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#include <stdlib.h>
#include "genesis.h"
static io_port *get_ports(m68k_context *m68k)
{
genesis_context *gen = m68k->system;
if (!gen->extra) {
io_port *ports = calloc(2, sizeof(io_port));
ports[0].device_type = IO_GAMEPAD3;
ports[0].device.pad.gamepad_num = 3;
ports[1].device_type = IO_GAMEPAD3;
ports[1].device.pad.gamepad_num = 4;
io_control_write(ports, 0x40, 0);
io_control_write(ports + 1, 0x40, 0);
gen->extra = ports;
}
return gen->extra;
}
void *jcart_write_w(uint32_t address, void *context, uint16_t value)
{
m68k_context *m68k= context;
io_port *ports = get_ports(m68k);
value = value << 6 & 0x40;
io_data_write(ports, value, m68k->current_cycle);
io_data_write(ports + 1, value, m68k->current_cycle);
return context;
}
void *jcart_write_b(uint32_t address, void *context, uint8_t value)
{
if (address & 1) {
return jcart_write_w(address, context, value);
}
return context;
}
uint16_t jcart_read_w(uint32_t address, void *context)
{
m68k_context *m68k= context;
io_port *ports = get_ports(m68k);
//according to Eke, bit 14 is forced low, at least on the Micro Machines 2 cart
//TODO: Test behavior of actual cart
uint16_t value = io_data_read(ports, m68k->current_cycle) << 8;
value |= io_data_read(ports + 1, m68k->current_cycle);
return value;
}
uint8_t jcart_read_b(uint32_t address, void *context)
{
m68k_context *m68k= context;
io_port *ports = get_ports(m68k);
return io_data_read(ports + (address & 1), m68k->current_cycle);
}
void jcart_adjust_cycles(genesis_context *context, uint32_t deduction)
{
io_port *ports = get_ports(context->m68k);
io_adjust_cycles(ports, context->m68k->current_cycle, deduction);
io_adjust_cycles(ports + 1, context->m68k->current_cycle, deduction);
}
void jcart_gamepad_down(genesis_context *context, uint8_t gamepad_num, uint8_t button)
{
io_port *ports = get_ports(context->m68k);
if (gamepad_num == ports[1].device.pad.gamepad_num) {
ports++;
} else if (gamepad_num != ports[0].device.pad.gamepad_num) {
ports = NULL;
}
if (ports) {
io_port_gamepad_down(ports, button);
}
}
void jcart_gamepad_up(genesis_context *context, uint8_t gamepad_num, uint8_t button)
{
io_port *ports = get_ports(context->m68k);
if (gamepad_num == ports[1].device.pad.gamepad_num) {
ports++;
} else if (gamepad_num != ports[0].device.pad.gamepad_num) {
ports = NULL;
}
if (ports) {
io_port_gamepad_up(ports, button);
}
}
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