afterburner/serial_port.h

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C
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#ifndef _SERIAL_PORT_H_
#define _SERIAL_PORT_H_
#ifdef _USE_WIN_API_
#include <windows.h>
#define SerialDeviceHandle HANDLE
#define DEFAULT_SERIAL_DEVICE_NAME "COM1"
#define INVALID_HANDLE INVALID_HANDLE_VALUE
// 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_38400; // Setting BaudRate = 38400
dcbSerialParams.ByteSize = 8; // Setting ByteSize = 8
dcbSerialParams.StopBits = ONESTOPBIT;// Setting StopBits = 1
dcbSerialParams.Parity = NOPARITY; // Setting Parity = None
result = SetCommState(h, &dcbSerialParams);
if (!result) {
return INVALID_HANDLE;
}
timeouts.ReadIntervalTimeout = 50; // in milliseconds
timeouts.ReadTotalTimeoutConstant = 50; // 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;
}
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
static inline SerialDeviceHandle serialDeviceOpen(char* deviceName) {
SerialDeviceHandle h;
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, B38400);
cfsetospeed(&serial, B38400);
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
return h;
} else {
return INVALID_HANDLE;
}
}
void serialDeviceCheckName(char* name, int maxSize) {
//nothing to check
}
static inline void serialDeviceClose(SerialDeviceHandle deviceHandle) {
close(deviceHandle);
}
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_ */