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219 lines
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219 lines
8.8 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>leds.c (Embed with GNU)</title>
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<meta name="description" content="leds.c (Embed with GNU)">
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<link href="#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Code-Listings.html#Code-Listings" rel="up" title="Code Listings">
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</head>
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<body lang="en">
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<a name="leds_002ec"></a>
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<div class="header">
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<p>
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Previous: <a href="io_002ec.html#io_002ec" accesskey="p" rel="prev">io.c</a>, Up: <a href="Code-Listings.html#Code-Listings" accesskey="u" rel="up">Code Listings</a> [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>]</p>
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</div>
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<hr>
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<a name="Led-control-sample"></a>
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<h3 class="section">A.6 Led control sample</h3>
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<div class="example">
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<pre class="example">/*
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* leds.h -- control the led's on a Motorola mc68ec0x0 board.
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*/
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#ifndef __LEDS_H__
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#define __LEDS_H__
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#define LED_ADDR 0xd00003
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#define LED_0 ~0x1
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#define LED_1 ~0x2
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#define LED_2 ~0x4
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#define LED_3 ~0x8
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#define LED_4 ~0x10
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#define LED_5 ~0x20
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#define LED_6 ~0x40
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#define LED_7 ~0x80
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#define LEDS_OFF 0xff
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#define LEDS_ON 0x0
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#define FUDGE(x) ((x >= 0xa && x <= 0xf) ? (x + 'a') & 0x7f : (x + '0') & 0x7f)
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extern void led_putnum( char );
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#endif /* __LEDS_H__ */
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/*
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* leds.c -- control the led's on a Motorola mc68ec0x0 (IDP)board.
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*/
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#include "leds.h"
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void zylons();
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void led_putnum();
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/*
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* led_putnum -- print a hex number on the LED. the value of num must be a char with
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* the ascii value. ie... number 0 is '0', a is 'a', ' ' (null) clears
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* the led display.
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* Setting the bit to 0 turns it on, 1 turns it off.
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* the LED's are controlled by setting the right bit mask in the base
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* address.
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* The bits are:
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* [d.p | g | f | e | d | c | b | a ] is the byte.
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*
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* The locations are:
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*
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* a
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* -----
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* f | | b
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* | g |
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* -----
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* | |
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* e | | c
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* -----
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* d . d.p (decimal point)
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*/
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void
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led_putnum ( num )
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char num;
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{
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static unsigned char *leds = (unsigned char *)LED_ADDR;
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static unsigned char num_bits [18] = {
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0xff, /* clear all */
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0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x98, /* numbers 0-9 */
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0x98, 0x20, 0x3, 0x27, 0x21, 0x4, 0xe /* letters a-f */
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};
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if (num >= '0' && num <= '9')
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num = (num - '0') + 1;
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if (num >= 'a' && num <= 'f')
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num = (num - 'a') + 12;
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if (num == ' ')
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num = 0;
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*leds = num_bits[num];
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}
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/*
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* zylons -- draw a rotating pattern. NOTE: this function never returns.
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*/
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void
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zylons()
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{
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unsigned char *leds = (unsigned char *)LED_ADDR;
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unsigned char curled = 0xfe;
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while (1)
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{
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*leds = curled;
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curled = (curled >> 1) | (curled << 7);
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delay ( 200 );
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}
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}
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</pre></div>
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<a name="SEC_Contents"></a>
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<h2 class="contents-heading">Table of Contents</h2>
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<div class="contents">
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<ul class="no-bullet">
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<li><a name="toc-Libgloss-1" href="Libgloss.html#Libgloss">1 Libgloss</a>
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<ul class="no-bullet">
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<li><a name="toc-Supported-Targets" href="Supported-targets.html#Supported-targets">1.1 Supported Targets</a>
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<ul class="no-bullet">
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<li><a name="toc-Sparclite-Targets-Supported" href="Sparclite.html#Sparclite">1.1.1 Sparclite Targets Supported</a></li>
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<li><a name="toc-Motorola-CPU32-Targets-supported" href="CPU32.html#CPU32">1.1.2 Motorola CPU32 Targets supported</a></li>
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<li><a name="toc-Mips-core-Targets-Supported" href="Mips.html#Mips">1.1.3 Mips core Targets Supported</a></li>
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<li><a name="toc-PA_002dRISC-Targets-Supported" href="PA_002dRISC.html#PA_002dRISC">1.1.4 PA-RISC Targets Supported</a></li>
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</ul></li>
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<li><a name="toc-Configuring-and-building-libgloss_002e" href="Building-libgloss.html#Building-libgloss">1.2 Configuring and building libgloss.</a></li>
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<li><a name="toc-Adding-Support-for-a-New-Board" href="Board-support.html#Board-support">1.3 Adding Support for a New Board</a></li>
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</ul></li>
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<li><a name="toc-Porting-GCC" href="GCC.html#GCC">2 Porting GCC</a>
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<ul class="no-bullet">
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<li><a name="toc-Compilation-passes" href="Overview.html#Overview">2.1 Compilation passes</a></li>
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</ul></li>
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<li><a name="toc-Porting-newlib" href="Libraries.html#Libraries">3 Porting newlib</a>
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<ul class="no-bullet">
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<li><a name="toc-Crt0_002c-the-main-startup-file" href="Crt0.html#Crt0">3.1 Crt0, the main startup file</a></li>
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<li><a name="toc-Linker-scripts-for-memory-management" href="Linker-Scripts.html#Linker-Scripts">3.2 Linker scripts for memory management</a></li>
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<li><a name="toc-What-to-do-when-you-have-a-binary-image" href="What-to-do-now.html#What-to-do-now">3.3 What to do when you have a binary image</a></li>
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<li><a name="toc-Libraries-1" href="Libc.html#Libc">3.4 Libraries</a>
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<ul class="no-bullet">
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<li><a name="toc-Making-I_002fO-work" href="I_002fO-Support.html#I_002fO-Support">3.4.1 Making I/O work</a></li>
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<li><a name="toc-Routines-for-dynamic-memory-allocation" href="Memory-Support.html#Memory-Support">3.4.2 Routines for dynamic memory allocation</a></li>
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<li><a name="toc-Misc-support-routines" href="Misc-Support.html#Misc-Support">3.4.3 Misc support routines</a></li>
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<li><a name="toc-Useful-debugging-functions" href="Debugging.html#Debugging">3.4.4 Useful debugging functions</a></li>
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</ul></li>
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</ul></li>
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<li><a name="toc-Writing-a-new-GDB-backend" href="GDB.html#GDB">4 Writing a new GDB backend</a>
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<ul class="no-bullet">
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<li><a name="toc-The-standard-remote-protocol" href="GNU-remote-protocol.html#GNU-remote-protocol">4.1 The standard remote protocol</a></li>
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<li><a name="toc-A-linked-in-exception-handler" href="Exception-handler.html#Exception-handler">4.2 A linked in exception handler</a></li>
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<li><a name="toc-Using-a-ROM-monitor-as-a-backend" href="ROM-monitors.html#ROM-monitors">4.3 Using a ROM monitor as a backend</a></li>
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<li><a name="toc-Adding-support-for-new-protocols" href="Other-remote-protocols.html#Other-remote-protocols">4.4 Adding support for new protocols</a></li>
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</ul></li>
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<li><a name="toc-Code-Listings-1" href="Code-Listings.html#Code-Listings">Appendix A Code Listings</a>
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<ul class="no-bullet">
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<li><a name="toc-Linker-script-for-the-IDP-board" href="idp_002eld.html#idp_002eld">A.1 Linker script for the IDP board</a></li>
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<li><a name="toc-crt0_002eS-_002d-The-startup-file" href="crt0_002eS.html#crt0_002eS">A.2 crt0.S - The startup file</a></li>
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<li><a name="toc-C-based-_0022glue_0022-code_002e" href="glue_002ec.html#glue_002ec">A.3 C based "glue" code.</a></li>
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<li><a name="toc-I_002fO-assembler-code-sample" href="mvme_002eS.html#mvme_002eS">A.4 I/O assembler code sample</a></li>
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<li><a name="toc-I_002fO-code-sample" href="io_002ec.html#io_002ec">A.5 I/O code sample</a></li>
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<li><a name="toc-Led-control-sample" href="#leds_002ec">A.6 Led control sample</a></li>
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</ul></li>
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</ul>
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</div>
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<hr>
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<div class="header">
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<p>
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Previous: <a href="io_002ec.html#io_002ec" accesskey="p" rel="prev">io.c</a>, Up: <a href="Code-Listings.html#Code-Listings" accesskey="u" rel="up">Code Listings</a> [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>]</p>
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</div>
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</body>
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