【NUCLEO-WB09KE评测】3、PWM控制LD3亮度
<p><strong><span style="font-size:18px;">目标</span></strong></p><p> STM3WB09xE有3个通用定时器(TIM2,TIM16,TIM17)</p>
<p> <span style="color:#e67e22;">Each general-purpose timer can be used to generate PWM outputs</span></p>
<p> 本次测试，利用TIM2实现PWM输出到通道3（PB2)，控制LD3亮度。</p>
<p><strong><span style="font-size:16px;">一、配置</span></strong></p>
<p>1、时钟配置</p>
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<p> </p>
<p>2、TIM2</p>
<div style="text-align: center;">
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<p> </p>
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<p style="text-align: left;">选择CHANNEL3:PWM Generation CH3</p>
<p style="text-align: left;">Prescaler:63</p>
<p style="text-align: left;">Period:499</p>
<p style="text-align: left;">主频：64MHZ</p>
<p style="text-align: left;">64000000/(64*500)=2000hz</p>
<p style="text-align: left;">占空比：300/500=60%</p>
<p style="text-align: left;">3、GPIO</p>
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<p style="text-align: left;">PB2的修改</p>
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<p><span style="font-size:16px;"><strong>二、程序</strong></span></p>
<p><span style="font-size:16px;"><strong>1、TIM2初始化</strong></span></p>
<pre>
<code class="language-cpp">static void MX_TIM2_Init(void)
{
/* USER CODE BEGIN TIM2_Init 0 */
/* USER CODE END TIM2_Init 0 */
TIM_ClockConfigTypeDef sClockSourceConfig = {0};
TIM_OC_InitTypeDef sConfigOC = {0};
/* USER CODE BEGIN TIM2_Init 1 */
/* USER CODE END TIM2_Init 1 */
htim2.Instance = TIM2;
htim2.Init.Prescaler = 63;
htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
htim2.Init.Period = 499;
htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
if (HAL_TIM_Base_Init(&htim2) != HAL_OK)
{
Error_Handler();
}
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK)
{
Error_Handler();
}
if (HAL_TIM_PWM_Init(&htim2) != HAL_OK)
{
Error_Handler();
}
sConfigOC.OCMode = TIM_OCMODE_PWM1;
sConfigOC.Pulse = 300;
sConfigOC.OCPolarity = TIM_OCPOLARITY_LOW;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
if (HAL_TIM_PWM_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_3) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN TIM2_Init 2 */
/* USER CODE END TIM2_Init 2 */
HAL_TIM_MspPostInit(&htim2);
}</code></pre>
<pre>
<code class="language-cpp">void HAL_TIM_MspPostInit(TIM_HandleTypeDef* htim)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
if(htim->Instance==TIM2)
{
/* USER CODE BEGIN TIM2_MspPostInit 0 */
/* USER CODE END TIM2_MspPostInit 0 */
__HAL_RCC_GPIOB_CLK_ENABLE();
/**TIM2 GPIO Configuration
PB2 ------> TIM2_CH3
*/
GPIO_InitStruct.Pin = GPIO_PIN_2;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF3_TIM2;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
/* USER CODE BEGIN TIM2_MspPostInit 1 */
/* USER CODE END TIM2_MspPostInit 1 */
}
}</code></pre>
<p>2、修改TIM2 CH3占空比</p>
<pre>
<code class="language-cpp">//设置 TIM 通道 3 的占空比
//compare:比较值
void TIM_SetTIM2Compare3(uint32_t compare)
{
//TIM2->CCR3=compare;
__HAL_TIM_SET_COMPARE(&htim2, TIM_CHANNEL_3, compare); // compare为新的占空比值
}</code></pre>
<p>3、main中增加HAL_TIM_PWM_Start(&htim2,TIM_CHANNEL_3);//开启 PWM 通道 3</p>
<pre>
<code class="language-cpp">MX_TIM2_Init();
HAL_TIM_PWM_Start(&htim2,TIM_CHANNEL_3);//开启 PWM 通道 3</code></pre>
<p>4、main while(1)中增加</p>
<p>调整占空比参数，改变占空比调节LD3亮度</p>
<pre>
<code class="language-cpp">while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
HAL_Delay(10);
if(dir)led3pwmval++; //dir==1 led0pwmval 递增
else led3pwmval--; //dir==0 led0pwmval 递减
if(led3pwmval>300)dir=0; //led0pwmval 到达 300 后，方向为递减
if(led3pwmval==0)dir=1; //led0pwmval 递减到 0 后，方向改为递增
printf("led3pwmval:%d\r\n",led3pwmval);
TIM_SetTIM2Compare3(led3pwmval);
}</code></pre>
<p><span style="font-size:16px;"><strong>三、运行效果</strong></span></p>
<p>59615ec0c432b61ab832a0460d4d6735<br />
</p>
<p> </p>
<p> </p>
<p>STM3WB09xE有3个通用定时器(TIM2,TIM16,TIM17)这个应该和普通芯片的控制模式是一样的，不过相对来说还是定时器比较少</p>
<p>赞！</p>
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