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https://github.com/bsnes-emu/bsnes.git
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83f684c66c
byuu says: Note: for Windows users, please go to nall/intrinsics.hpp line 60 and correct the typo from "DISPLAY_WINDOW" to "DISPLAY_WINDOWS" before compiling, otherwise things won't work at all. This will be a really major WIP for the core SNES emulation, so please test as thoroughly as possible. I rewrote the 65816 CPU core's dispatcher from a jump table to a switch table. This was so that I could pass class variables as parameters to opcodes without crazy theatrics. With that, I killed the regs.r[N] stuff, the flag_t operator|=, &=, ^= stuff, and all of the template versions of opcodes. I also removed some stupid pointless flag tests in xcn and pflag that would always be true. I sure hope that AWJ is happy with this; because this change was so that my flag assignments and branch tests won't need to build regs.P into a full 8-bit variable anymore. It does of course incur a slight performance hit when you pass in variables by-value to functions, but it should help with binary size (and thus cache) by reducing a lot of extra functions. (I know I could have used template parameters for some things even with a switch table, but chose not to for the aforementioned reasons.) Overall, it's about a ~1% speedup from the previous build. The CPU core instructions were never a bottleneck, but I did want to fix the P flag building stuff because that really was a dumb mistake v_v'
119 lines
2.8 KiB
C++
119 lines
2.8 KiB
C++
#ifndef NALL_SERIAL_HPP
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#define NALL_SERIAL_HPP
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#include <nall/intrinsics.hpp>
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#include <nall/stdint.hpp>
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#include <nall/string.hpp>
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#if !defined(API_POSIX)
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#error "nall/serial: unsupported system"
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#endif
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <termios.h>
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#include <unistd.h>
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namespace nall {
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struct serial {
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bool readable() {
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if(port_open == false) return false;
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fd_set fdset;
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FD_ZERO(&fdset);
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FD_SET(port, &fdset);
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timeval timeout;
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timeout.tv_sec = 0;
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timeout.tv_usec = 0;
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int result = select(FD_SETSIZE, &fdset, nullptr, nullptr, &timeout);
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if(result < 1) return false;
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return FD_ISSET(port, &fdset);
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}
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//-1 on error, otherwise return bytes read
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int read(uint8_t* data, unsigned length) {
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if(port_open == false) return -1;
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return ::read(port, (void*)data, length);
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}
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bool writable() {
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if(port_open == false) return false;
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fd_set fdset;
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FD_ZERO(&fdset);
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FD_SET(port, &fdset);
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timeval timeout;
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timeout.tv_sec = 0;
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timeout.tv_usec = 0;
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int result = select(FD_SETSIZE, nullptr, &fdset, nullptr, &timeout);
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if(result < 1) return false;
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return FD_ISSET(port, &fdset);
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}
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//-1 on error, otherwise return bytes written
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int write(const uint8_t* data, unsigned length) {
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if(port_open == false) return -1;
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return ::write(port, (void*)data, length);
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}
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bool open(const string& portname, unsigned rate, bool flowcontrol) {
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close();
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port = ::open(portname, O_RDWR | O_NOCTTY | O_NDELAY | O_NONBLOCK);
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if(port == -1) return false;
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if(ioctl(port, TIOCEXCL) == -1) { close(); return false; }
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if(fcntl(port, F_SETFL, 0) == -1) { close(); return false; }
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if(tcgetattr(port, &original_attr) == -1) { close(); return false; }
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termios attr = original_attr;
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cfmakeraw(&attr);
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cfsetspeed(&attr, rate);
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attr.c_lflag &=~ (ECHO | ECHONL | ISIG | ICANON | IEXTEN);
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attr.c_iflag &=~ (BRKINT | PARMRK | INPCK | ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXOFF | IXANY);
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attr.c_iflag |= (IGNBRK | IGNPAR);
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attr.c_oflag &=~ (OPOST);
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attr.c_cflag &=~ (CSIZE | CSTOPB | PARENB | CLOCAL);
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attr.c_cflag |= (CS8 | CREAD);
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if(flowcontrol == false) {
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attr.c_cflag &= ~CRTSCTS;
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} else {
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attr.c_cflag |= CRTSCTS;
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}
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attr.c_cc[VTIME] = attr.c_cc[VMIN] = 0;
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if(tcsetattr(port, TCSANOW, &attr) == -1) { close(); return false; }
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return port_open = true;
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}
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void close() {
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if(port != -1) {
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tcdrain(port);
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if(port_open == true) {
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tcsetattr(port, TCSANOW, &original_attr);
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port_open = false;
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}
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::close(port);
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port = -1;
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}
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}
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serial() {
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port = -1;
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port_open = false;
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}
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~serial() {
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close();
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}
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private:
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int port;
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bool port_open;
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termios original_attr;
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};
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}
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#endif
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