Mercurial > repos > blastem
annotate jcart.c @ 1686:475e84bfccbb
Small fix to sync sample calculation in render_sdl
| author | Michael Pavone <pavone@retrodev.com> |
|---|---|
| date | Sun, 20 Jan 2019 01:02:48 -0800 |
| parents | 28ec17387be5 |
| children | 395f684c5379 |
| rev | line source |
|---|---|
| 1610 | 1 #include "genesis.h" |
| 2 | |
| 3 static io_port *get_ports(m68k_context *m68k) | |
| 4 { | |
| 5 genesis_context *gen = m68k->system; | |
| 6 if (!gen->extra) { | |
| 7 io_port *ports = calloc(2, sizeof(io_port)); | |
| 8 ports[0].device_type = IO_GAMEPAD3; | |
| 9 ports[0].device.pad.gamepad_num = 3; | |
| 10 ports[1].device_type = IO_GAMEPAD3; | |
| 11 ports[1].device.pad.gamepad_num = 4; | |
| 12 io_control_write(ports, 0x40, 0); | |
| 13 io_control_write(ports + 1, 0x40, 0); | |
| 14 gen->extra = ports; | |
| 15 } | |
| 16 | |
| 17 return gen->extra; | |
| 18 } | |
| 19 | |
| 20 void *jcart_write_w(uint32_t address, void *context, uint16_t value) | |
| 21 { | |
| 22 m68k_context *m68k= context; | |
| 23 io_port *ports = get_ports(m68k); | |
| 24 value = value << 6 & 0x40; | |
| 25 io_data_write(ports, value, m68k->current_cycle); | |
| 26 io_data_write(ports + 1, value, m68k->current_cycle); | |
| 27 return context; | |
| 28 } | |
| 29 | |
| 30 void *jcart_write_b(uint32_t address, void *context, uint8_t value) | |
| 31 { | |
| 32 if (address & 1) { | |
| 33 return jcart_write_w(address, context, value); | |
| 34 } | |
| 35 return context; | |
| 36 } | |
| 37 | |
| 38 uint16_t jcart_read_w(uint32_t address, void *context) | |
| 39 { | |
| 40 m68k_context *m68k= context; | |
| 41 io_port *ports = get_ports(m68k); | |
| 42 //according to Eke, bit 14 is forced low, at least on the Micro Machines 2 cart | |
| 43 //TODO: Test behavior of actual cart | |
|
1612
28ec17387be5
Remove stray / in jcart.c
Michael Pavone <pavone@retrodev.com>
parents:
1610
diff
changeset
|
44 uint16_t value = io_data_read(ports, m68k->current_cycle) << 8; |
| 1610 | 45 value |= io_data_read(ports + 1, m68k->current_cycle); |
| 46 return value; | |
| 47 } | |
| 48 | |
| 49 uint8_t jcart_read_b(uint32_t address, void *context) | |
| 50 { | |
| 51 m68k_context *m68k= context; | |
| 52 io_port *ports = get_ports(m68k); | |
| 53 return io_data_read(ports + (address & 1), m68k->current_cycle); | |
| 54 } | |
| 55 | |
| 56 void jcart_adjust_cycles(genesis_context *context, uint32_t deduction) | |
| 57 { | |
| 58 io_port *ports = get_ports(context->m68k); | |
| 59 io_adjust_cycles(ports, context->m68k->current_cycle, deduction); | |
| 60 io_adjust_cycles(ports + 1, context->m68k->current_cycle, deduction); | |
| 61 } | |
| 62 | |
| 63 void jcart_gamepad_down(genesis_context *context, uint8_t gamepad_num, uint8_t button) | |
| 64 { | |
| 65 io_port *ports = get_ports(context->m68k); | |
| 66 if (gamepad_num == ports[1].device.pad.gamepad_num) { | |
| 67 ports++; | |
| 68 } else if (gamepad_num != ports[0].device.pad.gamepad_num) { | |
| 69 ports = NULL; | |
| 70 } | |
| 71 if (ports) { | |
| 72 io_port_gamepad_down(ports, button); | |
| 73 } | |
| 74 } | |
| 75 | |
| 76 void jcart_gamepad_up(genesis_context *context, uint8_t gamepad_num, uint8_t button) | |
| 77 { | |
| 78 io_port *ports = get_ports(context->m68k); | |
| 79 if (gamepad_num == ports[1].device.pad.gamepad_num) { | |
| 80 ports++; | |
| 81 } else if (gamepad_num != ports[0].device.pad.gamepad_num) { | |
| 82 ports = NULL; | |
| 83 } | |
| 84 if (ports) { | |
| 85 io_port_gamepad_up(ports, button); | |
| 86 } | |
| 87 } |