USART控制pwm参数
时间: 2023-08-08 18:05:07 浏览: 63
好的,你需要我编写一个USART控制PWM参数的程序是吗?
在这个程序中,我们需要通过USART串口通信来接收外部设备发送的PWM参数,然后将这些参数应用到PWM控制器中,从而控制PWM输出的占空比。
下面是一个简单的USART控制PWM参数的程序示例,你可以根据实际情况进行修改:
```c
#include <stm32f10x.h>
// PWM参数
uint16_t duty_cycle = 0;
// USART接收中断处理函数
void USART1_IRQHandler(void)
{
// 判断是否接收到数据
if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
// 读取接收到的数据
uint8_t data = USART_ReceiveData(USART1);
// 根据接收到的数据更新PWM参数
if (data >= '0' && data <= '9')
{
duty_cycle = (data - '0') * 100;
}
else if (data >= 'a' && data <= 'f')
{
duty_cycle = (data - 'a' + 10) * 100;
}
}
}
int main(void)
{
// 初始化USART
USART_InitTypeDef USART_InitStructure;
USART_InitStructure.USART_BaudRate = 9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx;
USART_Init(USART1, &USART_InitStructure);
USART_Cmd(USART1, ENABLE);
// 初始化PWM控制器
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period = 9999;
TIM_TimeBaseStructure.TIM_Prescaler = 71;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
TIM_Cmd(TIM3, ENABLE);
// 启用USART接收中断
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
// 控制循环
while (1)
{
// 更新PWM占空比
TIM_SetCompare1(TIM3, duty_cycle);
// 延时一段时间
for (int i = 0; i < 1000000; i++);
}
}
```
在这个程序中,我们使用USART1串口接收外部设备发送的PWM参数,根据接收到的数据更新PWM参数duty_cycle,然后通过TIM3控制器的PWM输出通道1,将PWM占空比设置为duty_cycle。
需要注意的是,这个程序中的PWM输出通道是PA1,如果你使用的是其他的PWM输出通道,需要相应地修改代码中的GPIO初始化和TIM_OC1Init函数的参数。
希望这个程序能够帮助你!