STM32F103ZE单片机怎么利用按键进行控制串口发送数据
时间: 2023-08-04 13:04:37 浏览: 51
要利用按键来控制串口发送数据,需要进行以下步骤:
1. 配置按键引脚为输入模式,并使能它的时钟。
2. 在程序中读取按键引脚的状态,检测按键是否被按下。
3. 如果按键被按下,就发送数据到串口。可以使用USART_SendData函数来发送数据。
下面是一个简单的示例程序,演示如何利用按键控制串口发送数据:
```c
#include "stm32f10x.h"
#define USART1_TX_PIN GPIO_Pin_9
#define USART1_RX_PIN GPIO_Pin_10
#define USART1_GPIO GPIOA
#define USART1 GPIOA
#define USART1_IRQn USART1_IRQn
#define LED_PIN GPIO_Pin_12
#define LED_GPIO GPIOB
#define BUTTON_PIN GPIO_Pin_0
#define BUTTON_GPIO GPIOA
USART_InitTypeDef USART_InitStructure;
void USART1_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable GPIO clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
/* Configure USART1 Tx as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = USART1_TX_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(USART1_GPIO, &GPIO_InitStructure);
/* Configure USART1 Rx as input floating */
GPIO_InitStructure.GPIO_Pin = USART1_RX_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(USART1_GPIO, &GPIO_InitStructure);
/* Enable USART1 clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
/* Configure USART1 */
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);
/* Enable USART1 */
USART_Cmd(USART1, ENABLE);
}
void LED_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable GPIO clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
/* Configure LED pin as output push-pull */
GPIO_InitStructure.GPIO_Pin = LED_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(LED_GPIO, &GPIO_InitStructure);
}
void BUTTON_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable GPIO clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
/* Configure BUTTON pin as input pull-up */
GPIO_InitStructure.GPIO_Pin = BUTTON_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(BUTTON_GPIO, &GPIO_InitStructure);
}
void delay(uint32_t nCount)
{
uint32_t i;
for (i = 0; i < nCount; i++);
}
int main(void)
{
uint8_t button_state = 0;
uint8_t data[] = "Hello, World!\r\n";
USART1_Init();
LED_Init();
BUTTON_Init();
while (1)
{
/* Read button state */
button_state = GPIO_ReadInputDataBit(BUTTON_GPIO, BUTTON_PIN);
/* If button is pressed, send data to USART1 */
if (button_state == 0)
{
USART_SendData(USART1, data[0]);
while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
USART_SendData(USART1, data[1]);
while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
USART_SendData(USART1, data[2]);
while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
// ...
}
/* Blink LED */
GPIO_WriteBit(LED_GPIO, LED_PIN, (BitAction)(1 - GPIO_ReadOutputDataBit(LED_GPIO, LED_PIN)));
delay(100000);
}
}
```
在这个示例程序中,我们使用PB12引脚和PA0引脚分别控制LED和按键。当按键被按下时,发送一个字符串数据到USART1。注意,在实际应用中,应该使用中断来检测按键状态,而不是在主循环中不停地读取它的状态。