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Added serial driver

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@201 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2007-05-04 01:30:48 +00:00
parent 28728db69c
commit f6ba15a866
5 changed files with 732 additions and 17 deletions
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28
arch/arm/include/lpc214x/irq.h
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@ -1,4 +1,4 @@
/************************************************************
/****************************************************************************
* arch/lpc214x/irq.h
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
@ -31,7 +31,7 @@
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
************************************************************/
****************************************************************************/
/* This file should never be included directed but, rather,
* only indirectly through nuttx/irq.h
@ -40,13 +40,13 @@
#ifndef __ARCH_LPC214X_IRQ_H
#define __ARCH_LPC214X_IRQ_H
/************************************************************
/****************************************************************************
* Included Files
************************************************************/
****************************************************************************/
/************************************************************
/****************************************************************************
* Definitions
************************************************************/
****************************************************************************/
/* LPC214X Interrupts */
@ -76,25 +76,25 @@
#define NR_IRQS 23
/************************************************************
/****************************************************************************
* Public Types
************************************************************/
****************************************************************************/
#ifndef __ASSEMBLY__
typedef void (*vic_vector_t)(uint32 *regs);
#endif
/************************************************************
/****************************************************************************
* Inline functions
************************************************************/
****************************************************************************/
/************************************************************
/****************************************************************************
* Public Variables
************************************************************/
****************************************************************************/
/************************************************************
/****************************************************************************
* Public Function Prototypes
************************************************************/
****************************************************************************/
#ifndef __ASSEMBLY__
#ifdef __cplusplus

4
arch/arm/src/lpc214x/Make.defs
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@ -45,4 +45,6 @@ CMN_CSRCS = up_allocateheap.c up_assert.c up_blocktask.c up_copystate.c \
up_undefinedinsn.c up_usestack.c
CHIP_ASRCS = lpc214x_lowputc.S
CHIP_CSRCS = lpc214x_decodeirq.c lpc214x_irq.c lpc214x_timerisr.c
CHIP_CSRCS = lpc214x_decodeirq.c lpc214x_irq.c lpc214x_timerisr.c \
lpc214x_serial.c

2
arch/arm/src/lpc214x/lpc214x_lowputc.S
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@ -166,7 +166,7 @@ up_lowsetup:
ldr r0, =LPC214X_PINSEL0
ldr r1, [r0]
ldr r2, =LPC214X_UART_PINMASK
ldr r2, =~LPC214X_UART_PINMASK
and r1, r2
ldr r2, =LPC214X_UART_PINSEL
orr r1, r2

712
arch/arm/src/lpc214x/lpc214x_serial.c Normal file
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@ -0,0 +1,712 @@
/****************************************************************************
* lpc214x/lpc214x_serial.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 Gregory Nutt 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 <nuttx/config.h>
#include <sys/types.h>
#include <unistd.h>
#include <semaphore.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/irq.h>
#include <nuttx/arch.h>
#include <nuttx/serial.h>
#include <arch/serial.h>
#include "up_arch.h"
#include "os_internal.h"
#include "up_internal.h"
#include "lpc214x_uart.h"
/****************************************************************************
* Definitions
****************************************************************************/
#define BASE_BAUD 115200
/****************************************************************************
* Private Types
****************************************************************************/
struct up_dev_s
{
uint32 uartbase; /* Base address of UART registers */
uint32 baud; /* Configured baud */
ubyte ier; /* Saved IER value */
ubyte irq; /* IRQ associated with this UART */
ubyte parity; /* 0=none, 1=odd, 2=even */
ubyte bits; /* Number of bits (7 or 8) */
boolean stopbits2; /* TRUE: Configure with 2 stop bits instead of 1 */
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int up_setup(struct uart_dev_s *dev);
static void up_shutdown(struct uart_dev_s *dev);
static int up_interrupt(int irq, void *context);
static int up_ioctl(struct file *filep, int cmd, unsigned long arg);
static int up_receive(struct uart_dev_s *dev, uint32 *status);
static void up_rxint(struct uart_dev_s *dev, boolean enable);
static boolean up_rxfifonotempty(struct uart_dev_s *dev);
static void up_send(struct uart_dev_s *dev, int ch);
static void up_txint(struct uart_dev_s *dev, boolean enable);
static boolean up_txfifonotfull(struct uart_dev_s *dev);
static boolean up_txfifoempty(struct uart_dev_s *dev);
/****************************************************************************
* Private Variables
****************************************************************************/
struct uart_ops_s g_uart_ops =
{
.setup = up_setup,
.shutdown = up_shutdown,
.handler = up_interrupt,
.ioctl = up_ioctl,
.receive = up_receive,
.rxint = up_rxint,
.rxfifonotempty = up_rxfifonotempty,
.send = up_send,
.txint = up_txint,
.txfifonotfull = up_txfifonotfull,
.txfifoempty = up_txfifoempty,
};
/* I/O buffers */
static char g_uart0rxbuffer[CONFIG_UART0_RXBUFSIZE];
static char g_uart0txbuffer[CONFIG_UART0_TXBUFSIZE];
static char g_uart1rxbuffer[CONFIG_UART1_RXBUFSIZE];
static char g_uart1txbuffer[CONFIG_UART1_TXBUFSIZE];
/* This describes the state of the LPC214X uart0 port. */
static struct up_dev_s g_uart0priv =
{
.uartbase = LPC214X_UART0_BASE,
.baud = CONFIG_UART0_BAUD,
.parity = CONFIG_UART0_PARITY,
.bits = CONFIG_UART0_BITS,
.stopbits2 = CONFIG_UART0_2STOP,
};
static uart_dev_t g_uart0port =
{
.irq = LPC214X_UART0_IRQ,
.recv =
{
.size = CONFIG_UART0_RXBUFSIZE,
.buffer = g_uart0rxbuffer,
},
.xmit =
{
.size = CONFIG_UART0_TXBUFSIZE,
.buffer = g_uart0txbuffer,
},
.ops = &g_uart_ops,
.priv = &g_uart0priv,
};
/* This describes the state of the LPC214X uart1 port. */
static struct up_dev_s g_uart1priv =
{
.uartbase = LPC214X_UART1_BASE,
.baud = CONFIG_UART1_BAUD,
.parity = CONFIG_UART1_PARITY,
.bits = CONFIG_UART1_BITS,
.stopbits2 = CONFIG_UART1_2STOP,
};
static uart_dev_t g_uart1port =
{
.irq = LPC214X_UART1_IRQ,
.recv =
{
.size = CONFIG_UART1_RXBUFSIZE,
.buffer = g_uart1rxbuffer,
},
.xmit =
{
.size = CONFIG_UART1_TXBUFSIZE,
.buffer = g_uart1txbuffer,
},
.ops = &g_uart_ops,
.priv = &g_uart1priv,
};
/* Now, which one with be tty0/console and which tty1? */
#ifdef CONFIG_SERIAL_IRDA_CONSOLE
# define CONSOLE_DEV g_uart1port
# define TTYS0_DEV g_uart1port
# define TTYS1_DEV g_uart0port
#else
# define CONSOLE_DEV g_uart0port
# define TTYS0_DEV g_uart0port
# define TTYS1_DEV g_uart1port
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: up_serialin
****************************************************************************/
static inline ubyte up_serialin(struct up_dev_s *priv, int offset)
{
return getreg16(priv->uartbase + offset);
}
/****************************************************************************
* Name: up_serialout
****************************************************************************/
static inline void up_serialout(struct up_dev_s *priv, int offset, ubyte value)
{
putreg16(value, priv->uartbase + offset);
}
/****************************************************************************
* Name: up_disableuartint
****************************************************************************/
static inline void up_disableuartint(struct up_dev_s *priv, ubyte *ier)
{
if (ier)
{
*ier = priv->ier & LPC214X_IER_ALLIE;
}
priv->ier &= ~LPC214X_IER_ALLIE;
up_serialout(priv, LPC214X_IER_OFFSET, priv->ier);
}
/****************************************************************************
* Name: up_restoreuartint
****************************************************************************/
static inline void up_restoreuartint(struct up_dev_s *priv, ubyte ier)
{
priv->ier |= ier & LPC214X_IER_ALLIE;
up_serialout(priv, LPC214X_IER_OFFSET, priv->ier);
}
/****************************************************************************
* Name: up_waittxfifonotfull
****************************************************************************/
static inline void up_waittxfifonotfull(struct up_dev_s *priv)
{
int tmp;
/* Limit how long we will wait for the TX available condition */
for (tmp = 1000 ; tmp > 0 ; tmp--)
{
/* Check if the tranmitter holding register (THR) is empty */
if ((up_serialin(priv, LPC214X_LSR_OFFSET) & LPC214X_LSR_THRE) != 0)
{
/* The THR is empty, return */
break;
}
}
}
/****************************************************************************
* Name: up_enablebreaks
****************************************************************************/
static inline void up_enablebreaks(struct up_dev_s *priv, boolean enable)
{
ubyte lcr = up_serialin(priv, LPC214X_LCR_OFFSET);
if (enable)
{
lcr |= LPC214X_LCR_BREAK_ENABLE;
}
else
{
lcr &= ~LPC214X_LCR_BREAK_ENABLE;
}
up_serialout(priv, LPC214X_LCR_OFFSET, lcr);
}
/****************************************************************************
* Name: up_setup
*
* Description:
* Configure the UART baud, bits, parity, fifos, etc. This
* method is called the first time that the serial port is
* opened.
*
****************************************************************************/
static int up_setup(struct uart_dev_s *dev)
{
#ifdef CONFIG_SUPPRESS_LPC214X_UART_CONFIG
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
uint16 baud;
ubyte lcr;
/* Clear fifos */
up_serialout(priv, LPC214X_FCR_OFFSET, (LPC214X_FCR_RX_FIFO_RESET|LPC214X_FCR_TX_FIFO_RESET));
/* Set trigger */
up_serialout(priv, LPC214X_FCR_OFFSET, (LPC214X_FCR_FIFO_ENABLE|LPC214X_FCR_FIFO_TRIG14));
/* Set up the IER */
priv->ier = up_serialin(priv, LPC214X_IER_OFFSET);
/* Set up the LCR */
lcr = 0;
if (priv->bits == 7)
{
lcr |= LPC214X_LCR_CHAR_7;
}
else
{
lcr |= LPC214X_LCR_CHAR_8;
}
if (priv->stopbits2)
{
lcr |= LPC214X_LCR_STOP_2;
}
if (priv->parity == 1)
{
lcr |= LPC214X_LCR_PAR_ODD;
}
else if (priv->parity == 2)
{
lcr |= LPC214X_LCR_PAR_EVEN;
}
/* Enter DLAB=1 */
up_serialout(priv, LPC214X_LCR_OFFSET, (lcr | LPC214X_LCR_DLAB_ENABLE));
/* Set the BAUD divisor */
baud = UART_BAUD(priv->baud);
up_serialout(priv, LPC214X_DLM_OFFSET, baud >> 8);
up_serialout(priv, LPC214X_DLL_OFFSET, baud & 0xff);
/* Clear DLAB */
up_serialout(priv, LPC214X_LCR_OFFSET, lcr);
#endif
return OK;
}
/****************************************************************************
* Name: up_shutdown
*
* Description:
* Disable the UART. This method is called when the serial
* port is closed
*
****************************************************************************/
static void up_shutdown(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
up_disableuartint(priv, NULL);
}
/****************************************************************************
* Name: up_interrupt
*
* Description:
* This is the UART interrupt handler. It will be invoked
* when an interrupt received on the 'irq' It should call
* uart_transmitchars or uart_receivechar to perform the
* appropriate data transfers. The interrupt handling logic\
* must be able to map the 'irq' number into the approprite
* uart_dev_s structure in order to call these functions.
*
****************************************************************************/
static int up_interrupt(int irq, void *context)
{
struct uart_dev_s *dev = NULL;
struct up_dev_s *priv;
ubyte status;
int passes;
if (g_uart1port.irq == irq)
{
dev = &g_uart1port;
}
else if (g_uart0port.irq == irq)
{
dev = &g_uart0port;
}
else
{
PANIC(OSERR_INTERNAL);
}
priv = (struct up_dev_s*)dev->priv;
/* Loop until there are no characters to be transferred or,
* until we have been looping for a long time.
*/
for( passes = 0; passes < 256; passes++)
{
/* Get the current UART status and check for loop
* termination conditions
*/
status = up_serialin(priv, LPC214X_IIR_OFFSET);
/* The NO INTERRUPT should be zero */
if (status != LPC214X_IIR_NO_INT)
{
/* Handline incoming, receive bytes (with or without timeout) */
if (status == LPC214X_IIR_RDA_INT || status == LPC214X_IIR_CTI_INT)
{
uart_recvchars(dev);
}
/* Handle outgoing, transmit bytes */
else if (status == LPC214X_IIR_THRE_INT)
{
uart_xmitchars(dev);
}
/* Just clear modem status interrupts */
else if (status == LPC214X_IIR_MS_INT)
{
/* Read the modem status regisgter (MSR) to clear */
(void)up_serialin(priv, LPC214X_MSR_OFFSET);
}
/* Just clear any line status interrupts */
else if (status == LPC214X_IIR_RLS_INT)
{
/* Read the line status register (LSR) to clear */
(void)up_serialin(priv, LPC214X_LSR_OFFSET);
}
}
}
return OK;
}
/****************************************************************************
* Name: up_ioctl
*
* Description:
* All ioctl calls will be routed through this method
*
****************************************************************************/
static int up_ioctl(struct file *filep, int cmd, unsigned long arg)
{
struct inode *inode = filep->f_inode;
struct uart_dev_s *dev = inode->i_private;
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
int ret = OK;
switch (cmd)
{
case TIOCSERGSTRUCT:
{
struct up_dev_s *user = (struct up_dev_s*)arg;
if (!user)
{
*get_errno_ptr() = EINVAL;
ret = ERROR;
}
else
{
memcpy(user, dev, sizeof(struct up_dev_s));
}
}
break;
case TIOCSBRK: /* BSD compatibility: Turn break on, unconditionally */
{
irqstate_t flags = irqsave();
up_enablebreaks(priv, TRUE);
irqrestore(flags);
}
break;
case TIOCCBRK: /* BSD compatibility: Turn break off, unconditionally */
{
irqstate_t flags;
flags = irqsave();
up_enablebreaks(priv, FALSE);
irqrestore(flags);
}
break;
default:
*get_errno_ptr() = ENOTTY;
ret = ERROR;
break;
}
return ret;
}
/****************************************************************************
* Name: up_receive
*
* Description:
* Called (usually) from the interrupt level to receive one
* character from the UART. Error bits associated with the
* receipt are provided in the the return 'status'.
*
****************************************************************************/
static int up_receive(struct uart_dev_s *dev, uint32 *status)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
ubyte rbr;
rbr = up_serialin(priv, LPC214X_RBR_OFFSET);
*status = up_serialin(priv, LPC214X_RBR_OFFSET);
return rbr;
}
/****************************************************************************
* Name: up_rxint
*
* Description:
* Call to enable or disable RX interrupts
*
****************************************************************************/
static void up_rxint(struct uart_dev_s *dev, boolean enable)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
if (enable)
{
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
priv->ier |= LPC214X_IER_ERBFI;
#endif
}
else
{
priv->ier &= ~LPC214X_IER_ERBFI;
}
up_serialout(priv, LPC214X_IER_OFFSET, priv->ier);
}
/****************************************************************************
* Name: up_rxfifonotempty
*
* Description:
* Return TRUE if the receive fifo is not empty
*
****************************************************************************/
static boolean up_rxfifonotempty(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
return ((up_serialin(priv, LPC214X_LSR_OFFSET) & LPC214X_LSR_RDR) != 0);
}
/****************************************************************************
* Name: up_send
*
* Description:
* This method will send one byte on the UART
*
****************************************************************************/
static void up_send(struct uart_dev_s *dev, int ch)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
up_serialout(priv, LPC214X_THR_OFFSET, (ubyte)ch);
}
/****************************************************************************
* Name: up_txint
*
* Description:
* Call to enable or disable TX interrupts
*
****************************************************************************/
static void up_txint(struct uart_dev_s *dev, boolean enable)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
if (enable)
{
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
priv->ier |= LPC214X_IER_ETBEI;
#endif
}
else
{
priv->ier &= ~LPC214X_IER_ETBEI;
}
up_serialout(priv, LPC214X_IER_OFFSET, priv->ier);
}
/****************************************************************************
* Name: up_txfifonotfull
*
* Description:
* Return TRUE if the tranmsit fifo is not full
*
****************************************************************************/
static boolean up_txfifonotfull(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
return ((up_serialin(priv, LPC214X_LSR_OFFSET) & LPC214X_LSR_THRE) != 0);
}
/****************************************************************************
* Name: up_txfifoempty
*
* Description:
* Return TRUE if the transmit fifo is empty
*
****************************************************************************/
static boolean up_txfifoempty(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
return ((up_serialin(priv, LPC214X_LSR_OFFSET) & LPC214X_LSR_THRE) != 0);
}
/****************************************************************************
* Public Funtions
****************************************************************************/
/****************************************************************************
* Name: up_serialinit
*
* Description:
* Performs the low level UART initialization early in
* debug so that the serial console will be available
* during bootup. This must be called before up_serialinit.
*
****************************************************************************/
void up_earlyserialinit(void)
{
/* Enable UART0 and 1 */
uint32 pinsel = getreg32(LPC214X_PINSEL0);
pinsel &= ~(LPC214X_UART0_PINMASK|LPC214X_UART1_PINMASK);
pinsel |= (LPC214X_UART0_PINSEL|LPC214X_UART1_PINSEL);
putreg32(pinsel, LPC214X_PINSEL0);
/* Disable both UARTS */
up_disableuartint(TTYS0_DEV.priv, NULL);
up_disableuartint(TTYS1_DEV.priv, NULL);
/* Configuration whichever on is the console */
CONSOLE_DEV.isconsole = TRUE;
up_setup(&CONSOLE_DEV);
}
/****************************************************************************
* Name: up_serialinit
*
* Description:
* Register serial console and serial ports. This assumes
* that up_earlyserialinit was called previously.
*
****************************************************************************/
void up_serialinit(void)
{
(void)uart_register("/dev/console", &CONSOLE_DEV);
(void)uart_register("/dev/ttyS0", &TTYS0_DEV);
(void)uart_register("/dev/ttyS1", &TTYS1_DEV);
}
/****************************************************************************
* Name: up_putc
*
* Description:
* Provide priority, low-level access to support OS debug
* writes
*
****************************************************************************/
int up_putc(int ch)
{
struct up_dev_s *priv = (struct up_dev_s*)CONSOLE_DEV.priv;
ubyte ier;
up_disableuartint(priv, &ier);
up_waittxfifonotfull(priv);
up_serialout(priv, LPC214X_THR_OFFSET, (ubyte)ch);
/* Check for LF */
if (ch == '\n')
{
/* Add CR */
up_waittxfifonotfull(priv);
up_serialout(priv, LPC214X_THR_OFFSET, '\r');
}
up_waittxfifonotfull(priv);
up_restoreuartint(priv, ier);
return ch;
}

3
arch/arm/src/lpc214x/lpc214x_uart.h
View File

@ -63,7 +63,8 @@
#define LPC214X_IER_ERBFI (1 << 0) /* Enable receive data available int */
#define LPC214X_IER_ETBEI (1 << 1) /* Enable THR empty Interrupt */
#define LPC214X_IER_ELSI (1 << 2) /* Enable receive line status int */
#define LPC214X_IER_EDSSI (1 << 3) /* Enable MODEM atatus interrupt */
#define LPC214X_IER_EDSSI (1 << 3) /* Enable MODEM atatus interrupt (2146/6/8 UART1 Only) */
#define LPC214X_IER_ALLIE 0x0f /* All interrupts */
/* Interrupt ID Register(IIR) bit definitions */