stm32发送串口改变pwm占空比代码
时间: 2023-10-21 19:04:51 浏览: 169
以下是实现该功能的示例代码:
```c
#include "stm32f4xx.h"
void UART_Config(void);
void PWM_Config(void);
int main(void)
{
UART_Config();
PWM_Config();
while(1)
{
uint8_t data;
if(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == SET)
{
data = USART_ReceiveData(USART1);
TIM_SetCompare1(TIM4, data);
}
}
}
void UART_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_USART1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_USART1);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_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_Mode_Tx;
USART_Init(USART1, &USART_InitStructure);
USART_Cmd(USART1, ENABLE);
}
void PWM_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBase_InitStructure;
TIM_OCInitTypeDef TIM_OC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_TIM4);
TIM_TimeBase_InitStructure.TIM_Prescaler = 83; // =84-1, 84MHz/84=1MHz
TIM_TimeBase_InitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBase_InitStructure.TIM_Period = 999; // PWM frequency = 1MHz/(999+1) = 1kHz
TIM_TimeBase_InitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM4,&TIM_TimeBase_InitStructure);
TIM_OC_InitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OC_InitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OC_InitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC_InitStructure.TIM_Pulse = 500; // initial PWM duty cycle = 50%
TIM_OC1Init(TIM4, &TIM_OC_InitStructure);
TIM_Cmd(TIM4, ENABLE);
}
```
这段代码实现了一个基于STM32的串口控制PWM的功能。用户可以通过串口发送值来改变PWM的占空比。具体实现方式是,每当串口接收到一个字节时,就将该字节的值设为PWM的占空比。例如,如果用户发送的字节为 128,则PWM的占空比就会被设置为 50%。另外,为了方便起见,本代码假设用户是以 9600bps 的波特率通过USART1发送数据的。
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