67 lines
2.4 KiB
C
67 lines
2.4 KiB
C
/*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 2020 Felix Kopp <sandtler@sandtler.club>
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*
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* Redistribution and use in source and binary forms, with or without modification, are permitted
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* provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its contributors may be
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* used to endorse or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
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* WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdint.h>
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#include <stddef.h>
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#define REG_PIOB_PER (*(uint32_t *)0x400E1000U)
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#define REG_PIOB_PDR (*(uint32_t *)0x400E1004U)
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#define REG_PIOB_OER (*(uint32_t *)0x400E1010U)
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#define REG_PIOB_ODR (*(uint32_t *)0x400E1014U)
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#define REG_PIOB_SODR (*(uint32_t *)0x400E1030U)
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#define REG_PIOB_CODR (*(uint32_t *)0x400E1034U)
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/**
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* Core init routine.
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*
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* This is invoked from the startup code (usually) located in
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* arch/<architecture>/startup.c.
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*/
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void do_bootstrap(void)
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{
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bool on = true;
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uint32_t state = (1 << 27);
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uint32_t count = 0;
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REG_PIOB_OER |= state;
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REG_PIOB_PER |= state;
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while (true)
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{
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if (count++ != 100000)
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continue;
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if (on) {
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REG_PIOB_SODR |= (1 << 27);
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on = false;
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} else {
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REG_PIOB_CODR |= (1 << 27);
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on = true;
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}
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count = 0;
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}
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}
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