70 lines
2.7 KiB
C
70 lines
2.7 KiB
C
/***************************************************************************
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* Copyright (C) 01/2008 by Olaf Rempel *
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* razzor@kopf-tisch.de *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; version 2 of the License *
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* *
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* This program 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. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#include <stdint.h>
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#include <stdio.h>
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#include "AT91SAM7S256.h"
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#include "board.h"
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#include "at91_pio.h"
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/* extern symbols, defined in ldscript */
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extern struct pio_pinchange_isr _pio_isr_table;
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extern struct pio_pinchange_isr _pio_isr_table_end;
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static void pio_isr(void)
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{
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uint32_t status = *AT91C_PIOA_ISR;
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uint32_t input = *AT91C_PIOA_PDSR;
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struct pio_pinchange_isr *isr;
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for (isr = &_pio_isr_table; isr < &_pio_isr_table_end; isr++)
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if (isr->mask & status)
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isr->func(status, input);
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}
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void pio_trigger_isr(uint32_t mask)
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{
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uint32_t input = *AT91C_PIOA_PDSR;
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struct pio_pinchange_isr *isr;
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for (isr = &_pio_isr_table; isr < &_pio_isr_table_end; isr++)
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if (isr->mask & mask)
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isr->func(mask, input);
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}
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void at91_pio_init(void)
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{
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/* enable PIO clock */
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*AT91C_PMC_PCER = (1 << AT91C_ID_PIOA);
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/* enable pinchange interrupts */
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struct pio_pinchange_isr *isr;
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for (isr = &_pio_isr_table; isr < &_pio_isr_table_end; isr++)
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*AT91C_PIOA_IER = isr->mask;
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/* dummy read to clear interrupts */
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uint32_t dummy = *AT91C_PIOA_ISR;
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dummy = dummy;
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/* low priority, level triggered, own vector */
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AT91S_AIC *aic = AT91C_BASE_AIC;
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aic->AIC_SMR[AT91C_ID_PIOA] = IRQPRIO_PIOA | AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL;
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aic->AIC_SVR[AT91C_ID_PIOA] = (uint32_t)pio_isr;
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aic->AIC_IECR = (1 << AT91C_ID_PIOA);
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}
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