character1 = character2; character2 = USART_ReceiveData(USART1); combinedCharacter = (character1 << 8) | character2;
时间: 2024-04-28 10:19:54 浏览: 11
这段代码的作用是将接收到的两个字符合并成一个16位的整数combinedCharacter。
首先,将character2中存储的当前接收到的字符保存到character1中。这样就可以将上一个字符移动到character1的位置上。
然后,使用USART_ReceiveData(USART1)函数读取当前接收到的字符并保存到character2中。
最后,使用位运算将character1和character2合并成一个16位的整数combinedCharacter。在这里,character1被左移8位,然后与character2按位或,得到的结果就是合并后的16位整数。由于character1和character2都是8位的,所以合并后的combinedCharacter就是16位的。
相关问题
用C语言写stm32 uart1接收uart2发送程序
很高兴为你解决问题。以下是用C语言写stm32 uart1接收uart2发送程序的示例代码:
```
#include "stm32f10x.h"
#include <stdio.h>
void USART1_Init(void)
{
USART_InitTypeDef USART_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable USART1 and GPIOA clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);
/* Configure PA9 and PA10 as USART1 Tx and Rx */
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* USART1 configuration */
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;
/* Enable USART1 */
USART_Init(USART1, &USART_InitStructure);
USART_Cmd(USART1, ENABLE);
}
void USART2_Init(void)
{
USART_InitTypeDef USART_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable USART2 and GPIOA clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
/* Configure PA2 and PA3 as USART2 Tx and Rx */
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* USART2 configuration */
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;
/* Enable USART2 */
USART_Init(USART2, &USART_InitStructure);
USART_Cmd(USART2, ENABLE);
}
void USART_SendChar(USART_TypeDef* USARTx, uint8_t ch)
{
/* Wait until transmit data register is empty */
while (USART_GetFlagStatus(USARTx, USART_FLAG_TXE) == RESET);
/* Send a character to USART */
USART_SendData(USARTx, (uint8_t) ch);
}
uint16_t USART_ReceiveData(USART_TypeDef* USARTx)
{
/* Wait until there is some data to receive */
while (USART_GetFlagStatus(USARTx, USART_FLAG_RXNE) == RESET);
/* Read received data from USART */
return (uint16_t) USART_ReceiveData(USARTx);
}
int main(void)
{
uint16_t data;
USART1_Init();
USART2_Init();
while (1)
{
/* Receive data from USART1 */
data = USART_ReceiveData(USART1);
/* Send received data to USART2 */
USART_SendChar(USART2, (uint8_t) data);
/* Delay to avoid overloading USART */
Delay(100);
}
}
```
注意:以上示例代码仅供参考。实际情况中,您需要根据自己的需要进行修改。
stm32f103c8t6串口2代码
下面是STM32F103C8T6串口2的代码示例,包含发送和接收功能:
```c
#include "stm32f10x.h"
#include <stdio.h>
#include <string.h>
#define USART2_DR_BASE 0x40004404
#define USART2_SR_TC_BIT 6
#define USART2_SR_RXNE_BIT 5
void USART2_Init(void)
{
// Enable GPIOA and USART2 clock
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO | RCC_APB2Periph_USART1, ENABLE);
// Configure PA2 as TX and PA3 as RX
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// Configure USART2
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_Tx | USART_Mode_Rx;
USART_Init(USART2, &USART_InitStructure);
// Enable USART2
USART_Cmd(USART2, ENABLE);
}
void USART2_SendChar(char c)
{
// Wait for the transmit data register to be empty
while ((USART2->SR & (1 << USART2_SR_TC_BIT)) == 0);
// Send the character
USART2->DR = (c & 0xFF);
}
void USART2_SendString(const char* str)
{
const char* p = str;
while (*p) {
USART2_SendChar(*p++);
}
}
char USART2_ReceiveChar(void)
{
// Wait for the receive data register to be non-empty
while ((USART2->SR & (1 << USART2_SR_RXNE_BIT)) == 0);
// Read the character
return USART2->DR & 0xFF;
}
int main(void)
{
// Initialize USART2
USART2_Init();
// Send a string
USART2_SendString("Hello, world!\r\n");
// Receive a character and send it back
while (1) {
char c = USART2_ReceiveChar();
USART2_SendChar(c);
}
}
```
此代码使用 PA2 和 PA3 作为 USART2 的 TX 和 RX 引脚,波特率为 9600。USART2_SendChar 函数用于发送单个字符,USART2_SendString 函数用于发送字符串。USART2_ReceiveChar 函数用于接收单个字符。在主函数中,发送一个字符串后,进入一个死循环,不断接收一个字符并发送回去。
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