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-rw-r--r--src/devices/bus/nes_ctrl/bcbattle.cpp183
1 files changed, 183 insertions, 0 deletions
diff --git a/src/devices/bus/nes_ctrl/bcbattle.cpp b/src/devices/bus/nes_ctrl/bcbattle.cpp
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+++ b/src/devices/bus/nes_ctrl/bcbattle.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Fabio Priuli
+/**********************************************************************
+
+ Nintendo Family Computer - Epoch Barcode Battler
+
+ TODO: this should be actually emulated as a standalone system with
+ a few 7segments LEDs, once we get a dump of its BIOS
+ At the moment we only emulated the connection with a Famicom
+
+**********************************************************************/
+
+#include "bcbattle.h"
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type NES_BARCODE_BATTLER = &device_creator<nes_bcbattle_device>;
+
+
+MACHINE_CONFIG_FRAGMENT( nes_battler )
+ MCFG_BARCODE_READER_ADD("battler")
+MACHINE_CONFIG_END
+
+machine_config_constructor nes_bcbattle_device::device_mconfig_additions() const
+{
+ return MACHINE_CONFIG_NAME( nes_battler );
+}
+
+
+//-------------------------------------------------
+// device_timer - handler timer events
+//-------------------------------------------------
+
+// This part is the hacky replacement for the real Barcode unit [shared with SNES implementation]:
+// code periodically checks whether a new code has been scanned and it moves it to the
+// m_current_barcode array
+void nes_bcbattle_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
+{
+ if (id == TIMER_BATTLER)
+ {
+ int old = m_new_code;
+ // has something new been scanned?
+ if (old < m_reader->get_pending_code())
+ {
+ if (m_reader->get_byte_length() == 13)
+ {
+ for (int i = 0; i < 13; i++)
+ m_current_barcode[i] = m_reader->read_code() + '0';
+ }
+ else if (m_reader->get_byte_length() == 8)
+ {
+ for (int i = 0; i < 5; i++)
+ m_current_barcode[i] = 0x20;
+ for (int i = 5; i < 13; i++)
+ m_current_barcode[i] = m_reader->read_code() + '0';
+ }
+ // read one more, to reset the internal byte counter
+ m_reader->read_code();
+
+ // the string "SUNSOFT" is accepted as well by Barcode World
+ m_current_barcode[13] = 'E';
+ m_current_barcode[14] = 'P';
+ m_current_barcode[15] = 'O';
+ m_current_barcode[16] = 'C';
+ m_current_barcode[17] = 'H';
+ m_current_barcode[18] = 0x0d;
+ m_current_barcode[19] = 0x0a;
+ m_pending_code = 1;
+ }
+ m_new_code = m_reader->get_pending_code();
+ }
+}
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// nes_bcbattle_device - constructor
+//-------------------------------------------------
+
+nes_bcbattle_device::nes_bcbattle_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ device_t(mconfig, NES_BARCODE_BATTLER, "Epoch Barcode Battler (FC)", tag, owner, clock, "nes_bcbattle", __FILE__),
+ device_nes_control_port_interface(mconfig, *this),
+ m_reader(*this, "battler")
+{
+}
+
+
+//-------------------------------------------------
+// device_start
+//-------------------------------------------------
+
+void nes_bcbattle_device::device_start()
+{
+ // lacking emulation of the standalone Barcode Battler, we refresh periodically the input from the reader
+ // proper emulation would have the standalone unit acknowledging that a new barcode has been scanned
+ // and sending the proper serial bits, instead of our read_current_bit() function!
+ battler_timer = timer_alloc(TIMER_BATTLER);
+ battler_timer->adjust(attotime::zero, 0, machine().device<cpu_device>("maincpu")->cycles_to_attotime(1000));
+
+ save_item(NAME(m_current_barcode));
+ save_item(NAME(m_new_code));
+ save_item(NAME(m_pending_code));
+ save_item(NAME(m_transmitting));
+ save_item(NAME(m_cur_bit));
+ save_item(NAME(m_cur_byte));
+}
+
+
+//-------------------------------------------------
+// device_reset
+//-------------------------------------------------
+
+void nes_bcbattle_device::device_reset()
+{
+ m_pending_code = 0;
+ m_new_code = 0;
+ m_transmitting = 0;
+ m_cur_bit = 0;
+ m_cur_byte = 0;
+ memset(m_current_barcode, 0, ARRAY_LENGTH(m_current_barcode));
+}
+
+
+//-------------------------------------------------
+// read
+//-------------------------------------------------
+
+int nes_bcbattle_device::read_current_bit()
+{
+ if (m_pending_code && !m_transmitting)
+ {
+ // we start with 1
+ m_transmitting = 1;
+ m_cur_byte = 0;
+ m_cur_bit = 0;
+ return 1;
+ }
+
+ if (m_transmitting)
+ {
+ if (m_cur_bit == 0)
+ {
+ m_cur_bit++;
+ return 1;
+ }
+ if (m_cur_bit < 9)
+ {
+ int bit = (BIT(m_current_barcode[m_cur_byte], m_cur_bit - 1)) ^ 1;
+ m_cur_bit++;
+ return bit;
+ }
+ if (m_cur_bit == 9)
+ {
+ m_cur_bit = 0;
+ //printf("%X ", m_current_barcode[m_cur_byte]);
+ m_cur_byte++;
+ if (m_cur_byte == 20)
+ {
+ m_cur_byte = 0;
+ m_transmitting = 0;
+ m_pending_code = 0;
+ }
+ return 0;
+ }
+ }
+
+ return 0;
+}
+
+UINT8 nes_bcbattle_device::read_exp(offs_t offset)
+{
+ UINT8 ret = 0;
+ if (offset == 1) //$4017
+ {
+ ret |= read_current_bit() << 2;
+ }
+
+ return ret;
+}