+++ /dev/null
-/*!
- * \file
- * <!--
- * Copyright 2003, 2004 Develer S.r.l. (http://www.develer.com/)
- * Copyright 2000 Bernardo Innocenti <bernie@codewiz.org>
- * This file is part of DevLib - See devlib/README for information.
- * -->
- *
- * \brief Buffered serial I/O driver
- *
- * The serial rx interrupt buffers incoming data in a software FIFO
- * to decouple the higher level protocols from the line speed.
- * Outgoing data is buffered as well for better performance.
- * This driver is not optimized for best performance, but it
- * has proved to be fast enough to handle transfer rates up to
- * 38400bps on a 16MHz 80196.
- *
- * MODULE CONFIGURATION
- *
- * \li \c CONFIG_SER_HWHANDSHAKE - set to 1 to enable RTS/CTS handshake.
- * Support is incomplete/untested.
- * \li \c CONFIG_SER_TXTIMEOUT - Enable software serial transmission timeouts
- *
- *
- * \version $Id$
- * \author Bernardo Innocenti <bernie@develer.com>
- */
-
-/*
- * $Log$
- * Revision 1.9 2004/08/08 06:06:20 bernie
- * Use new-style CONFIG_ idiom; Fix module-wide documentation.
- *
- * Revision 1.8 2004/07/29 22:57:09 bernie
- * ser_drain(): New function; Make Serial::is_open a debug-only feature; Switch to new-style CONFIG_* macros.
- *
- * Revision 1.7 2004/07/18 21:49:03 bernie
- * Make CONFIG_SER_DEFBAUDRATE optional.
- *
- * Revision 1.6 2004/06/07 15:56:28 aleph
- * Remove cast-as-lvalue extension abuse
- *
- * Revision 1.5 2004/06/06 16:41:44 bernie
- * ser_putchar(): Use fifo_push_locked() to fix potential race on 8bit processors.
- *
- * Revision 1.4 2004/06/03 11:27:09 bernie
- * Add dual-license information.
- *
- * Revision 1.3 2004/06/02 21:35:24 aleph
- * Serial enhancements: interruptible receive handler and 8 bit serial status for AVR; remove volatile attribute to FIFOBuffer, useless for new fifobuf routens
- *
- * Revision 1.2 2004/05/23 18:21:53 bernie
- * Trim CVS logs and cleanup header info.
- *
- */
-
-#include <mware/formatwr.h>
-#include <drv/kdebug.h>
-#include "ser.h"
-#include "ser_p.h"
-#include "hw.h"
-
-#ifdef CONFIG_KERNEL
- #include <kern/proc.h>
-#endif
-#if CONFIG_SER_TXTIMEOUT != -1 || CONFIG_SER_RXTIMEOUT != -1
- #include <drv/timer.h>
-#endif
-
-
-/* Serial configuration parameters */
-#define SER_CTSDELAY 70 /*!< CTS line retry interval (ms) */
-#define SER_TXPOLLDELAY 2 /*!< Transmit buffer full retry interval (ms) */
-#define SER_RXPOLLDELAY 2 /*!< Receive buffer empty retry interval (ms) */
-
-
-struct Serial ser_handles[SER_CNT];
-
-
-/*!
- * Inserisce il carattere c nel buffer di trasmissione.
- * Questa funzione mette il processo chiamante in attesa
- * quando il buffer e' pieno.
- *
- * \return EOF in caso di errore o timeout, altrimenti
- * il carattere inviato.
- */
-int ser_putchar(int c, struct Serial *port)
-{
- if (fifo_isfull_locked(&port->txfifo))
- {
-#if CONFIG_SER_TXTIMEOUT != -1
- time_t start_time = timer_gettick();
-#endif
-
- /* Attende finche' il buffer e' pieno... */
- do
- {
-#if defined(CONFIG_KERN_SCHED) && CONFIG_KERN_SCHED
- /* Give up timeslice to other processes. */
- proc_switch();
-#endif
-#if CONFIG_SER_TXTIMEOUT != -1
- if (timer_gettick() - start_time >= port->txtimeout)
- {
- port->status |= SERRF_TXTIMEOUT;
- return EOF;
- }
-#endif /* CONFIG_SER_TXTIMEOUT */
- }
- while (fifo_isfull_locked(&port->txfifo));
- }
-
- fifo_push_locked(&port->txfifo, (unsigned char)c);
-
- /* (re)trigger tx interrupt */
- port->hw->table->enabletxirq(port->hw);
-
- /* Avoid returning signed estended char */
- return (int)((unsigned char)c);
-}
-
-
-/*!
- * Preleva un carattere dal buffer di ricezione.
- * Questa funzione mette il processo chiamante in attesa
- * quando il buffer e' vuoto. L'attesa ha un timeout
- * di ser_rxtimeout millisecondi.
- *
- * \return EOF in caso di errore o timeout, altrimenti
- * il carattere ricevuto.
- */
-int ser_getchar(struct Serial *port)
-{
- int result;
-
- if (fifo_isempty_locked(&port->rxfifo))
- {
-#if CONFIG_SER_RXTIMEOUT != -1
- time_t start_time = timer_gettick();
-#endif
- /* Wait while buffer is empty */
- do
- {
-#if defined(CONFIG_KERN_SCHED) && CONFIG_KERN_SCHED
- /* Give up timeslice to other processes. */
- proc_switch();
-#endif
-#if CONFIG_SER_RXTIMEOUT != -1
- if (timer_gettick() - start_time >= port->rxtimeout)
- {
- port->status |= SERRF_RXTIMEOUT;
- return EOF;
- }
-#endif /* CONFIG_SER_RXTIMEOUT */
- }
- while (fifo_isempty_locked(&port->rxfifo));
- }
-
- /*
- * Get a byte from the FIFO (avoiding sign-extension),
- * re-enable RTS, then return result.
- */
- result = (int)(unsigned char)fifo_pop(&port->rxfifo);
- return port->status ? EOF : result;
-}
-
-
-/*!
- * Preleva un carattere dal buffer di ricezione.
- * Se il buffer e' vuoto, ser_getchar_nowait() ritorna
- * immediatamente EOF.
- */
-int ser_getchar_nowait(struct Serial *port)
-{
- if (fifo_isempty_locked(&port->rxfifo))
- return EOF;
-
- /* NOTE: the double cast prevents unwanted sign extension */
- return (int)(unsigned char)fifo_pop(&port->rxfifo);
-}
-
-
-#if CONFIG_SER_GETS
-/*!
- * Read a line long at most as size and puts it
- * in buf.
- * \return number of chars read or EOF in case
- * of error.
- */
-int ser_gets(struct Serial *port, char *buf, int size)
-{
- return ser_gets_echo(port, buf, size, false);
-}
-
-
-/*!
- * Read a line long at most as size and put it
- * in buf, with optional echo.
- *
- * \return number of chars read, or EOF in case
- * of error.
- */
-int ser_gets_echo(struct Serial *port, char *buf, int size, bool echo)
-{
- int i = 0;
- int c;
-
- for (;;)
- {
- if ((c = ser_getchar(port)) == EOF)
- {
- buf[i] = '\0';
- return -1;
- }
-
- /* FIXME */
- if (c == '\r' || c == '\n' || i >= size-1)
- {
- buf[i] = '\0';
- if (echo)
- ser_print(port, "\r\n");
- break;
- }
- buf[i++] = c;
- if (echo)
- ser_putchar(c, port);
- }
-
- return i;
-}
-#endif /* !CONFIG_SER_GETS */
-
-
-/*!
- * Read at most size bytes and puts them
- * in buf.
- * \return number of bytes read or EOF in case
- * of error.
- */
-int ser_read(struct Serial *port, char *buf, size_t size)
-{
- size_t i = 0;
- int c;
-
- while (i < size)
- {
- if ((c = ser_getchar(port)) == EOF)
- return EOF;
- buf[i++] = c;
- }
-
- return i;
-}
-
-
-/*!
- * Write a string to serial.
- * \return 0 if OK, EOF in case of error.
- */
-int ser_print(struct Serial *port, const char *s)
-{
- while (*s)
- {
- if (ser_putchar(*s++, port) == EOF)
- return EOF;
- }
- return 0;
-}
-
-
-/*!
- * \brief Write a buffer to serial.
- *
- * \return 0 if OK, EOF in case of error.
- *
- * \todo Optimize with fifo_pushblock()
- */
-int ser_write(struct Serial *port, const void *_buf, size_t len)
-{
- const char *buf = _buf;
-
- while (len--)
- {
- if (ser_putchar(*buf++, port) == EOF)
- return EOF;
- }
- return 0;
-}
-
-
-#if CONFIG_PRINTF
-/*!
- * Formatted write
- */
-int ser_printf(struct Serial *port, const char *format, ...)
-{
- va_list ap;
- int len;
-
- ser_setstatus(port, 0);
- va_start(ap, format);
- len = _formatted_write(format, (void (*)(char, void *))ser_putchar, port, ap);
- va_end(ap);
-
- return len;
-}
-#endif /* CONFIG_PRINTF */
-
-
-#if CONFIG_SER_RXTIMEOUT != -1 || CONFIG_SER_TXTIMEOUT != -1
-void ser_settimeouts(struct Serial *port, time_t rxtimeout, time_t txtimeout)
-{
- port->rxtimeout = rxtimeout;
- port->txtimeout = txtimeout;
-}
-#endif /* CONFIG_SER_RXTIMEOUT || CONFIG_SER_TXTIMEOUT */
-
-
-void ser_setbaudrate(struct Serial *port, unsigned long rate)
-{
- port->hw->table->setbaudrate(port->hw, rate);
-}
-
-
-void ser_setparity(struct Serial *port, int parity)
-{
- port->hw->table->setparity(port->hw, parity);
-}
-
-
-/*!
- * Flush both the RX and TX buffers.
- */
-void ser_purge(struct Serial *ser)
-{
- fifo_flush_locked(&ser->rxfifo);
- fifo_flush_locked(&ser->txfifo);
-}
-
-/*!
- * Wait until all pending output is completely
- * transmitted to the other end.
- *
- * \note The current implementation only checks the
- * software transmission queue. Any hardware
- * FIFOs are ignored.
- */
-void ser_drain(struct Serial *ser)
-{
- while(!fifo_isempty(&ser->txfifo))
- {
-#if defined(CONFIG_KERN_SCHED) && CONFIG_KERN_SCHED
- /* Give up timeslice to other processes. */
- proc_switch();
-#endif
- }
-}
-
-
-/*!
- * Initialize serial
- */
-struct Serial *ser_open(unsigned int unit)
-{
- struct Serial *port;
-
- ASSERT(unit < countof(ser_handles));
- port = &ser_handles[unit];
-
- ASSERT(!port->is_open);
- DB(port->is_open = true;)
-
- port->unit = unit;
-
- /* Initialize circular buffer */
- fifo_init(&port->rxfifo, port->rxbuffer, sizeof(port->rxbuffer));
- fifo_init(&port->txfifo, port->txbuffer, sizeof(port->txbuffer));
-
- port->hw = ser_hw_getdesc(unit);
- port->hw->table->init(port->hw, port);
-
- /* Set default values */
-#if CONFIG_SER_RXTIMEOUT != -1 || CONFIG_SER_TXTIMEOUT != -1
- ser_settimeouts(port, CONFIG_SER_RXTIMEOUT, CONFIG_SER_TXTIMEOUT);
-#endif
-#if CONFIG_SER_DEFBAUDRATE
- ser_setbaudrate(port, CONFIG_SER_DEFBAUDRATE);
-#endif
-
- return port;
-}
-
-
-/*!
- * Clean up serial port, disabling the associated hardware.
- */
-void ser_close(struct Serial *port)
-{
- ASSERT(port->is_open);
- DB(port->is_open = false;)
-
- port->hw->table->cleanup(port->hw);
- port->hw = NULL;
-}
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