/* * Copyright (C) 2010 NXP Semiconductors * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /** * \file phDalNfc_uart.c * \brief DAL com port implementation for linux * * Project: Trusted NFC Linux Lignt * * $Date: 07 aug 2009 * $Author: Jonathan roux * $Revision: 1.0 $ * */ #include #include #include #include #include #include #include #include #include #if defined(ANDROID) #include #endif typedef struct { int nHandle; char nOpened; struct termios nIoConfigBackup; struct termios nIoConfig; } phDal4Nfc_ComPortContext_t; /*----------------------------------------------------------------------------------- COM PORT CONFIGURATION ------------------------------------------------------------------------------------*/ #define DAL_BAUD_RATE B115200 /*----------------------------------------------------------------------------------- VARIABLES ------------------------------------------------------------------------------------*/ static phDal4Nfc_ComPortContext_t gComPortContext; /*----------------------------------------------------------------------------- FUNCTION: phDal4Nfc_uart_set_open_from_handle PURPOSE: Initialize internal variables -----------------------------------------------------------------------------*/ void phDal4Nfc_uart_initialize(void) { memset(&gComPortContext, 0, sizeof(phDal4Nfc_ComPortContext_t)); } /*----------------------------------------------------------------------------- FUNCTION: phDal4Nfc_uart_set_open_from_handle PURPOSE: The application could have opened the link itself. So we just need to get the handle and consider that the open operation has already been done. -----------------------------------------------------------------------------*/ void phDal4Nfc_uart_set_open_from_handle(phHal_sHwReference_t * pDalHwContext) { gComPortContext.nHandle = (int) pDalHwContext->p_board_driver; DAL_ASSERT_STR(gComPortContext.nHandle >= 0, "Bad passed com port handle"); gComPortContext.nOpened = 1; } /*----------------------------------------------------------------------------- FUNCTION: phDal4Nfc_uart_is_opened PURPOSE: Returns if the link is opened or not. (0 = not opened; 1 = opened) -----------------------------------------------------------------------------*/ int phDal4Nfc_uart_is_opened(void) { return gComPortContext.nOpened; } /*----------------------------------------------------------------------------- FUNCTION: phDal4Nfc_uart_flush PURPOSE: Flushes the link ; clears the link buffers -----------------------------------------------------------------------------*/ void phDal4Nfc_uart_flush(void) { int ret; /* flushes the com port */ ret = tcflush(gComPortContext.nHandle, TCIFLUSH); DAL_ASSERT_STR(ret!=-1, "tcflush failed"); } /*----------------------------------------------------------------------------- FUNCTION: phDal4Nfc_uart_close PURPOSE: Closes the link -----------------------------------------------------------------------------*/ void phDal4Nfc_uart_close(void) { if (gComPortContext.nOpened == 1) { close(gComPortContext.nHandle); gComPortContext.nHandle = 0; gComPortContext.nOpened = 0; } } /*----------------------------------------------------------------------------- FUNCTION: phDal4Nfc_uart_close PURPOSE: Closes the link -----------------------------------------------------------------------------*/ NFCSTATUS phDal4Nfc_uart_open_and_configure(pphDal4Nfc_sConfig_t pConfig, void ** pLinkHandle) { char * pComPort; int nComStatus; NFCSTATUS nfcret = NFCSTATUS_SUCCESS; int ret; DAL_ASSERT_STR(gComPortContext.nOpened==0, "Trying to open but already done!"); switch(pConfig->nLinkType) { case ENUM_DAL_LINK_TYPE_COM1: pComPort = "/dev/ttyS0"; break; case ENUM_DAL_LINK_TYPE_COM2: pComPort = "/dev/ttyS1"; break; case ENUM_DAL_LINK_TYPE_COM3: pComPort = "/dev/ttyS2"; break; case ENUM_DAL_LINK_TYPE_COM4: pComPort = "/dev/ttyS3"; break; case ENUM_DAL_LINK_TYPE_COM5: pComPort = "/dev/ttyS4"; break; case ENUM_DAL_LINK_TYPE_COM6: pComPort = "/dev/ttyS5"; break; case ENUM_DAL_LINK_TYPE_COM7: pComPort = "/dev/ttyS6"; break; case ENUM_DAL_LINK_TYPE_COM8: pComPort = "/dev/ttyS7"; break; case ENUM_DAL_LINK_TYPE_USB: pComPort = "/dev/ttyUSB0"; break; default: return NFCSTATUS_INVALID_PARAMETER; } /* open communication port handle */ gComPortContext.nHandle = open(pComPort, O_RDWR | O_NOCTTY); if (gComPortContext.nHandle < 0) { *pLinkHandle = NULL; return PHNFCSTVAL(CID_NFC_DAL, NFCSTATUS_INVALID_DEVICE); } gComPortContext.nOpened = 1; *pLinkHandle = (void*)gComPortContext.nHandle; /* * Now configure the com port */ ret = tcgetattr(gComPortContext.nHandle, &gComPortContext.nIoConfigBackup); /* save the old io config */ if (ret == -1) { /* tcgetattr failed -- it is likely that the provided port is invalid */ *pLinkHandle = NULL; return PHNFCSTVAL(CID_NFC_DAL, NFCSTATUS_INVALID_DEVICE); } ret = fcntl(gComPortContext.nHandle, F_SETFL, 0); /* Makes the read blocking (default). */ DAL_ASSERT_STR(ret != -1, "fcntl failed"); /* Configures the io */ memset((void *)&gComPortContext.nIoConfig, (int)0, (size_t)sizeof(struct termios)); /* BAUDRATE: Set bps rate. You could also use cfsetispeed and cfsetospeed. CRTSCTS : output hardware flow control (only used if the cable has all necessary lines. See sect. 7 of Serial-HOWTO) CS8 : 8n1 (8bit,no parity,1 stopbit) CLOCAL : local connection, no modem contol CREAD : enable receiving characters */ gComPortContext.nIoConfig.c_cflag = DAL_BAUD_RATE | CS8 | CLOCAL | CREAD; /* Control mode flags */ gComPortContext.nIoConfig.c_iflag = IGNPAR; /* Input mode flags : IGNPAR Ignore parity errors */ gComPortContext.nIoConfig.c_oflag = 0; /* Output mode flags */ gComPortContext.nIoConfig.c_lflag = 0; /* Local mode flags. Read mode : non canonical, no echo */ gComPortContext.nIoConfig.c_cc[VTIME] = 0; /* Control characters. No inter-character timer */ gComPortContext.nIoConfig.c_cc[VMIN] = 1; /* Control characters. Read is blocking until X characters are read */ /* TCSANOW Make changes now without waiting for data to complete TCSADRAIN Wait until everything has been transmitted TCSAFLUSH Flush input and output buffers and make the change */ ret = tcsetattr(gComPortContext.nHandle, TCSANOW, &gComPortContext.nIoConfig); DAL_ASSERT_STR(ret != -1, "tcsetattr failed"); /* On linux the DTR signal is set by default. That causes a problem for pn544 chip because this signal is connected to "reset". So we clear it. (on windows it is cleared by default). */ ret = ioctl(gComPortContext.nHandle, TIOCMGET, &nComStatus); DAL_ASSERT_STR(ret != -1, "ioctl TIOCMGET failed"); nComStatus &= ~TIOCM_DTR; ret = ioctl(gComPortContext.nHandle, TIOCMSET, &nComStatus); DAL_ASSERT_STR(ret != -1, "ioctl TIOCMSET failed"); DAL_DEBUG("Com port status=%d\n", nComStatus); usleep(10000); /* Mandatory sleep so that the DTR line is ready before continuing */ return nfcret; } /*----------------------------------------------------------------------------- FUNCTION: phDal4Nfc_uart_read PURPOSE: Reads nNbBytesToRead bytes and writes them in pBuffer. Returns the number of bytes really read or -1 in case of error. -----------------------------------------------------------------------------*/ int phDal4Nfc_uart_read(uint8_t * pBuffer, int nNbBytesToRead) { fd_set rfds; struct timeval tv; int ret; DAL_ASSERT_STR(gComPortContext.nOpened == 1, "read called but not opened!"); FD_ZERO(&rfds); FD_SET(gComPortContext.nHandle, &rfds); /* select will block for 10 sec */ tv.tv_sec = 2; tv.tv_usec = 0; ret = select(gComPortContext.nHandle + 1, &rfds, NULL, NULL, &tv); if (ret == -1) return -1; if (ret) return read(gComPortContext.nHandle, pBuffer, nNbBytesToRead); return 0; } /*----------------------------------------------------------------------------- FUNCTION: phDal4Nfc_link_write PURPOSE: Writes nNbBytesToWrite bytes from pBuffer to the link Returns the number of bytes that have been wrote to the interface or -1 in case of error. -----------------------------------------------------------------------------*/ int phDal4Nfc_uart_write(uint8_t * pBuffer, int nNbBytesToWrite) { fd_set wfds; struct timeval tv; int ret; DAL_ASSERT_STR(gComPortContext.nOpened == 1, "write called but not opened!"); FD_ZERO(&wfds); FD_SET(gComPortContext.nHandle, &wfds); /* select will block for 10 sec */ tv.tv_sec = 2; tv.tv_usec = 0; ret = select(gComPortContext.nHandle + 1, NULL, &wfds, NULL, &tv); if (ret == -1) return -1; if (ret) return write(gComPortContext.nHandle, pBuffer, nNbBytesToWrite); return 0; } /*----------------------------------------------------------------------------- FUNCTION: phDal4Nfc_uart_reset PURPOSE: Reset the PN544, using the VEN pin -----------------------------------------------------------------------------*/ int phDal4Nfc_uart_reset() { DAL_PRINT("phDal4Nfc_uart_reset"); return NFCSTATUS_FEATURE_NOT_SUPPORTED; } /*----------------------------------------------------------------------------- FUNCTION: phDal4Nfc_uart_write PURPOSE: Put the PN544 in download mode, using the GPIO4 pin -----------------------------------------------------------------------------*/ int phDal4Nfc_uart_download() { DAL_PRINT("phDal4Nfc_uart_download"); return NFCSTATUS_FEATURE_NOT_SUPPORTED; }