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nuttx/boards/renesas/m16c/skp16c26/src/m16c_lcd.c
zhangyuan21 a8fa51e6bf arch: rename arch special function name
2022-11-22 16:27:56 +08:00

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/****************************************************************************
* boards/renesas/m16c/skp16c26/src/m16c_lcd.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <stdbool.h>
#include <ctype.h>
#include "renesas_internal.h"
#include "chip.h"
#ifdef CONFIG_SLCD
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* LCD dimensions ***********************************************************/
#define LCD_NLINES 2 /* Two lines */
#define LCD_NCHARS 8 /* Eight characters per line */
/* LCD commands *************************************************************/
#define LCD_CLEAR 0x01 /* Clear LCD display and home cursor */
#define CURSOR_MODE_DEC 0x04 /* Cursor auto decrement after R/W */
#define CURSOR_MODE_INC 0x06 /* Cursor auto increment after R/W */
#define LCD_CURSOR_ON 0x0e /* Display ON with Cursor */
#define LCD_CURSOR_OFF 0x0c /* Display ON with Cursor off */
#define LCD_CURSOR_BLINK 0x0d /* Display on with blinking cursor */
#define LCD_CURSOR_LEFT 0x10 /* Move Cursor Left One Position */
#define LCD_CURSOR_RIGHT 0x14 /* Move Cursor Right One Position */
#define FUNCTION_SET 0x28 /* Setup, 4 bits,2 lines, 5X7 */
#define LCD_CGRAM 0x40 /* Map characters to CG RAM */
#define LCD_POS_L1(p) (0x80 | p) /* Move cursor to line 1, character p+1 */
#define LCD_POS_L2(p) (0xc0 | p) /* Move cursor to line 2, character p+1 */
#define LCD_HOME_L1 0x80 /* Move cursor to line 1 */
#define LCD_HOME_L2 0xc0 /* Move cursor to line 2 */
/****************************************************************************
* Private Data
****************************************************************************/
static uint8_t g_nchars; /* Number of characters in lines 2 */
static uint8_t g_line[LCD_NCHARS]; /* The content of lines 2 */
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: up_lcddelay
****************************************************************************/
static void up_lcddelay(uint16_t count)
{
uint32_t counter = (uint16_t)count << 8;
while (counter--)
{
asm("\tnop\n\tnop\n\tnop\n" : :); /* 3 NOPs */
}
}
/****************************************************************************
* Name: up_setrs
****************************************************************************/
static inline void up_setrs(bool data)
{
/* Set/clear bit 1 of port 6 */
register uint8_t regval = getreg8(M16C_P6);
if (data)
{
regval |= (1 << 0); /* High = data */
}
else
{
regval &= ~(1 << 0); /* Low = control */
}
putreg8(regval, M16C_P6);
}
/****************************************************************************
* Name: up_seten
****************************************************************************/
static inline void up_seten(void)
{
/* Set bit 1 of port 6 */
register uint8_t regval = getreg8(M16C_P6);
regval |= (1 << 1);
putreg8(regval, M16C_P6);
}
/****************************************************************************
* Name: up_clren
****************************************************************************/
static inline void up_clren(void)
{
/* Clear bit 1 of port 6 */
register uint8_t regval = getreg8(M16C_P6);
regval &= ~(1 << 1);
putreg8(regval, M16C_P6);
}
/****************************************************************************
* Name: up_enpluse
****************************************************************************/
static inline void up_enpulse(bool data)
{
up_seten(); /* EN enable chip (HIGH) */
up_lcddelay(0); /* Short delay */
up_clren(); /* Latch data by setting EN low */
up_lcddelay(0); /* Short delay for data writes */
if (!data) up_lcddelay(0); /* Longer delay for control writes */
}
/****************************************************************************
* Name: up_lcdwrite
****************************************************************************/
void up_lcdwrite(bool data, uint8_t ch)
{
up_setrs(data); /* Set RS appropriately */
/* Write upper nibble first. Only the lower 4 bits of P9 are valid.
* The upper four bits are reserved and must be zero.
*/
putreg8(ch >> 4, M16C_P9);
up_enpulse(data);
/* Write lower nibble second */
putreg8(ch & 0x0f, M16C_P9);
up_enpulse(data);
}
/****************************************************************************
* Name: up_scroll
****************************************************************************/
static void up_scroll(void)
{
int i;
/* Clear the display and position the cursor at the beginning of line 1 */
up_lcdwrite(false, LCD_CLEAR);
up_lcdwrite(false, LCD_HOME_L1);
/* Copy line 2 to line 1 */
for (i = 0; i < g_nchars; i++)
{
up_lcdwrite(true, g_line[i]);
}
/* Position the cursor at the beginning of line 2 */
up_lcdwrite(false, LCD_HOME_L2);
g_nchars = 0;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_lcdinit
****************************************************************************/
void up_lcdinit(void)
{
uint8_t regval;
/* Enable writing to PD9 by selecting bit 2 in the protection register */
regval = getreg8(M16C_PRCR);
regval |= (1 << 2);
putreg8(regval, M16C_PRCR);
/* We can't read PD9, so we can't OR the values in */
putreg8(0x0f, M16C_PD9);
/* Set EN (port 6 bit 1) and Set RS (port 6 bit 0) as outputs */
regval = getreg8(M16C_P6);
regval |= (1 << 1) | (1 << 0);
putreg8(regval, M16C_P6);
regval = getreg8(M16C_PD6);
regval |= (1 << 1) | (1 << 0);
putreg8(regval, M16C_PD6);
/* Set EN low */
up_clren();
/* Write the reset sequence */
up_lcdwrite(false, 0x33);
up_lcddelay(20);
up_lcdwrite(false, 0x32);
up_lcddelay(20);
up_lcdwrite(false, FUNCTION_SET); /* reset sequence */
up_lcdwrite(false, FUNCTION_SET);
up_lcdwrite(false, LCD_CURSOR_OFF);
up_lcdwrite(false, LCD_CLEAR);
up_lcdwrite(false, LCD_HOME_L1);
}
/****************************************************************************
* Name: up_lcdputc
****************************************************************************/
void up_lcdputc(char ch)
{
/* Check for new line */
if (ch == '\n')
{
up_scroll();
}
/* Should we wrap to truncate at the end of line??? Let's truncate.
* In either case, let's ignore all other non-printable characters.
*/
else if (g_nchars < LCD_NCHARS && isprint(ch))
{
up_lcdwrite(true, ch);
g_line[g_nchars] = ch;
g_nchars++;
}
}
#endif /* CONFIG_SLCD */
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