/**************************************************************************** * examples/usbserial/main.c * * Copyright (C) 2008 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include /**************************************************************************** * Definitions ****************************************************************************/ #ifdef CONFIG_CPP_HAVE_VARARGS # ifdef CONFIG_DEBUG # define message(...) lib_lowprintf(__VA_ARGS__) # else # define message(...) printf(__VA_ARGS__) # endif #else # ifdef CONFIG_DEBUG # define message lib_lowprintf # else # define message printf # endif #endif #define IOBUFFER_SIZE 256 /**************************************************************************** * Private Data ****************************************************************************/ static const char g_shortmsg[] = "Hello, World!!\n"; static const char g_longmsg[] = "The Spanish Armada a Speech by Queen Elizabeth I of England\n" "Addressed to the English army at Tilbury Fort - 1588\n" "My loving people, we have been persuaded by some, that are careful of our " "safety, to take heed how we commit ourselves to armed multitudes, for fear " "of treachery; but I assure you, I do not desire to live to distrust my " "faithful and loving people.\n" "Let tyrants fear; I have always so behaved myself that, under God, I have " "placed my chiefest strength and safeguard in the loyal hearts and good will " "of my subjects. And therefore I am come amongst you at this time, not as for " "my recreation or sport, but being resolved, in the midst and heat of the " "battle, to live or die amongst you all; to lay down, for my God, and for " "my kingdom, and for my people, my honour and my blood, even the dust.\n" "I know I have but the body of a weak and feeble woman; but I have the heart " "of a king, and of a king of England, too; and think foul scorn that Parma " "or Spain, or any prince of Europe, should dare to invade the borders of my " "realms: to which, rather than any dishonour should grow by me, I myself will " "take up arms; I myself will be your general, judge, and rewarder of every " "one of your virtues in the field.\n" "I know already, by your forwardness, that you have deserved rewards and " "crowns; and we do assure you, on the word of a prince, they shall be duly " "paid you. In the mean my lieutenant general shall be in my stead, than whom " "never prince commanded a more noble and worthy subject; not doubting by " "your obedience to my general, by your concord in the camp, and by your " "valour in the field, we shall shortly have a famous victory over the enemies " "of my God, of my kingdom, and of my people.\n"; static char g_iobuffer[IOBUFFER_SIZE]; /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * user_initialize ****************************************************************************/ #ifndef CONFIG_HAVE_WEAKFUNCTIONS void user_initialize(void) { /* Stub that must be provided only if the toolchain does not support weak * functions. */ } #endif /**************************************************************************** * user_start ****************************************************************************/ int user_start(int argc, char *argv[]) { int infd; int outfd; int count; ssize_t nbytes; int ret; int i; /* Initialize the USB serial driver */ message("user_start: Registering USB serial driver\n"); ret = usbdev_serialinitialize(0); if (ret < 0) { message("user_start: ERROR: Failed to create the USB serial device: %d\n", -ret); return 1; } message("user_start: Successfully registered the serial driver\n"); /* Open the USB serial device for writing (blocking) */ do { message("user_start: Opening USB serial driver\n"); outfd = open("/dev/ttyUSB0", O_WRONLY); if (outfd < 0) { int errcode = errno; message("user_start: ERROR: Failed to open /dev/ttyUSB0 for writing: %d\n", errcode); /* ENOTCONN means that the USB device is not yet connected */ if (errcode == ENOTCONN) { message("user_start: Not connected. Wait and try again.\n"); sleep(5); } else { /* Give up on other errors */ message("user_start: Aborting\n"); return 2; } } } while (outfd < 0); /* Open the USB serial device for reading (non-blocking) */ infd = open("/dev/ttyUSB0", O_RDONLY|O_NONBLOCK); if (infd < 0) { message("user_start: ERROR: Failed to open /dev/ttyUSB0 for reading: %d\n", errno); close(outfd); return 3; } message("user_start: Successfully opened the serial driver\n"); /* Then say hello -- forever */ count = 0; for (;;) { if (count < 8) { message("user_start: Saying hello\n"); nbytes = write(outfd, g_shortmsg, sizeof(g_shortmsg)); count++; } else { message("user_start: Reciting QEI's speech of 1588\n"); nbytes = write(outfd, g_longmsg, sizeof(g_longmsg)); count = 0; } if (nbytes < 0) { message("user_start: ERROR: write failed: %d\n", errno); close(infd); close(outfd); return 4; } /* Poll for incoming messages */ message("user_start: Waiting\n"); for (i = 0; i < 5; i++) { nbytes = read(infd, g_iobuffer, IOBUFFER_SIZE); if (nbytes < 0) { int errorcode = errno; if (errorcode != EAGAIN) { message("user_start: ERROR: read failed: %d\n", errno); close(infd); close(outfd); return 6; } } else { message("user_start: Received %d bytes:\n", nbytes); if (nbytes > 0) { message("user_start: "); (void)fwrite(g_iobuffer, 1, nbytes, stdout); } } sleep(1); } } /* Won't get here, but if we did this what we would have to do */ close(infd); close(outfd); return 0; }