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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,154 @@ | ||
| #include "../emulator.hpp" | ||
| #include "gbadma.hpp" | ||
|
|
||
| GBA_DMA::GBA_DMA(Emulator* e) : e(e) | ||
| { | ||
|
|
||
| } | ||
|
|
||
| void GBA_DMA::power_on() | ||
| { | ||
| active_DMAs = 0; | ||
| for (unsigned int i = 0; i < 4; i++) | ||
| dmas[i].CNT.set(0); | ||
| } | ||
|
|
||
| void GBA_DMA::handle_DMA(int index) | ||
| { | ||
| DMA* active_DMA = &dmas[index]; | ||
| for (;;) | ||
| { | ||
| active_DMA->internal_len++; | ||
| if (active_DMA->internal_len > active_DMA->length) | ||
| { | ||
| /*if (active_DMA->CNT.IRQ_after_transfer) | ||
| { | ||
| e->request_interrupt7(static_cast<INTERRUPT>(4 + active_DMA->index)); | ||
| }*/ | ||
| active_DMA->internal_len = 0; | ||
| active_DMAs &= ~(1 << index); | ||
| //Reload dest | ||
| if (active_DMA->CNT.dest_control == 3) | ||
| active_DMA->internal_dest = active_DMA->destination; | ||
| if (!active_DMA->CNT.repeat) | ||
| active_DMA->CNT.enabled = false; | ||
| return; | ||
| } | ||
|
|
||
| uint32_t value; | ||
| int offset; | ||
| if (active_DMA->CNT.word_transfer) | ||
| { | ||
| offset = 4; | ||
| value = e->gba_read_word(active_DMA->internal_source); | ||
| e->gba_write_word(active_DMA->internal_dest, value); | ||
| } | ||
| else | ||
| { | ||
| offset = 2; | ||
| value = e->gba_read_halfword(active_DMA->internal_source); | ||
| e->gba_write_halfword(active_DMA->internal_dest, value); | ||
| } | ||
|
|
||
| switch (active_DMA->CNT.dest_control) | ||
| { | ||
| case 0: | ||
| case 3: | ||
| active_DMA->internal_dest += offset; | ||
| break; | ||
| case 1: | ||
| active_DMA->internal_dest -= offset; | ||
| break; | ||
| case 2: | ||
| //Fixed | ||
| break; | ||
| default: | ||
| printf("\nUnrecognized DMA dest control %d", active_DMA->CNT.dest_control); | ||
| } | ||
| switch (active_DMA->CNT.source_control) | ||
| { | ||
| case 0: | ||
| active_DMA->internal_source += offset; | ||
| break; | ||
| case 1: | ||
| active_DMA->internal_source -= offset; | ||
| break; | ||
| case 2: | ||
| //Fixed | ||
| break; | ||
| default: | ||
| printf("\nUnrecognized DMA source control %d", active_DMA->CNT.source_control); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| uint16_t GBA_DMA::read_CNT(int index) | ||
| { | ||
| return dmas[index].CNT.get(); | ||
| } | ||
|
|
||
| uint32_t GBA_DMA::read_len_CNT(int index) | ||
| { | ||
| return dmas[index].length | (dmas[index].CNT.get() << 16); | ||
| } | ||
|
|
||
| void GBA_DMA::write_source(int index, uint32_t source) | ||
| { | ||
| dmas[index].source = source; | ||
| } | ||
|
|
||
| void GBA_DMA::write_dest(int index, uint32_t dest) | ||
| { | ||
| dmas[index].destination = dest; | ||
| } | ||
|
|
||
| void GBA_DMA::write_len(int index, uint32_t len) | ||
| { | ||
| if (index == 3) | ||
| { | ||
| if (!len) | ||
| dmas[index].length = 0x10000; | ||
| else | ||
| dmas[index].length = len & 0xFFFF; | ||
| } | ||
| else | ||
| { | ||
| if (!len) | ||
| dmas[index].length = 0x4000; | ||
| else | ||
| dmas[index].length = len & 0x3FFF; | ||
| } | ||
| } | ||
|
|
||
| void GBA_DMA::write_CNT(int index, uint16_t CNT) | ||
| { | ||
| bool old_enabled = dmas[index].CNT.enabled; | ||
| dmas[index].CNT.set(CNT); | ||
| if (!old_enabled && (CNT & (1 << 15))) | ||
| { | ||
| dmas[index].internal_source = dmas[index].source; | ||
| dmas[index].internal_dest = dmas[index].destination; | ||
| dmas[index].internal_len = 0; | ||
| if (dmas[index].CNT.timing) | ||
| { | ||
| printf("\nDMA%d activated", index); | ||
| printf("\nSource: $%08X", dmas[index].source); | ||
| printf("\nDest: $%08X", dmas[index].destination); | ||
| printf("\nLen: %d", dmas[index].length); | ||
| printf("\nCNT: $%04X", dmas[index].CNT.get()); | ||
| printf("\nTiming: %d", dmas[index].CNT.timing); | ||
| } | ||
|
|
||
| if (dmas[index].CNT.timing == 0) | ||
| { | ||
| //printf("\nRunning immediately"); | ||
| handle_DMA(index); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| void GBA_DMA::write_len_CNT(int index, uint32_t word) | ||
| { | ||
| write_len(index, word & 0xFFFF); | ||
| write_CNT(index, word >> 16); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| #ifndef DMA_HPP | ||
| #define DMA_HPP | ||
| #include "../dma.hpp" | ||
|
|
||
| class GBA_DMA | ||
| { | ||
| private: | ||
| Emulator* e; | ||
| uint8_t active_DMAs; | ||
| DMA dmas[4]; | ||
| public: | ||
| GBA_DMA(Emulator* e); | ||
|
|
||
| void power_on(); | ||
| void handle_DMA(int index); | ||
|
|
||
| uint16_t read_CNT(int index); | ||
| uint32_t read_len_CNT(int index); | ||
|
|
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| void write_source(int index, uint32_t source); | ||
| void write_dest(int index, uint32_t dest); | ||
| void write_len(int index, uint32_t len); | ||
| void write_CNT(int index, uint16_t CNT); | ||
| void write_len_CNT(int index, uint32_t word); | ||
| }; | ||
|
|
||
| #endif // GBADMA_HPP |
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