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feat: Initial Implementation of DMA Audio

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This commit is contained in:
Rekai Nyangadzayi Musuka
2022-10-21 05:12:33 -03:00
parent e69f4cfafe
commit f039c891c7
9 changed files with 233 additions and 71 deletions
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18
src/cpu.zig
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@@ -246,15 +246,6 @@ pub const Arm7tdmi = struct {
}
pub fn step(self: *Self) void {
// If we're processing a DMA (not Sound or Blanking) the CPU is disabled
if (self.handleDMATransfers()) return;
// If we're halted, the cpu is disabled
if (self.bus.io.haltcnt == .Halt) {
self.sched.tick += 1;
return;
}
if (self.cpsr.t.read()) {
const opcode = self.thumbFetch();
if (enable_logging) if (self.log_file) |file| self.debug_log(file, opcode);
@@ -296,15 +287,6 @@ pub const Arm7tdmi = struct {
}
}
fn handleDMATransfers(self: *Self) bool {
if (self.bus.dma._0.check(self.bus)) return self.bus.dma._0.isBlocking();
if (self.bus.dma._1.check(self.bus)) return self.bus.dma._1.isBlocking();
if (self.bus.dma._2.check(self.bus)) return self.bus.dma._2.isBlocking();
if (self.bus.dma._3.check(self.bus)) return self.bus.dma._3.isBlocking();
return false;
}
fn thumbFetch(self: *Self) u16 {
defer self.r[15] += 2;
return self.bus.read(u16, self.r[15]);