Zack Buhman
511d99563d
From the GCC manual.
> GCC permits a C structure to have no members:
struct empty {
};
> The structure has size zero. In C++, empty structures are part of the
> language. G++ treats empty structures as if they had a single member of type
> char.
I was not aware of the different behavior in C++.
This fixes every maple example--most were broken for multiple reasons, including
this one.
This also enables SH4 caching. This includes linking code/data into the P1
area (previously this was not the case).
The maple examples (which indeed involve much use of DMA) require much work to
successfully work with the operand and copyback caches. The vibration example
currently is the most complete, though I should consider more on how I want to
structure maple response operand cache invalidation more generally.
112 lines
3.4 KiB
C++
112 lines
3.4 KiB
C++
#include <bit>
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#include "vga.hpp"
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#include "align.hpp"
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#include "maple/maple.hpp"
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#include "maple/maple_impl.hpp"
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#include "maple/maple_bus_bits.hpp"
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#include "maple/maple_bus_commands.hpp"
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#include "maple/maple_bus_ft0.hpp"
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#include "sh7091/serial.hpp"
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uint32_t _command_buf[1024 / 4 + 32] = {0};
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uint32_t _receive_buf[1024 / 4 + 32] = {0};
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static uint32_t * command_buf;
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static uint32_t * receive_buf;
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void do_get_condition(uint32_t port)
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{
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uint32_t destination_port;
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uint32_t destination_ap;
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switch (port) {
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case 0:
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destination_port = host_instruction::port_select::a;
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destination_ap = ap::de::device | ap::port_select::a;
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break;
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case 1:
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destination_port = host_instruction::port_select::b;
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destination_ap = ap::de::device | ap::port_select::b;
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break;
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case 2:
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destination_port = host_instruction::port_select::c;
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destination_ap = ap::de::device | ap::port_select::c;
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break;
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case 3:
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destination_port = host_instruction::port_select::d;
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destination_ap = ap::de::device | ap::port_select::d;
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break;
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default:
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return;
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}
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const uint32_t size = maple::init_get_condition(command_buf, receive_buf,
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destination_port,
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destination_ap,
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std::byteswap(function_type::controller));
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maple::dma_start(command_buf, size);
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using response_type = data_transfer<ft0::data_transfer::data_format>;
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using command_response_type = struct maple::command_response<response_type::data_fields>;
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auto response = reinterpret_cast<command_response_type *>(receive_buf);
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auto& bus_data = response->bus_data;
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if (bus_data.command_code != response_type::command_code) {
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return;
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}
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auto& data_fields = bus_data.data_fields;
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if ((data_fields.function_type & std::byteswap(function_type::controller)) == 0) {
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return;
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}
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bool a = ft0::data_transfer::digital_button::a(data_fields.data.digital_button);
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if (a == 0) {
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serial::string("port ");
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serial::integer<uint8_t>(port);
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serial::string(" `a` press ");
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serial::integer<uint8_t>(a);
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}
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}
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void do_device_request()
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{
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using command_type = device_request;
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using response_type = device_status;
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const uint32_t size = maple::init_host_command_all_ports<command_type, response_type>(command_buf, receive_buf);
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maple::dma_start(command_buf, size * 10);
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using command_response_type = struct maple::command_response<response_type::data_fields>;
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auto response = reinterpret_cast<command_response_type *>(receive_buf);
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for (uint8_t port = 0; port < 4; port++) {
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auto& bus_data = response[port].bus_data;
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auto& data_fields = response[port].bus_data.data_fields;
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if (bus_data.command_code != device_status::command_code) {
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// the controller is disconnected
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} else {
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if ((data_fields.device_id.ft & std::byteswap(function_type::controller)) != 0) {
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//serial::string("is controller: ");
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//serial::integer<uint8_t>(port);
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do_get_condition(port);
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}
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}
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}
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}
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void main()
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{
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command_buf = align_32byte(_command_buf);
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command_buf = reinterpret_cast<uint32_t *>(reinterpret_cast<uint32_t>(command_buf) | 0xa000'0000);
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receive_buf = align_32byte(_receive_buf);
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// flycast needs this in HLE mode, or else it won't start the vcount
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// counter.
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vga();
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while (1) {
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v_sync_in();
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do_device_request();
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};
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}
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