lpc24xx/fb/lcd.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup RTEMSBSPsARMLPC24XX_lcd
0007  *
0008  * @brief LCD support.
0009  */
0010
0011 /*
0012  * Copyright (C) 2010, 2012 embedded brains GmbH & Co. KG
0013  *
0014  * Redistribution and use in source and binary forms, with or without
0015  * modification, are permitted provided that the following conditions
0016  * are met:
0017  * 1. Redistributions of source code must retain the above copyright
0018  *    notice, this list of conditions and the following disclaimer.
0019  * 2. Redistributions in binary form must reproduce the above copyright
0020  *    notice, this list of conditions and the following disclaimer in the
0021  *    documentation and/or other materials provided with the distribution.
0022  *
0023  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0024  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0025  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0026  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0027  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0028  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0029  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0030  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0031  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0032  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0033  * POSSIBILITY OF SUCH DAMAGE.
0034  */
0035
0036 #include <assert.h>
0037
0038 #include <bsp/lpc24xx.h>
0039 #include <bsp/lcd.h>
0040 #include <bsp/lpc-lcd.h>
0041 #include <bsp/utility.h>
0042 #include <bsp/system-clocks.h>
0043
0044 #ifdef ARM_MULTILIB_ARCH_V4
0045   #define LCD_ENABLE BSP_BIT32(0)
0046 #endif
0047
0048 rtems_status_code lpc24xx_lcd_set_mode(
0049   lpc24xx_lcd_mode mode,
0050   const lpc24xx_pin_range *pins
0051 )
0052 {
0053   rtems_status_code sc = RTEMS_SUCCESSFUL;
0054   bool enable = false;
0055
0056   switch (mode) {
0057     case LCD_MODE_STN_4_BIT:
0058     case LCD_MODE_STN_8_BIT:
0059     case LCD_MODE_STN_DUAL_PANEL_4_BIT:
0060     case LCD_MODE_STN_DUAL_PANEL_8_BIT:
0061     case LCD_MODE_TFT_12_BIT_4_4_4:
0062     case LCD_MODE_TFT_16_BIT_5_6_5:
0063     case LCD_MODE_TFT_16_BIT_1_5_5_5:
0064     case LCD_MODE_TFT_24_BIT:
0065       enable = true;
0066       break;
0067     case LCD_MODE_DISABLED:
0068       enable = false;
0069       break;
0070     default:
0071       sc = RTEMS_IO_ERROR;
0072       break;
0073   }
0074
0075   if (sc == RTEMS_SUCCESSFUL) {
0076     if (enable) {
0077       sc = lpc24xx_module_enable(LPC24XX_MODULE_LCD, LPC24XX_MODULE_PCLK_DEFAULT);
0078       assert(sc == RTEMS_SUCCESSFUL);
0079
0080       #ifdef ARM_MULTILIB_ARCH_V4
0081         PINSEL11 = BSP_FLD32(mode, 1, 3) | LCD_ENABLE;
0082       #endif
0083
0084       sc = lpc24xx_pin_config(pins, LPC24XX_PIN_SET_FUNCTION);
0085       assert(sc == RTEMS_SUCCESSFUL);
0086     } else {
0087       if (lpc24xx_lcd_current_mode() != LCD_MODE_DISABLED) {
0088         uint32_t lcd_ctrl = LCD_CTRL;
0089
0090         /* Disable power */
0091         lcd_ctrl &= ~BSP_BIT32(11);
0092         LCD_CTRL = lcd_ctrl;
0093
0094         lpc24xx_micro_seconds_delay(100000);
0095
0096         /* Disable all signals */
0097         lcd_ctrl &= ~BSP_BIT32(0);
0098         LCD_CTRL = lcd_ctrl;
0099       }
0100
0101       sc = lpc24xx_pin_config(pins, LPC24XX_PIN_SET_INPUT);
0102       assert(sc == RTEMS_SUCCESSFUL);
0103
0104       #ifdef ARM_MULTILIB_ARCH_V4
0105         PINSEL11 = 0;
0106       #endif
0107
0108       sc = lpc24xx_module_disable(LPC24XX_MODULE_LCD);
0109       assert(sc == RTEMS_SUCCESSFUL);
0110     }
0111   }
0112
0113   return sc;
0114 }
0115
0116 lpc24xx_lcd_mode lpc24xx_lcd_current_mode(void)
0117 {
0118   #ifdef ARM_MULTILIB_ARCH_V4
0119     uint32_t pinsel11 = PINSEL11;
0120
0121     if ((PCONP & BSP_BIT32(20)) != 0 && (pinsel11 & LCD_ENABLE) != 0) {
0122       return BSP_FLD32GET(pinsel11, 1, 3);
0123     } else {
0124       return LCD_MODE_DISABLED;
0125     }
0126   #else
0127     volatile lpc17xx_scb *scb = &LPC17XX_SCB;
0128
0129     if ((scb->pconp & LPC17XX_SCB_PCONP_LCD) != 0) {
0130       return LCD_CTRL & 0xae;
0131     } else {
0132       return LCD_MODE_DISABLED;
0133     }
0134   #endif
0135 }