/****************************************************************************
* config/olimex-lpc1766stk/src/up_lcd.c
* arch/arm/src/board/up_lcd.c
*
* Copyright (C) 2010 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
* POSSPBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdio.h>
#include <debug.h>
#include <errno.h>
#include <nuttx/arch.h>
#include <nuttx/spi.h>
#include <nuttx/lcd/lcd.h>
#include <nuttx/lcd/nokia6100.h>
#include "up_arch.h"
#include "chip/lpc17_syscon.h"
#include "chip/lpc17_pwm.h"
#include "lpc17_gpio.h"
#include "lpc1766stk_internal.h"
#if defined(CONFIG_NX_LCDDRIVER) && defined(CONFIG_LCD_NOKIA6100) && defined(CONFIG_LPC17_SSP0)
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/* Check power setting */
#if !defined(CONFIG_LCD_MAXPOWER) || CONFIG_LCD_MAXPOWER != 127
# error "CONFIG_LCD_MAXPOWER must be 127"
#endif
/* Backlight OFF PWM setting */
#define NOKIA_BACKLIGHT_OFF 0x40
/* Define the CONFIG_LCD_NOKIADBG to enable detailed debug output (stuff you
* would never want to see unless you are debugging this file).
*
* Verbose debug must also be enabled
*/
#ifndef CONFIG_DEBUG
# undef CONFIG_DEBUG_VERBOSE
# undef CONFIG_DEBUG_GRAPHICS
#endif
#ifndef CONFIG_DEBUG_VERBOSE
# undef CONFIG_LCD_NOKIADBG
#endif
#ifdef CONFIG_LCD_NOKIADBG
# define lcddbg(format, arg...) vdbg(format, ##arg)
# define lcd_dumpgpio(m) lpc17_dumpgpio(LPC1766STK_LCD_RST, m)
#else
# define lcddbg(x...)
# define lcd_dumpgpio(m)
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nokia_blinitialize
*
* Description:
* Initialize PWM1 to manage the LCD backlight.
*
****************************************************************************/
void nokia_blinitialize(void)
{
uint32_t regval;
/* Enable clocking of PWM1 */
regval = getreg32(LPC17_SYSCON_PCONP);
regval |= SYSCON_PCONP_PCPWM1;
putreg32(regval, LPC17_SYSCON_PCONP);
/* Disable and reset PWM1 */
regval = getreg32(LPC17_PWM1_TCR);
regval &= ~(PWM_TCR_PWMEN|PWM_TCR_CNTREN);
regval |= PWM_TCR_CNTRRST;
putreg32(regval, LPC17_PWM1_TCR);
/* Put PWM1 in timer mode */
regval = getreg32(LPC17_PWM1_CTCR);
regval &= ~PWM_CTCR_MODE_MASK;
regval |= PWM_CTCR_MODE_TIMER;
putreg32(regval, LPC17_PWM1_CTCR);
/* Reset on MR0 */
putreg32(PWM_MCR_MR0R, LPC17_PWM1_MCR);
/* Single edge controlled mod for PWM3 and enable output */
regval = getreg32(LPC17_PWM1_PCR);
regval &= ~PWM_PCR_SEL3;
regval |= PWM_PCR_ENA3;
putreg32(regval, LPC17_PWM1_PCR);
/* Clear prescaler */
putreg32(0, LPC17_PWM1_PR);
/* Set 8-bit resolution */
putreg32(0xff, LPC17_PWM1_MCR);
/* Enable PWM match 1 latch */
regval = getreg32(LPC17_PWM1_LER);
regval |= PWM_LER_M0EN;
putreg32(regval, LPC17_PWM1_LER);
/* Clear match register 3 */
putreg32(0, LPC17_PWM1_MR3);
/* Enable PWM1 */
regval |= PWM_LER_M3EN;
putreg32(regval, LPC17_PWM1_LER);
regval = getreg32(LPC17_PWM1_TCR);
regval &= ~(PWM_TCR_CNTRRST);
regval |= (PWM_TCR_PWMEN|PWM_TCR_CNTREN);
putreg32(regval, LPC17_PWM1_TCR);
nokia_backlight(0);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_nxdrvinit
*
* Description:
* Called NX initialization logic to configure the LCD.
*
****************************************************************************/
FAR struct lcd_dev_s *up_nxdrvinit(unsigned int devno)
{
FAR struct spi_dev_s *spi;
FAR struct lcd_dev_s *dev;
/* Configure the LCD GPIOs */
lcd_dumpgpio("up_nxdrvinit: On entry");
lpc17_configgpio(LPC1766STK_LCD_RST);
lpc17_configgpio(LPC1766STK_LCD_BL);
lcd_dumpgpio("up_nxdrvinit: After GPIO setup");
/* Reset the LCD */
lpc17_gpiowrite(LPC1766STK_LCD_RST, false);
up_udelay(10);
lpc17_gpiowrite(LPC1766STK_LCD_RST, true);
up_mdelay(5);
/* Configure PWM1 to support the backlight */
nokia_blinitialize();
/* Get the SSP port (configure as a Freescale SPI port) */
spi = up_spiinitialize(0);
if (!spi)
{
glldbg("Failed to initialize SSP port 0\n");
}
else
{
/* Bind the SSP port to the LCD */
dev = nokia_lcdinitialize(spi, devno);
if (!dev)
{
glldbg("Failed to bind SSP port 0 to LCD %d: %d\n", devno);
}
else
{
gllvdbg("Bound SSP port 0 to LCD %d\n", devno);
/* And turn the LCD on (CONFIG_LCD_MAXPOWER should be 1) */
(void)dev->setpower(dev, CONFIG_LCD_MAXPOWER);
return dev;
}
}
return NULL;
}
/****************************************************************************
* Name: nokia_backlight
*
* Description:
* The Nokia 6100 backlight is controlled by logic outside of the LCD
* assembly. This function must be provided by board specific logic to
* manage the backlight. This function will receive a power value (0:
* full off - CONFIG_LCD_MAXPOWER: full on) and should set the backlight
* accordingly.
*
* On the Olimex LPC1766STK, the backlight level is controlled by PWM1.
*
****************************************************************************/
int nokia_backlight(unsigned int power)
{
uint32_t regval;
putreg32(NOKIA_BACKLIGHT_OFF + power, LPC17_PWM1_MR3);
regval = getreg32(LPC17_PWM1_LER);
regval |= PWM_LER_M3EN;
putreg32(regval, LPC17_PWM1_LER);
return OK;
}
#endif /* CONFIG_NX_LCDDRIVER && CONFIG_LCD_NOKIA6100 && CONFIG_LPC17_SSP0 */
