/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSBSPsARMLPC24XX_lcd
*
* @brief LCD support.
*/
/*
* Copyright (c) 2010-2012 embedded brains GmbH. 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.
*
* 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.
*/
#include <assert.h>
#include <bsp/lpc24xx.h>
#include <bsp/lcd.h>
#include <bsp/lpc-lcd.h>
#include <bsp/utility.h>
#include <bsp/system-clocks.h>
#ifdef ARM_MULTILIB_ARCH_V4
#define LCD_ENABLE BSP_BIT32(0)
#endif
rtems_status_code lpc24xx_lcd_set_mode(
lpc24xx_lcd_mode mode,
const lpc24xx_pin_range *pins
)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
bool enable = false;
switch (mode) {
case LCD_MODE_STN_4_BIT:
case LCD_MODE_STN_8_BIT:
case LCD_MODE_STN_DUAL_PANEL_4_BIT:
case LCD_MODE_STN_DUAL_PANEL_8_BIT:
case LCD_MODE_TFT_12_BIT_4_4_4:
case LCD_MODE_TFT_16_BIT_5_6_5:
case LCD_MODE_TFT_16_BIT_1_5_5_5:
case LCD_MODE_TFT_24_BIT:
enable = true;
break;
case LCD_MODE_DISABLED:
enable = false;
break;
default:
sc = RTEMS_IO_ERROR;
break;
}
if (sc == RTEMS_SUCCESSFUL) {
if (enable) {
sc = lpc24xx_module_enable(LPC24XX_MODULE_LCD, LPC24XX_MODULE_PCLK_DEFAULT);
assert(sc == RTEMS_SUCCESSFUL);
#ifdef ARM_MULTILIB_ARCH_V4
PINSEL11 = BSP_FLD32(mode, 1, 3) | LCD_ENABLE;
#endif
sc = lpc24xx_pin_config(pins, LPC24XX_PIN_SET_FUNCTION);
assert(sc == RTEMS_SUCCESSFUL);
} else {
if (lpc24xx_lcd_current_mode() != LCD_MODE_DISABLED) {
uint32_t lcd_ctrl = LCD_CTRL;
/* Disable power */
lcd_ctrl &= ~BSP_BIT32(11);
LCD_CTRL = lcd_ctrl;
lpc24xx_micro_seconds_delay(100000);
/* Disable all signals */
lcd_ctrl &= ~BSP_BIT32(0);
LCD_CTRL = lcd_ctrl;
}
sc = lpc24xx_pin_config(pins, LPC24XX_PIN_SET_INPUT);
assert(sc == RTEMS_SUCCESSFUL);
#ifdef ARM_MULTILIB_ARCH_V4
PINSEL11 = 0;
#endif
sc = lpc24xx_module_disable(LPC24XX_MODULE_LCD);
assert(sc == RTEMS_SUCCESSFUL);
}
}
return sc;
}
lpc24xx_lcd_mode lpc24xx_lcd_current_mode(void)
{
#ifdef ARM_MULTILIB_ARCH_V4
uint32_t pinsel11 = PINSEL11;
if ((PCONP & BSP_BIT32(20)) != 0 && (pinsel11 & LCD_ENABLE) != 0) {
return BSP_FLD32GET(pinsel11, 1, 3);
} else {
return LCD_MODE_DISABLED;
}
#else
volatile lpc17xx_scb *scb = &LPC17XX_SCB;
if ((scb->pconp & LPC17XX_SCB_PCONP_LCD) != 0) {
return LCD_CTRL & 0xae;
} else {
return LCD_MODE_DISABLED;
}
#endif
}
