/**************************************************************************** * examples/chrono/chrono_main.c * * Copyright (C) 2008, 2011-2012 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 #include #include #include /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ #define BUTTON_SIGNO 13 #define BUTTON_STACKSIZE 2048 #define BUTTON_PRIORITY 100 #define BUTTON_DEVPATH "/dev/buttons" #define SLCD_DEVNAME "/dev/slcd0" #define SLCD_BUFSIZE 8 /**************************************************************************** * Private Types ****************************************************************************/ /* What is the current chronometer status? */ enum chronostate_e { CHRONO_RESETED = 0, CHRONO_RUNNING, CHRONO_STOPPED, }; /* All state information for this test is kept within the following structure * in order create a namespace and to minimize the possibility of name * collisions. * * NOTE: stream must be the first element of struct slcd_chrono_s to support * casting between these two types. */ struct slcd_chrono_s { struct lib_outstream_s stream; /* Stream to use for all output */ struct slcd_attributes_s attr; /* Size of the SLCD (rows x columns) */ int fd; /* File descriptor or the open SLCD device */ bool initialized; /* TRUE: Initialized */ struct timespec ts_start; /* Store the initial time */ struct timespec ts_end; /* Store the final time */ int state; /* The I/O buffer */ uint8_t buffer[SLCD_BUFSIZE]; }; /**************************************************************************** * Private Data ****************************************************************************/ static struct slcd_chrono_s g_slcd; /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: button_daemon ****************************************************************************/ static int button_daemon(int argc, char *argv[]) { FAR struct slcd_chrono_s *priv = &g_slcd; struct btn_notify_s btnevents; btn_buttonset_t supported; int ret; int fd; int i; UNUSED(i); printf("button_daemon: Running\n"); /* Open the BUTTON driver */ printf("button_daemon: Opening %s\n", BUTTON_DEVPATH); fd = open(BUTTON_DEVPATH, O_RDONLY | O_NONBLOCK); if (fd < 0) { int errcode = errno; printf("button_daemon: ERROR: Failed to open %s: %d\n", BUTTON_DEVPATH, errcode); goto errout; } /* Get the set of BUTTONs supported */ ret = ioctl(fd, BTNIOC_SUPPORTED, (unsigned long)((uintptr_t)&supported)); if (ret < 0) { int errcode = errno; printf("button_daemon: ERROR: ioctl(BTNIOC_SUPPORTED) failed: %d\n", errcode); goto errout_with_fd; } printf("button_daemon: Supported BUTTONs 0x%02x\n", (unsigned int)supported); /* Define the notifications events */ btnevents.bn_press = supported; btnevents.bn_release = supported; btnevents.bn_event.sigev_notify = SIGEV_SIGNAL; btnevents.bn_event.sigev_signo = BUTTON_SIGNO; /* Register to receive a signal when buttons are pressed/released */ ret = ioctl(fd, BTNIOC_REGISTER, (unsigned long)((uintptr_t)&btnevents)); if (ret < 0) { int errcode = errno; printf("button_daemon: ERROR: ioctl(BTNIOC_SUPPORTED) failed: %d\n", errcode); goto errout_with_fd; } /* Now loop forever, waiting BUTTONs events */ for (; ; ) { struct siginfo value; sigset_t set; /* Wait for a signal */ sigemptyset(&set); sigaddset(&set, BUTTON_SIGNO); ret = sigwaitinfo(&set, &value); if (ret < 0) { int errcode = errno; printf("button_daemon: ERROR: sigwaitinfo() failed: %d\n", errcode); goto errout_with_fd; } if (priv->state == CHRONO_STOPPED) { clock_gettime(CLOCK_MONOTONIC, &priv->ts_start); priv->state = CHRONO_RUNNING; } else { priv->state = CHRONO_STOPPED; } /* Make sure that everything is displayed */ fflush(stdout); usleep(1000); } errout_with_fd: close(fd); errout: printf("button_daemon: Terminating\n"); return EXIT_FAILURE; } /**************************************************************************** * Name: slcd_flush ****************************************************************************/ static int slcd_flush(FAR struct lib_outstream_s *stream) { FAR struct slcd_chrono_s *priv = (FAR struct slcd_chrono_s *)stream; FAR const uint8_t *buffer; ssize_t nwritten; ssize_t remaining; /* Loop until all bytes were written (handling both partial and interrupted * writes). */ remaining = stream->nput; buffer = priv->buffer; while (remaining > 0) { nwritten = write(priv->fd, buffer, remaining); if (nwritten < 0) { int errcode = errno; printf("write failed: %d\n", errcode); if (errcode != EINTR) { exit(EXIT_FAILURE); } } else { remaining -= nwritten; buffer += nwritten; } } /* Reset the stream */ stream->nput = 0; return OK; } /**************************************************************************** * Name: slcd_putc ****************************************************************************/ static void slcd_putc(FAR struct lib_outstream_s *stream, int ch) { FAR struct slcd_chrono_s *priv = (FAR struct slcd_chrono_s *)stream; /* Write the character to the buffer */ priv->buffer[stream->nput] = ch; stream->nput++; priv->buffer[stream->nput] = '\0'; /* If the buffer is full, flush it */ if (stream->nput >= CONFIG_EXAMPLES_SLCD_BUFSIZE) { slcd_flush(stream); } } /**************************************************************************** * Name: slcd_puts ****************************************************************************/ static void slcd_puts(FAR struct lib_outstream_s *outstream, FAR const char *str) { for (; *str; str++) { slcd_put((int)*str, outstream); } } /**************************************************************************** * chrono_main ****************************************************************************/ int main(int argc, FAR char *argv[]) { FAR struct slcd_chrono_s *priv = &g_slcd; FAR char str[8] = "00:00.0"; int fd; int ret; long sec; long min; /* Create a thread to wait for the button events */ ret = task_create("button_daemon", BUTTON_PRIORITY, BUTTON_STACKSIZE, button_daemon, NULL); if (ret < 0) { int errcode = errno; printf("buttons_main: ERROR: Failed to start button_daemon: %d\n", errcode); return EXIT_FAILURE; } /* Open the SLCD device */ printf("Opening %s for read/write access\n", SLCD_DEVNAME); fd = open(SLCD_DEVNAME, O_RDWR); if (fd < 0) { printf("Failed to open %s: %d\n", CONFIG_EXAMPLES_SLCD_DEVNAME, errno); goto errout; } /* Get the attributes of the SCLD device */ ret = ioctl(fd, SLCDIOC_GETATTRIBUTES, (unsigned long)&priv->attr); if (ret < 0) { printf("ioctl(SLCDIOC_GETATTRIBUTES) failed: %d\n", errno); goto errout_with_fd; } /* Are we already initialized? */ if (!priv->initialized) { /* Initialize the output stream */ memset(priv, 0, sizeof(struct slcd_chrono_s)); priv->stream.put = slcd_putc; #ifdef CONFIG_STDIO_LINEBUFFER priv->stream.flush = slcd_flush; #endif /* Get the attributes of the SCLD device */ ret = ioctl(fd, SLCDIOC_GETATTRIBUTES, (unsigned long)&priv->attr); if (ret < 0) { printf("ioctl(SLCDIOC_GETATTRIBUTES) failed: %d\n", errno); goto errout_with_fd; } printf("Attributes:\n"); printf(" rows: %d columns: %d nbars: %d\n", priv->attr.nrows, priv->attr.ncolumns, priv->attr.nbars); printf(" max contrast: %d max brightness: %d\n", priv->attr.maxcontrast, priv->attr.maxbrightness); /* Home the cursor and clear the display */ printf("Clear screen\n"); slcd_encode(SLCDCODE_CLEAR, 0, &priv->stream); slcd_flush(&priv->stream); priv->initialized = true; } /* Save the file descriptor in a place where slcd_flush can find it */ priv->fd = fd; /* Set the cursor to the beginning of the current row by homing the cursor * then going down as necessary, and erase to the end of the line. */ slcd_encode(SLCDCODE_HOME, 0, &priv->stream); slcd_encode(SLCDCODE_ERASEEOL, 0, &priv->stream); priv->state = CHRONO_RESETED; for (; ; ) { /* If the device is reseted, show 00.. and assume it is initial time */ if (priv->state == CHRONO_RESETED) { /* Copy the initial value */ strncpy(str, "00:00.0", 7); /* Print the initial reset value */ slcd_puts(&priv->stream, str); slcd_flush(&priv->stream); /* Move to stopped state to avoid wasting time here */ priv->state = CHRONO_STOPPED; } /* If the device is stopped nothing to do here */ if (priv->state == CHRONO_STOPPED) { } /* If the chronometer is running, get the elapsed time and how it */ if (priv->state == CHRONO_RUNNING) { /* Get the current time */ clock_gettime(CLOCK_MONOTONIC, &priv->ts_end); /* How many seconds passed from initial time? */ sec = priv->ts_end.tv_sec - priv->ts_start.tv_sec; /* Get the amount of minutes */ min = sec / 60; /* Get the remaining seconds */ sec = sec % 60; sprintf(str, "%02d:%02d:%01d", min, sec, (priv->ts_end.tv_nsec / 100000000)); /* Print it into LCD */ slcd_encode(SLCDCODE_HOME, 0, &priv->stream); slcd_puts(&priv->stream, str); slcd_flush(&priv->stream); } /* usleep(1000); */ } /* Normal exit */ close(fd); return 0; errout_with_fd: close(priv->fd); errout: priv->initialized = false; exit(EXIT_FAILURE); }