82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
/*
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* Interrupts
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*
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* Handle interrupts, the levels.
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*
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* This file is part of BaS_gcc.
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*
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* BaS_gcc 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, either version 3 of the License, or
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* (at your option) any later version.
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*
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* BaS_gcc 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 BaS_gcc. If not, see <http://www.gnu.org/licenses/>.
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*
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* Created on: 26.02.2013
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* Author: Markus Fröschle
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*/
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#include <stdint.h>
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#include "MCF5475.h"
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#include "bas_utils.h"
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#include "bas_printf.h"
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#include "exceptions.h"
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#include "interrupts.h"
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#include "bas_printf.h"
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extern void (*rt_vbr[])(void);
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#define VBR rt_vbr
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/*
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* register an interrupt handler at the Coldfire interrupt controller and add the handler to
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* the interrupt vector table
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*/
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int register_interrupt_handler(uint8_t source, uint8_t level, uint8_t priority, uint8_t intr, void (*handler)(void))
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{
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int ipl;
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int i;
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volatile uint8_t *ICR = &MCF_INTC_ICR01 - 1;
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uint8_t lp;
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source &= 63;
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priority &= 7;
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if (source < 1 || source > 63)
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{
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xprintf("%s: interrupt source %d not defined\r\n", __FUNCTION__, source);
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return -1;
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}
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lp = MCF_INTC_ICR_IL(level) | MCF_INTC_ICR_IP(priority);
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/* check if this combination is already set somewhere */
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for (i = 1; i < 64; i++)
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{
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if (ICR[i] == lp)
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{
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xprintf("%s: level %d and priority %d already used for interrupt source %d!\r\n", __FUNCTION__,
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level, priority, i);
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return -1;
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}
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}
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/* disable interrupts */
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ipl = set_ipl(7);
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VBR[64 + source] = handler; /* first 64 vectors are system exceptions */
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/* set level and priority in interrupt controller */
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ICR[source] = lp;
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/* set interrupt mask to where it was before */
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set_ipl(ipl);
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return 0;
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}
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