【NUCLEO-L496ZG评测4】定时器实现板载呼吸灯
每次做板载的呼吸灯都觉的挺有意思的，似乎是一个永不褪色的主题。板子做的好，正好有一个led灯对应着定时器，及PB7对应着定时器4的通道2。呼吸灯的原理基本就是在程序中不断的改变PWM占空比，使led呈现忽明忽暗的呼吸效果。首先当然是初始化引脚： GPIO_InitStruct.Pin = GPIO_PIN_7;GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
GPIO_InitStruct.Alternate = GPIO_AF2_TIM4;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
初始化定时器：htim4.Instance = TIM4;
htim4.Init.Prescaler =uhPrescalerValue;
htim4.Init.CounterMode = TIM_COUNTERMODE_UP;
htim4.Init.Period = 1000-1;
htim4.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
sConfigOC.OCMode = TIM_OCMODE_PWM1;
sConfigOC.Pulse = 100;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
sConfigOC.OCNIdleState = TIM_OCNIDLESTATE_RESET;
sConfigOC.OCIdleState= TIM_OCIDLESTATE_RESET;
if (HAL_TIM_PWM_ConfigChannel(&htim4, &sConfigOC, TIM_CHANNEL_2) != HAL_OK)
{
Error_Handler();
}
//HAL_TIM_MspPostInit(&htim4);
if (HAL_TIM_PWM_Start(&htim4, TIM_CHANNEL_2) != HAL_OK)
{
/* PWM Generation Error */
Error_Handler();
}
在程序中不断的修改占空比：if(flag == 0)
{
Value+=5;
HAL_Delay(20);
PWM_Chang(Value);
if(Value>=200)
flag =1;
}
最后呢，就是效果了：
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