STM32标准库配置通用定时器生成PWM
时间: 2024-01-28 22:09:41 浏览: 70
1. 配置GPIO引脚
首先需要配置GPIO引脚,将其设置为输出模式,并将其连接到定时器的通道输出。可以使用STM32的CubeMX工具来轻松完成这项任务。具体步骤如下:
1. 打开CubeMX工具,选择所需的MCU型号。
2. 点击“Pinout”选项卡,选择需要使用的GPIO引脚,右键单击它们并选择“GPIO Output”选项。
3. 单击“Clock Configuration”选项卡,使能所需的GPIO和定时器时钟。
4. 单击“Configuration”选项卡,选择所需的定时器和通道。将其设置为PWM模式,并选择所需的时钟分频器和计数器周期。
5. 配置定时器的PWM输出模式,包括极性、占空比等参数。
2. 编写代码
在代码中,需要初始化GPIO和定时器,并对定时器的PWM输出进行配置。具体实现如下:
1. 初始化GPIO引脚
```c
GPIO_InitTypeDef GPIO_InitStruct = {0};
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOA_CLK_ENABLE();
/*Configure GPIO pin : PA6 */
GPIO_InitStruct.Pin = GPIO_PIN_6;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
GPIO_InitStruct.Alternate = GPIO_AF1_TIM3;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
```
2. 初始化定时器
```c
TIM_HandleTypeDef htim3 = {0};
/* TIM3 init function */
void MX_TIM3_Init(void)
{
TIM_ClockConfigTypeDef sClockSourceConfig = {0};
TIM_MasterConfigTypeDef sMasterConfig = {0};
TIM_OC_InitTypeDef sConfigOC = {0};
htim3.Instance = TIM3;
htim3.Init.Prescaler = 0;
htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
htim3.Init.Period = 999;
htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
if (HAL_TIM_Base_Init(&htim3) != HAL_OK)
{
Error_Handler();
}
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
if (HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig) != HAL_OK)
{
Error_Handler();
}
if (HAL_TIM_PWM_Init(&htim3) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
sConfigOC.OCMode = TIM_OCMODE_PWM1;
sConfigOC.Pulse = 500;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
sConfigOC.OCNPolarity = TIM_OCNPOLARITY_HIGH;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
sConfigOC.OCIdleState = TIM_OCIDLESTATE_RESET;
sConfigOC.OCNIdleState = TIM_OCNIDLESTATE_RESET;
if (HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
{
Error_Handler();
}
}
```
3. 启动定时器
```c
HAL_TIM_PWM_Start(&htim3, TIM_CHANNEL_1);
```
4. 设置PWM占空比
```c
void set_pwm_duty_cycle(TIM_HandleTypeDef *htim, uint32_t channel, uint32_t duty_cycle)
{
TIM_OC_InitTypeDef sConfigOC = {0};
sConfigOC.OCMode = TIM_OCMODE_PWM1;
sConfigOC.Pulse = duty_cycle;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
sConfigOC.OCNPolarity = TIM_OCNPOLARITY_HIGH;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
sConfigOC.OCIdleState = TIM_OCIDLESTATE_RESET;
sConfigOC.OCNIdleState = TIM_OCNIDLESTATE_RESET;
if (HAL_TIM_PWM_ConfigChannel(htim, &sConfigOC, channel) != HAL_OK)
{
Error_Handler();
}
}
```
3. 调整PWM占空比
可以使用set_pwm_duty_cycle函数调整PWM占空比。例如,如果需要将占空比设置为50%:
```c
set_pwm_duty_cycle(&htim3, TIM_CHANNEL_1, 500);
```
注意:占空比的范围应该是0到计数器周期之间的值。例如,如果计数器周期为1000,则占空比应在0到1000之间。
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