leandrof/u-boot
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

led_display: split led display support into generic and hw-dependent parts

Browse Source 
Split the display command into generic interface and hardware-specific
realization for PDSP188x LED display found on hmi1001 and manroland
boards. Simple interface for LED displays is defined in
include/led-display.h and described in doc/README.LED_display.
Driver-specific implementation was moved into drivers/misc/pdsp188x.c
file (enabled with CONFIG_PDSP188x set).

Signed-off-by: Ilya Yanok <yanok@emcraft.com>
This commit is contained in:
Ilya Yanok 2010-09-09 23:03:32 +02:00 committed by Wolfgang Denk
parent 9531a2388c
commit 7f0d241d5c
7 changed files with 136 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
common/cmd_display.c
View File

@ -23,40 +23,32 @@
#include <common.h>
#include <command.h>
#include <led-display.h>
#undef DEBUG_DISP
#define DISP_SIZE 8
#define CWORD_CLEAR 0x80
#define CLEAR_DELAY (110 * 2)
int do_display (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
int i;
int pos;
/* Clear display */
*((volatile char*)(CONFIG_SYS_DISP_CWORD)) = CWORD_CLEAR;
udelay(1000 * CLEAR_DELAY);
display_set(DISPLAY_CLEAR | DISPLAY_HOME);
if (argc < 2)
return (0);
for (pos = 0, i = 1; i < argc && pos < DISP_SIZE; i++) {
char *p = argv[i], c;
for (i = 1; i < argc; i++) {
char *p = argv[i];
if (i > 1) {
*((volatile uchar *) (CONFIG_SYS_DISP_CHR_RAM + pos++)) = ' ';
#ifdef DEBUG_DISP
putc(' ');
#endif
if (i > 1) { /* Insert a space between strings */
display_putc(' ');
}
while ((c = *p++) != '\0' && pos < DISP_SIZE) {
*((volatile uchar *) (CONFIG_SYS_DISP_CHR_RAM + pos++)) = c;
while ((*p)) {
#ifdef DEBUG_DISP
putc(c);
putc(*p);
#endif
display_putc(*p++);
}
}

27
doc/README.LED_display Normal file
View File

@ -0,0 +1,27 @@
LED display internal API
=======================================
This README describes the LED display API.
The API is defined by the include file include/led-display.h
The first step in to define CONFIG_CMD_DISPLAY in the board config file.
Then you need to provide the following functions to access LED display:
void display_set(int cmd);
This function should control the state of the LED display. Argument is
an ORed combination of the following values:
DISPLAY_CLEAR -- clear the display
DISPLAY_HOME -- set the position to the beginning of display
DISPLAY_MARK -- enable mark (decimal point), if implemented
int display_putc(char c);
This function should display it's parameter on the LED display in the
current position. Returns the displayed character on success or -1 in
case of failure.
With this functions defined 'display' command will display it's
arguments on the LED display (or clear the display if called without
arguments).

1
drivers/misc/Makefile
View File

@ -33,6 +33,7 @@ COBJS-$(CONFIG_NS87308) += ns87308.o
COBJS-$(CONFIG_STATUS_LED) += status_led.o
COBJS-$(CONFIG_TWL4030_LED) += twl4030_led.o
COBJS-$(CONFIG_FSL_PMIC) += fsl_pmic.o
COBJS-$(CONFIG_PDSP188x) += pdsp188x.o
COBJS := $(COBJS-y)
SRCS := $(COBJS:.o=.c)

57
drivers/misc/pdsp188x.c Normal file
View File

@ -0,0 +1,57 @@
/*
* Copyright 2010 Sergey Poselenov, Emcraft Systems, <sposelenov@emcraft.com>
* Copyright 2010 Ilya Yanok, Emcraft Systems, <yanok@emcraft.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#include <common.h>
#include <led-display.h>
#include <asm/io.h>
#ifdef CONFIG_CMD_DISPLAY
#define CWORD_CLEAR 0x80
#define CLEAR_DELAY (110 * 2)
#define DISPLAY_SIZE 8
static int pos; /* Current display position */
/* Handle different display commands */
void display_set(int cmd)
{
if (cmd & DISPLAY_CLEAR) {
out_8((unsigned char *)CONFIG_SYS_DISP_CWORD, CWORD_CLEAR);
udelay(1000 * CLEAR_DELAY);
}
if (cmd & DISPLAY_HOME) {
pos = 0;
}
}
/*
* Display a character at the current display position.
* Characters beyond the display size are ignored.
*/
int display_putc(char c)
{
if (pos >= DISPLAY_SIZE)
return -1;
out_8((unsigned char *)CONFIG_SYS_DISP_CHR_RAM + pos++, c);
return c;
}
#endif

1
include/configs/hmi1001.h
View File

@ -352,6 +352,7 @@
/* Display addresses */
/*---------------------------------------------------------------------*/
#define CONFIG_PDSP188x
#define CONFIG_SYS_DISP_CHR_RAM (CONFIG_SYS_DISPLAY_BASE + 0x38)
#define CONFIG_SYS_DISP_CWORD (CONFIG_SYS_DISPLAY_BASE + 0x30)

5
include/configs/manroland/common.h
View File

@ -55,6 +55,11 @@
#define CONFIG_CMD_MII
#define CONFIG_CMD_SNTP
/*
* 8-symbol LED display (can be accessed with 'display' command)
*/
#define CONFIG_PDSP188x
#define CONFIG_TIMESTAMP 1 /* Print image info with timestamp */
/*

36
include/led-display.h Normal file
View File

@ -0,0 +1,36 @@
/*
* (C) Copyright 2005-2010
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* (C) Copyright 2010
* Sergei Poselenov, Emcraft Systems, sposelenov@emcraft.com.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#ifndef _led_display_h_
#define _led_display_h_
/* Display Commands */
#define DISPLAY_CLEAR 0x1 /* Clear the display */
#define DISPLAY_HOME 0x2 /* Set cursor at home position */
#define DISPLAY_MARK 0x4 /* Enable the decimal point led, if implemented */
void display_set(int cmd);
int display_putc(char c);
#endif