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nuttx-bb/nuttx/arch/arm/src/lpc2378/lpc23xx_serial.c

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/****************************************************************************
* arch/arm/src/lpc2378/lpc23xx_serial.c
*
* Copyright (C) 2010 Rommel Marcelo. All rights reserved.
* Author: Rommel Marcelo
*
* This file is part of the NuttX RTOS and based on the lpc2148 port:
*
* Copyright (C) 2010, 2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.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 "chip.h"
#include "up_arch.h"
#include "os_internal.h"
#include "internal.h"
#include "lpc23xx_scb.h"
#include "lpc23xx_pinsel.h"
#include "lpc23xx_uart.h"
#include "lpc23xx_vic.h"
#ifdef USE_SERIALDRIVER
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
struct up_dev_s
{
uint32_t uartbase; /* Base address of UART registers */
uint32_t baud; /* Configured baud */
uint8_t ier; /* Saved IER value */
uint8_t irq; /* IRQ associated with this UART */
uint8_t parity; /* 0=none, 1=odd, 2=even */
uint8_t bits; /* Number of bits (7 or 8) */
bool 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_attach(struct uart_dev_s *dev);
static void up_detach(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_t * status);
static void up_rxint(struct uart_dev_s *dev, bool enable);
static bool up_rxavailable(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, bool enable);
static bool up_txready(struct uart_dev_s *dev);
static bool up_txempty(struct uart_dev_s *dev);
/****************************************************************************
* Private Variables
****************************************************************************/
struct uart_ops_s g_uart_ops =
{
.setup = up_setup,
.shutdown = up_shutdown,
.attach = up_attach,
.detach = up_detach,
.ioctl = up_ioctl,
.receive = up_receive,
.rxint = up_rxint,
.rxavailable = up_rxavailable,
.send = up_send,
.txint = up_txint,
.txready = up_txready,
.txempty = up_txempty,
};
/* I/O buffers */
static char g_uart0rxbuffer[CONFIG_UART0_RXBUFSIZE];
static char g_uart0txbuffer[CONFIG_UART0_TXBUFSIZE];
static char g_uart2rxbuffer[CONFIG_UART2_RXBUFSIZE];
static char g_uart2txbuffer[CONFIG_UART2_TXBUFSIZE];
/* This describes the state of the LPC214X uart0 port. */
#ifdef CONFIG_UART0
static struct up_dev_s g_uart0priv =
{
.uartbase = UART0_BASE_ADDR,
.baud = CONFIG_UART0_BAUD,
.irq = UART0_IRQ,
.parity = CONFIG_UART0_PARITY,
.bits = CONFIG_UART0_BITS,
.stopbits2 = CONFIG_UART0_2STOP,
};
static uart_dev_t g_uart0port =
{
.recv =
{
.size = CONFIG_UART0_RXBUFSIZE,
.buffer = g_uart0rxbuffer,
},
.xmit =
{
.size = CONFIG_UART0_TXBUFSIZE,
.buffer = g_uart0txbuffer,
},
.ops = &g_uart_ops,
.priv = &g_uart0priv,
};
#endif
#ifdef CONFIG_UART2
/* This describes the state of the LPC23XX uart2 port. */
static struct up_dev_s g_uart2priv =
{
.uartbase = UART2_BASE_ADDR,
.baud = CONFIG_UART2_BAUD,
.irq = UART2_IRQ,
.parity = CONFIG_UART2_PARITY,
.bits = CONFIG_UART2_BITS,
.stopbits2 = CONFIG_UART2_2STOP,
};
static uart_dev_t g_uart2port =
{
.recv =
{
.size = CONFIG_UART2_RXBUFSIZE,
.buffer = g_uart2rxbuffer,
},
.xmit =
{
.size = CONFIG_UART2_TXBUFSIZE,
.buffer = g_uart2txbuffer,
},
.ops = &g_uart_ops,
.priv = &g_uart2priv,
};
#endif
/* Now, which one with be tty0/console and which tty1? */
#if defined(CONFIG_UART0_SERIAL_CONSOLE)
# define CONSOLE_DEV g_uart0port
# define TTYS0_DEV g_uart0port
# define TTYS1_DEV g_uart2port
#elif defined(CONFIG_UART1_SERIAL_CONSOLE)
# define CONSOLE_DEV g_uart2port
# define TTYS0_DEV g_uart2port
# define TTYS1_DEV g_uart0port
#else
# error "No CONFIG_UARTn_SERIAL_CONSOLE Setting"
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: up_serialin
****************************************************************************/
static inline uint8_t up_serialin(struct up_dev_s *priv, int offset)
{
return getreg8(priv->uartbase + offset);
}
/****************************************************************************
* Name: up_serialout
****************************************************************************/
static inline void up_serialout(struct up_dev_s *priv, int offset, uint8_t value)
{
putreg8(value, priv->uartbase + offset);
}
/****************************************************************************
* Name: up_disableuartint
****************************************************************************/
static inline void up_disableuartint(struct up_dev_s *priv, uint8_t * ier)
{
if (ier)
{
*ier = priv->ier & IER_ALLIE;
}
priv->ier &= ~IER_ALLIE;
up_serialout(priv, UART_IER_OFFSET, priv->ier);
}
/****************************************************************************
* Name: up_restoreuartint
****************************************************************************/
static inline void up_restoreuartint(struct up_dev_s *priv, uint8_t ier)
{
priv->ier |= ier & IER_ALLIE;
up_serialout(priv, UART_IER_OFFSET, priv->ier);
}
/****************************************************************************
* Name: up_waittxready
****************************************************************************/
static inline void up_waittxready(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, UART_LSR_OFFSET) & LSR_THRE) != 0)
{
/* The THR is empty, return */
break;
}
}
}
/****************************************************************************
* Name: up_enablebreaks
****************************************************************************/
static inline void up_enablebreaks(struct up_dev_s *priv, bool enable)
{
uint8_t lcr = up_serialin(priv, UART_LCR_OFFSET);
if (enable)
{
lcr |= LCR_BREAK_ENABLE;
}
else
{
lcr &= ~LCR_BREAK_ENABLE;
}
up_serialout(priv, UART_LCR_OFFSET, lcr);
}
/****************************************************************************
* Name: up_configbaud
****************************************************************************/
static inline void up_configbaud(struct up_dev_s *priv)
{
/* In a buckled-up, embedded system, there is no reason to constantly
* calculate the following. The calculation can be skipped if the MULVAL,
* DIVADDVAL, and DIVISOR values are provided in the configuration file.
*/
#ifndef CONFIG_UART_MULVAL
uint32_t qtrclk;
/* Test values calculated for every multiplier/divisor combination */
uint32_t tdiv;
uint32_t terr;
int tmulval;
int tdivaddval;
/* Optimal multiplier/divider values */
uint32_t div = 0;
uint32_t err = 100000;
int mulval = 1;
int divaddval = 0;
/* Baud is generated using FDR and DLL-DLM registers
*
* baud = clock * (mulval/(mulval+divaddval) / (16 * div)
*
* Or
*
* div = (clock/16) * (mulval/(mulval+divaddval) / baud
*
* Where mulval = Fractional divider multiplier
* divaddval = Fractional divider pre-scale div
* div = DLL-DLM divisor
*/
/* Get UART block clock divided by 16 */
qtrclk = U0_PCLK >> 4; /* TODO: Different Uart port with different clocking */
/* Try every valid multiplier, tmulval (or until a perfect match is found). */
for (tmulval = 1; tmulval <= 15 && err > 0; tmulval++)
{
/* Try every valid pre-scale div, tdivaddval (or until a perfect match is
* found).
*/
for (tdivaddval = 0; tdivaddval <= 15 && err > 0; tdivaddval++)
{
/* Calculate the divisor with these fractional divider settings */
uint32_t tmp = (tmulval * qtrclk) / ((tmulval + tdivaddval));
tdiv = (tmp + (priv->baud >> 1)) / priv->baud;
/* Check if this candidate divisor is within a valid range */
if (tdiv > 2 && tdiv < 0x10000)
{
/* Calculate the actual baud and the error */
uint32_t actualbaud = tmp / tdiv;
if (actualbaud <= priv->baud)
{
terr = priv->baud - actualbaud;
}
else
{
terr = actualbaud - priv->baud;
}
/* Is this the smallest error we have encountered? */
if (terr < err)
{
/* Yes, save these settings as the new, candidate optimal
* settings
*/
mulval = tmulval;
divaddval = tdivaddval;
div = tdiv;
err = terr;
}
}
}
}
/* Configure the MS and LS DLAB registers */
up_serialout(priv, UART_DLM_OFFSET, div >> 8);
up_serialout(priv, UART_DLL_OFFSET, div & 0xff);
/* Configure the Fractional Divider Register (FDR) */
up_serialout(priv, UART_FDR_OFFSET, ((mulval << 4) | divaddval));
#else
/* Configure the MS and LS DLAB registers */
up_serialout(priv, UART_DLM_OFFSET, DLMVAL >> 8);
up_serialout(priv, UART_DLL_OFFSET, DLLVAL & 0xff);
/* Configure the Fractional Divider Register (FDR) */
up_serialout(priv, UART_FDR_OFFSET, ((MULVAL << 4) | DIVADDVAL));
#endif
}
/****************************************************************************
* 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)
{
#ifndef CONFIG_SUPPRESS_LPC214X_UART_CONFIG
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
uint8_t lcr;
/* Clear fifos */
up_serialout(priv, UART_FCR_OFFSET, (FCR_RX_FIFO_RESET | FCR_TX_FIFO_RESET));
/* Set trigger */
up_serialout(priv, UART_FCR_OFFSET, (FCR_FIFO_ENABLE | FCR_FIFO_TRIG14));
/* Set up the IER */
priv->ier = up_serialin(priv, UART_IER_OFFSET);
/* Set up the Line Control Register */
lcr = 0;
lcr |= (priv->bits == 7) ? LCR_CHAR_7 : LCR_CHAR_8;
if (priv->stopbits2)
{
lcr |= LCR_STOP_2;
}
if (priv->parity == 1)
{
lcr |= LCR_PAR_ODD;
}
else if (priv->parity == 2)
{
lcr |= LCR_PAR_EVEN;
}
/* Enable access to latch divisor DLAB=1 */
up_serialout(priv, UART_LCR_OFFSET, (lcr | LCR_DLAB_ENABLE));
/* find values for DLL, DLM, DIVADDVAL, MULVAL */
up_configbaud(priv);
/* Disable access to latch divisor Clear DLAB */
up_serialout(priv, UART_LCR_OFFSET, lcr);
/* Configure the FIFOs */
up_serialout(priv, UART_FCR_OFFSET,
(FCR_FIFO_TRIG8 | FCR_TX_FIFO_RESET |
FCR_RX_FIFO_RESET | FCR_FIFO_ENABLE));
/* The NuttX serial driver waits for the first THRE interrrupt before sending
* serial data... However, it appears that the LPC2378 hardware too does not
* generate that interrupt until a transition from not-empty to empty. So,
* the current kludge here is to send one NULL at startup to kick things off.
*/
up_serialout(priv, UART_THR_OFFSET, '\0');
#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_attach
*
* Description:
* Configure the UART to operation in interrupt driven mode. This method is
* called when the serial port is opened. Normally, this is just after the
* the setup() method is called, however, the serial console may operate in
* a non-interrupt driven mode during the boot phase.
*
* RX and TX interrupts are not enabled when by the attach method (unless the
* hardware supports multiple levels of interrupt enabling). The RX and TX
* interrupts are not enabled until the txint() and rxint() methods are called.
*
****************************************************************************/
static int up_attach(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
int ret;
/* Attach and enable the IRQ */
ret = irq_attach(priv->irq, up_interrupt);
if (ret == OK)
{
/* Enable the interrupt (RX and TX interrupts are still disabled in the
* UART */
up_enable_irq(priv->irq);
/* Set the uart interrupt priority (the default value is one) */
if (priv->uartbase == UART0_BASE_ADDR)
{
up_prioritize_irq(priv->irq, PRIORITY_LOWEST);
}
else if (priv->uartbase == UART2_BASE_ADDR)
{
up_prioritize_irq(priv->irq, 10);
}
}
return ret;
}
/****************************************************************************
* Name: up_detach
*
* Description:
* Detach UART interrupts. This method is called when the serial port is
* closed normally just before the shutdown method is called. The exception is
* the serial console which is never shutdown.
*
****************************************************************************/
static void up_detach(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
up_disable_irq(priv->irq);
irq_detach(priv->irq);
}
/****************************************************************************
* 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;
uint8_t status;
int passes;
if (g_uart0priv.irq == irq)
{
dev = &g_uart0port;
}
else if (g_uart2priv.irq == irq)
{
dev = &g_uart2port;
}
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, UART_IIR_OFFSET);
/* The NO INTERRUPT should be zero if there are pending interrupts */
if ((status & IIR_NO_INT) != 0)
{
/* Break out of the loop when there is no longer a pending interrupt */
break;
}
/* Handle the interrupt by its interrupt ID field */
switch (status & IIR_MASK)
{
/* Handle incoming, receive bytes (with or without timeout) */
case IIR_RDA_INT:
case IIR_CTI_INT:
{
uart_recvchars(dev);
break;
}
/* Handle outgoing, transmit bytes */
case IIR_THRE_INT:
{
uart_xmitchars(dev);
break;
}
/* Just clear modem status interrupts (UART1 only) */
case IIR_MS_INT:
{
/* Read the modem status register (MSR) to clear */
status = up_serialin(priv, UART_MSR_OFFSET);
vdbg("MSR: %02x\n", status);
break;
}
/* Just clear any line status interrupts */
case IIR_RLS_INT:
{
/* Read the line status register (LSR) to clear */
status = up_serialin(priv, UART_LSR_OFFSET);
vdbg("LSR: %02x\n", status);
break;
}
/* There should be no other values */
default:
{
dbg("Unexpected IIR: %02x\n", status);
break;
}
}
}
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 return 'status'.
*
****************************************************************************/
static int up_receive(struct uart_dev_s *dev, uint32_t * status)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
uint8_t rbr;
*status = up_serialin(priv, UART_LSR_OFFSET);
rbr = up_serialin(priv, UART_RBR_OFFSET);
return rbr;
}
/****************************************************************************
* Name: up_rxint
*
* Description:
* Call to enable or disable RX interrupts
*
****************************************************************************/
static void up_rxint(struct uart_dev_s *dev, bool enable)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
if (enable)
{
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
priv->ier |= IER_ERBFI;
#endif
}
else
{
priv->ier &= ~IER_ERBFI;
}
up_serialout(priv, UART_IER_OFFSET, priv->ier);
}
/****************************************************************************
* Name: up_rxavailable
*
* Description:
* Return true if the receive fifo is not empty
*
****************************************************************************/
static bool up_rxavailable(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
return ((up_serialin(priv, UART_LSR_OFFSET) & 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, UART_THR_OFFSET, (uint8_t) ch);
}
/****************************************************************************
* Name: up_txint
*
* Description:
* Call to enable or disable TX interrupts
*
****************************************************************************/
static void up_txint(struct uart_dev_s *dev, bool enable)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
if (enable)
{
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
priv->ier |= IER_ETBEI;
#endif
}
else
{
priv->ier &= ~IER_ETBEI;
}
up_serialout(priv, UART_IER_OFFSET, priv->ier);
}
/****************************************************************************
* Name: up_txready
*
* Description:
* Return true if the tranmsit fifo is not full
*
****************************************************************************/
static bool up_txready(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
return ((up_serialin(priv, UART_LSR_OFFSET) & LSR_THRE) != 0);
}
/****************************************************************************
* Name: up_txempty
*
* Description:
* Return true if the transmit fifo is empty
*
****************************************************************************/
static bool up_txempty(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
return ((up_serialin(priv, UART_LSR_OFFSET) & 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 2 */
uint32_t pinsel = getreg32(LPC23XX_PINSEL0);
pinsel &= ~(UART0_PINMASK | UART2_PINMASK);
pinsel |= (UART0_PINSEL | UART2_PINSEL);
putreg32(pinsel, LPC23XX_PINSEL0);
/* Set Uart PCLK divider */
SCB_PCLKSEL0 = (SCB_PCLKSEL0 & ~U0_PCLKSEL_MASK) | U0_PCLKSEL;
SCB_PCLKSEL1 = (SCB_PCLKSEL1 & ~U2_PCLKSEL_MASK) | U2_PCLKSEL;
/* Disable both UARTS */
up_disableuartint(TTYS0_DEV.priv, NULL);
up_disableuartint(TTYS1_DEV.priv, NULL);
/* Configuration whichever one 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;
uint8_t ier;
up_disableuartint(priv, &ier);
up_waittxready(priv);
up_serialout(priv, UART_THR_OFFSET, (uint8_t) ch);
/* Check for LF */
if (ch == '\n')
{
/* Add CR */
up_waittxready(priv);
up_serialout(priv, UART_THR_OFFSET, '\r');
}
up_waittxready(priv);
up_restoreuartint(priv, ier);
return ch;
}
#else /* USE_SERIALDRIVER */
/****************************************************************************
* Name: up_putc
*
* Description:
* Provide priority, low-level access to support OS debug writes
*
****************************************************************************/
int up_putc(int ch)
{
/* Check for LF */
if (ch == '\n')
{
/* Add CR */
up_lowputc('\r');
}
up_lowputc(ch);
return ch;
}
#endif /* USE_SERIALDRIVER */
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