stm32f407使用定时器的两个通道代码
时间: 2023-10-09 14:09:06 浏览: 79
以下是使用STM32F407定时器的两个通道的代码示例:
```c
#include "stm32f4xx.h"
void TIM1_CH1_PWM_Init(uint16_t per, uint16_t psc) {
GPIO_InitTypeDef GPIO_InitStruct;
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
TIM_OCInitTypeDef TIM_OCInitStruct;
// 使能定时器1和GPIOA的时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
// 配置GPIOA的引脚为复用功能
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_7;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStruct);
// 将GPIOA的引脚与定时器1的通道1和通道1N连接起来
GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_TIM1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_TIM1);
// 配置定时器1的时基单元
TIM_TimeBaseInitStruct.TIM_Prescaler = psc - 1;
TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInitStruct.TIM_Period = per - 1;
TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInitStruct.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseInitStruct);
// 配置定时器1的通道1为PWM模式
TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStruct.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStruct.TIM_Pulse = per / 2;
TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStruct.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStruct.TIM_OCIdleState = TIM_OCIdleState_Reset;
TIM_OCInitStruct.TIM_OCNIdleState = TIM_OCNIdleState_Reset;
TIM_OC1Init(TIM1, &TIM_OCInitStruct);
// 使能定时器1的通道1和通道1N输出
TIM_CtrlPWMOutputs(TIM1, ENABLE);
// 启动定时器1
TIM_Cmd(TIM1, ENABLE);
}
int main(void) {
// 初始化定时器1的通道1和通道1N
TIM1_CH1_PWM_Init(1000, 84);
while (1) {
// 主程序逻辑
}
}
```
这段代码使用了定时器1的通道1和通道1N来实现PWM输出。在主函数中,调用`TIM1_CH1_PWM_Init(per, psc)`函数来初始化定时器1的通道1和通道1N。其中,`per`参数表示周期的值,`psc`参数表示预分频器的值。通过调整这两个参数,可以实现不同的PWM波形。在本例中,将PA6引脚连接至3.3V,可以立即停止PWM波形输出。
#### 引用[.reference_title]
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