afterburner/src_pc/serial_port.h

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#ifndef _SERIAL_PORT_H_
#define _SERIAL_PORT_H_
char guessedSerialDevice[512] = {0};
#ifdef _USE_WIN_API_
#include <windows.h>
#define SerialDeviceHandle HANDLE
#define DEFAULT_SERIAL_DEVICE_NAME "COM1"
#define INVALID_HANDLE INVALID_HANDLE_VALUE
// ideas: https://stackoverflow.com/questions/1388871/how-do-i-get-a-list-of-available-serial-ports-in-win32
static void serialDeviceGuessName(char** deviceName) {
char buf[64 * 1024] = {0};
int size = QueryDosDevice(NULL, buf, 64 * 1024);
int topComNum = 0;
// buffer was filled in
if (size > 0) {
char* text = buf;
int pos = 0;
int start = 0;
// search the received buffer for COM string
while (pos < size) {
int nameLen;
start = pos;
// find the string terminator
while(pos < size && buf[pos] != 0) {
pos++;
}
nameLen = pos - start;
// COM port found
if (nameLen >= 4 && nameLen <=6 && 0 == strncmp(text, "COM", 3) && text[3] >= '0' && text[3] <= '9') {
int comNum = atoi(text + 3);
if (comNum > topComNum) {
topComNum = comNum;
strcpy(guessedSerialDevice, text);
}
}
pos++;
text = &buf[pos];
}
// if we have found a COM port then pass it back as the result
if (topComNum > 0) {
*deviceName = guessedSerialDevice;
}
}
}
// https://www.xanthium.in/Serial-Port-Programming-using-Win32-API
static inline SerialDeviceHandle serialDeviceOpen(char* deviceName) {
SerialDeviceHandle h;
h = CreateFile(
deviceName, //port name
GENERIC_READ | GENERIC_WRITE, //Read/Write
0, // No Sharing
NULL, // No Security
OPEN_EXISTING,// Open existing port only
0, // Non Overlapped I/O
NULL); // Null for Comm Devices
if (h != INVALID_HANDLE) {
BOOL result;
COMMTIMEOUTS timeouts = { 0 };
DCB dcbSerialParams = { 0 }; // Initializing DCB structure
dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
result = GetCommState(h, &dcbSerialParams);
if (!result) {
return INVALID_HANDLE;
}
dcbSerialParams.BaudRate = CBR_57600; // Setting BaudRate
dcbSerialParams.ByteSize = 8; // Setting ByteSize = 8
dcbSerialParams.StopBits = ONESTOPBIT;// Setting StopBits = 1
dcbSerialParams.Parity = NOPARITY; // Setting Parity = None
dcbSerialParams.fOutxCtsFlow = FALSE;
dcbSerialParams.fOutxDsrFlow = FALSE;
dcbSerialParams.fDtrControl = DTR_CONTROL_DISABLE;
dcbSerialParams.fOutX = FALSE;
dcbSerialParams.fInX = FALSE;
dcbSerialParams.fRtsControl = RTS_CONTROL_DISABLE;
dcbSerialParams.fBinary = TRUE;
result = SetCommState(h, &dcbSerialParams);
if (!result) {
return INVALID_HANDLE;
}
timeouts.ReadIntervalTimeout = 30; // in milliseconds
timeouts.ReadTotalTimeoutConstant = 30; // in milliseconds
timeouts.ReadTotalTimeoutMultiplier = 10; // in milliseconds
timeouts.WriteTotalTimeoutConstant = 50; // in milliseconds
timeouts.WriteTotalTimeoutMultiplier = 10; // in milliseconds
result = SetCommTimeouts(h, &timeouts);
if (!result) {
return INVALID_HANDLE;
}
//ensure no leftover bytes exist on the serial line
result = PurgeComm(h, PURGE_RXCLEAR | PURGE_TXCLEAR | PURGE_RXABORT | PURGE_TXABORT);
return h;
} else {
return INVALID_HANDLE;
}
}
void serialDeviceCheckName(char* name, int maxSize) {
int nameLen = strlen(name);
//convert comxx to COMxx
if (strncmp(name, "com", 3) == 0 && (nameLen > 3 && name[3] >= '0' && name[3] <= '9')) {
name[0] = 'C';
name[1] = 'O';
name[2] = 'M';
}
// convert COMxx and higher to \\\\.\\COMxx
if (strncmp(name, "COM", 3) == 0 && (nameLen > 4 && name[3] >= '0' && name[3] <= '9')) {
if (nameLen + 4 < maxSize) {
int i;
for (i = nameLen - 1; i >= 0; i--) {
name[ i + 4] = name[i];
}
name[0] = '\\';
name[1] = '\\';
name[2] = '.';
name[3] = '\\';
}
}
}
static inline void serialDeviceClose(SerialDeviceHandle deviceHandle) {
CloseHandle(deviceHandle);
}
static inline int serialDeviceWrite(SerialDeviceHandle deviceHandle, char* buffer, int bytesToWrite) {
DWORD written = 0;
WriteFile(deviceHandle, buffer, bytesToWrite, &written, NULL);
return (int) written;
}
static inline int serialDeviceRead(SerialDeviceHandle deviceHandle, char* buffer, int bytesToRead) {
DWORD read = 0;
ReadFile(deviceHandle, buffer, bytesToRead, &read, NULL);
return (int) read;
}
#else
#include <ctype.h>
#include <fcntl.h>
#include <errno.h>
#include <termios.h>
#define SerialDeviceHandle int
#define DEFAULT_SERIAL_DEVICE_NAME "/dev/ttyUSB0"
#define INVALID_HANDLE -1
#ifdef NO_CLOSE
static SerialDeviceHandle serH = INVALID_HANDLE;
#endif
#ifdef _OSX_
#define CHECK_SERIAL() (text != NULL)
#define LIST_DEVICES "ls -1 /dev/tty.usb* /dev/tty.wchusb* 2>/dev/null"
#else
#define CHECK_SERIAL() (text != NULL && 0 == strncmp(text + 18, "usb-", 4))
#define LIST_DEVICES "ls -1 /dev/serial/by-id/* 2>/dev/null"
#endif
// ideas: https://unix.stackexchange.com/questions/647235/debian-how-to-identify-usb-devices-with-similar-dev-tty-file
// https://pubs.opengroup.org/onlinepubs/009696799/functions/popen.html
static void serialDeviceGuessName(char** deviceName) {
int i;
char text[512];
int topTtyNum = 0;
FILE* f = popen(LIST_DEVICES, "r");
if (f == NULL) {
return;
}
i = 1;
while (fgets(text, 512, f) != NULL) {
// filer out non USB devices and prioritise those with Arduino name
if (CHECK_SERIAL()) {
int ttyNum = i;
int textLen = strlen(text);
// prefer Arduino over generic USB serial ports (does not work on OSX)
if (textLen > 29 && 0 == strncmp(text + 18, "usb-Arduino", 11)) {
ttyNum += 1000;
}
if (ttyNum > topTtyNum) {
topTtyNum = ttyNum;
strcpy(guessedSerialDevice, text);
//strip the new-line trailing markers
if (guessedSerialDevice[textLen - 1] == '\n' || guessedSerialDevice[textLen - 1] == '\r') {
guessedSerialDevice[textLen - 1] = 0;
}
}
}
i++;
}
pclose(f);
if (topTtyNum > 0) {
*deviceName = guessedSerialDevice;
}
}
static inline SerialDeviceHandle serialDeviceOpen(char* deviceName) {
SerialDeviceHandle h;
#ifdef NO_CLOSE
if (serH != INVALID_HANDLE) {
return serH;
}
#endif
h = open(deviceName, O_RDWR | O_NOCTTY | O_NONBLOCK);
if (h != INVALID_HANDLE) {
//set the serial port parameters
struct termios serial;
memset(&serial, 0, sizeof(struct termios));
cfsetispeed(&serial, B57600);
cfsetospeed(&serial, B57600);
serial.c_cflag |= CS8; // no parity, 1 stop bit
serial.c_cflag |= CREAD | CLOCAL;
if (0 != tcsetattr(h, TCSANOW, &serial)) {
close(h);
printf("Error: failed to set serial parameters %i, %s\n", errno, strerror(errno));
return INVALID_HANDLE;
}
//ensure no leftover bytes exist on the serial line
tcdrain(h);
tcflush(h, TCIOFLUSH); //flush both queues
#ifdef NO_CLOSE
serH = h;
#endif
return h;
} else {
return INVALID_HANDLE;
}
}
void serialDeviceCheckName(char* name, int maxSize) {
//nothing to check
}
static inline void serialDeviceClose(SerialDeviceHandle deviceHandle) {
#ifndef NO_CLOSE
close(deviceHandle);
#endif
}
static inline int serialDeviceWrite(SerialDeviceHandle deviceHandle, char* buffer, int bytesToWrite) {
return write(deviceHandle, buffer, bytesToWrite);
}
static inline int serialDeviceRead(SerialDeviceHandle deviceHandle, char* buffer, int bytesToRead) {
return read(deviceHandle, buffer, bytesToRead);
}
#endif
#endif /* _SERIAL_PORT_H_ */