stm32使用tim1输出pwm不用hal库
时间: 2024-08-15 19:00:46 浏览: 82
STM32使用TIM1输出PWM而不用HAL库时,你需要手动配置TIM1的基本定时器功能和互补输出。以下是基本步骤:
1. **初始化TIM1寄存器**:
- 首先需要设置TIM1的时钟源(如分频器),例如通过`TIM_TimeBaseInitTypeDef`结构体调整预分频器和计数器的参数。
```c
TIM_TimeBaseInitTypeDef.TIM_TimeBaseInitStructure.TIM_Period = (uint16_t)(CPU_CLOCK_FREQ / PWM_FREQUENCY) - 1; // 设置周期
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseInitStructure);
```
- 然后配置TIM1工作模式为PWM(比如PWM模式2):
```c
TIM_MasterConfigTypeDef TIM_MasterConfiguration;
TIM_MasterConfiguration.TIM_MasterOutputState = TIM_MasterActive;
TIM_MasterConfiguration.TIM.MasterSlaveMode = TIM_MasterSlaveMode_Enable;
TIM_MasterConfiguration.TIM.MasterOutputTrigger = TIM_TRGO_Update;
TIM_MasterConfiguration.TIM.EmergencyStopOutputState = DISABLE;
TIM_MasterConfiguration.TIM.ClockDivision = 0;
TIM_MasterConfiguration.TIM.RepetitionCounter = 0;
TIM_MasterConfig(TIM1, &TIM_MasterConfiguration);
```
2. **配置通道和互补输出**:
- 选择通道1并配置为PWM输出:
```c
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_OCInitStructure.TIM_OCMode = TIM_OCMODE_PWM1; // PWM模式1
TIM_OCInitStructure.TIM_OutputState = TIM_PIN_STATE_HIGH; // 输出高电平启动
TIM_OCInitStructure.TIM_Pulse = 0;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPOLARITY_High; // 输出极性为正
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM1, TIM preload disabled); // 关闭预装载
```
3. **更新定时器值并使能中断**:
- 在主循环里定期更新TIM1的当前值,并开启匹配中断:
```c
uint16_t counterValue = TIM_Get CounterValue(TIM1); // 获取当前计数值
TIM_ARRPreloadCmd(TIM1, ENABLE); // 允许ARR预装载
TIM_SetCounter(TIM1, counterValue); // 更新计数器值到下一个PWM周期
NVIC_EnableIRQ(TIM1_IRQn); // 开启TIM1中断
```
4. **处理中断**:
- 创建一个中断服务函数(ISER),当TIM1匹配条件发生时会执行:
```c
void TIM1_IRQHandler(void)
{
if (TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET)
{
TIM_ClearFlag(TIM1, TIM_FLAG_Update); // 清除标志位
// 根据需要更新通道值,这里仅示例输出低电平
TIM_OC1Cmd(TIM1, DISABLE);
TIM_OC1Cmd(TIM1, ENABLE);
}
}
```
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