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h8_sci: Suppress SCK transition at end of transmit sequence (fixes regression in puzzlet)

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This commit is contained in:
AJR 2024-02-20 15:34:03 -05:00
parent b4f2076063
commit 3c038a50af
1 changed files with 10 additions and 2 deletions
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12
src/devices/cpu/h8/h8_sci.cpp
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@ -374,8 +374,12 @@ u64 h8_sci_device::internal_update(u64 current_time)
bool new_clock = delta >= m_divider;
if(new_clock != m_tx_clock_value) {
machine().scheduler().synchronize();
if(!new_clock)
if(!new_clock) {
tx_dropped_edge();
// HACK: prevent extra transition on SCK output at end of transmission sequence
if(m_tx_state == ST_IDLE)
new_clock = true;
}
m_tx_clock_value = new_clock;
if(m_clock_state || m_tx_clock_value)
@ -421,8 +425,12 @@ u64 h8_sci_device::internal_update(u64 current_time)
bool new_clock = delta >= m_divider*8;
if(new_clock != m_tx_clock_value) {
machine().scheduler().synchronize();
if(!new_clock)
if(!new_clock) {
tx_dropped_edge();
// HACK: prevent extra transition on SCK output at end of transmission sequence
if(m_tx_state == ST_IDLE)
new_clock = true;
}
m_tx_clock_value = new_clock;
if(m_clock_mode == clock_mode_t::INTERNAL_ASYNC_OUT && (m_clock_state || !m_tx_clock_value))