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16 byte DMA buffer

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Ian Scott committed 2023-01-28 23:28:35 -07:00
1 parent 6bfde53004
commit 3d595bea09
1 file changed
+14 -1
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sw/gus-x.cpp
+14 -1
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@@ -1404,15 +1404,28 @@ GUS_DMA_isr() {
return;
}
bool is_tc = dma_data & 0x100u;
const uint8_t dma_data8 = dma_data & 0xffu;
#ifdef PSRAM
psram_write8_async(&psram_spi, myGUS.dmaAddr, dma_config.invertMsb ? dma_data8 ^ 0x80 : dma_data8);
// psram_write8_async(&psram_spi, myGUS.dmaAddr, dma_config.invertMsb ? dma_data8 ^ 0x80 : dma_data8);
static uint8_t dma_buffer[32];
uint8_t buffer_addr = myGUS.dmaAddr & 0x1f;
dma_buffer[buffer_addr] = dma_config.invertMsb ? dma_data8 ^ 0x80 : dma_data8;
if ((buffer_addr & 0xf) == 0xf) {
psram_write_async(&psram_spi, myGUS.dmaAddr - 0xf, dma_buffer + (buffer_addr & 0x10), 16);
}
#else
GUSRam[myGUS.dmaAddr] = dma_data8;
#endif
// uart_print_hex_u32(dma_data);
if (dma_data & 0x100u) { // if TC
#ifdef PSRAM
if ((buffer_addr & 0xf) != 0xf) {
psram_write_async(&psram_spi, myGUS.dmaAddr - (buffer_addr & 0xf), dma_buffer + (buffer_addr & 0x10), (buffer_addr & 0xf) + 1);
}
#endif
/* Raise the TC irq, and stop DMA */
myGUS.DMAControl |= 0x100u; /* NTS: DOSBox SVN approach: Use bit 8 for DMA TC IRQ */
myGUS.IRQStatus |= 0x80;