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href="../../../topics/sdk/rtc/rtc-design-intro.html" id="rtc_design_intro-d4445e3592-link">设计说明</a></div></div><ul role="group" class="navbar-nav nav-list"><li role="treeitem"><div data-tocid="rtc_key_procedures-d4445e3606" class="topicref" data-id="rtc_key_procedures" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/rtc/rtc-key-procedure.html" id="rtc_key_procedures-d4445e3606-link">关键流程设计</a></div></div></li><li role="treeitem"><div data-tocid="rtc_data_structure-d4445e3620" class="topicref" data-id="rtc_data_structure" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/rtc/rtc-data-structure.html" id="rtc_data_structure-d4445e3620-link">数据结构设计</a></div></div></li><li role="treeitem"><div data-tocid="rtc_interface_design-d4445e3634" class="topicref" data-id="rtc_interface_design" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/rtc/rtc-interface-design.html" id="rtc_interface_design-d4445e3634-link">接口设计</a></div></div></li><li role="treeitem" class="active"><div data-tocid="rtc_demo-d4445e3648" class="topicref" data-id="rtc_demo" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/rtc/rtc-demo.html" id="rtc_demo-d4445e3648-link">Demo</a></div></div></li></ul></li><li role="treeitem"><div data-tocid="rtc_common_issues-d4445e3662" class="topicref" data-id="rtc_common_issues" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/rtc/rtc-common-issues.html" id="rtc_common_issues-d4445e3662-link">常见问题</a></div></div></li></ul></li><li role="treeitem" aria-expanded="false"><div data-tocid="tsensor-d4445e3676" class="topicref" data-id="tsensor" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action 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class="shortdesc">GE、VE、Display、DVP、MPP、MPP 播放器等多媒体模块的介绍和使用说明。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="concept_nww_hzh_pzb-d4445e5947" class="topicref" data-id="concept_nww_hzh_pzb" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action concept_nww_hzh_pzb-d4445e5947-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-interface-sdk.html" id="concept_nww_hzh_pzb-d4445e5947-link">接口</a><div class="wh-tooltip"><p class="shortdesc">CAN、CIR、GPAI、GPIO、I2C、PSADC、PWM 等接口模块的介绍和使用说明。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="chapter-safety-d4445e7944" class="topicref" data-id="chapter-safety" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action chapter-safety-d4445e7944-link" class="wh-expand-btn"></span><div class="title"><a 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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1">
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<span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" title="Edit this document" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/rtc/rtc-demo.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">Demo</h1>
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<div class="date inPage">15 Jan 2024</div><div style="color: gray;">
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Read time: 4 minute(s)
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</div>
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<div class="- topic/body concept/conbody body conbody">
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<div class="- topic/p p" data-ofbid="d129687e33__20250123155212">本次 Demo 是通过 ioctl 接口来访问设备节点
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<span class="+ topic/ph sw-d/filepath ph filepath">/dev/rtc0</span>：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_demo__codeblock_l1h_bxs_c1c" data-ofbid="rtc_demo__codeblock_l1h_bxs_c1c"><code>#include <span class="hl-string">"base.h"</span>
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#include <sys/time.h>
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#include <linux/rtc.h>
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<em class="hl-comment">/* Global macro and variables */</em>
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#<span class="hl-directive">define</span> ALARM_MAX_DELAY (<span class="hl-number">60</span> * <span class="hl-number">60</span>)
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#<span class="hl-directive">define</span> ALARM_MIN_DELAY <span class="hl-number">1</span>
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<strong class="hl-keyword">static</strong> <strong class="hl-keyword">const</strong> <strong class="hl-keyword">char</strong> sopts[] = <span class="hl-string">"d:u"</span>;
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<strong class="hl-keyword">static</strong> <strong class="hl-keyword">const</strong> <strong class="hl-keyword">struct</strong> option lopts[] = {
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{<span class="hl-string">"delay"</span>, required_argument, NULL, <span class="hl-string">'d'</span>},
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{<span class="hl-string">"usage"</span>, no_argument, NULL, <span class="hl-string">'u'</span>},
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{<span class="hl-number">0</span>, <span class="hl-number">0</span>, <span class="hl-number">0</span>, <span class="hl-number">0</span>}
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};
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<em class="hl-comment">/* Functions */</em>
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<strong class="hl-keyword">void</strong> usage(<strong class="hl-keyword">char</strong> *program)
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{
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printf(<span class="hl-string">"Usage: %s will start a timer of given seconds, and wait it\n"</span>,
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program);
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printf(<span class="hl-string">"\t -d, --delay\trange: [%d, %d]\n"</span>, ALARM_MIN_DELAY,
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ALARM_MAX_DELAY);
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printf(<span class="hl-string">"\t -u, --usage \n"</span>);
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printf(<span class="hl-string">"\n"</span>);
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printf(<span class="hl-string">"Example: %s -d 12\n\n"</span>, program);
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||
}
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<em class="hl-comment">/* Open a device file to be needed. */</em>
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<strong class="hl-keyword">int</strong> device_open(<strong class="hl-keyword">char</strong> *_fname, <strong class="hl-keyword">int</strong> _flag)
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||
{
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||
s32 fd = -<span class="hl-number">1</span>;
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||
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||
fd = open(_fname, _flag);
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||
<strong class="hl-keyword">if</strong> (fd < <span class="hl-number">0</span>) {
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||
ERR(<span class="hl-string">"Failed to open %s errno: %d[%s]\n"</span>,
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||
_fname, errno, strerror(errno));
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||
exit(<span class="hl-number">0</span>);
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||
}
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||
<strong class="hl-keyword">return</strong> fd;
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||
}
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||
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<strong class="hl-keyword">int</strong> main(<strong class="hl-keyword">int</strong> argc, <strong class="hl-keyword">char</strong> **argv)
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||
{
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<strong class="hl-keyword">int</strong> c, ret;
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<strong class="hl-keyword">int</strong> delay = <span class="hl-number">0</span>;
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<strong class="hl-keyword">int</strong> rtc_fd = -<span class="hl-number">1</span>;
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time_t tmp = <span class="hl-number">0</span>;
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||
<strong class="hl-keyword">struct</strong> rtc_time start = {<span class="hl-number">0</span>};
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||
<strong class="hl-keyword">struct</strong> rtc_time end = {<span class="hl-number">0</span>};
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||
<strong class="hl-keyword">struct</strong> rtc_wkalrm alrm_set = {<span class="hl-number">0</span>};
|
||
<strong class="hl-keyword">struct</strong> rtc_wkalrm alrm_get = {<span class="hl-number">0</span>};
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||
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||
DBG(<span class="hl-string">"Compile time: %s\n"</span>, __TIME__);
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||
<strong class="hl-keyword">while</strong> ((c = getopt_long(argc, argv, sopts, lopts, NULL)) != -<span class="hl-number">1</span>) {
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||
<strong class="hl-keyword">switch</strong> (c) {
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||
<strong class="hl-keyword">case</strong> <span class="hl-string">'d'</span>:
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||
delay = str2int(optarg);
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||
<strong class="hl-keyword">continue</strong>;
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||
<strong class="hl-keyword">case</strong> <span class="hl-string">'u'</span>:
|
||
usage(argv[<span class="hl-number">0</span>]);
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||
<strong class="hl-keyword">return</strong> <span class="hl-number">0</span>;
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||
<strong class="hl-keyword">default</strong>:
|
||
<strong class="hl-keyword">break</strong>;
|
||
}
|
||
}
|
||
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||
<strong class="hl-keyword">if</strong> ((delay < ALARM_MIN_DELAY) || (delay > ALARM_MAX_DELAY)) {
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||
ERR(<span class="hl-string">"Invalid delay: %d\n"</span>, delay);
|
||
<strong class="hl-keyword">return</strong> -<span class="hl-number">1</span>;
|
||
}
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||
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||
rtc_fd = open(<span class="hl-string">"/dev/rtc0"</span>, O_RDWR);
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||
<strong class="hl-keyword">if</strong> (rtc_fd < <span class="hl-number">0</span>) {
|
||
ERR(<span class="hl-string">"Failed to open RTC device!\n"</span>);
|
||
<strong class="hl-keyword">return</strong> -<span class="hl-number">1</span>;
|
||
}
|
||
|
||
DBG(<span class="hl-string">"ioctl(%#x)\n"</span>, RTC_RD_TIME);
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||
ret = ioctl(rtc_fd, RTC_RD_TIME, &start);
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||
<strong class="hl-keyword">if</strong> (ret < <span class="hl-number">0</span>) {
|
||
ERR(<span class="hl-string">"Failed to read RTC time!\n"</span>);
|
||
<strong class="hl-keyword">goto</strong> err;
|
||
}
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||
DBG(<span class="hl-string">"Current time: %04d-%02d-%02d %02d:%02d:%02d\n"</span>,
|
||
start.tm_year, start.tm_mon, start.tm_mday,
|
||
start.tm_hour, start.tm_min, start.tm_sec);
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||
|
||
alrm_set.enabled = <span class="hl-number">1</span>;
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||
tmp = mktime((<strong class="hl-keyword">struct</strong> tm *)&start) + delay;
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||
memcpy(&alrm_set.time, gmtime(&tmp), <strong class="hl-keyword">sizeof</strong>(<strong class="hl-keyword">struct</strong> rtc_time));
|
||
DBG(<span class="hl-string">"ioctl(%#x)\n"</span>, RTC_WKALM_SET);
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||
ret = ioctl(rtc_fd, RTC_WKALM_SET, &alrm_set);
|
||
<strong class="hl-keyword">if</strong> (ret < <span class="hl-number">0</span>) {
|
||
ERR(<span class="hl-string">"Failed to set alarm! [%d]: %s\n"</span>, errno, strerror(errno));
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||
<strong class="hl-keyword">goto</strong> err;
|
||
}
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||
DBG(<span class="hl-string">"Set a alarm to: %04d-%02d-%02d %02d:%02d:%02d\n"</span>,
|
||
alrm_set.time.tm_year, alrm_set.time.tm_mon,
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||
alrm_set.time.tm_mday, alrm_set.time.tm_hour,
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||
alrm_set.time.tm_min, alrm_set.time.tm_sec);
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||
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||
<strong class="hl-keyword">do</strong> {
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||
memset(&alrm_get, <span class="hl-number">0</span>, <strong class="hl-keyword">sizeof</strong>(<strong class="hl-keyword">struct</strong> rtc_wkalrm));
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||
DBG(<span class="hl-string">"ioctl(%#x)\n"</span>, RTC_WKALM_RD);
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||
ret = ioctl(rtc_fd, RTC_WKALM_RD, &alrm_get);
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||
<strong class="hl-keyword">if</strong> (ret < <span class="hl-number">0</span>) {
|
||
ERR(<span class="hl-string">"Failed to read alarm!\n"</span>);
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||
<strong class="hl-keyword">goto</strong> err;
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||
}
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||
<strong class="hl-keyword">if</strong> (alrm_get.pending)
|
||
<strong class="hl-keyword">break</strong>;
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||
|
||
printf(<span class="hl-string">"Waiting ...\n"</span>);
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||
usleep(<span class="hl-number">200000</span>); <em class="hl-comment">// 200ms</em>
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||
} <strong class="hl-keyword">while</strong> (<span class="hl-number">1</span>);
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||
|
||
DBG(<span class="hl-string">"ioctl(%#x)\n"</span>, RTC_RD_TIME);
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||
ret = ioctl(rtc_fd, RTC_RD_TIME, &end);
|
||
<strong class="hl-keyword">if</strong> (ret < <span class="hl-number">0</span>) {
|
||
ERR(<span class="hl-string">"Failed to read RTC time!\n"</span>);
|
||
<strong class="hl-keyword">goto</strong> err;
|
||
}
|
||
DBG(<span class="hl-string">"Current time: %04d-%02d-%02d %02d:%02d:%02d\n"</span>,
|
||
end.tm_year, end.tm_mon, end.tm_mday,
|
||
end.tm_hour, end.tm_min, end.tm_sec);
|
||
|
||
tmp = mktime((<strong class="hl-keyword">struct</strong> tm *)&end) - mktime((<strong class="hl-keyword">struct</strong> tm *)&start);
|
||
DBG(<span class="hl-string">"Start a timer of %d, actualy is %ld ...\n"</span>, delay, tmp);
|
||
<strong class="hl-keyword">if</strong> (ret != delay) {
|
||
ERR(<span class="hl-string">"The timer is not accurate!\n"</span>);
|
||
ret = -<span class="hl-number">1</span>;
|
||
}
|
||
<strong class="hl-keyword">else</strong> {
|
||
DBG(<span class="hl-string">"The timer is good!\n"</span>);
|
||
ret = <span class="hl-number">0</span>;
|
||
}
|
||
|
||
err:
|
||
<strong class="hl-keyword">if</strong> (rtc_fd > <span class="hl-number">0</span>)
|
||
close(rtc_fd);
|
||
<strong class="hl-keyword">return</strong> ret;
|
||
}
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||
</code></pre></div>
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