jinglixixi 发表于 2020-12-20 00:36

【NUCLEO-L452RE测评】+OLED屏显示驱动

<div class='showpostmsg'> 本帖最后由 jinglixixi 于 2020-12-21 16:06 编辑

<p style="text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri,sans-serif">NUCLEO-L452RE<span style="font-family:宋体">开发板的周边外设比较少,为了便于人际交互最先考虑的是为其配上一个显示屏,以利于信息的观察。</span></span></span></p>

<p style="text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri,sans-serif"><span style="font-family:宋体">为了较少地占用系统资源,这里采用的是</span>I2C<span style="font-family:宋体">接口的双色</span>OLED<span style="font-family:宋体">屏,考虑到</span>NUCLEO-L452RE<span style="font-family:宋体">开发板配有</span>Arduino<span style="font-family:宋体">接口,就将</span>OLED<span style="font-family:宋体">屏放到</span>Arduino<span style="font-family:宋体">接口上来使用,从而能够不必连线就解决问题。</span></span></span></p>

<p style="text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri,sans-serif">OLED<span style="font-family:宋体">屏与</span>MCU<span style="font-family:宋体">的连接关系为:</span></span></span></p>

<p style="text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri,sans-serif">SCL---PA5</span></span></p>

<p style="text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri,sans-serif">SDA---PA6</span></span></p>

<p style="text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri,sans-serif"><span style="font-family:宋体">控制相关引脚输出高低电平的语句定义为:</span></span></span></p>

<p style="text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri,sans-serif">#define OLED_SCLK_Set()&nbsp;&nbsp;HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5,GPIO_PIN_SET)</span></span></p>

<p style="text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri,sans-serif">#define OLED_SCLK_Clr()&nbsp;&nbsp;HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5,GPIO_PIN_RESET)</span></span></p>

<p style="text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri,sans-serif">#define OLED_SDIN_Set()&nbsp;&nbsp;HAL_GPIO_WritePin(GPIOA, GPIO_PIN_6,GPIO_PIN_SET)</span></span></p>

<p style="text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri,sans-serif">#define OLED_SDIN_Clr()&nbsp;&nbsp;HAL_GPIO_WritePin(GPIOA, GPIO_PIN_6,GPIO_PIN_RESET)</span></span></p>

<p style="text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri,sans-serif"><span style="font-family:宋体">实现引脚输出功能配置的函数为:</span></span></span></p>

<pre>
<code class="language-cpp">void GPIO_OLED_INIT(void)
{
__HAL_RCC_GPIOA_CLK_ENABLE();
GPIO_InitStruct.Mode  = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
GPIO_InitStruct.Pin = GPIO_PIN_5;
HAL_GPIO_Init(GPIOA, &amp;GPIO_InitStruct);   
GPIO_InitStruct.Pin = GPIO_PIN_6;
HAL_GPIO_Init(GPIOA, &amp;GPIO_InitStruct);
}</code></pre>

<p style="text-align:justify">&nbsp;</p>

<p style="text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri,sans-serif"><span style="font-family:宋体">辅助显示函数为:</span></span></span></p>

<pre>
<code class="language-cpp">void IIC_Start()
{
OLED_SCLK_Set();
OLED_SDIN_Set();
OLED_SDIN_Clr();
OLED_SCLK_Clr();
}

void IIC_Stop()
{
OLED_SCLK_Set();
OLED_SDIN_Clr();
OLED_SDIN_Set();
}

void IIC_Wait_Ack()
{
OLED_SCLK_Set();
OLED_SCLK_Clr();
}</code></pre>

<p style="text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri,sans-serif"><span style="font-family:宋体">涉及的字符串显示函数为:</span></span></span></p>

<pre>
<code>void OLED_ShowString(u8 x,u8 y,u8 *chr,u8 Char_Size)
{
    unsigned char j=0;
    while (chr!='\0')
    {      
            OLED_ShowChar(x,y,chr,Char_Size);
            x+=8;
            if(x&gt;120){x=0;y+=2;}
            j++;
    }

}</code></pre>

<p style="text-align:justify">&nbsp;</p>

<p style="text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri,sans-serif"><span style="font-family:宋体">实现下图显示效果的主程序为:</span></span></span></p>

<pre>
<code class="language-cpp">int main(void)
{
HAL_Init();
SystemClock_Config();
GPIO_OLED_INIT();
OLED_Init();
OLED_Clear();
OLED_ShowString(8,2,"STM32L452",16);
OLED_ShowString(8,4,"OLED TEST",16);
OLED_ShowCHinese(80,2,9);
OLED_ShowCHinese(96,2,10);
OLED_ShowCHinese(112,2,11);
while (1);
}</code></pre>

<p style="text-align:justify"></p>

<p style="text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri,sans-serif">OLED<span style="font-family:宋体">屏显示效果</span></span></span></p>

<p>有了OLED屏的显示功能,后面以RTC实现一个电子时钟也就方便一些了。</p>
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okhxyyo 发表于 2020-12-21 14:31

<p><strong><a href="https://bbs.eeworld.com.cn/elecplay/content/148" target="_blank">ST NUCLEO-L452RE测评</a></strong></p>

<p>汇总贴:<a href="https://bbs.eeworld.com.cn/thread-1151850-1-1.html" target="_blank">https://bbs.eeworld.com.cn/thread-1151850-1-1.html&nbsp;</a>、</p>

zhd 发表于 2020-12-20 20:52

<p>抄的吗?</p>

jinglixixi 发表于 2020-12-20 23:12

zhd 发表于 2020-12-20 20:52
抄的吗?

<p>啥意思?</p>

zhd 发表于 2020-12-21 15:08

<p>型号不对啊?</p>

jinglixixi 发表于 2020-12-21 15:58

zhd 发表于 2020-12-21 15:08
型号不对啊?

<p>哈哈,两块板子前后脚到的,一块办程序可以共用。</p>

dql2016 发表于 2020-12-22 13:27

<p>这个液晶大点就好玩了</p>

jinglixixi 发表于 2020-12-22 14:57

dql2016 发表于 2020-12-22 13:27
这个液晶大点就好玩了

<p>下次换个2.2寸的显示屏。</p>
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