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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic reference/reference topic reference" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/peripheral/touch-drive-examples.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">核心函数参考示例</h1><div class="date inPage">5 Dec 2024</div><div style="color: gray;">
Read time: 6 minute(s)
</div><div class="- topic/body reference/refbody body refbody"><p class="- topic/shortdesc shortdesc"></p><div class="- topic/example example" id="reference_qpq_jwf_1dc__example_rg2_mxf_1dc" data-ofbid="reference_qpq_jwf_1dc__example_rg2_mxf_1dc"><h2 class="- topic/title title sectiontitle">写寄存器函数：用于向 gt911 发送控制命令或数据</h2>
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="reference_qpq_jwf_1dc__codeblock_sg2_mxf_1dc" data-ofbid="reference_qpq_jwf_1dc__codeblock_sg2_mxf_1dc"><strong class="hl-keyword">static</strong> rt_err_t gt911_write_reg(<strong class="hl-keyword">struct</strong> rt_i2c_client *dev, rt_uint8_t *data,
rt_uint8_t len)
{
<strong class="hl-keyword">struct</strong> rt_i2c_msg msgs;
msgs.addr = dev-&gt;client_addr; <em class="hl-comment">//CTP 从机地址</em>
msgs.flags = RT_I2C_WR; <em class="hl-comment">//i2c 读写标志，这里是写标志</em>
msgs.buf = data; <em class="hl-comment">//要写入的数据</em>
msgs.len = len; <em class="hl-comment">//写入的长度</em>
<strong class="hl-keyword">if</strong> (rt_i2c_transfer(dev-&gt;bus, &amp;msgs, <span class="hl-number">1</span>) == <span class="hl-number">1</span>) { <em class="hl-comment">//i2c 标准读写接口，第一个参数是 i2c 总线句柄，第二个是 msgs，但三个 msgs 的数量</em>
<strong class="hl-keyword">return</strong> RT_EOK;
} <strong class="hl-keyword">else</strong> {
<strong class="hl-keyword">return</strong> -RT_ERROR;
}
}</pre>
</div><div class="- topic/example example" id="reference_qpq_jwf_1dc__example_tg2_mxf_1dc" data-ofbid="reference_qpq_jwf_1dc__example_tg2_mxf_1dc"><h2 class="- topic/title title sectiontitle">读寄存器函数：用于从 gt911 读取状态或数据</h2>
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="reference_qpq_jwf_1dc__codeblock_ug2_mxf_1dc" data-ofbid="reference_qpq_jwf_1dc__codeblock_ug2_mxf_1dc"><strong class="hl-keyword">static</strong> rt_err_t gt911_read_regs(<strong class="hl-keyword">struct</strong> rt_i2c_client *dev, rt_uint8_t *reg,
rt_uint8_t *data, rt_uint8_t len)
{
<strong class="hl-keyword">struct</strong> rt_i2c_msg msgs[<span class="hl-number">2</span>];
msgs[<span class="hl-number">0</span>].addr = dev-&gt;client_addr;
msgs[<span class="hl-number">0</span>].flags = RT_I2C_WR;
msgs[<span class="hl-number">0</span>].buf = reg; <em class="hl-comment">//要读取的寄存器的地址，一般是 8 位的地址，但如 gt911 就有 16 位，需要每一次写入高 8 位和低 8 位两个 buf</em>
msgs[<span class="hl-number">0</span>].len = GT911_REGITER_LEN; <em class="hl-comment">//这个与寄存器地址长度对应，8 位写 1，16 位写 2</em>
msgs[<span class="hl-number">1</span>].addr = dev-&gt;client_addr;
msgs[<span class="hl-number">1</span>].flags = RT_I2C_RD; <em class="hl-comment">//读标志</em>
msgs[<span class="hl-number">1</span>].buf = data; <em class="hl-comment">//读取到数据存放位置</em>
msgs[<span class="hl-number">1</span>].len = len; <em class="hl-comment">//要读取的长度</em>
<strong class="hl-keyword">if</strong> (rt_i2c_transfer(dev-&gt;bus, msgs, <span class="hl-number">2</span>) == <span class="hl-number">2</span>) { <em class="hl-comment">//标准的 i2c 读流程都是先写后读，先把要读的寄存器发出去，再读数据，所以这里 msgs 的数量是 2</em>
<strong class="hl-keyword">return</strong> RT_EOK;
} <strong class="hl-keyword">else</strong> {
<strong class="hl-keyword">return</strong> -RT_ERROR;
}
}</pre>
</div><div class="- topic/example example" id="reference_qpq_jwf_1dc__example_vg2_mxf_1dc" data-ofbid="reference_qpq_jwf_1dc__example_vg2_mxf_1dc"><h2 class="- topic/title title sectiontitle">gt911 获得设备 ID 函数编写</h2>
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="reference_qpq_jwf_1dc__codeblock_wg2_mxf_1dc" data-ofbid="reference_qpq_jwf_1dc__codeblock_wg2_mxf_1dc"><strong class="hl-keyword">static</strong> rt_err_t gt911_get_product_id(<strong class="hl-keyword">struct</strong> rt_i2c_client *dev,
rt_uint8_t *data, rt_uint8_t len)
{
rt_uint8_t reg[<span class="hl-number">2</span>];
reg[<span class="hl-number">0</span>] = (rt_uint8_t)(GT911_PRODUCT_ID &gt;&gt; <span class="hl-number">8</span>);
reg[<span class="hl-number">1</span>] = (rt_uint8_t)(GT911_PRODUCT_ID &amp; <span class="hl-number">0xff</span>);
<strong class="hl-keyword">if</strong> (gt911_read_regs(dev, reg, data, len) != RT_EOK) {
LOG_E(<span class="hl-string">"read id failed"</span>);
<strong class="hl-keyword">return</strong> -RT_ERROR;
}
<strong class="hl-keyword">return</strong> RT_EOK;
}</pre>
<div class="- topic/p p" data-ofbid="d199564e42__20250121171633">
<div class="- topic/div div section">
<p class="- topic/p p" data-ofbid="d199564e46__20250121171633">以
gt911 获得设备 ID 的函数来讲解一下 gt911 读函数的使用：</p>
<ul class="- topic/ul ul simple" id="reference_qpq_jwf_1dc__ul_xg2_mxf_1dc" data-ofbid="reference_qpq_jwf_1dc__ul_xg2_mxf_1dc"><li class="- topic/li li" data-ofbid="d199564e51__20250121171633">
<p class="- topic/p p" data-ofbid="d199564e53__20250121171633">第一步是定义一个 rt_uint8_t 的数组;</p>
</li><li class="- topic/li li" data-ofbid="d199564e56__20250121171633">第二步将要读取的寄存器赋值给数组<ul class="- topic/ul ul" id="reference_qpq_jwf_1dc__ul_zg2_mxf_1dc" data-ofbid="reference_qpq_jwf_1dc__ul_zg2_mxf_1dc"><li class="- topic/li li" data-ofbid="d199564e59__20250121171633">
<p class="- topic/p p" data-ofbid="d199564e61__20250121171633">16 位的 CTP 需将高 8 位赋值给 reg[0]，低 8 位赋值给 reg[1]</p>
</li><li class="- topic/li li" data-ofbid="d199564e64__20250121171633">
<p class="- topic/p p" data-ofbid="d199564e66__20250121171633">8 位的 CTP 则只需要把寄存器直接赋给 reg[0]</p>
</li></ul></li><li class="- topic/li li" data-ofbid="d199564e69__20250121171633">
<p class="- topic/p p" data-ofbid="d199564e71__20250121171633">第三步调用自己编写的 CTP 读函数把相关的参数传递过去。</p>
</li></ul>
<div class="- topic/note note note note_note" id="reference_qpq_jwf_1dc__note_bg3_dyf_1dc" data-ofbid="reference_qpq_jwf_1dc__note_bg3_dyf_1dc"><span class="note__title">注：</span>
<p class="- topic/p p" data-ofbid="d199564e77__20250121171633">若某些触控芯片无设备 ID 寄存器，则此函数可直接返回成功状态。</p>
</div>
</div>
</div>
</div><div class="- topic/example example" id="reference_qpq_jwf_1dc__example_yw1_pxf_1dc" data-ofbid="reference_qpq_jwf_1dc__example_yw1_pxf_1dc"><h2 class="- topic/title title sectiontitle">gt911 获得设备信息参数函数</h2>
<p class="- topic/p p" data-ofbid="d199564e89__20250121171633">此函数旨在提取触控屏的关键信息，如分辨率、坐标范围。其编写逻辑与获取 ID 相似，利用读寄存器操作完成。</p>
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="reference_qpq_jwf_1dc__codeblock_nd4_cyf_1dc" data-ofbid="reference_qpq_jwf_1dc__codeblock_nd4_cyf_1dc"><strong class="hl-keyword">static</strong> rt_err_t gt911_get_info(<strong class="hl-keyword">struct</strong> rt_i2c_client *dev,
<strong class="hl-keyword">struct</strong> rt_touch_info *info)</pre>
</div><div class="- topic/example example" id="reference_qpq_jwf_1dc__example_iw3_pxf_1dc" data-ofbid="reference_qpq_jwf_1dc__example_iw3_pxf_1dc"><h2 class="- topic/title title sectiontitle">gt911 读坐标点函数</h2>
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="reference_qpq_jwf_1dc__codeblock_or2_wxf_1dc" data-ofbid="reference_qpq_jwf_1dc__codeblock_or2_wxf_1dc"><strong class="hl-keyword">static</strong> rt_size_t gt911_read_point(<strong class="hl-keyword">struct</strong> rt_touch_device *touch, <strong class="hl-keyword">void</strong> *buf,
rt_size_t read_num)</pre>
<p class="- topic/p p" data-ofbid="d199564e103__20250121171633">此为核心函数，负责读取触控点坐标及事件类型（如按下、移动、抬起）。利用之前定义的读写函数，结合逻辑判断处理触控事件，由于篇幅过长在这里不一一展开，建议参考 gt911 驱动。</p>
</div><div class="- topic/example example" id="reference_qpq_jwf_1dc__example_hmk_pxf_1dc" data-ofbid="reference_qpq_jwf_1dc__example_hmk_pxf_1dc"><h2 class="- topic/title title sectiontitle">gt911 控制函数</h2>
<p class="- topic/p p" data-ofbid="d199564e111__20250121171633">此函数提供了通过命令控制触控面板的能力，涵盖获取 ID、信息查询及参数设置等功能，是驱动对外交互的接口。</p>
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="reference_qpq_jwf_1dc__codeblock_jsd_wxf_1dc" data-ofbid="reference_qpq_jwf_1dc__codeblock_jsd_wxf_1dc"><strong class="hl-keyword">static</strong> rt_err_t gt911_control(<strong class="hl-keyword">struct</strong> rt_touch_device *touch, <strong class="hl-keyword">int</strong> cmd, <strong class="hl-keyword">void</strong> *arg)</pre>
</div><div class="- topic/example example" id="reference_qpq_jwf_1dc__example_f2m_pxf_1dc" data-ofbid="reference_qpq_jwf_1dc__example_f2m_pxf_1dc"><h2 class="- topic/title title sectiontitle">gt911 ops 注册函数</h2>
<p class="- topic/p p" data-ofbid="d199564e122__20250121171633">此函数将读点和控制功能注册到触摸驱动框架中，确保系统能正确调用这些操作</p>
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="reference_qpq_jwf_1dc__codeblock_m2b_wxf_1dc" data-ofbid="reference_qpq_jwf_1dc__codeblock_m2b_wxf_1dc"><strong class="hl-keyword">static</strong> <strong class="hl-keyword">struct</strong> rt_touch_ops gt911_touch_ops = {
.touch_readpoint = gt911_read_point,
.touch_control = gt911_control,
};</pre>
</div><div class="- topic/example example" id="reference_qpq_jwf_1dc__example_w1f_wyf_1dc" data-ofbid="reference_qpq_jwf_1dc__example_w1f_wyf_1dc"><h2 class="- topic/title title sectiontitle">gt911 gpio 引脚定义函数</h2>
<p class="- topic/p p" data-ofbid="d199564e133__20250121171633">此函数提供了通过命令控制触控面板的能力，涵盖获取 ID、信息查询及参数设置等功能，是驱动对外交互的接口。</p>
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="reference_qpq_jwf_1dc__codeblock_x1f_wyf_1dc" data-ofbid="reference_qpq_jwf_1dc__codeblock_x1f_wyf_1dc"><strong class="hl-keyword">static</strong> <strong class="hl-keyword">int</strong> rt_gt911_gpio_cfg()
{
<strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">int</strong> g, p;
<strong class="hl-keyword">long</strong> pin;
<em class="hl-comment">// RST</em>
pin = drv_pin_get(GT911_RST_PIN); <em class="hl-comment">//复位引脚的宏定义</em>
g = GPIO_GROUP(pin);
p = GPIO_GROUP_PIN(pin);
hal_gpio_direction_input(g, p);
<em class="hl-comment">// INT</em>
pin = drv_pin_get(GT911_INT_PIN); <em class="hl-comment">//中断引脚的宏定义</em>
g = GPIO_GROUP(pin);
p = GPIO_GROUP_PIN(pin);
hal_gpio_direction_input(g, p);
hal_gpio_set_irq_mode(g, p, <span class="hl-number">0</span>);
<strong class="hl-keyword">return</strong> <span class="hl-number">0</span>;
}</pre>
</div><div class="- topic/example example" id="reference_qpq_jwf_1dc__example_vtm_pxf_1dc" data-ofbid="reference_qpq_jwf_1dc__example_vtm_pxf_1dc"><h2 class="- topic/title title sectiontitle">gt911 初始化函数</h2>
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="reference_qpq_jwf_1dc__codeblock_h4x_vxf_1dc" data-ofbid="reference_qpq_jwf_1dc__codeblock_h4x_vxf_1dc"><strong class="hl-keyword">static</strong> <strong class="hl-keyword">int</strong> rt_hw_gt911_init(<strong class="hl-keyword">const</strong> <strong class="hl-keyword">char</strong> *name, <strong class="hl-keyword">struct</strong> rt_touch_config *cfg)
{
<strong class="hl-keyword">struct</strong> rt_touch_device *touch_device = RT_NULL; <em class="hl-comment">//初始化触摸设备句柄</em>
touch_device =
(<strong class="hl-keyword">struct</strong> rt_touch_device *)rt_malloc(<strong class="hl-keyword">sizeof</strong>(<strong class="hl-keyword">struct</strong> rt_touch_device)); <em class="hl-comment">//动态分配内存</em>
<strong class="hl-keyword">if</strong> (touch_device == RT_NULL) {
LOG_E(<span class="hl-string">"touch device malloc fail"</span>);
<strong class="hl-keyword">return</strong> -RT_ERROR;
}
rt_memset((<strong class="hl-keyword">void</strong> *)touch_device, <span class="hl-number">0</span>, <strong class="hl-keyword">sizeof</strong>(<strong class="hl-keyword">struct</strong> rt_touch_device)); <em class="hl-comment">//初始化内存空间为 0</em>
<em class="hl-comment">/* hw init*/</em>
<em class="hl-comment">// rst output 0</em>
rt_pin_mode(*(rt_uint8_t *)cfg-&gt;user_data, PIN_MODE_OUTPUT); <em class="hl-comment">//设置复位引脚的方向</em>
rt_pin_write(*(rt_uint8_t *)cfg-&gt;user_data, PIN_LOW); <em class="hl-comment">//设置输出低电平</em>
rt_thread_delay(<span class="hl-number">10</span>); <em class="hl-comment">//一般设置完输出要延时一段时间，具体多少看规格书</em>
<em class="hl-comment">// irq output 0</em>
rt_pin_mode(cfg-&gt;irq_pin.pin, PIN_MODE_OUTPUT); <em class="hl-comment">//设置中断引脚的方向</em>
rt_pin_write(cfg-&gt;irq_pin.pin, PIN_LOW);
rt_thread_delay(<span class="hl-number">2</span>);
<em class="hl-comment">// rst output 1</em>
rt_pin_mode(*(rt_uint8_t *)cfg-&gt;user_data, PIN_MODE_OUTPUT);
rt_pin_write(*(rt_uint8_t *)cfg-&gt;user_data, PIN_HIGH); <em class="hl-comment">//设置输出高电平</em>
rt_thread_delay(<span class="hl-number">5</span>);
<em class="hl-comment">// rst input</em>
rt_pin_mode(*(rt_uint8_t *)cfg-&gt;user_data, PIN_MODE_INPUT);
<em class="hl-comment">//irq output 0</em>
rt_pin_mode(cfg-&gt;irq_pin.pin, PIN_MODE_OUTPUT);
rt_pin_write(cfg-&gt;irq_pin.pin, PIN_LOW);
rt_thread_delay(<span class="hl-number">50</span>);
rt_pin_mode(cfg-&gt;irq_pin.pin, PIN_MODE_INPUT);
gt911_client.bus =
(<strong class="hl-keyword">struct</strong> rt_i2c_bus_device *)rt_device_find(cfg-&gt;dev_name); <em class="hl-comment">//寻找 i2c 总线</em>
<strong class="hl-keyword">if</strong> (gt911_client.bus == RT_NULL) {
LOG_E(<span class="hl-string">"Can't find %s device"</span>, cfg-&gt;dev_name);
<strong class="hl-keyword">return</strong> -RT_ERROR;
}
<strong class="hl-keyword">if</strong> (rt_device_open((rt_device_t)gt911_client.bus, RT_DEVICE_FLAG_RDWR) !=
RT_EOK) { <em class="hl-comment">//打开设备</em>
LOG_E(<span class="hl-string">"open %s device failed"</span>, cfg-&gt;dev_name);
<strong class="hl-keyword">return</strong> -RT_ERROR;
}
gt911_client.client_addr = GT911_ADDRESS_HIGH; <em class="hl-comment">//将 CTP 的设备地址进行赋值</em>
<em class="hl-comment">/* register touch device */</em>
touch_device-&gt;info.type = RT_TOUCH_TYPE_CAPACITANCE;
touch_device-&gt;info.vendor = RT_TOUCH_VENDOR_GT;
rt_memcpy(&amp;touch_device-&gt;config, cfg, <strong class="hl-keyword">sizeof</strong>(<strong class="hl-keyword">struct</strong> rt_touch_config));
touch_device-&gt;ops = &amp;gt911_touch_ops;
<strong class="hl-keyword">if</strong> (RT_EOK != rt_hw_touch_register(touch_device, name, RT_DEVICE_FLAG_INT_RX, RT_NULL)) { <em class="hl-comment">//注册触摸设备</em>
LOG_E(<span class="hl-string">"touch device gt911 init failed !!!"</span>);
<strong class="hl-keyword">return</strong> -RT_ERROR;
}
LOG_I(<span class="hl-string">"touch device gt911 init success"</span>);
<strong class="hl-keyword">return</strong> RT_EOK;
}</pre>
<p class="- topic/p p" data-ofbid="d199564e147__20250121171633">此函数完成硬件初始化、I²C 总线配置、设备结构体设置及注册触摸设备等关键步骤。遵循芯片规格书中关于复位和中断引脚的操作时序</p>
</div><div class="- topic/example example" id="reference_qpq_jwf_1dc__example_wjn_pxf_1dc" data-ofbid="reference_qpq_jwf_1dc__example_wjn_pxf_1dc"><h2 class="- topic/title title sectiontitle">gt911 驱动注册函数</h2>
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="reference_qpq_jwf_1dc__codeblock_qt1_5xf_1dc" data-ofbid="reference_qpq_jwf_1dc__codeblock_qt1_5xf_1dc"><strong class="hl-keyword">static</strong> <strong class="hl-keyword">int</strong> rt_hw_gt911_port(<strong class="hl-keyword">void</strong>)
{
<strong class="hl-keyword">struct</strong> rt_touch_config cfg;
rt_uint8_t rst_pin;
rt_gt911_gpio_cfg();
rst_pin = drv_pin_get(GT911_RST_PIN); <em class="hl-comment">//复位引脚宏定义</em>
cfg.dev_name = GT911_I2C_CHAN;
cfg.irq_pin.pin = drv_pin_get(GT911_INT_PIN); <em class="hl-comment">//中断引脚宏定义</em>
cfg.irq_pin.mode = PIN_MODE_INPUT;
cfg.user_data = &amp;rst_pin;
rt_hw_gt911_init(<span class="hl-string">"gt911"</span>, &amp;cfg);
<strong class="hl-keyword">return</strong> <span class="hl-number">0</span>;
}
INIT_DEVICE_EXPORT(rt_hw_gt911_port);</pre>
<p class="- topic/p p" data-ofbid="d199564e158__20250121171633">通过宏
<span class="+ topic/keyword pr-d/apiname keyword apiname">INIT_DEVICE_EXPORT</span>，驱动在系统启动时自动加载。只需调整引脚宏定义和设备名称，即可轻松适配不同型号的触控芯片，假设硬件 CTP 是 FT7411 则将示例中的 gt911 替换为 ft7411，以及修改对应的引脚宏定义</p>
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<div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-title"><a href="#reference_qpq_jwf_1dc__example_rg2_mxf_1dc" data-tocid="reference_qpq_jwf_1dc__example_rg2_mxf_1dc">写寄存器函数：用于向 gt911 发送控制命令或数据</a></li><li class="section-title"><a href="#reference_qpq_jwf_1dc__example_tg2_mxf_1dc" data-tocid="reference_qpq_jwf_1dc__example_tg2_mxf_1dc">读寄存器函数：用于从 gt911 读取状态或数据</a></li><li class="section-title"><a href="#reference_qpq_jwf_1dc__example_vg2_mxf_1dc" data-tocid="reference_qpq_jwf_1dc__example_vg2_mxf_1dc">gt911 获得设备 ID 函数编写</a></li><li class="section-title"><a href="#reference_qpq_jwf_1dc__example_yw1_pxf_1dc" data-tocid="reference_qpq_jwf_1dc__example_yw1_pxf_1dc">gt911 获得设备信息参数函数</a></li><li class="section-title"><a href="#reference_qpq_jwf_1dc__example_iw3_pxf_1dc" data-tocid="reference_qpq_jwf_1dc__example_iw3_pxf_1dc">gt911 读坐标点函数</a></li><li class="section-title"><a href="#reference_qpq_jwf_1dc__example_hmk_pxf_1dc" data-tocid="reference_qpq_jwf_1dc__example_hmk_pxf_1dc">gt911 控制函数</a></li><li class="section-title"><a href="#reference_qpq_jwf_1dc__example_f2m_pxf_1dc" data-tocid="reference_qpq_jwf_1dc__example_f2m_pxf_1dc">gt911 ops 注册函数</a></li><li class="section-title"><a href="#reference_qpq_jwf_1dc__example_w1f_wyf_1dc" data-tocid="reference_qpq_jwf_1dc__example_w1f_wyf_1dc">gt911 gpio 引脚定义函数</a></li><li class="section-title"><a href="#reference_qpq_jwf_1dc__example_vtm_pxf_1dc" data-tocid="reference_qpq_jwf_1dc__example_vtm_pxf_1dc">gt911 初始化函数</a></li><li class="section-title"><a href="#reference_qpq_jwf_1dc__example_wjn_pxf_1dc" data-tocid="reference_qpq_jwf_1dc__example_wjn_pxf_1dc">gt911 驱动注册函数</a></li></ul></div>
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