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machine/7200fifo.cpp: Fixed triggering of half-full flag.

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This commit is contained in:
Nigel Barnes 2021-11-14 13:13:18 +00:00
parent 60fc286c53
commit 67671d7d89
2 changed files with 21 additions and 2 deletions
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22
src/devices/machine/7200fifo.cpp
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@ -132,7 +132,7 @@ void fifo7200_device::fifo_write(uint16_t data)
m_ff_handler(!m_ff);
}
else if (((m_read_ptr + 1 + m_ram_size / 2) % m_ram_size) == m_write_ptr)
else if (!m_hf && (fifo_used() >= m_ram_size / 2))
{
m_hf = 1;
m_hf_handler(!m_hf);
@ -166,12 +166,30 @@ uint16_t fifo7200_device::fifo_read()
m_ef_handler(!m_ef);
}
else if (((m_read_ptr + m_ram_size / 2) % m_ram_size) == m_write_ptr)
else if (m_hf && (fifo_used() < m_ram_size / 2))
{
m_hf = 0;
m_hf_handler(!m_hf);
}
}
return ret;
}
int fifo7200_device::fifo_used()
{
int ret = m_ram_size;
if (!m_ff)
{
if (m_write_ptr >= m_read_ptr)
{
ret = m_write_ptr - m_read_ptr;
}
else
{
ret = m_ram_size + m_write_ptr - m_read_ptr;
}
}
return ret;
}

1
src/devices/machine/7200fifo.h
View File

@ -88,6 +88,7 @@ protected:
private:
void fifo_write(uint16_t data);
uint16_t fifo_read();
int fifo_used();
std::vector<uint16_t> m_buffer;
const int m_ram_size;