From 835823809fbd67bbde471c38373c490c107bad10 Mon Sep 17 00:00:00 2001 From: Romuald Conty Date: Wed, 17 Nov 2010 08:48:03 +0000 Subject: [PATCH] Split UART implementations: POSIX and Windows It could ease to port to other system like MiKey and it should be easy to track which is the concerned OS while uart driver is modified. --- libnfc/buses/uart.c | 426 +------------------------------------- libnfc/buses/uart.h | 9 +- libnfc/buses/uart_posix.c | 298 ++++++++++++++++++++++++++ libnfc/buses/uart_win32.c | 164 +++++++++++++++ 4 files changed, 467 insertions(+), 430 deletions(-) create mode 100644 libnfc/buses/uart_posix.c create mode 100644 libnfc/buses/uart_win32.c diff --git a/libnfc/buses/uart.c b/libnfc/buses/uart.c index d9ec57e..3770ccf 100644 --- a/libnfc/buses/uart.c +++ b/libnfc/buses/uart.c @@ -20,16 +20,9 @@ /** * @file uart.c - * @brief UART driver - * - * This file contains 2 implementations of UART driver: first for POSIX systems, second for Windows system. + * @brief UART driver wrapper */ -/* -Based on RS232 code written by Teunis van Beelen available: -http://www.teuniz.net/RS-232/index.html -*/ - #ifdef HAVE_CONFIG_H # include "config.h" #endif // HAVE_CONFIG_H @@ -41,420 +34,9 @@ http://www.teuniz.net/RS-232/index.html // Test if we are dealing with unix operating systems #ifndef _WIN32 - -# include -# include -typedef struct termios term_info; -typedef struct { - int fd; // Serial port file descriptor - term_info tiOld; // Terminal info before using the port - term_info tiNew; // Terminal info during the transaction -} serial_port_unix; - -// timeval struct that define timeout delay for serial port -static struct timeval default_timeout = { - .tv_sec = 0, // 0 second - .tv_usec = 60000 // 60 ms -}; - -// 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_NONBLOCK); - 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; - } - // Make sure the port is not claimed already - if (sp->tiOld.c_iflag & CCLAIMED) { - uart_close (sp); - return CLAIMED_SERIAL_PORT; - } - // Copy the old terminal info struct - sp->tiNew = sp->tiOld; - - sp->tiNew.c_cflag = CS8 | CLOCAL | CREAD; - sp->tiNew.c_iflag = CCLAIMED | 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) { - uart_close (sp); - return INVALID_SERIAL_PORT; - } - - tcflush (sp->fd, TCIFLUSH); - return sp; -} - -// TODO Remove PN53x related timeout -#define UART_TIMEOUT(X) ((X * 7) + 15000) // where X is 1-byte duration (µs): X * 6+1 bytes (PN53x's ACK + 1 other chance) + 15 ms (PN532 Tmax to reply ACK) -// UART_SPEED_T0_TIME(X) convert baud rate to interval between 2 bytes (in us) -#define UART_SPEED_T0_TIME(X) ((1000000 * 9)/ X) // 8,n,1 => 9 bits => data rate ~= bauds/9 (bytes/s); ex: 8N1@9600 ~= 1066 bytes/s -void -uart_set_speed (serial_port sp, const uint32_t uiPortSpeed) -{ - long int iTimeout = UART_TIMEOUT(UART_SPEED_T0_TIME(uiPortSpeed)); - DBG ("Serial port speed requested to be set to %d bauds (%ld µs).", uiPortSpeed, iTimeout); - const serial_port_unix *spu = (serial_port_unix *) sp; - - // Portability note: on some systems, B9600 != 9600 so we have to do - // uint32_t <=> speed_t associations by hand. - speed_t stPortSpeed = B9600; - switch (uiPortSpeed) { - 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 - default: - ERR ("Unable to set serial port speed to %d bauds. Speed value must be one of those defined in termios(3).", - uiPortSpeed); - return; - }; - // Set default timeout - default_timeout.tv_usec = iTimeout; - - // Set port speed (Input and Output) - cfsetispeed ((struct termios *) &(spu->tiNew), stPortSpeed); - cfsetospeed ((struct termios *) &(spu->tiNew), stPortSpeed); - if (tcsetattr (spu->fd, TCSADRAIN, &(spu->tiNew)) == -1) { - ERR ("%s", "Unable to apply new speed settings."); - } -} - -uint32_t -uart_get_speed (serial_port sp) -{ - uint32_t uiPortSpeed = 0; - 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; -# 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 - } - - return uiPortSpeed; -} - -void -uart_close (const serial_port sp) -{ - if (((serial_port_unix *) sp)->fd >= 0) { - tcsetattr (((serial_port_unix *) sp)->fd, TCSANOW, &((serial_port_unix *) sp)->tiOld); - close (((serial_port_unix *) sp)->fd); - } - free (sp); -} - -/** - * @brief Receive data from UART and copy data to \a pbtRx - * - * @return 0 on success, otherwise driver error code - */ -int -uart_receive (serial_port sp, byte_t * pbtRx, size_t * pszRx) -{ - int res; - int byteCount; - fd_set rfds; - struct timeval tv; - - // Reset the output count - *pszRx = 0; - - do { - // Reset file descriptor - FD_ZERO (&rfds); - FD_SET (((serial_port_unix *) sp)->fd, &rfds); - tv = default_timeout; - res = select (((serial_port_unix *) sp)->fd + 1, &rfds, NULL, NULL, &tv); - - // Read error - if (res < 0) { - DBG ("%s", "RX error."); - return DEIO; - } - // Read time-out - if (res == 0) { - if (*pszRx == 0) { - // Error, we received no data - DBG ("RX time-out (%ld µs), buffer empty.", default_timeout.tv_usec); - return DETIMEOUT; - } else { - // We received some data, but nothing more is available - return 0; - } - } - // Retrieve the count of the incoming bytes - res = ioctl (((serial_port_unix *) sp)->fd, FIONREAD, &byteCount); - if (res < 0) { - return DEIO; - } - // There is something available, read the data - res = read (((serial_port_unix *) sp)->fd, pbtRx + (*pszRx), byteCount); - - // Stop if the OS has some troubles reading the data - if (res <= 0) { - return DEIO; - } - - *pszRx += res; - - } while (byteCount); - - return 0; -} - -/** - * @brief Send \a pbtTx content to UART - * - * @return 0 on success, otherwise a driver error is returned - */ -int -uart_send (serial_port sp, const byte_t * pbtTx, const size_t szTx) -{ - int32_t res; - size_t szPos = 0; - fd_set rfds; - struct timeval tv; - - while (szPos < szTx) { - // Reset file descriptor - FD_ZERO (&rfds); - FD_SET (((serial_port_unix *) sp)->fd, &rfds); - tv = default_timeout; - res = select (((serial_port_unix *) sp)->fd + 1, NULL, &rfds, NULL, &tv); - - // Write error - if (res < 0) { - DBG ("%s", "TX error."); - return DEIO; - } - // Write time-out - if (res == 0) { - DBG ("%s", "TX time-out."); - return DETIMEOUT; - } - // Send away the bytes - res = write (((serial_port_unix *) sp)->fd, pbtTx + szPos, szTx - szPos); - - // Stop if the OS has some troubles sending the data - if (res <= 0) { - return DEIO; - } - - szPos += res; - } - return 0; -} - +// The POSIX serial port implementation +# include "uart_posix.c" #else // The windows serial port implementation - -typedef struct { - HANDLE hPort; // Serial port handle - DCB dcb; // Device control settings - COMMTIMEOUTS ct; // Serial port time-out configuration -} serial_port_windows; - -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); - _strupr (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) { - 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)) { - uart_close (sp); - return INVALID_SERIAL_PORT; - } - // Update the active serial port - if (!SetCommState (sp->hPort, &sp->dcb)) { - uart_close (sp); - return INVALID_SERIAL_PORT; - } - - sp->ct.ReadIntervalTimeout = 30; - sp->ct.ReadTotalTimeoutMultiplier = 0; - sp->ct.ReadTotalTimeoutConstant = 30; - sp->ct.WriteTotalTimeoutMultiplier = 30; - sp->ct.WriteTotalTimeoutConstant = 0; - - 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) -{ - if (((serial_port_windows *) sp)->hPort != INVALID_HANDLE_VALUE) { - CloseHandle (((serial_port_windows *) sp)->hPort); - } - free (sp); -} - -// TODO Remove PN53x related timeout -void -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); - return; - }; - spw = (serial_port_windows *) sp; - - // Set timeouts - //printf ("UART_SPEED_T0_TIME (%d) = %d\n", uiPortSpeed, UART_SPEED_T0_TIME(uiPortSpeed)); - int iTimeout = 200; - spw->ct.ReadIntervalTimeout = 2; - spw->ct.ReadTotalTimeoutMultiplier = 0; - spw->ct.ReadTotalTimeoutConstant = iTimeout; - spw->ct.WriteTotalTimeoutMultiplier = iTimeout; - spw->ct.WriteTotalTimeoutConstant = 0; - - if (!SetCommTimeouts (spw->hPort, &spw->ct)) { - ERR ("Unable to apply new timeout settings."); - return; - } - - // Set baud rate - spw->dcb.BaudRate = uiPortSpeed; - if (!SetCommState (spw->hPort, &spw->dcb)) { - ERR ("Unable to apply new speed settings."); - return; - } - PurgeComm (spw->hPort, PURGE_RXABORT | PURGE_RXCLEAR); -} - -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)) - return spw->dcb.BaudRate; - - return 0; -} - -int -uart_receive (serial_port sp, byte_t * pbtRx, size_t * pszRx) -{ - if (!ReadFile (((serial_port_windows *) sp)->hPort, pbtRx, (DWORD)(*pszRx), (LPDWORD) pszRx, NULL)) { - return DEIO; - } - if (!*pszRx) - return DEIO; - return 0; -} - -int -uart_send (serial_port sp, const byte_t * pbtTx, const size_t szTx) -{ - DWORD dwTxLen = 0; - if (!WriteFile (((serial_port_windows *) sp)->hPort, pbtTx, szTx, &dwTxLen, NULL)) { - return DEIO; - } - if (!dwTxLen) - return DEIO; - return 0; -} - +# include "uart_win32.c" #endif /* _WIN32 */ diff --git a/libnfc/buses/uart.h b/libnfc/buses/uart.h index c2c8f94..15bb3f0 100644 --- a/libnfc/buses/uart.h +++ b/libnfc/buses/uart.h @@ -43,22 +43,15 @@ # include # include # include - - // unistd.h is needed for usleep() fct. # include # define delay_ms( X ) usleep( X * 1000 ) # else -# include - -# define snprintf _snprintf -# define strdup _strdup +# include "contrib/windows.h" # define delay_ms( X ) Sleep( X ) # endif // Path to the serial port is OS-dependant. // Try to guess what we should use. -// -// XXX: Some review from users cross-compiling is welcome! # if defined (_WIN32) # define DEFAULT_SERIAL_PORTS { "COM1", "COM2", "COM3", "COM4", NULL } # elif defined(__APPLE__) diff --git a/libnfc/buses/uart_posix.c b/libnfc/buses/uart_posix.c new file mode 100644 index 0000000..536bbe8 --- /dev/null +++ b/libnfc/buses/uart_posix.c @@ -0,0 +1,298 @@ +/*- + * Public platform independent Near Field Communication (NFC) library + * + * Copyright (C) 2009, 2010, Roel Verdult, Romuald Conty + * + * This program is free software: you can redistribute it and/or modify it + * under the terms of the GNU Lesser General Public License as published by the + * Free Software Foundation, either version 3 of the License, or (at your + * option) any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with this program. If not, see + * + */ + +/** + * @file uart_posix.c + * @brief POSIX UART driver + */ + +# include +# include +typedef struct termios term_info; +typedef struct { + int fd; // Serial port file descriptor + term_info tiOld; // Terminal info before using the port + term_info tiNew; // Terminal info during the transaction +} serial_port_unix; + +// timeval struct that define timeout delay for serial port +static struct timeval default_timeout = { + .tv_sec = 0, // 0 second + .tv_usec = 60000 // 60 ms +}; + +// 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_NONBLOCK); + 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; + } + // Make sure the port is not claimed already + if (sp->tiOld.c_iflag & CCLAIMED) { + uart_close (sp); + return CLAIMED_SERIAL_PORT; + } + // Copy the old terminal info struct + sp->tiNew = sp->tiOld; + + sp->tiNew.c_cflag = CS8 | CLOCAL | CREAD; + sp->tiNew.c_iflag = CCLAIMED | 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) { + uart_close (sp); + return INVALID_SERIAL_PORT; + } + + tcflush (sp->fd, TCIFLUSH); + return sp; +} + +// TODO Remove PN53x related timeout +#define UART_TIMEOUT(X) ((X * 7) + 15000) // where X is 1-byte duration (µs): X * 6+1 bytes (PN53x's ACK + 1 other chance) + 15 ms (PN532 Tmax to reply ACK) +// UART_SPEED_T0_TIME(X) convert baud rate to interval between 2 bytes (in us) +#define UART_SPEED_T0_TIME(X) ((1000000 * 9)/ X) // 8,n,1 => 9 bits => data rate ~= bauds/9 (bytes/s); ex: 8N1@9600 ~= 1066 bytes/s +void +uart_set_speed (serial_port sp, const uint32_t uiPortSpeed) +{ + long int iTimeout = UART_TIMEOUT(UART_SPEED_T0_TIME(uiPortSpeed)); + DBG ("Serial port speed requested to be set to %d bauds (%ld µs).", uiPortSpeed, iTimeout); + const serial_port_unix *spu = (serial_port_unix *) sp; + + // Portability note: on some systems, B9600 != 9600 so we have to do + // uint32_t <=> speed_t associations by hand. + speed_t stPortSpeed = B9600; + switch (uiPortSpeed) { + 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 + default: + ERR ("Unable to set serial port speed to %d bauds. Speed value must be one of those defined in termios(3).", + uiPortSpeed); + return; + }; + // Set default timeout + default_timeout.tv_usec = iTimeout; + + // Set port speed (Input and Output) + cfsetispeed ((struct termios *) &(spu->tiNew), stPortSpeed); + cfsetospeed ((struct termios *) &(spu->tiNew), stPortSpeed); + if (tcsetattr (spu->fd, TCSADRAIN, &(spu->tiNew)) == -1) { + ERR ("%s", "Unable to apply new speed settings."); + } +} + +uint32_t +uart_get_speed (serial_port sp) +{ + uint32_t uiPortSpeed = 0; + 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; +# 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 + } + + return uiPortSpeed; +} + +void +uart_close (const serial_port sp) +{ + if (((serial_port_unix *) sp)->fd >= 0) { + tcsetattr (((serial_port_unix *) sp)->fd, TCSANOW, &((serial_port_unix *) sp)->tiOld); + close (((serial_port_unix *) sp)->fd); + } + free (sp); +} + +/** + * @brief Receive data from UART and copy data to \a pbtRx + * + * @return 0 on success, otherwise driver error code + */ +int +uart_receive (serial_port sp, byte_t * pbtRx, size_t * pszRx) +{ + int res; + int byteCount; + fd_set rfds; + struct timeval tv; + + // Reset the output count + *pszRx = 0; + + do { + // Reset file descriptor + FD_ZERO (&rfds); + FD_SET (((serial_port_unix *) sp)->fd, &rfds); + tv = default_timeout; + res = select (((serial_port_unix *) sp)->fd + 1, &rfds, NULL, NULL, &tv); + + // Read error + if (res < 0) { + DBG ("%s", "RX error."); + return DEIO; + } + // Read time-out + if (res == 0) { + if (*pszRx == 0) { + // Error, we received no data + DBG ("RX time-out (%ld µs), buffer empty.", default_timeout.tv_usec); + return DETIMEOUT; + } else { + // We received some data, but nothing more is available + return 0; + } + } + // Retrieve the count of the incoming bytes + res = ioctl (((serial_port_unix *) sp)->fd, FIONREAD, &byteCount); + if (res < 0) { + return DEIO; + } + // There is something available, read the data + res = read (((serial_port_unix *) sp)->fd, pbtRx + (*pszRx), byteCount); + + // Stop if the OS has some troubles reading the data + if (res <= 0) { + return DEIO; + } + + *pszRx += res; + + } while (byteCount); + + return 0; +} + +/** + * @brief Send \a pbtTx content to UART + * + * @return 0 on success, otherwise a driver error is returned + */ +int +uart_send (serial_port sp, const byte_t * pbtTx, const size_t szTx) +{ + int32_t res; + size_t szPos = 0; + fd_set rfds; + struct timeval tv; + + while (szPos < szTx) { + // Reset file descriptor + FD_ZERO (&rfds); + FD_SET (((serial_port_unix *) sp)->fd, &rfds); + tv = default_timeout; + res = select (((serial_port_unix *) sp)->fd + 1, NULL, &rfds, NULL, &tv); + + // Write error + if (res < 0) { + DBG ("%s", "TX error."); + return DEIO; + } + // Write time-out + if (res == 0) { + DBG ("%s", "TX time-out."); + return DETIMEOUT; + } + // Send away the bytes + res = write (((serial_port_unix *) sp)->fd, pbtTx + szPos, szTx - szPos); + + // Stop if the OS has some troubles sending the data + if (res <= 0) { + return DEIO; + } + + szPos += res; + } + return 0; +} + diff --git a/libnfc/buses/uart_win32.c b/libnfc/buses/uart_win32.c new file mode 100644 index 0000000..89f30b9 --- /dev/null +++ b/libnfc/buses/uart_win32.c @@ -0,0 +1,164 @@ +/*- + * Public platform independent Near Field Communication (NFC) library + * + * Copyright (C) 2009, 2010, Roel Verdult, Romuald Conty + * + * This program is free software: you can redistribute it and/or modify it + * under the terms of the GNU Lesser General Public License as published by the + * Free Software Foundation, either version 3 of the License, or (at your + * option) any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with this program. If not, see + * + */ + +/** + * @file uart.c + * @brief Windows UART driver + */ + +typedef struct { + HANDLE hPort; // Serial port handle + DCB dcb; // Device control settings + COMMTIMEOUTS ct; // Serial port time-out configuration +} serial_port_windows; + +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); + _strupr (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) { + 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)) { + uart_close (sp); + return INVALID_SERIAL_PORT; + } + // Update the active serial port + if (!SetCommState (sp->hPort, &sp->dcb)) { + uart_close (sp); + return INVALID_SERIAL_PORT; + } + + sp->ct.ReadIntervalTimeout = 30; + sp->ct.ReadTotalTimeoutMultiplier = 0; + sp->ct.ReadTotalTimeoutConstant = 30; + sp->ct.WriteTotalTimeoutMultiplier = 30; + sp->ct.WriteTotalTimeoutConstant = 0; + + 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) +{ + if (((serial_port_windows *) sp)->hPort != INVALID_HANDLE_VALUE) { + CloseHandle (((serial_port_windows *) sp)->hPort); + } + free (sp); +} + +// TODO Remove PN53x related timeout +void +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); + return; + }; + spw = (serial_port_windows *) sp; + + // Set timeouts + //printf ("UART_SPEED_T0_TIME (%d) = %d\n", uiPortSpeed, UART_SPEED_T0_TIME(uiPortSpeed)); + int iTimeout = 200; + spw->ct.ReadIntervalTimeout = 2; + spw->ct.ReadTotalTimeoutMultiplier = 0; + spw->ct.ReadTotalTimeoutConstant = iTimeout; + spw->ct.WriteTotalTimeoutMultiplier = iTimeout; + spw->ct.WriteTotalTimeoutConstant = 0; + + if (!SetCommTimeouts (spw->hPort, &spw->ct)) { + ERR ("Unable to apply new timeout settings."); + return; + } + + // Set baud rate + spw->dcb.BaudRate = uiPortSpeed; + if (!SetCommState (spw->hPort, &spw->dcb)) { + ERR ("Unable to apply new speed settings."); + return; + } + PurgeComm (spw->hPort, PURGE_RXABORT | PURGE_RXCLEAR); +} + +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)) + return spw->dcb.BaudRate; + + return 0; +} + +int +uart_receive (serial_port sp, byte_t * pbtRx, size_t * pszRx) +{ + if (!ReadFile (((serial_port_windows *) sp)->hPort, pbtRx, (DWORD)(*pszRx), (LPDWORD) pszRx, NULL)) { + return DEIO; + } + if (!*pszRx) + return DEIO; + return 0; +} + +int +uart_send (serial_port sp, const byte_t * pbtTx, const size_t szTx) +{ + DWORD dwTxLen = 0; + if (!WriteFile (((serial_port_windows *) sp)->hPort, pbtTx, szTx, &dwTxLen, NULL)) { + return DEIO; + } + if (!dwTxLen) + return DEIO; + return 0; +} +