/*
- * Proxmark3 generic uart / rs232/ serial port library
+ * Generic uart / rs232/ serial port library
*
- * Copyright (c) 2012, Roel Verdult
+ * Copyright (c) 2013, Roel Verdult
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* @file uart.c
* @brief
*
- * Partly based on uart-code written by Teunis van Beelen, available:
- * http://www.teuniz.net/RS-232/index.html
- *
*/
#include "uart.h"
-#include "messages.h"
// Test if we are dealing with unix operating systems
#ifndef _WIN32
} serial_port_unix;
// Set time-out on 30 miliseconds
-const struct timeval timeout = {
+const struct timeval timeout = {
.tv_sec = 0, // 0 second
.tv_usec = 30000 // 30000 micro seconds
};
-// Work-around to claim uart interface using the c_iflag (software input processing) from the termios struct
-#define CCLAIMED 0x80000000
-
serial_port uart_open(const char* pcPortName)
{
serial_port_unix* sp = malloc(sizeof(serial_port_unix));
-
if (sp == 0) return INVALID_SERIAL_PORT;
-
+
sp->fd = open(pcPortName, O_RDWR | O_NOCTTY | O_NDELAY | O_NONBLOCK);
- if(sp->fd == -1)
- {
+ if(sp->fd == -1) {
uart_close(sp);
return INVALID_SERIAL_PORT;
}
- if(tcgetattr(sp->fd,&sp->tiOld) == -1)
- {
- uart_close(sp);
- return INVALID_SERIAL_PORT;
+ // Finally figured out a way to claim a serial port interface under unix
+ // We just try to set a (advisory) lock on the file descriptor
+ struct flock fl;
+ fl.l_type = F_WRLCK;
+ fl.l_whence = SEEK_SET;
+ fl.l_start = 0;
+ fl.l_len = 0;
+ fl.l_pid = getpid();
+
+ // Does the system allows us to place a lock on this file descriptor
+ if (fcntl(sp->fd, F_SETLK, &fl) == -1) {
+ // A conflicting lock is held by another process
+ return CLAIMED_SERIAL_PORT;
}
- // Make sure the port is not claimed already
- if (sp->tiOld.c_iflag & CCLAIMED)
- {
+ // Try to retrieve the old (current) terminal info struct
+ if(tcgetattr(sp->fd,&sp->tiOld) == -1) {
uart_close(sp);
- return CLAIMED_SERIAL_PORT;
+ return INVALID_SERIAL_PORT;
}
-
- // Copy the old terminal info struct
+
+ // Duplicate the (old) terminal info struct
sp->tiNew = sp->tiOld;
-
+
+ // Configure the serial port
sp->tiNew.c_cflag = CS8 | CLOCAL | CREAD;
- sp->tiNew.c_iflag = CCLAIMED | IGNPAR;
+ sp->tiNew.c_iflag = IGNPAR;
sp->tiNew.c_oflag = 0;
sp->tiNew.c_lflag = 0;
-
- sp->tiNew.c_cc[VMIN] = 0; // block until n bytes are received
- sp->tiNew.c_cc[VTIME] = 0; // block until a timer expires (n * 100 mSec.)
-
- if(tcsetattr(sp->fd,TCSANOW,&sp->tiNew) == -1)
- {
+
+ // Block until n bytes are received
+ sp->tiNew.c_cc[VMIN] = 0;
+ // Block until a timer expires (n * 100 mSec.)
+ sp->tiNew.c_cc[VTIME] = 0;
+
+ // Try to set the new terminal info struct
+ if(tcsetattr(sp->fd,TCSANOW,&sp->tiNew) == -1) {
uart_close(sp);
return INVALID_SERIAL_PORT;
}
+
+ // Flush all lingering data that may exist
+ tcflush(sp->fd, TCIOFLUSH);
- tcflush(sp->fd, TCIFLUSH);
return sp;
}
-void uart_set_speed(serial_port sp, const uint32_t uiPortSpeed)
-{
- DBG("Serial port speed requested to be set to %d bauds.", uiPortSpeed);
- // Set port speed (Input and Output)
- speed_t stPortSpeed = B9600;
- switch(uiPortSpeed) {
- case 9600: stPortSpeed = B9600;
- break;
- case 19200: stPortSpeed = B19200;
- break;
- case 38400: stPortSpeed = B38400;
- break;
- case 57600: stPortSpeed = B57600;
- break;
- case 115200: stPortSpeed = B115200;
- break;
- case 230400: stPortSpeed = B230400;
- break;
-#ifdef B460800
- case 460800: stPortSpeed = B460800;
- break;
-#endif
- default:
-#ifdef B460800
- ERR("Unable to set serial port speed to %d bauds. Speed value must be one of these constants: 9600 (default), 19200, 38400, 57600, 115200, 230400 or 460800.", uiPortSpeed);
-#else
- ERR("Unable to set serial port speed to %d bauds. Speed value must be one of these constants: 9600 (default), 19200, 38400, 57600, 115200 or 230400.", uiPortSpeed);
-#endif
+void uart_close(const serial_port sp) {
+ serial_port_unix* spu = (serial_port_unix*)sp;
+ tcflush(spu->fd,TCIOFLUSH);
+ tcsetattr(spu->fd,TCSANOW,&(spu->tiOld));
+ struct flock fl;
+ fl.l_type = F_UNLCK;
+ fl.l_whence = SEEK_SET;
+ fl.l_start = 0;
+ fl.l_len = 0;
+ fl.l_pid = getpid();
+ fcntl(spu->fd, F_SETLK, &fl);
+ close(spu->fd);
+ free(sp);
+}
+
+bool uart_set_speed(serial_port sp, const uint32_t uiPortSpeed) {
+ const serial_port_unix* spu = (serial_port_unix*)sp;
+ speed_t stPortSpeed;
+ switch (uiPortSpeed) {
+ case 0: stPortSpeed = B0; break;
+ case 50: stPortSpeed = B50; break;
+ case 75: stPortSpeed = B75; break;
+ case 110: stPortSpeed = B110; break;
+ case 134: stPortSpeed = B134; break;
+ case 150: stPortSpeed = B150; break;
+ case 300: stPortSpeed = B300; break;
+ case 600: stPortSpeed = B600; break;
+ case 1200: stPortSpeed = B1200; break;
+ case 1800: stPortSpeed = B1800; break;
+ case 2400: stPortSpeed = B2400; break;
+ case 4800: stPortSpeed = B4800; break;
+ case 9600: stPortSpeed = B9600; break;
+ case 19200: stPortSpeed = B19200; break;
+ case 38400: stPortSpeed = B38400; break;
+# ifdef B57600
+ case 57600: stPortSpeed = B57600; break;
+# endif
+# ifdef B115200
+ case 115200: stPortSpeed = B115200; break;
+# endif
+# ifdef B230400
+ case 230400: stPortSpeed = B230400; break;
+# endif
+# ifdef B460800
+ case 460800: stPortSpeed = B460800; break;
+# endif
+# ifdef B921600
+ case 921600: stPortSpeed = B921600; break;
+# endif
+ default: return false;
};
+ struct termios ti;
+ if (tcgetattr(spu->fd,&ti) == -1) return false;
+ // Set port speed (Input and Output)
+ cfsetispeed(&ti,stPortSpeed);
+ cfsetospeed(&ti,stPortSpeed);
+ return (tcsetattr(spu->fd,TCSANOW,&ti) != -1);
+}
+
+uint32_t uart_get_speed(const serial_port sp) {
+ struct termios ti;
+ uint32_t uiPortSpeed;
const serial_port_unix* spu = (serial_port_unix*)sp;
- cfsetispeed((struct termios*)&spu->tiNew, stPortSpeed);
- cfsetospeed((struct termios*)&spu->tiNew, stPortSpeed);
- if( tcsetattr(spu->fd, TCSADRAIN, &spu->tiNew) == -1)
- {
- ERR("Unable to apply new speed settings.");
- }
+ if (tcgetattr(spu->fd,&ti) == -1) return 0;
+ // Set port speed (Input)
+ speed_t stPortSpeed = cfgetispeed(&ti);
+ switch (stPortSpeed) {
+ case B0: uiPortSpeed = 0; break;
+ case B50: uiPortSpeed = 50; break;
+ case B75: uiPortSpeed = 75; break;
+ case B110: uiPortSpeed = 110; break;
+ case B134: uiPortSpeed = 134; break;
+ case B150: uiPortSpeed = 150; break;
+ case B300: uiPortSpeed = 300; break;
+ case B600: uiPortSpeed = 600; break;
+ case B1200: uiPortSpeed = 1200; break;
+ case B1800: uiPortSpeed = 1800; break;
+ case B2400: uiPortSpeed = 2400; break;
+ case B4800: uiPortSpeed = 4800; break;
+ case B9600: uiPortSpeed = 9600; break;
+ case B19200: uiPortSpeed = 19200; break;
+ case B38400: uiPortSpeed = 38400; break;
+# ifdef B57600
+ case B57600: uiPortSpeed = 57600; break;
+# endif
+# ifdef B115200
+ case B115200: uiPortSpeed = 115200; break;
+# endif
+# ifdef B230400
+ case B230400: uiPortSpeed = 230400; break;
+# endif
+# ifdef B460800
+ case B460800: uiPortSpeed = 460800; break;
+# endif
+# ifdef B921600
+ case B921600: uiPortSpeed = 921600; break;
+# endif
+ default: return 0;
+ };
+ return uiPortSpeed;
}
-uint32_t uart_get_speed(const serial_port sp)
-{
- uint32_t uiPortSpeed = 0;
+bool uart_set_parity(serial_port sp, serial_port_parity spp) {
+ struct termios ti;
const serial_port_unix* spu = (serial_port_unix*)sp;
- switch (cfgetispeed(&spu->tiNew))
- {
- case B9600: uiPortSpeed = 9600;
- break;
- case B19200: uiPortSpeed = 19200;
- break;
- case B38400: uiPortSpeed = 38400;
- break;
- case B57600: uiPortSpeed = 57600;
- break;
- case B115200: uiPortSpeed = 115200;
- break;
- case B230400: uiPortSpeed = 230400;
- break;
-#ifdef B460800
- case B460800: uiPortSpeed = 460800;
- break;
-#endif
+ if (tcgetattr(spu->fd,&ti) == -1) return false;
+ switch(spp) {
+ case SP_INVALID: return false;
+ case SP_NONE: ti.c_cflag &= ~(PARENB | PARODD); break;
+ case SP_EVEN: ti.c_cflag |= PARENB; ti.c_cflag &= ~(PARODD); break;
+ case SP_ODD: ti.c_cflag |= PARENB | PARODD; break;
}
-
- return uiPortSpeed;
+ return (tcsetattr(spu->fd,TCSANOW,&ti) != -1);
}
-void uart_close(const serial_port sp)
-{
- tcsetattr(((serial_port_unix*)sp)->fd,TCSANOW,&((serial_port_unix*)sp)->tiOld);
- close(((serial_port_unix*)sp)->fd);
- free(sp);
+serial_port_parity uart_get_parity(const serial_port sp) {
+ struct termios ti;
+ const serial_port_unix* spu = (serial_port_unix*)sp;
+ if (tcgetattr(spu->fd,&ti) == -1) return SP_INVALID;
+
+ if (ti.c_cflag & PARENB) {
+ if (ti.c_cflag & PARODD) {
+ return SP_ODD;
+ } else {
+ return SP_EVEN;
+ }
+ } else {
+ return SP_NONE;
+ }
}
-bool uart_cts(const serial_port sp)
-{
+bool uart_cts(const serial_port sp) {
char status;
if (ioctl(((serial_port_unix*)sp)->fd,TIOCMGET,&status) < 0) return false;
return (status & TIOCM_CTS);
}
-bool uart_receive(const serial_port sp, byte_t* pbtRx, size_t* pszRxLen)
-{
+bool uart_receive(const serial_port sp, byte_t* pbtRx, size_t* pszRxLen) {
+
int res;
int byteCount;
fd_set rfds;
struct timeval tv;
-
- // Reset the output count
+
+ // Reset the output count
*pszRxLen = 0;
-
+
do {
// Reset file descriptor
FD_ZERO(&rfds);
FD_SET(((serial_port_unix*)sp)->fd,&rfds);
tv = timeout;
res = select(((serial_port_unix*)sp)->fd+1, &rfds, NULL, NULL, &tv);
-
+
// Read error
if (res < 0) {
- DBG("RX error.");
return false;
}
-
+
// Read time-out
if (res == 0) {
if (*pszRxLen == 0) {
// Error, we received no data
- DBG("RX time-out, buffer empty.");
return false;
} else {
// We received some data, but nothing more is available
return true;
}
}
-
+
// Retrieve the count of the incoming bytes
res = ioctl(((serial_port_unix*)sp)->fd, FIONREAD, &byteCount);
if (res < 0) return false;
-
+
// There is something available, read the data
res = read(((serial_port_unix*)sp)->fd,pbtRx+(*pszRxLen),byteCount);
-
+
// Stop if the OS has some troubles reading the data
if (res <= 0) return false;
-
+
*pszRxLen += res;
-
+
} while (byteCount);
-
+
return true;
}
-bool uart_send(const serial_port sp, const byte_t* pbtTx, const size_t szTxLen)
-{
+bool uart_send(const serial_port sp, const byte_t* pbtTx, const size_t szTxLen) {
int32_t res;
size_t szPos = 0;
fd_set rfds;
struct timeval tv;
-
- while (szPos < szTxLen)
- {
+
+ while (szPos < szTxLen) {
// Reset file descriptor
FD_ZERO(&rfds);
FD_SET(((serial_port_unix*)sp)->fd,&rfds);
tv = timeout;
res = select(((serial_port_unix*)sp)->fd+1, NULL, &rfds, NULL, &tv);
-
+
// Write error
if (res < 0) {
- DBG("TX error.");
return false;
}
-
+
// Write time-out
if (res == 0) {
- DBG("TX time-out.");
return false;
}
-
+
// Send away the bytes
res = write(((serial_port_unix*)sp)->fd,pbtTx+szPos,szTxLen-szPos);
// Stop if the OS has some troubles sending the data
if (res <= 0) return false;
-
+
szPos += res;
}
return true;
#else
// The windows serial port implementation
-typedef struct {
+typedef struct {
HANDLE hPort; // Serial port handle
DCB dcb; // Device control settings
COMMTIMEOUTS ct; // Serial port time-out configuration
} serial_port_windows;
void upcase(char *p) {
- while(*p != '\0') {
- if(*p >= 97 && *p <= 122) {
- *p -= 32;
+ while(*p != '\0') {
+ if(*p >= 97 && *p <= 122) {
+ *p -= 32;
}
- ++p;
- }
+ ++p;
+ }
}
-serial_port uart_open(const char* pcPortName)
-{
+serial_port uart_open(const char* pcPortName) {
char acPortName[255];
serial_port_windows* sp = malloc(sizeof(serial_port_windows));
-
+
// Copy the input "com?" to "\\.\COM?" format
sprintf(acPortName,"\\\\.\\%s",pcPortName);
upcase(acPortName);
-
+
// Try to open the serial port
sp->hPort = CreateFileA(acPortName,GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING,0,NULL);
- if (sp->hPort == INVALID_HANDLE_VALUE)
- {
+ if (sp->hPort == INVALID_HANDLE_VALUE) {
uart_close(sp);
return INVALID_SERIAL_PORT;
}
-
+
// Prepare the device control
memset(&sp->dcb, 0, sizeof(DCB));
sp->dcb.DCBlength = sizeof(DCB);
- if(!BuildCommDCBA("baud=9600 data=8 parity=N stop=1",&sp->dcb))
- {
+ if(!BuildCommDCBA("baud=9600 data=8 parity=N stop=1",&sp->dcb)) {
uart_close(sp);
return INVALID_SERIAL_PORT;
}
-
+
// Update the active serial port
- if(!SetCommState(sp->hPort,&sp->dcb))
- {
+ if(!SetCommState(sp->hPort,&sp->dcb)) {
uart_close(sp);
return INVALID_SERIAL_PORT;
}
-
+
sp->ct.ReadIntervalTimeout = 0;
sp->ct.ReadTotalTimeoutMultiplier = 0;
sp->ct.ReadTotalTimeoutConstant = 30;
sp->ct.WriteTotalTimeoutMultiplier = 0;
sp->ct.WriteTotalTimeoutConstant = 30;
-
- if(!SetCommTimeouts(sp->hPort,&sp->ct))
- {
+
+ if(!SetCommTimeouts(sp->hPort,&sp->ct)) {
uart_close(sp);
return INVALID_SERIAL_PORT;
}
-
+
PurgeComm(sp->hPort, PURGE_RXABORT | PURGE_RXCLEAR);
-
+
return sp;
}
-void uart_close(const serial_port sp)
-{
+void uart_close(const serial_port sp) {
CloseHandle(((serial_port_windows*)sp)->hPort);
free(sp);
}
-void uart_set_speed(serial_port sp, const uint32_t uiPortSpeed)
-{
+bool uart_set_speed(serial_port sp, const uint32_t uiPortSpeed) {
serial_port_windows* spw;
-
- DBG("Serial port speed requested to be set to %d bauds.", uiPortSpeed);
- // Set port speed (Input and Output)
- switch(uiPortSpeed) {
- case 9600:
- case 19200:
- case 38400:
- case 57600:
- case 115200:
- case 230400:
- case 460800:
- break;
- default:
- ERR("Unable to set serial port speed to %d bauds. Speed value must be one of these constants: 9600 (default), 19200, 38400, 57600, 115200, 230400 or 460800.", uiPortSpeed);
- };
-
spw = (serial_port_windows*)sp;
spw->dcb.BaudRate = uiPortSpeed;
- if (!SetCommState(spw->hPort, &spw->dcb))
- {
- ERR("Unable to apply new speed settings.");
- }
+ return SetCommState(spw->hPort, &spw->dcb);
}
-uint32_t uart_get_speed(const serial_port sp)
-{
+uint32_t uart_get_speed(const serial_port sp) {
const serial_port_windows* spw = (serial_port_windows*)sp;
- if (!GetCommState(spw->hPort, (serial_port)&spw->dcb))
+ if (!GetCommState(spw->hPort, (serial_port)&spw->dcb)) {
return spw->dcb.BaudRate;
-
+ }
return 0;
}
-bool uart_receive(const serial_port sp, byte_t* pbtRx, size_t* pszRxLen)
-{
+bool uart_receive(const serial_port sp, byte_t* pbtRx, size_t* pszRxLen) {
ReadFile(((serial_port_windows*)sp)->hPort,pbtRx,*pszRxLen,(LPDWORD)pszRxLen,NULL);
return (*pszRxLen != 0);
}
-bool uart_send(const serial_port sp, const byte_t* pbtTx, const size_t szTxLen)
-{
+bool uart_send(const serial_port sp, const byte_t* pbtTx, const size_t szTxLen) {
DWORD dwTxLen = 0;
return WriteFile(((serial_port_windows*)sp)->hPort,pbtTx,szTxLen,&dwTxLen,NULL);
return (dwTxLen != 0);
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