mirror of
https://github.com/eried/portapack-mayhem.git
synced 2024-10-01 01:26:06 -04:00
54 lines
1.9 KiB
C++
54 lines
1.9 KiB
C++
|
/*
|
||
|
|
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
|
||
|
|
*
|
||
|
|
* This file is part of PortaPack.
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License as published by
|
||
|
|
* the Free Software Foundation; either version 2, or (at your option)
|
||
|
|
* any later version.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program; see the file COPYING. If not, write to
|
||
|
|
* the Free Software Foundation, Inc., 51 Franklin Street,
|
||
|
|
* Boston, MA 02110-1301, USA.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "m4_startup.hpp"
|
||
|
|
|
||
|
|
#include "hal.h"
|
||
|
|
|
||
|
|
#include <cstdint>
|
||
|
|
#include <cstddef>
|
||
|
|
#include <cstring>
|
||
|
|
|
||
|
|
static constexpr uint32_t m4_text_flash_image_offset = 0x10000;
|
||
|
|
static constexpr size_t m4_text_size = 0x8000;
|
||
|
|
static constexpr uint32_t m4_text_flash_base = LPC_SPIFI_DATA_CACHED_BASE + m4_text_flash_image_offset;
|
||
|
|
static constexpr uint32_t m4_text_ram_base = 0x10080000;
|
||
|
|
|
||
|
|
/* TODO: OK, this is cool, but how do I put the M4 to sleep so I can switch to
|
||
|
|
* a different image? Other than asking the old image to sleep while the M0
|
||
|
|
* makes changes?
|
||
|
|
*
|
||
|
|
* I suppose I could force M4MEMMAP to an invalid memory reason which would
|
||
|
|
* cause an exception and effectively halt the M4. But that feels gross.
|
||
|
|
*/
|
||
|
|
void m4_init() {
|
||
|
|
/* Initialize M4 code RAM */
|
||
|
|
std::memcpy((void*)m4_text_ram_base, (void*)m4_text_flash_base, m4_text_size);
|
||
|
|
|
||
|
|
/* M4 core is assumed to be sleeping with interrupts off, so we can mess
|
||
|
|
* with its address space and RAM without concern.
|
||
|
|
*/
|
||
|
|
LPC_CREG->M4MEMMAP = m4_text_ram_base;
|
||
|
|
|
||
|
|
/* Reset M4 core */
|
||
|
|
LPC_RGU->RESET_CTRL[0] = (1 << 13);
|
||
|
|
}
|