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nuttx/arch/arm/src/lpc54xx/lpc54_lowputc.c

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/************************************************************************************
* arch/arm/src/lpc54xx/lpc54_lowputc.c
*
* Copyright (C) 2017 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Parts of this file were adapted from sample code provided for the LPC54xx
* family from NXP which has a compatible BSD license.
*
* Copyright (c) 2016, Freescale Semiconductor, Inc.
* Copyright (c) 2016 - 2017 , NXP
* All rights reserved.
*
* 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 <stdbool.h>
#include "up_arch.h"
#include "up_internal.h"
#include "chip/lpc54_memorymap.h"
#include "chip/lpc54_syscon.h"
#include "chip/lpc54_flexcomm.h"
#include "chip/lpc54_pinmux.h"
#include "chip/lpc54_usart.h"
#include "lpc54_config.h"
#include "lpc54_enableclk.h"
#include "lpc54_clockconfig.h"
#include "lpc54_gpio.h"
#include "lpc54_lowputc.h"
#include <arch/board/board.h>
/************************************************************************************
* Pre-processor Definitions
************************************************************************************/
#if defined(CONFIG_USART0_SERIAL_CONSOLE)
# define CONSOLE_BASE LPC54_FLEXCOMM0_BASE
# define CONSOLE_BAUD CONFIG_USART0_BAUD
# define CONSOLE_FCLK BOARD_FLEXCOMM0_FCLK
# define CONSOLE_PARITY CONFIG_USART0_PARITY
# define CONSOLE_BITS CONFIG_USART0_BITS
# ifdef CONFIG_USART0_2STOP
# define CONSOLE_STOPBITS2 true
# else
# define CONSOLE_STOPBITS2 false
# endif
# ifdef CONFIG_USART0_IFLOWCONTROL
# define CONSOLE_IFLOW true
# else
# define CONSOLE_IFLOW false
# endif
# ifdef CONFIG_USART0_OFLOWCONTROL
# define CONSOLE_OFLOW true
# else
# define CONSOLE_OFLOW false
# endif
#elif defined(CONFIG_USART1_SERIAL_CONSOLE)
# define CONSOLE_BASE LPC54_FLEXCOMM1_BASE
# define CONSOLE_BAUD CONFIG_USART1_BAUD
# define CONSOLE_FCLK BOARD_FLEXCOMM1_FCLK
# define CONSOLE_PARITY CONFIG_USART1_PARITY
# define CONSOLE_BITS CONFIG_USART1_BITS
# ifdef CONFIG_USART1_2STOP
# define CONSOLE_STOPBITS2 true
# else
# define CONSOLE_STOPBITS2 false
# endif
# ifdef CONFIG_USART1_IFLOWCONTROL
# define CONSOLE_IFLOW true
# else
# define CONSOLE_IFLOW false
# endif
# ifdef CONFIG_USART1_OFLOWCONTROL
# define CONSOLE_OFLOW true
# else
# define CONSOLE_OFLOW false
# endif
#elif defined(CONFIG_USART2_SERIAL_CONSOLE)
# define CONSOLE_BASE LPC54_FLEXCOMM2_BASE
# define CONSOLE_BAUD CONFIG_USART2_BAUD
# define CONSOLE_FCLK BOARD_FLEXCOMM2_FCLK
# define CONSOLE_PARITY CONFIG_USART2_PARITY
# define CONSOLE_BITS CONFIG_USART2_BITS
# ifdef CONFIG_USART2_2STOP
# define CONSOLE_STOPBITS2 true
# else
# define CONSOLE_STOPBITS2 false
# endif
# ifdef CONFIG_USART2_IFLOWCONTROL
# define CONSOLE_IFLOW true
# else
# define CONSOLE_IFLOW false
# endif
# ifdef CONFIG_USART2_OFLOWCONTROL
# define CONSOLE_OFLOW true
# else
# define CONSOLE_OFLOW false
# endif
#elif defined(CONFIG_USART3_SERIAL_CONSOLE)
# define CONSOLE_BASE LPC54_FLEXCOMM3_BASE
# define CONSOLE_BAUD CONFIG_USART3_BAUD
# define CONSOLE_FCLK BOARD_FLEXCOMM3_FCLK
# define CONSOLE_PARITY CONFIG_USART3_PARITY
# define CONSOLE_BITS CONFIG_USART3_BITS
# ifdef CONFIG_USART3_2STOP
# define CONSOLE_STOPBITS2 true
# else
# define CONSOLE_STOPBITS2 false
# endif
# ifdef CONFIG_USART3_IFLOWCONTROL
# define CONSOLE_IFLOW true
# else
# define CONSOLE_IFLOW false
# endif
# ifdef CONFIG_USART3_OFLOWCONTROL
# define CONSOLE_OFLOW true
# else
# define CONSOLE_OFLOW false
# endif
#elif defined(CONFIG_USART4_SERIAL_CONSOLE)
# define CONSOLE_BASE LPC54_FLEXCOMM4_BASE
# define CONSOLE_BAUD CONFIG_USART4_BAUD
# define CONSOLE_FCLK BOARD_FLEXCOMM4_FCLK
# define CONSOLE_PARITY CONFIG_USART4_PARITY
# define CONSOLE_BITS CONFIG_USART4_BITS
# ifdef CONFIG_USART4_2STOP
# define CONSOLE_STOPBITS2 true
# else
# define CONSOLE_STOPBITS2 false
# endif
# ifdef CONFIG_USART4_IFLOWCONTROL
# define CONSOLE_IFLOW true
# else
# define CONSOLE_IFLOW false
# endif
# ifdef CONFIG_USART4_OFLOWCONTROL
# define CONSOLE_OFLOW true
# else
# define CONSOLE_OFLOW false
# endif
#elif defined(CONFIG_USART5_SERIAL_CONSOLE)
# define CONSOLE_BASE LPC54_FLEXCOMM5_BASE
# define CONSOLE_BAUD CONFIG_USART5_BAUD
# define CONSOLE_FCLK BOARD_FLEXCOMM5_FCLK
# define CONSOLE_PARITY CONFIG_USART5_PARITY
# define CONSOLE_BITS CONFIG_USART5_BITS
# ifdef CONFIG_USART5_2STOP
# define CONSOLE_STOPBITS2 true
# else
# define CONSOLE_STOPBITS2 false
# endif
# ifdef CONFIG_USART5_IFLOWCONTROL
# define CONSOLE_IFLOW true
# else
# define CONSOLE_IFLOW false
# endif
# ifdef CONFIG_USART5_OFLOWCONTROL
# define CONSOLE_OFLOW true
# else
# define CONSOLE_OFLOW false
# endif
#elif defined(CONFIG_USART6_SERIAL_CONSOLE)
# define CONSOLE_BASE LPC54_FLEXCOMM6_BASE
# define CONSOLE_BAUD CONFIG_USART6_BAUD
# define CONSOLE_FCLK BOARD_FLEXCOMM6_FCLK
# define CONSOLE_PARITY CONFIG_USART6_PARITY
# define CONSOLE_BITS CONFIG_USART6_BITS
# ifdef CONFIG_USART6_2STOP
# define CONSOLE_STOPBITS2 true
# else
# define CONSOLE_STOPBITS2 false
# endif
# ifdef CONFIG_USART6_IFLOWCONTROL
# define CONSOLE_IFLOW true
# else
# define CONSOLE_IFLOW false
# endif
# ifdef CONFIG_USART6_OFLOWCONTROL
# define CONSOLE_OFLOW true
# else
# define CONSOLE_OFLOW false
# endif
#elif defined(CONFIG_USART7_SERIAL_CONSOLE)
# define CONSOLE_BASE LPC54_FLEXCOMM7_BASE
# define CONSOLE_BAUD CONFIG_USART7_BAUD
# define CONSOLE_FCLK BOARD_FLEXCOMM7_FCLK
# define CONSOLE_PARITY CONFIG_USART7_PARITY
# define CONSOLE_BITS CONFIG_USART7_BITS
# ifdef CONFIG_USART7_2STOP
# define CONSOLE_STOPBITS2 true
# else
# define CONSOLE_STOPBITS2 false
# endif
# ifdef CONFIG_USART7_IFLOWCONTROL
# define CONSOLE_IFLOW true
# else
# define CONSOLE_IFLOW false
# endif
# ifdef CONFIG_USART7_OFLOWCONTROL
# define CONSOLE_OFLOW true
# else
# define CONSOLE_OFLOW false
# endif
#elif defined(CONFIG_USART8_SERIAL_CONSOLE)
# define CONSOLE_BASE LPC54_FLEXCOMM8_BASE
# define CONSOLE_BAUD CONFIG_USART8_BAUD
# define CONSOLE_FCLK BOARD_FLEXCOMM8_FCLK
# define CONSOLE_PARITY CONFIG_USART8_PARITY
# define CONSOLE_BITS CONFIG_USART8_BITS
# ifdef CONFIG_USART8_2STOP
# define CONSOLE_STOPBITS2 true
# else
# define CONSOLE_STOPBITS2 false
# endif
# ifdef CONFIG_USART8_IFLOWCONTROL
# define CONSOLE_IFLOW true
# else
# define CONSOLE_IFLOW false
# endif
# ifdef CONFIG_USART8_OFLOWCONTROL
# define CONSOLE_OFLOW true
# else
# define CONSOLE_OFLOW false
# endif
#elif defined(CONFIG_USART9_SERIAL_CONSOLE)
# define CONSOLE_BASE LPC54_FLEXCOMM9_BASE
# define CONSOLE_BAUD CONFIG_USART9_BAUD
# define CONSOLE_FCLK BOARD_FLEXCOMM9_FCLK
# define CONSOLE_PARITY CONFIG_USART9_PARITY
# define CONSOLE_BITS CONFIG_USART9_BITS
# ifdef CONFIG_USART9_2STOP
# define CONSOLE_STOPBITS2 true
# else
# define CONSOLE_STOPBITS2 false
# endif
# ifdef CONFIG_USART9_IFLOWCONTROL
# define CONSOLE_IFLOW true
# else
# define CONSOLE_IFLOW false
# endif
# ifdef CONFIG_USART9_OFLOWCONTROL
# define CONSOLE_OFLOW true
# else
# define CONSOLE_OFLOW false
# endif
#endif
/************************************************************************************
* Private Data
************************************************************************************/
#ifdef HAVE_USART_CONSOLE
/* USART console configuration */
static const struct uart_config_s g_console_config=
{
.baud = CONSOLE_BAUD,
.fclk = CONSOLE_FCLK,
.parity = CONSOLE_PARITY,
.bits = CONSOLE_BITS,
.txlevel = LPC54_USART_FIFO_DEPTH / 2,
.rxlevel = 0,
.stopbits2 = CONSOLE_STOPBITS2,
#ifdef CONFIG_SERIAL_IFLOWCONTROL
.iflow = CONSOLE_IFLOW,
#endif
#ifdef CONFIG_SERIAL_OFLOWCONTROL
.oflow = CONSOLE_OFLOW,
#endif
};
#endif /* HAVE_USART_CONSOLE */
/************************************************************************************
* Private Functions
************************************************************************************/
/************************************************************************************
* Name: lp54_setbaud
*
* Description:
* Configure the USART BAUD.
*
************************************************************************************/
#ifdef HAVE_USART_DEVICE
static void lp54_setbaud(uintptr_t base, FAR const struct uart_config_s *config)
{
uint32_t bestdiff = (uint32_t)-1;
uint32_t bestosr = 15;
uint32_t bestbrg = (uint32_t)-1;
uint32_t lastosr = 0; /* Initialized only to avoid warnings */
uint32_t lastbrg = 0;
uint32_t osr;
uint32_t brg;
uint32_t diff;
uint32_t baud;
/* Smaller values of OSR can make the sampling position within a data bit less
* accurate and may potentially cause more noise errors or incorrect data.
*/
for (osr = bestosr; osr >= 8; osr--)
{
brg = (config->fclk / ((osr + 1) * config->baud)) - 1;
if (brg > 0xffff)
{
continue;
}
baud = config->fclk / ((osr + 1) * (brg + 1));
if (config->baud < baud)
{
diff = baud - config->baud;
}
else
{
diff = config->baud - baud;
}
if (diff < bestdiff)
{
bestdiff = diff;
bestosr = osr;
bestbrg = brg;
}
lastosr = osr;
lastbrg = brg;
}
/* Check for value over range */
if (bestbrg > 0xffff)
{
bestosr = lastosr;
bestbrg = lastbrg;
}
putreg32(bestosr, base + LPC54_USART_OSR_OFFSET);
putreg32(bestbrg, base + LPC54_USART_BRG_OFFSET);
}
#endif
/************************************************************************************
* Public Functions
************************************************************************************/
/************************************************************************************
* Name: lpc54_lowsetup
*
* Description:
* Called at the very beginning of _start. Performs low level initialization
* including setup of the console USART. This USART initialization is done
* early so that the serial console is available for debugging very early in
* the boot sequence.
*
************************************************************************************/
void lpc54_lowsetup(void)
{
/* Enable the IOCON and all GPIO modules */
putreg32(SYSCON_AHBCLKCTRL0_IOCON | SYSCON_AHBCLKCTRL0_GPIO0 |
SYSCON_AHBCLKCTRL0_GPIO1 | SYSCON_AHBCLKCTRL0_GPIO2 |
SYSCON_AHBCLKCTRL0_GPIO3, LPC54_SYSCON_AHBCLKCTRLSET0);
putreg32(SYSCON_AHBCLKCTRL2_GPIO4 | SYSCON_AHBCLKCTRL2_GPIO5,
LPC54_SYSCON_AHBCLKCTRLSET2);
/* TODO: Configure Fractional Rate Generator in case it is selected as a Flexcomm
* clock source.
*/
#ifdef HAVE_USART_DEVICE
#ifdef HAVE_USART0
/* Attach 12 MHz clock to FLEXCOMM0 */
lpc54_flexcomm0_enableclk();
/* Set FLEXCOMM0 to the USART peripheral, locking that configuration in place. */
putreg32(FLEXCOMM_PSELID_PERSEL_USART | FLEXCOMM_PSELID_LOCK,
LPC54_FLEXCOMM0_PSELID);
/* Configure USART0 pins (defined in board.h) */
lpc54_gpio_config(GPIO_USART0_RXD);
lpc54_gpio_config(GPIO_USART0_TXD);
#ifdef CONFIG_USART0_OFLOWCONTROL
lpc54_gpio_config(GPIO_USART0_CTS);
#endif
#ifdef CONFIG_USART0_IFLOWCONTROL
lpc54_gpio_config(GPIO_USART0_RTS);
#endif
/* Set up the FLEXCOMM0 function clock */
putreg32(BOARD_FLEXCOMM0_CLKSEL, LPC54_SYSCON_FCLKSEL0);
#endif
#ifdef HAVE_USART1
/* Attach 12 MHz clock to FLEXCOMM1 */
lpc54_flexcomm1_enableclk();
/* Set FLEXCOMM1 to the USART peripheral, locking that configuration in place. */
putreg32(FLEXCOMM_PSELID_PERSEL_USART | FLEXCOMM_PSELID_LOCK,
LPC54_FLEXCOMM1_PSELID);
/* Configure USART1 pins (defined in board.h) */
lpc54_gpio_config(GPIO_USART1_RXD);
lpc54_gpio_config(GPIO_USART1_TXD);
#ifdef CONFIG_USART1_OFLOWCONTROL
lpc54_gpio_config(GPIO_USART1_CTS);
#endif
#ifdef CONFIG_USART1_IFLOWCONTROL
lpc54_gpio_config(GPIO_USART1_RTS);
#endif
/* Set up the FLEXCOMM1 function clock */
putreg32(BOARD_FLEXCOMM1_CLKSEL, LPC54_SYSCON_FCLKSEL1);
#endif
#ifdef HAVE_USART2
/* Attach 12 MHz clock to FLEXCOMM2 */
lpc54_flexcomm2_enableclk();
/* Set FLEXCOMM2 to the USART peripheral, locking that configuration in place. */
putreg32(FLEXCOMM_PSELID_PERSEL_USART | FLEXCOMM_PSELID_LOCK,
LPC54_FLEXCOMM2_PSELID);
/* Configure USART2 pins (defined in board.h) */
lpc54_gpio_config(GPIO_USART2_RXD);
lpc54_gpio_config(GPIO_USART2_TXD);
#ifdef CONFIG_USART2_OFLOWCONTROL
lpc54_gpio_config(GPIO_USART2_CTS);
#endif
#ifdef CONFIG_USART2_IFLOWCONTROL
lpc54_gpio_config(GPIO_USART2_RTS);
#endif
/* Set up the FLEXCOMM0 function clock */
putreg32(BOARD_FLEXCOMM2_CLKSEL, LPC54_SYSCON_FCLKSEL2);
#endif
#ifdef HAVE_USART3
/* Attach 12 MHz clock to FLEXCOMM3 */
lpc54_flexcomm3_enableclk();
/* Set FLEXCOMM3 to the USART peripheral, locking that configuration in place. */
putreg32(FLEXCOMM_PSELID_PERSEL_USART | FLEXCOMM_PSELID_LOCK,
LPC54_FLEXCOMM3_PSELID);
/* Configure USART3 pins (defined in board.h) */
lpc54_gpio_config(GPIO_USART3_RXD);
lpc54_gpio_config(GPIO_USART3_TXD);
#ifdef CONFIG_USART3_OFLOWCONTROL
lpc54_gpio_config(GPIO_USART3_CTS);
#endif
#ifdef CONFIG_USART3_IFLOWCONTROL
lpc54_gpio_config(GPIO_USART3_RTS);
#endif
/* Set up the FLEXCOMM3 function clock */
putreg32(BOARD_FLEXCOMM3_CLKSEL, LPC54_SYSCON_FCLKSEL3);
#endif
#ifdef HAVE_USART4
/* Attach 12 MHz clock to FLEXCOMM4 */
lpc54_flexcomm4_enableclk();
/* Set FLEXCOMM4 to the USART peripheral, locking that configuration in place. */
putreg32(FLEXCOMM_PSELID_PERSEL_USART | FLEXCOMM_PSELID_LOCK,
LPC54_FLEXCOMM4_PSELID);
/* Configure USART4 pins (defined in board.h) */
lpc54_gpio_config(GPIO_USART4_RXD);
lpc54_gpio_config(GPIO_USART4_TXD);
#ifdef CONFIG_USART4_OFLOWCONTROL
lpc54_gpio_config(GPIO_USART4_CTS);
#endif
#ifdef CONFIG_USART4_IFLOWCONTROL
lpc54_gpio_config(GPIO_USART4_RTS);
#endif
/* Set up the FLEXCOMM4 function clock */
putreg32(BOARD_FLEXCOMM4_CLKSEL, LPC54_SYSCON_FCLKSEL4);
#endif
#ifdef HAVE_USART5
/* Attach 12 MHz clock to FLEXCOMM5 */
lpc54_flexcomm5_enableclk();
/* Set FLEXCOMM5 to the USART peripheral, locking that configuration in place. */
putreg32(FLEXCOMM_PSELID_PERSEL_USART | FLEXCOMM_PSELID_LOCK,
LPC54_FLEXCOMM5_PSELID);
/* Configure USART5 pins (defined in board.h) */
lpc54_gpio_config(GPIO_USART5_RXD);
lpc54_gpio_config(GPIO_USART5_TXD);
#ifdef CONFIG_USART5_OFLOWCONTROL
lpc54_gpio_config(GPIO_USART5_CTS);
#endif
#ifdef CONFIG_USART5_IFLOWCONTROL
lpc54_gpio_config(GPIO_USART5_RTS);
#endif
/* Set up the FLEXCOMM5 function clock */
putreg32(BOARD_FLEXCOMM5_CLKSEL, LPC54_SYSCON_FCLKSEL5);
#endif
#ifdef HAVE_USART6
/* Attach 12 MHz clock to FLEXCOMM6 */
lpc54_flexcomm6_enableclk();
/* Set FLEXCOMM6 to the USART peripheral, locking that configuration in place. */
putreg32(FLEXCOMM_PSELID_PERSEL_USART | FLEXCOMM_PSELID_LOCK,
LPC54_FLEXCOMM6_PSELID);
/* Configure USART6 pins (defined in board.h) */
lpc54_gpio_config(GPIO_USART6_RXD);
lpc54_gpio_config(GPIO_USART6_TXD);
#ifdef CONFIG_USART6_OFLOWCONTROL
lpc54_gpio_config(GPIO_USART6_CTS);
#endif
#ifdef CONFIG_USART6_IFLOWCONTROL
lpc54_gpio_config(GPIO_USART6_RTS);
#endif
/* Set up the FLEXCOMM6 function clock */
putreg32(BOARD_FLEXCOMM6_CLKSEL, LPC54_SYSCON_FCLKSEL6);
#endif
#ifdef HAVE_USART7
/* Attach 12 MHz clock to FLEXCOMM7 */
lpc54_flexcomm7_enableclk();
/* Set FLEXCOMM7 to the USART peripheral, locking that configuration in place. */
putreg32(FLEXCOMM_PSELID_PERSEL_USART | FLEXCOMM_PSELID_LOCK,
LPC54_FLEXCOMM7_PSELID);
/* Configure USART7 pins (defined in board.h) */
lpc54_gpio_config(GPIO_USART7_RXD);
lpc54_gpio_config(GPIO_USART7_TXD);
#ifdef CONFIG_USART7_OFLOWCONTROL
lpc54_gpio_config(GPIO_USART7_CTS);
#endif
#ifdef CONFIG_USART7_IFLOWCONTROL
lpc54_gpio_config(GPIO_USART7_RTS);
#endif
/* Set up the FLEXCOMM7 function clock */
putreg32(BOARD_FLEXCOMM7_CLKSEL, LPC54_SYSCON_FCLKSEL7);
#endif
#ifdef HAVE_USART8
/* Attach 12 MHz clock to FLEXCOMM8 */
lpc54_flexcomm8_enableclk();
/* Set FLEXCOMM8 to the USART peripheral, locking that configuration in place. */
putreg32(FLEXCOMM_PSELID_PERSEL_USART | FLEXCOMM_PSELID_LOCK,
LPC54_FLEXCOMM8_PSELID);
/* Configure USART8 pins (defined in board.h) */
lpc54_gpio_config(GPIO_USART8_RXD);
lpc54_gpio_config(GPIO_USART8_TXD);
#ifdef CONFIG_USART8_OFLOWCONTROL
lpc54_gpio_config(GPIO_USART8_CTS);
#endif
#ifdef CONFIG_USART8_IFLOWCONTROL
lpc54_gpio_config(GPIO_USART8_RTS);
#endif
/* Set up the FLEXCOMM0 function clock */
putreg32(BOARD_FLEXCOMM8_CLKSEL, LPC54_SYSCON_FCLKSEL8);
#endif
#ifdef HAVE_USART9
/* Attach 12 MHz clock to FLEXCOMM9 */
lpc54_flexcomm9_enableclk();
/* Set FLEXCOMM9 to the USART peripheral, locking that configuration in place. */
putreg32(FLEXCOMM_PSELID_PERSEL_USART | FLEXCOMM_PSELID_LOCK,
LPC54_FLEXCOMM9_PSELID);
/* Configure USART9 pins (defined in board.h) */
lpc54_gpio_config(GPIO_USART9_RXD);
lpc54_gpio_config(GPIO_USART9_TXD);
#ifdef CONFIG_USART9_OFLOWCONTROL
lpc54_gpio_config(GPIO_USART9_CTS);
#endif
#ifdef CONFIG_USART9_IFLOWCONTROL
lpc54_gpio_config(GPIO_USART9_RTS);
#endif
/* Set up the FLEXCOMM9 function clock */
putreg32(BOARD_FLEXCOMM9_CLKSEL, LPC54_SYSCON_FCLKSEL9);
#endif
#ifdef HAVE_USART_CONSOLE
/* Configure the console USART (if any) */
lpc54_usart_configure(CONSOLE_BASE, &g_console_config);
#endif /* HAVE_USART_CONSOLE */
#endif /* HAVE_USART_DEVICE */
}
/************************************************************************************
* Name: lpc54_usart_configure
*
* Description:
* Configure a UART for non-interrupt driven operation
*
************************************************************************************/
#ifdef HAVE_USART_DEVICE
void lpc54_usart_configure(uintptr_t base, FAR const struct uart_config_s *config)
{
uint32_t regval;
/* Configure baud */
lp54_setbaud(base, config);
/* Configure RX and TX FIFOs */
/* Empty and enable FIFOs */
regval = getreg32(base + LPC54_USART_FIFOCFG_OFFSET);
regval |= (USART_FIFOCFG_ENABLERX | USART_FIFOCFG_EMPTYRX);
regval |= (USART_FIFOCFG_ENABLETX | USART_FIFOCFG_EMPTYTX);
putreg32(regval, base + LPC54_USART_FIFOCFG_OFFSET);
/* Setup trigger level */
regval = getreg32(base + LPC54_USART_FIFOTRIG_OFFSET);
regval &= ~(USART_FIFOTRIG_TXLVL_MASK | USART_FIFOTRIG_RXLVL_MASK);
regval |= USART_FIFOTRIG_RXLVL(config->rxlevel);
regval |= USART_FIFOTRIG_TXLVL(config->txlevel);
putreg32(regval, base + LPC54_USART_FIFOTRIG_OFFSET);
/* Enable trigger events */
regval |= (USART_FIFOTRIG_RXLVLENA | USART_FIFOTRIG_TXLVLENA);
putreg32(regval, base + LPC54_USART_FIFOTRIG_OFFSET);
/* Setup configuration and enable USART */
regval = USART_CFG_ENABLE;
switch (config->bits)
{
case 7:
regval |= USART_CFG_DATALEN_7BIT;
break;
default:
case 8:
regval |= USART_CFG_DATALEN_8BIT;
break;
case 9:
regval |= USART_CFG_DATALEN_9BIT;
break;
}
switch (config->parity)
{
default:
case 0:
regval |= USART_CFG_PARITYSEL_NONE;
break;
case 1:
regval |= USART_CFG_PARITYSEL_ODD;
break;
case 2:
regval |= USART_CFG_PARITYSEL_EVEN;
break;
}
if (config->stopbits2)
{
regval |= USART_CFG_STOPLEN;
}
putreg32(regval, base + LPC54_USART_CFG_OFFSET);
}
#endif
/****************************************************************************
* Name: lpc54_usart_disable
*
* Description:
* Disable a USART. it will be necessary to again call
* lpc54_usart_configure() in order to use this USART channel again.
*
****************************************************************************/
#ifdef HAVE_USART_DEVICE
void lpc54_usart_disable(uintptr_t base)
{
/* Disable interrupts */
putreg32(USART_FIFOINT_ALL, base + LPC54_USART_FIFOINTENCLR_OFFSET);
/* Disable the UART */
putreg32(0, base + LPC54_USART_CFG_OFFSET);
/* Disable the FIFOs */
putreg32(0, base + LPC54_USART_FIFOCFG_OFFSET);
putreg32(0, base + LPC54_USART_FIFOTRIG_OFFSET);
}
#endif
/****************************************************************************
* Name: up_lowputc
*
* Description:
* Output one byte on the serial console
*
****************************************************************************/
void up_lowputc(char ch)
{
#ifdef HAVE_USART_CONSOLE
irqstate_t flags;
for (; ; )
{
/* Wait for the transmit FIFO to be not full */
while ((getreg32(CONSOLE_BASE + LPC54_USART_FIFOSTAT_OFFSET) &
USART_FIFOSTAT_TXNOTFULL) == 0)
{
}
/* Disable interrupts so that the fest test and the transmission are
* atomic.
*/
flags = enter_critical_section();
if ((getreg32(CONSOLE_BASE + LPC54_USART_FIFOSTAT_OFFSET) &
USART_FIFOSTAT_TXNOTFULL) != 0)
{
/* Send the character */
putreg32((uint32_t)ch, CONSOLE_BASE + LPC54_USART_FIFOWR_OFFSET);
leave_critical_section(flags);
return;
}
leave_critical_section(flags);
}
#endif
}
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