113 lines
2.9 KiB
C++
113 lines
2.9 KiB
C++
#pragma once
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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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~serial() {
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close();
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}
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auto readable() -> bool {
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if(!opened) 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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auto read(uint8_t* data, uint length) -> int {
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if(!opened) return -1;
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return ::read(port, (void*)data, length);
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}
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auto writable() -> bool {
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if(!opened) 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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auto write(const uint8_t* data, uint length) -> int {
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if(!opened) return -1;
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return ::write(port, (void*)data, length);
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}
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//rate==0: use flow control (synchronous mode)
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//rate!=0: baud-rate (asynchronous mode)
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auto open(string device, uint rate = 0) -> bool {
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close();
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if(!device) device = "/dev/ttyU0"; //note: default device name is for FreeBSD 10+
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port = ::open(device, 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 ? rate : 57600); //rate value has no effect in synchronous mode
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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(rate) {
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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 opened = true;
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}
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auto close() -> void {
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if(port != -1) {
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tcdrain(port);
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if(opened) {
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tcsetattr(port, TCSANOW, &original_attr);
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opened = 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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private:
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int port = -1;
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bool opened = false;
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termios original_attr;
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};
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}
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