diff options
| -rw-r--r-- | apps/ChangeLog.txt | 3 | ||||
| -rw-r--r-- | apps/system/readline/readline.c | 53 | ||||
| -rw-r--r-- | nuttx/ChangeLog | 6 | ||||
| -rw-r--r-- | nuttx/configs/stm32f4discovery/usbnsh/defconfig | 12 | ||||
| -rw-r--r-- | nuttx/drivers/serial/Kconfig | 3 | ||||
| -rw-r--r-- | nuttx/drivers/serial/serial.c | 137 | ||||
| -rw-r--r-- | nuttx/drivers/usbdev/Kconfig | 2 | ||||
| -rw-r--r-- | nuttx/drivers/usbdev/cdcacm.c | 47 | ||||
| -rw-r--r-- | nuttx/drivers/usbdev/pl2303.c | 45 | ||||
| -rw-r--r-- | nuttx/include/nuttx/serial/serial.h | 77 |
10 files changed, 320 insertions, 65 deletions
diff --git a/apps/ChangeLog.txt b/apps/ChangeLog.txt index 6a2c1d4c9..e64509be9 100644 --- a/apps/ChangeLog.txt +++ b/apps/ChangeLog.txt @@ -502,3 +502,6 @@ once when NSH starts; the .nshrc script will be executed for each session: Once for serial, once for each USB connection, once for each Telnet session. + * apps/system/readline: Correct realine return value. Was not + any returning special values when end-of-file or read errors + occur (it would return an empty string which is not very useful). diff --git a/apps/system/readline/readline.c b/apps/system/readline/readline.c index f64049ed7..11c53cb50 100644 --- a/apps/system/readline/readline.c +++ b/apps/system/readline/readline.c @@ -132,23 +132,34 @@ static inline int readline_rawgetc(int infd) nread = read(infd, &buffer, 1); - /* Return EOF if the end of file (0) or error (-1) occurs. */ + /* Check for end-of-file. */ - if (nread < 1) + if (nread == 0) + { + /* Return zero on end-of-file */ + + return 0; + } + + /* Check if an error occurred */ + + else if (nread < 0) { /* EINTR is not really an error; it simply means that a signal we * received while watiing for intput. */ - if (nread == 0 || errno != EINTR) + int errcode = errno; + if (errcode != EINTR) + { - return EOF; + return -errcode; } } } while (nread < 1); - /* On success, returnt he character that was read */ + /* On success, return the character that was read */ return (int)buffer; } @@ -275,9 +286,29 @@ ssize_t readline(FAR char *buf, int buflen, FILE *instream, FILE *outstream) int ch = readline_rawgetc(infd); + /* Check for end-of-file or read error */ + + if (ch <= 0) + { + /* Did we already received some data? */ + + if (nch > 0) + { + /* Yes.. Terminate the line (which might be zero length) + * and return the data that was received. The end-of-file + * or error condition will be reported next time. + */ + + buf[nch] = '\0'; + return nch; + } + + return ch; + } + /* Are we processing a VT100 escape sequence */ - if (escape) + else if (escape) { /* Yes, is it an <esc>[, 3 byte sequence */ @@ -366,16 +397,6 @@ ssize_t readline(FAR char *buf, int buflen, FILE *instream, FILE *outstream) return nch; } - /* Check for end-of-file */ - - else if (ch == EOF) - { - /* Terminate the line (which might be zero length) */ - - buf[nch] = '\0'; - return nch; - } - /* Otherwise, check if the character is printable and, if so, put the * character in the line buffer */ diff --git a/nuttx/ChangeLog b/nuttx/ChangeLog index 759177fca..5c41a0e9c 100644 --- a/nuttx/ChangeLog +++ b/nuttx/ChangeLog @@ -4069,4 +4069,8 @@ this. * arch/arm/src/lm/chip/lm4f_memorymap.h: More LM4F changes from Jose Pablo Carballo. - + * drivers/serial/serial.c, include/nuttx/serial/serial.h, + drivers/usbdev/cdcacm.c, and drivers/pl2303.c: Add support for + removable serial devices (like USB serial). This support is enabled + by CONFIG_SERIAL_REMOVABLE and requires VBUS sensing support from + the board-specific logic. diff --git a/nuttx/configs/stm32f4discovery/usbnsh/defconfig b/nuttx/configs/stm32f4discovery/usbnsh/defconfig index ba704001a..f5e8e7d31 100644 --- a/nuttx/configs/stm32f4discovery/usbnsh/defconfig +++ b/nuttx/configs/stm32f4discovery/usbnsh/defconfig @@ -95,9 +95,7 @@ CONFIG_BOARD_LOOPSPERMSEC=16717 # # CONFIG_ARMV7M_TOOLCHAIN_ATOLLIC is not set # CONFIG_ARMV7M_TOOLCHAIN_BUILDROOT is not set -# CONFIG_ARMV7M_TOOLCHAIN_CODEREDL is not set # CONFIG_ARMV7M_TOOLCHAIN_CODEREDW is not set -# CONFIG_ARMV7M_TOOLCHAIN_CODESOURCERYL is not set CONFIG_ARMV7M_TOOLCHAIN_CODESOURCERYW=y # CONFIG_ARMV7M_TOOLCHAIN_DEVKITARM is not set # CONFIG_ARMV7M_TOOLCHAIN_GNU_EABI is not set @@ -374,6 +372,7 @@ CONFIG_SPI_EXCHANGE=y # CONFIG_SERCOMM_CONSOLE is not set CONFIG_SERIAL=y # CONFIG_DEV_LOWCONSOLE is not set +CONFIG_SERIAL_REMOVABLE=y # CONFIG_16550_UART is not set CONFIG_ARCH_HAVE_USART2=y CONFIG_MCU_SERIAL=y @@ -458,6 +457,7 @@ CONFIG_CDCACM_PRODUCTSTR="CDC/ACM Serial" # # System Logging # +# CONFIG_SYSLOG_ENABLE is not set CONFIG_SYSLOG=y CONFIG_SYSLOG_CHAR=y CONFIG_SYSLOG_DEVPATH="/dev/ttyS0" @@ -686,6 +686,10 @@ CONFIG_NSH_NESTDEPTH=3 # CONFIG_NSH_DISABLEBG is not set CONFIG_NSH_CONSOLE=y # CONFIG_NSH_USBCONSOLE is not set + +# +# USB Trace Support +# # CONFIG_NSH_CONDEV is not set CONFIG_NSH_ARCHINIT=y @@ -736,3 +740,7 @@ CONFIG_READLINE_ECHO=y # Sysinfo # # CONFIG_SYSTEM_SYSINFO is not set + +# +# USB Monitor +# diff --git a/nuttx/drivers/serial/Kconfig b/nuttx/drivers/serial/Kconfig index a1e0dff49..119923a69 100644 --- a/nuttx/drivers/serial/Kconfig +++ b/nuttx/drivers/serial/Kconfig @@ -10,6 +10,9 @@ config DEV_LOWCONSOLE ---help--- Use the simple, low-level, write-only serial console driver (minimal support) +config SERIAL_REMOVABLE + bool + config 16550_UART bool "16550 UART Chip support" default n diff --git a/nuttx/drivers/serial/serial.c b/nuttx/drivers/serial/serial.c index 9708eb5bc..0548d8c25 100644 --- a/nuttx/drivers/serial/serial.c +++ b/nuttx/drivers/serial/serial.c @@ -1,7 +1,7 @@ /************************************************************************************ * drivers/serial/serial.c * - * Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved. + * Copyright (C) 2007-2009, 2011-2013 Gregory Nutt. All rights reserved. * Author: Gregory Nutt <gnutt@nuttx.org> * * Redistribution and use in source and binary forms, with or without @@ -157,7 +157,11 @@ static void uart_pollnotify(FAR uart_dev_t *dev, pollevent_t eventset) struct pollfd *fds = dev->fds[i]; if (fds) { +#ifdef CONFIG_SERIAL_REMOVABLE + fds->revents |= ((fds->events | (POLLERR|POLLHUP)) & eventset); +#else fds->revents |= (fds->events & eventset); +#endif if (fds->revents != 0) { fvdbg("Report events: %02x\n", fds->revents); @@ -219,6 +223,15 @@ static int uart_putxmitchar(FAR uart_dev_t *dev, int ch) uart_disabletxint(dev); irqrestore(flags); +#ifdef CONFIG_SERIAL_REMOVABLE + /* Check if the removable device is no longer connected */ + + if (dev->disconnected) + { + return -ENOTCONN; + } +#endif + /* Check if we were awakened by signal. */ if (ret < 0) @@ -279,6 +292,15 @@ static ssize_t uart_write(FAR struct file *filep, FAR const char *buffer, size_t ssize_t nread = buflen; int ret; +#ifdef CONFIG_SERIAL_REMOVABLE + /* If the removable device is no longer connected, refuse to write to the device */ + + if (dev->disconnected) + { + return -ENOTCONN; + } +#endif + /* We may receive console writes through this path from interrupt handlers and * from debug output in the IDLE task! In these cases, we will need to do things * a little differently. @@ -395,6 +417,15 @@ static ssize_t uart_read(FAR struct file *filep, FAR char *buffer, size_t buflen int16_t tail; int ret; +#ifdef CONFIG_SERIAL_REMOVABLE + /* If the removable device is no longer connected, refuse to read from the device */ + + if (dev->disconnected) + { + return -ENOTCONN; + } +#endif + /* Only one user can access dev->recv.tail at a time */ ret = uart_takesem(&dev->recv.sem, true); @@ -525,9 +556,15 @@ static ssize_t uart_read(FAR struct file *filep, FAR char *buffer, size_t buflen ret = uart_takesem(&dev->recvsem, true); irqrestore(flags); - /* Was a signal received while waiting for data to be received? */ + /* Was a signal received while waiting for data to be + * received? Was a removable device disconnected? + */ +#ifdef CONFIG_SERIAL_REMOVABLE + if (ret < 0 || dev->disconnected) +#else if (ret < 0) +#endif { /* POSIX requires that we return after a signal is received. * If some bytes were read, we need to return the number of bytes @@ -541,7 +578,11 @@ static ssize_t uart_read(FAR struct file *filep, FAR char *buffer, size_t buflen * set the errno value appropriately. */ +#ifdef CONFIG_SERIAL_REMOVABLE + recvd = dev->disconnected ? -ENOTCONN : -EINTR; +#else recvd = -EINTR; +#endif } break; @@ -656,12 +697,12 @@ int uart_poll(FAR struct file *filep, FAR struct pollfd *fds, bool setup) if (ndx != dev->xmit.tail) { - eventset |= POLLOUT; + eventset |= (fds->events & POLLOUT); } uart_givesem(&dev->xmit.sem); - /* Check if the receive buffer is empty + /* Check if the receive buffer is empty. * * Get exclusive access to the recv buffer indices. NOTE: that we do not * let this wait be interrupted by a signal (we probably should, but that @@ -671,11 +712,20 @@ int uart_poll(FAR struct file *filep, FAR struct pollfd *fds, bool setup) (void)uart_takesem(&dev->recv.sem, false); if (dev->recv.head != dev->recv.tail) { - eventset |= POLLIN; + eventset |= (fds->events & POLLIN); } uart_givesem(&dev->recv.sem); +#ifdef CONFIG_SERIAL_REMOVABLE + /* Check if a removable device has been disconnected. */ + + if (dev->disconnected) + { + eventset |= (POLLERR|POLLHUP); + } +#endif + if (eventset) { uart_pollnotify(dev, eventset); @@ -796,6 +846,15 @@ static int uart_open(FAR struct file *filep) uint8_t tmp; int ret; +#ifdef CONFIG_SERIAL_REMOVABLE + /* If the removable device is no longer connected, refuse to open the device */ + + if (dev->disconnected) + { + return -ENOTCONN; + } +#endif + /* If the port is the middle of closing, wait until the close is finished. * If a signal is received while we are waiting, then return EINTR. */ @@ -915,10 +974,12 @@ int uart_register(FAR const char *path, FAR uart_dev_t *dev) void uart_datareceived(FAR uart_dev_t *dev) { - /* Awaken any awaiting read() operations */ + /* Is there a thread waiting for read data? */ if (dev->recvwaiting) { + /* Yes... wake it up */ + dev->recvwaiting = false; (void)sem_post(&dev->recvsem); } @@ -942,8 +1003,12 @@ void uart_datareceived(FAR uart_dev_t *dev) void uart_datasent(FAR uart_dev_t *dev) { + /* Is there a thread waiting for space in xmit.buffer? */ + if (dev->xmitwaiting) { + /* Yes... wake it up */ + dev->xmitwaiting = false; (void)sem_post(&dev->xmitsem); } @@ -953,4 +1018,64 @@ void uart_datasent(FAR uart_dev_t *dev) uart_pollnotify(dev, POLLOUT); } +/************************************************************************************ + * Name: uart_connected + * + * Description: + * Serial devices (like USB serial) can be removed. In that case, the "upper + * half" serial driver must be informed that there is no longer a valid serial + * channel associated with the driver. + * + * In this case, the driver will terminate all pending transfers wint ENOTCONN and + * will refuse all further transactions while the "lower half" is disconnected. + * The driver will continue to be registered, but will be in an unusable state. + * + * Conversely, the "upper half" serial driver needs to know when the serial + * device is reconnected so that it can resume normal operations. + * + * Assumptions/Limitations: + * This function may be called from an interrupt handler. + * + ************************************************************************************/ + +#ifdef CONFIG_SERIAL_REMOVABLE +void uart_connected(FAR uart_dev_t *dev, bool connected) +{ + /* Is the device disconnected? */ + + dev->disconnected = !connected; + if (!connected) + { + /* Yes.. wake up all waiting threads. Each thread should detect the + * disconnection and return the ENOTCONN error. + */ + + /* Is there a thread waiting for space in xmit.buffer? */ + + if (dev->xmitwaiting) + { + /* Yes... wake it up */ + + dev->xmitwaiting = false; + (void)sem_post(&dev->xmitsem); + } + + /* Is there a thread waiting for read data? */ + + if (dev->recvwaiting) + { + /* Yes... wake it up */ + + dev->recvwaiting = false; + (void)sem_post(&dev->recvsem); + } + + /* Notify all poll/select waiters that and hangup/error occurred */ + + uart_pollnotify(dev, (POLLERR|POLLHUP)); + } +} +#endif + + diff --git a/nuttx/drivers/usbdev/Kconfig b/nuttx/drivers/usbdev/Kconfig index e17b38022..0752bb791 100644 --- a/nuttx/drivers/usbdev/Kconfig +++ b/nuttx/drivers/usbdev/Kconfig @@ -150,6 +150,7 @@ endif menuconfig PL2303 bool "Prolific PL2303 serial/USB converter emulation" default n + select SERIAL_REMOVABLE ---help--- This logic emulates the Prolific PL2303 serial/USB converter @@ -222,6 +223,7 @@ endif menuconfig CDCACM bool "USB Modem (CDC ACM) support" default n + select SERIAL_REMOVABLE ---help--- Enables USB Modem (CDC ACM) support diff --git a/nuttx/drivers/usbdev/cdcacm.c b/nuttx/drivers/usbdev/cdcacm.c index 97c9d7c77..9b6fae1d6 100644 --- a/nuttx/drivers/usbdev/cdcacm.c +++ b/nuttx/drivers/usbdev/cdcacm.c @@ -570,6 +570,14 @@ static void cdcacm_resetconfig(FAR struct cdcacm_dev_s *priv) priv->config = CDCACM_CONFIGIDNONE; + /* Inform the "upper half" driver that there is no (functional) USB + * connection. + */ + +#ifdef CONFIG_SERIAL_REMOVABLE + uart_connected(&priv->serdev, false); +#endif + /* Disable endpoints. This should force completion of all pending * transfers. */ @@ -731,10 +739,20 @@ static int cdcacm_setconfig(FAR struct cdcacm_dev_s *priv, uint8_t config) usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_RDSUBMIT), (uint16_t)-ret); goto errout; } + priv->nrdq++; } + /* We are successfully configured */ + priv->config = config; + + /* Inform the "upper half" driver that we are "open for business" */ + +#ifdef CONFIG_SERIAL_REMOVABLE + uart_connected(&priv->serdev, true); +#endif + return OK; errout: @@ -1575,12 +1593,20 @@ static void cdcacm_disconnect(FAR struct usbdevclass_driver_s *driver, } #endif - /* Reset the configuration */ + /* Inform the "upper half serial driver that we have lost the USB serial + * connection. + */ flags = irqsave(); +#ifdef CONFIG_SERIAL_REMOVABLE + uart_connected(&priv->serdev, false); +#endif + + /* Reset the configuration */ + cdcacm_resetconfig(priv); - /* Clear out all data in the circular buffer */ + /* Clear out all outgoing data in the circular buffer */ priv->serdev.xmit.head = 0; priv->serdev.xmit.tail = 0; @@ -2045,12 +2071,17 @@ int cdcacm_classobject(int minor, FAR struct usbdevclass_driver_s **classdev) /* Initialize the serial driver sub-structure */ - priv->serdev.recv.size = CONFIG_CDCACM_RXBUFSIZE; - priv->serdev.recv.buffer = priv->rxbuffer; - priv->serdev.xmit.size = CONFIG_CDCACM_TXBUFSIZE; - priv->serdev.xmit.buffer = priv->txbuffer; - priv->serdev.ops = &g_uartops; - priv->serdev.priv = priv; + /* The initial state is disconnected */ + +#ifdef CONFIG_SERIAL_REMOVABLE + priv->serdev.disconnected = true; +#endif + priv->serdev.recv.size = CONFIG_CDCACM_RXBUFSIZE; + priv->serdev.recv.buffer = priv->rxbuffer; + priv->serdev.xmit.size = CONFIG_CDCACM_TXBUFSIZE; + priv->serdev.xmit.buffer = priv->txbuffer; + priv->serdev.ops = &g_uartops; + priv->serdev.priv = priv; /* Initialize the USB class driver structure */ diff --git a/nuttx/drivers/usbdev/pl2303.c b/nuttx/drivers/usbdev/pl2303.c index d10539fa7..98163f133 100644 --- a/nuttx/drivers/usbdev/pl2303.c +++ b/nuttx/drivers/usbdev/pl2303.c @@ -983,6 +983,14 @@ static void usbclass_resetconfig(FAR struct pl2303_dev_s *priv) priv->config = PL2303_CONFIGIDNONE; + /* Inform the "upper half" driver that there is no (functional) USB + * connection. + */ + +#ifdef CONFIG_SERIAL_REMOVABLE + uart_connected(&priv->serdev, false); +#endif + /* Disable endpoints. This should force completion of all pending * transfers. */ @@ -1112,10 +1120,20 @@ static int usbclass_setconfig(FAR struct pl2303_dev_s *priv, uint8_t config) usbtrace(TRACE_CLSERROR(USBSER_TRACEERR_RDSUBMIT), (uint16_t)-ret); goto errout; } + priv->nrdq++; } + /* We are successfully configured */ + priv->config = config; + + /* Inform the "upper half" driver that we are "open for business" */ + +#ifdef CONFIG_SERIAL_REMOVABLE + uart_connected(&priv->serdev, true); +#endif + return OK; errout: @@ -1844,12 +1862,20 @@ static void usbclass_disconnect(FAR struct usbdevclass_driver_s *driver, } #endif - /* Reset the configuration */ + /* Inform the "upper half serial driver that we have lost the USB serial + * connection. + */ flags = irqsave(); +#ifdef CONFIG_SERIAL_REMOVABLE + uart_connected(&priv->serdev, false); +#endif + + /* Reset the configuration */ + usbclass_resetconfig(priv); - /* Clear out all data in the circular buffer */ + /* Clear out all outgoing data in the circular buffer */ priv->serdev.xmit.head = 0; priv->serdev.xmit.tail = 0; @@ -2185,12 +2211,15 @@ int usbdev_serialinitialize(int minor) /* Initialize the serial driver sub-structure */ - priv->serdev.recv.size = CONFIG_PL2303_RXBUFSIZE; - priv->serdev.recv.buffer = priv->rxbuffer; - priv->serdev.xmit.size = CONFIG_PL2303_TXBUFSIZE; - priv->serdev.xmit.buffer = priv->txbuffer; - priv->serdev.ops = &g_uartops; - priv->serdev.priv = priv; +#ifdef CONFIG_SERIAL_REMOVABLE + priv->serdev.disconnected = true; +#endif + priv->serdev.recv.size = CONFIG_PL2303_RXBUFSIZE; + priv->serdev.recv.buffer = priv->rxbuffer; + priv->serdev.xmit.size = CONFIG_PL2303_TXBUFSIZE; + priv->serdev.xmit.buffer = priv->txbuffer; + priv->serdev.ops = &g_uartops; + priv->serdev.priv = priv; /* Initialize the USB class driver structure */ diff --git a/nuttx/include/nuttx/serial/serial.h b/nuttx/include/nuttx/serial/serial.h index 1c40f1b6b..57bcf1f27 100644 --- a/nuttx/include/nuttx/serial/serial.h +++ b/nuttx/include/nuttx/serial/serial.h @@ -1,7 +1,7 @@ /************************************************************************************ * include/nuttx/serial/serial.h * - * Copyright (C) 2007-2008, 2012 Gregory Nutt. All rights reserved. + * Copyright (C) 2007-2008, 2012-2013 Gregory Nutt. All rights reserved. * Author: Gregory Nutt <gnutt@nuttx.org> * * Redistribution and use in source and binary forms, with or without @@ -46,6 +46,7 @@ #include <stdint.h> #include <stdbool.h> #include <semaphore.h> + #include <nuttx/fs/fs.h> /************************************************************************************ @@ -190,20 +191,23 @@ struct uart_ops_s struct uart_dev_s { - uint8_t open_count; /* Number of times the device has been opened */ - volatile bool xmitwaiting; /* true: User waiting for space in xmit.buffer */ - volatile bool recvwaiting; /* true: User waiting for data in recv.buffer */ - bool isconsole; /* true: This is the serial console */ - sem_t closesem; /* Locks out new open while close is in progress */ - sem_t xmitsem; /* Wakeup user waiting for space in xmit.buffer */ - sem_t recvsem; /* Wakeup user waiting for data in recv.buffer */ + uint8_t open_count; /* Number of times the device has been opened */ + volatile bool xmitwaiting; /* true: User waiting for space in xmit.buffer */ + volatile bool recvwaiting; /* true: User waiting for data in recv.buffer */ +#ifdef CONFIG_SERIAL_REMOVABLE + volatile bool disconnected; /* true: Removable device is not connected */ +#endif + bool isconsole; /* true: This is the serial console */ + sem_t closesem; /* Locks out new open while close is in progress */ + sem_t xmitsem; /* Wakeup user waiting for space in xmit.buffer */ + sem_t recvsem; /* Wakeup user waiting for data in recv.buffer */ #ifndef CONFIG_DISABLE_POLL - sem_t pollsem; /* Manages exclusive access to fds[] */ + sem_t pollsem; /* Manages exclusive access to fds[] */ #endif - struct uart_buffer_s xmit; /* Describes transmit buffer */ - struct uart_buffer_s recv; /* Describes receive buffer */ - FAR const struct uart_ops_s *ops; /* Arch-specific operations */ - FAR void *priv; /* Used by the arch-specific logic */ + struct uart_buffer_s xmit; /* Describes transmit buffer */ + struct uart_buffer_s recv; /* Describes receive buffer */ + FAR const struct uart_ops_s *ops; /* Arch-specific operations */ + FAR void *priv; /* Used by the arch-specific logic */ /* The following is a list if poll structures of threads waiting for * driver events. The 'struct pollfd' reference for each open is also @@ -213,27 +217,28 @@ struct uart_dev_s #ifndef CONFIG_DISABLE_POLL struct pollfd *fds[CONFIG_SERIAL_NPOLLWAITERS]; #endif - }; + typedef struct uart_dev_s uart_dev_t; /************************************************************************************ * Public Data ************************************************************************************/ -/************************************************************************************ - * Public Functions - ************************************************************************************/ - #undef EXTERN #if defined(__cplusplus) #define EXTERN extern "C" -extern "C" { +extern "C" +{ #else #define EXTERN extern #endif /************************************************************************************ + * Public Functions + ************************************************************************************/ + +/************************************************************************************ * Name: uart_register * * Description: @@ -241,7 +246,7 @@ extern "C" { * ************************************************************************************/ -EXTERN int uart_register(FAR const char *path, FAR uart_dev_t *dev); +int uart_register(FAR const char *path, FAR uart_dev_t *dev); /************************************************************************************ * Name: uart_xmitchars @@ -254,7 +259,7 @@ EXTERN int uart_register(FAR const char *path, FAR uart_dev_t *dev); * ************************************************************************************/ -EXTERN void uart_xmitchars(FAR uart_dev_t *dev); +void uart_xmitchars(FAR uart_dev_t *dev); /************************************************************************************ * Name: uart_receivechars @@ -267,7 +272,7 @@ EXTERN void uart_xmitchars(FAR uart_dev_t *dev); * ************************************************************************************/ -EXTERN void uart_recvchars(FAR uart_dev_t *dev); +void uart_recvchars(FAR uart_dev_t *dev); /************************************************************************************ * Name: uart_datareceived @@ -279,7 +284,7 @@ EXTERN void uart_recvchars(FAR uart_dev_t *dev); * ************************************************************************************/ -EXTERN void uart_datareceived(FAR uart_dev_t *dev); +void uart_datareceived(FAR uart_dev_t *dev); /************************************************************************************ * Name: uart_datasent @@ -292,7 +297,31 @@ EXTERN void uart_datareceived(FAR uart_dev_t *dev); * ************************************************************************************/ -EXTERN void uart_datasent(FAR uart_dev_t *dev); +void uart_datasent(FAR uart_dev_t *dev); + +/************************************************************************************ + * Name: uart_connected + * + * Description: + * Serial devices (like USB serial) can be removed. In that case, the "upper + * half" serial driver must be informed that there is no longer a valid serial + * channel associated with the driver. + * + * In this case, the driver will terminate all pending transfers wint ENOTCONN and + * will refuse all further transactions while the "lower half" is disconnected. + * The driver will continue to be registered, but will be in an unusable state. + * + * Conversely, the "upper half" serial driver needs to know when the serial + * device is reconnected so that it can resume normal operations. + * + * Assumptions/Limitations: + * This function may be called from an interrupt handler. + * + ************************************************************************************/ + +#ifdef CONFIG_SERIAL_REMOVABLE +void uart_connected(FAR uart_dev_t *dev, bool connected); +#endif #undef EXTERN #if defined(__cplusplus) |