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by msk-lywenn
1251 days ago
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No threads. Well, there’s two CPUs so you can count that as two threads. They run completely independently, operating on two different codes with different instruction sets. (ARM9 and ARM7TDMI) I don’t know what you mean exactly by time scheduling. There are several timers that you can configure and you can set them to raise an interrupt when they finish. They can restart automatically. There is an interrupt vector for both software and hardware interrupts. Software ones are raised by the swi assembly instruction. Hardware ones are raised by the aforementioned timers but also the display (vertical and horizontal blank), the sound system, wifi, etc. They can be enabled/disabled by setting a specific bit in a specific memory location (IE interrupt enable). Your interrupt handler is supposed to restore registers and clear the interrupt flag at the end. Context switching is done manually. I think libnds has an implementation of software threads. I don’t know how they work. |
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