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The block scan checked for the loop end before it checked for a P write, so a block whose last instruction writes P memory and ends a loop was classified as a loop end only. Its run function never checked the write, and a block that holds the whole loop body runs all iterations inside itself, which keeps only one written address anyway. Code patched by such a loop kept running the blocks compiled before the patch. Such a block still ends as a loop end, but is flagged as writing P memory: the write is checked after every iteration, and the loop no longer iterates inside the block. Unit test doLoopWritesCode. |
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Motorola DSP 56300 family emulator
Emulation of the Motorola/Freescale/NXP 56300 family DSP
This DSP has been used in plenty of virtual analogue synthesizers and other musical gear that was released after around the mid 90s, such as Access Virus A, B, C, TI / Clavia Nord Lead 3 / Waldorf Q, Microwave II / Novation Supernova, Nova and many others.
The emulator should compile just fine on any platform that supports C++17, no configure is needed as the code uses C++17 standard data types. For performance reasons, it makes excessive use of C++17 features, for example to parse opcode definitions at compile time and to create jump tables of template permutations, so C++17 is a strong requirement.
The build system used is cmake.
Development
Please note that this project is a generic DSP emulator and outputs nothing but a static library after building. To use it, you need to create a project on your own, which can be a command line app, a VST plugin or whatever and instantiate the DSP class and feed data into it.
Minimal example:
#include "../dsp56300/source/dsp56kEmu/dsp.h"
int main(int argc, char* argv[])
{
// Create DSP memory
constexpr TWord g_memorySize = 0x040000;
const DefaultMemoryValidator memoryMap;
Memory memory(memoryMap, g_memorySize);
// External SRAM starts at 0x20000
memory.setExternalMemory(0x020000, true);
// TODO: Load useful data into memory like this
// Example: write a nop to P memory at address $100
// memory.set(MemArea_P, 0x100, 0x000000);
// Use 56362 peripherals: ESAI, HDI08
Peripherals56362 periph;
// Instantiate DSP
DSP dsp(memory, &periph, &periph);
// set starting address
dsp.setPC(0x100);
while(true)
{
// run forever
dsp.exec();
}
}