130 lines
4.5 KiB
C
130 lines
4.5 KiB
C
/*
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Copyright (c) 2015 Arduino LLC. All right reserved.
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SAMD51 support added by Adafruit - Copyright (c) 2018 Dean Miller for Adafruit Industries
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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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#include "wiring_private.h"
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int pinPeripheral( uint32_t ulPin, EPioType ulPeripheral )
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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 -1 ;
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}
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switch ( ulPeripheral )
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{
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case PIO_DIGITAL:
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case PIO_INPUT:
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case PIO_INPUT_PULLUP:
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case PIO_OUTPUT:
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// Disable peripheral muxing, done in pinMode
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// PORT->Group[g_APinDescription[ulPin].ulPort].PINCFG[g_APinDescription[ulPin].ulPin].bit.PMUXEN = 0 ;
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// Configure pin mode, if requested
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if ( ulPeripheral == PIO_INPUT )
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{
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pinMode( ulPin, INPUT ) ;
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}
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else
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{
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if ( ulPeripheral == PIO_INPUT_PULLUP )
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{
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pinMode( ulPin, INPUT_PULLUP ) ;
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}
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else
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{
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if ( ulPeripheral == PIO_OUTPUT )
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{
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pinMode( ulPin, OUTPUT ) ;
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}
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else
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{
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// PIO_DIGITAL, do we have to do something as all cases are covered?
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}
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}
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}
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break ;
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case PIO_ANALOG:
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case PIO_SERCOM:
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case PIO_SERCOM_ALT:
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case PIO_TIMER:
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case PIO_TIMER_ALT:
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case PIO_EXTINT:
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#if defined(__SAMD51__)
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case PIO_TCC_PDEC:
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case PIO_COM:
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case PIO_SDHC:
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case PIO_I2S:
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case PIO_PCC:
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case PIO_GMAC:
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case PIO_AC_CLK:
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case PIO_CCL:
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#else
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case PIO_COM:
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case PIO_AC_CLK:
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#endif
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#if 0
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// Is the pio pin in the lower 16 ones?
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// The WRCONFIG register allows update of only 16 pin max out of 32
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if ( g_APinDescription[ulPin].ulPin < 16 )
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{
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PORT->Group[g_APinDescription[ulPin].ulPort].WRCONFIG.reg = PORT_WRCONFIG_WRPMUX | PORT_WRCONFIG_PMUXEN | PORT_WRCONFIG_PMUX( ulPeripheral ) |
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PORT_WRCONFIG_WRPINCFG |
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PORT_WRCONFIG_PINMASK( g_APinDescription[ulPin].ulPin ) ;
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}
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else
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{
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PORT->Group[g_APinDescription[ulPin].ulPort].WRCONFIG.reg = PORT_WRCONFIG_HWSEL |
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PORT_WRCONFIG_WRPMUX | PORT_WRCONFIG_PMUXEN | PORT_WRCONFIG_PMUX( ulPeripheral ) |
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PORT_WRCONFIG_WRPINCFG |
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PORT_WRCONFIG_PINMASK( g_APinDescription[ulPin].ulPin - 16 ) ;
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}
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#else
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if ( g_APinDescription[ulPin].ulPin & 1 ) // is pin odd?
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{
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uint32_t temp ;
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// Get whole current setup for both odd and even pins and remove odd one
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temp = (PORT->Group[g_APinDescription[ulPin].ulPort].PMUX[g_APinDescription[ulPin].ulPin >> 1].reg) & PORT_PMUX_PMUXE( 0xF ) ;
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// Set new muxing
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PORT->Group[g_APinDescription[ulPin].ulPort].PMUX[g_APinDescription[ulPin].ulPin >> 1].reg = temp|PORT_PMUX_PMUXO( ulPeripheral ) ;
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// Enable port mux
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PORT->Group[g_APinDescription[ulPin].ulPort].PINCFG[g_APinDescription[ulPin].ulPin].reg |= PORT_PINCFG_PMUXEN ;
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}
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else // even pin
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{
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uint32_t temp ;
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temp = (PORT->Group[g_APinDescription[ulPin].ulPort].PMUX[g_APinDescription[ulPin].ulPin >> 1].reg) & PORT_PMUX_PMUXO( 0xF ) ;
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PORT->Group[g_APinDescription[ulPin].ulPort].PMUX[g_APinDescription[ulPin].ulPin >> 1].reg = temp|PORT_PMUX_PMUXE( ulPeripheral ) ;
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PORT->Group[g_APinDescription[ulPin].ulPort].PINCFG[g_APinDescription[ulPin].ulPin].reg |= PORT_PINCFG_PMUXEN ; // Enable port mux
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}
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#endif
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break ;
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case PIO_NOT_A_PIN:
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return -1l ;
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break ;
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}
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return 0l ;
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}
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