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SB16: Write the correct DMA buffer offset for 16-bit samples.

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Also switch to using single-cycle mode for now. It would be nice to add
support for auto-initialized mode but this works okay at the moment.
This commit is contained in:
Andreas Kling 2019-07-13 21:28:35 +02:00
parent ec7b98f079
commit 983245113a
1 changed files with 6 additions and 5 deletions
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11
Kernel/Devices/SB16.cpp
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@ -123,8 +123,9 @@ void SB16::dma_start(uint32_t length)
IO::out8(0xd6, (channel % 4) | mode);
// Write the offset of the buffer
IO::out8(0xc4, (u8)addr);
IO::out8(0xc4, (u8)(addr >> 8));
u16 offset = (addr / 2) % 65536;
IO::out8(0xc4, (u8)offset);
IO::out8(0xc4, (u8)(offset >> 8));
// Write the transfer length
IO::out8(0xc6, (u8)(length - 1));
@ -175,9 +176,9 @@ ssize_t SB16::write(FileDescription&, const u8* data, ssize_t length)
memcpy(m_dma_buffer_page->paddr().as_ptr(), data, length);
dma_start(length);
u8 command = 0x06;
// Send 16-bit samples.
command |= 0xb0;
// 16-bit single-cycle output.
// FIXME: Implement auto-initialized output.
u8 command = 0xb0;
u16 sample_count = length / sizeof(i16);
if (mode & (u8)SampleFormat::Stereo)