_PIN )
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{
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return LOW ;
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}
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if ( (PORT->Group[g_APinDescription[ulPin].ulPort].IN.reg & (1ul << g_APinDescription[ulPin].ulPin)) != 0 )
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{
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return HIGH ;
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}
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return LOW ;
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}
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#ifdef __cplusplus
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}
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#endif
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