Git-Mirrors/portapack-mayhem
1
0
Fork 0
mirror of https://github.com/eried/portapack-mayhem.git synced 2025-07-30 10:09:25 -04:00
Code Issues Projects Releases Packages Wiki Activity

Generalize method for executing SPI flash image in M4 RAM.

Browse source
This commit is contained in:
Jared Boone 2015-07-30 09:41:33 -07:00
parent d4c43044e0
commit b32f5e2239
4 changed files with 79 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

13
firmware/application/m4_startup.cpp
View file

@ -23,15 +23,8 @@
#include "hal.h"
#include <cstdint>
#include <cstddef>
#include <cstring>
static constexpr uint32_t m4_text_flash_image_offset = 0x20000;
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?
@ -39,14 +32,14 @@ static constexpr uint32_t m4_text_ram_base = 0x10080000;
* 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() {
void m4_init(const portapack::spi_flash::region_t from, void* const to) {
/* Initialize M4 code RAM */
std::memcpy((void*)m4_text_ram_base, (void*)m4_text_flash_base, m4_text_size);
std::memcpy(to, from.base_address(), from.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;
LPC_CREG->M4MEMMAP = reinterpret_cast<uint32_t>(to);
/* Reset M4 core */
LPC_RGU->RESET_CTRL[0] = (1 << 13);