mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-13 19:54:39 +00:00
119 lines
3.2 KiB
C++
119 lines
3.2 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 "core_control.hpp"
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#include "hal.h"
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#include "lpc43xx_cpp.hpp"
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using namespace lpc43xx;
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#include "message.hpp"
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#include "baseband_api.hpp"
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#include "portapack_shared_memory.hpp"
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#include <cstring>
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char * modhash;
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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(const portapack::spi_flash::region_t from, const portapack::memory::region_t to) {
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/* Initialize M4 code RAM */
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std::memcpy(reinterpret_cast<void*>(to.base()), from.base(), from.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 = to.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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void m4_request_shutdown() {
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baseband::shutdown();
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}
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void m0_halt() {
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rgu::reset(rgu::Reset::M0APP);
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while(true) {
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port_wait_for_interrupt();
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}
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}
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int m4_load_image(void) {
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uint32_t mod_size;
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UINT bw;
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uint8_t i;
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char md5sum[16];
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FILINFO modinfo;
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FIL modfile;
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DIR rootdir;
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FRESULT res;
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// Scan SD card root directory for files with the right md5 fingerprint at the right location
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f_opendir(&rootdir, "/");
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for (;;) {
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res = f_readdir(&rootdir, &modinfo);
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if (res != FR_OK || modinfo.fname[0] == 0) break;
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if (!(modinfo.fattrib & AM_DIR)) {
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f_open(&modfile, modinfo.fname, FA_OPEN_EXISTING | FA_READ);
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f_lseek(&modfile, 26);
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f_read(&modfile, &md5sum, 16, &bw);
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for (i = 0; i < 16; i++) {
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if (md5sum[i] != modhash[i]) break;
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}
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if (i == 16) {
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f_lseek(&modfile, 6);
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f_read(&modfile, &mod_size, 4, &bw);
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f_lseek(&modfile, 256);
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f_read(&modfile, reinterpret_cast<void*>(portapack::memory::map::m4_code.base()), mod_size, &bw);
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LPC_RGU->RESET_CTRL[0] = (1 << 13);
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f_close(&modfile);
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return 1;
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}
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f_close(&modfile);
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}
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}
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return 0;
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}
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void m4_switch(const char * hash) {
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modhash = const_cast<char*>(hash);
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// Ask M4 to enter loop in RAM
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BasebandConfiguration baseband_switch {
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.mode = 0xFF,
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.sampling_rate = 0,
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.decimation_factor = 1,
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};
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BasebandConfigurationMessage message { baseband_switch };
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shared_memory.baseband_queue.push(message);
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}
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