mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-13 19:54:39 +00:00
54 lines
1.9 KiB
C++
54 lines
1.9 KiB
C++
/*
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* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
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*
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* This file is part of PortaPack.
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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; either version 2, or (at your option)
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* any later version.
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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; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "m4_startup.hpp"
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#include "hal.h"
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#include <cstdint>
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#include <cstddef>
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#include <cstring>
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static constexpr uint32_t m4_text_flash_image_offset = 0x10000;
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static constexpr size_t m4_text_size = 0x8000;
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static constexpr uint32_t m4_text_flash_base = LPC_SPIFI_DATA_CACHED_BASE + m4_text_flash_image_offset;
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static constexpr uint32_t m4_text_ram_base = 0x10080000;
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/* TODO: OK, this is cool, but how do I put the M4 to sleep so I can switch to
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* a different image? Other than asking the old image to sleep while the M0
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* makes changes?
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*
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* I suppose I could force M4MEMMAP to an invalid memory reason which would
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* cause an exception and effectively halt the M4. But that feels gross.
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*/
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void m4_init() {
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/* Initialize M4 code RAM */
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std::memcpy((void*)m4_text_ram_base, (void*)m4_text_flash_base, m4_text_size);
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/* M4 core is assumed to be sleeping with interrupts off, so we can mess
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* with its address space and RAM without concern.
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*/
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LPC_CREG->M4MEMMAP = m4_text_ram_base;
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/* Reset M4 core */
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LPC_RGU->RESET_CTRL[0] = (1 << 13);
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}
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