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Diffstat (limited to 'src/devices/bus/rtpc/kbd_con.cpp')
-rw-r--r--src/devices/bus/rtpc/kbd_con.cpp129
1 files changed, 129 insertions, 0 deletions
diff --git a/src/devices/bus/rtpc/kbd_con.cpp b/src/devices/bus/rtpc/kbd_con.cpp
new file mode 100644
index 00000000000..9307e21a82a
--- /dev/null
+++ b/src/devices/bus/rtpc/kbd_con.cpp
@@ -0,0 +1,129 @@
+// license:BSD-3-Clause
+// copyright-holders:Patrick Mackinlay
+
+/*
+ * While not physically compatible, the RT PC keyboard protocol is logically
+ * and electrically identical to the PC/AT. This implementation is copied from
+ * pc_kbdc and implements the same bi-directional clock and data lines.
+ */
+
+#include "emu.h"
+#include "kbd_con.h"
+
+#define LOG_GENERAL (1U << 0)
+
+#define VERBOSE (LOG_GENERAL)
+#include "logmacro.h"
+
+DEFINE_DEVICE_TYPE(RTPC_KBD_CON, rtpc_kbd_con_device, "rtpc_kbd_con", "RT PC keyboard connector")
+
+rtpc_kbd_con_device::rtpc_kbd_con_device(machine_config const &mconfig, char const *tag, device_t *owner, u32 clock)
+ : device_t(mconfig, RTPC_KBD_CON, tag, owner, clock)
+ , device_single_card_slot_interface<device_rtpc_kbd_interface>(mconfig, *this)
+ , m_out_clock_cb(*this)
+ , m_out_data_cb(*this)
+ , m_clock_state(-1)
+ , m_data_state(-1)
+ , m_mb_clock_state(0)
+ , m_mb_data_state(0)
+ , m_kb_clock_state(1)
+ , m_kb_data_state(1)
+ , m_keyboard(nullptr)
+{
+}
+
+void rtpc_kbd_con_device::device_config_complete()
+{
+ m_keyboard = get_card_device();
+}
+
+void rtpc_kbd_con_device::device_resolve_objects()
+{
+ m_out_clock_cb.resolve_safe();
+ m_out_data_cb.resolve_safe();
+}
+
+void rtpc_kbd_con_device::device_start()
+{
+ save_item(NAME(m_clock_state));
+ save_item(NAME(m_data_state));
+
+ save_item(NAME(m_mb_clock_state));
+ save_item(NAME(m_mb_data_state));
+ save_item(NAME(m_kb_clock_state));
+ save_item(NAME(m_kb_data_state));
+
+ m_clock_state = -1;
+ m_data_state = -1;
+
+ m_mb_clock_state = 1;
+ m_mb_data_state = 1;
+ m_kb_clock_state = 1;
+ m_kb_data_state = 1;
+}
+
+void rtpc_kbd_con_device::update_clock_state(bool fromkb)
+{
+ int new_clock_state = m_mb_clock_state & m_kb_clock_state;
+
+ if (new_clock_state != m_clock_state)
+ {
+ m_clock_state = new_clock_state;
+ LOG("%s clock: %d\n", fromkb? "<-" : "->", m_clock_state);
+
+ // send state to host
+ m_out_clock_cb(m_clock_state);
+
+ // send state to keyboard
+ if (m_keyboard)
+ m_keyboard->clock_w(m_clock_state);
+ }
+}
+
+void rtpc_kbd_con_device::update_data_state(bool fromkb)
+{
+ int new_data_state = m_mb_data_state & m_kb_data_state;
+
+ if (new_data_state != m_data_state)
+ {
+ m_data_state = new_data_state;
+ LOG("%s data: %d\n", fromkb? "<-" : "->", m_data_state);
+
+ // send state to host
+ m_out_data_cb(m_data_state);
+
+ // send state to keyboard
+ if (m_keyboard)
+ m_keyboard->data_w(m_data_state);
+ }
+}
+
+void rtpc_kbd_con_device::clock_write_from_mb(int state)
+{
+ m_mb_clock_state = state;
+ update_clock_state(false);
+}
+
+void rtpc_kbd_con_device::data_write_from_mb(int state)
+{
+ m_mb_data_state = state;
+ update_data_state(false);
+}
+
+void rtpc_kbd_con_device::clock_write_from_kb(int state)
+{
+ m_kb_clock_state = state;
+ update_clock_state(true);
+}
+
+void rtpc_kbd_con_device::data_write_from_kb(int state)
+{
+ m_kb_data_state = state;
+ update_data_state(true);
+}
+
+device_rtpc_kbd_interface::device_rtpc_kbd_interface(machine_config const &mconfig, device_t &device)
+ : device_interface(device, "rtpc_kbd_if")
+ , m_port(dynamic_cast<rtpc_kbd_con_device *>(device.owner()))
+{
+}