"Configuration function and transceiver data function code of 5 serial ports:
#include “stm32f10x.h”
#include “misc.h”
#include “stm32f10x_ gpio.h”
#include “stm32f10x_ usart.h”
void USART1_ Configuration（void）
{
GPIO_ InitTypeDef GPIO_ InitStructure;
USART_ InitTypeDef USART_ InitStructure;
NVIC_ InitTypeDef NVIC_ InitStructure;
RCC_ APB2PeriphClockCmd（RCC_ APB2Periph_ GPIOA， ENABLE ）;
RCC_ APB2PeriphClockCmd（RCC_ APB2Periph_ USART1， ENABLE ）;
GPIO_ InitStructure.GPIO_ Pin = GPIO_ Pin_ 9; // USART1 TX；
GPIO_ InitStructure.GPIO_ Mode = GPIO_ Mode_ AF_ PP; // Multiplex push-pull output;
GPIO_ InitStructure.GPIO_ Speed = GPIO_ Speed_ 50MHz;
GPIO_ Init（GPIOA， &GPIO_ InitStructure）; // Port a;
GPIO_ InitStructure.GPIO_ Pin = GPIO_ Pin_ 10; // USART1 RX；
GPIO_ InitStructure.GPIO_ Mode = GPIO_ Mode_ IN_ FLOATING; // Floating input;
GPIO_ Init（GPIOA， &GPIO_ InitStructure）; // Port a;
USART_ InitStructure.USART_ BaudRate = 9600; // Baud rate;
USART_ InitStructure.USART_ WordLength = USART_ WordLength_ 8b; // 8 data bits;
USART_ InitStructure.USART_ StopBits = USART_ StopBits_ 1; // Stop bit: 1 bit;
USART_ InitStructure.USART_ Parity = USART_ Parity_ No ; // No check bit;
USART_ InitStructure.USART_ HardwareFlowControl = USART_ HardwareFlowControl_ None;
//No hardware flow control;
USART_ InitStructure.USART_ Mode = USART_ Mode_ Rx | USART_ Mode_ Tx;
//Transceiver mode;
USART_ Init（USART1， &USART_ InitStructure）;// Configure serial port parameters;
NVIC_ PriorityGroupConfig（NVIC_ PriorityGroup_ 2）; // Set interrupt group, 4-bit preemption priority and 4-bit response priority;
NVIC_ InitStructure.NVIC_ IRQChannel = USART1_ IRQn; // Interrupt number;
NVIC_ InitStructure.NVIC_ IRQChannelPreemptionPriority = 0; // Preemptive priority;
NVIC_ InitStructure.NVIC_ IRQChannelSubPriority = 0; // Response priority;
NVIC_ InitStructure.NVIC_ IRQChannelCmd = ENABLE;
NVIC_ Init（&NVIC_ InitStructure）;
USART_ ITConfig（USART1， USART_ IT_ RXNE， ENABLE）;
USART_ Cmd（USART1， ENABLE）; // Enable serial port;
}
void USART1_ Send_ Byte (U8 data) / / send a byte;
{
USART_ SendData（USART1，Data）;
while（ USART_ GetFlagStatus（USART1， USART_ FLAG_ TC） == RESET ）;
}
void USART1_ Send_ String (U8 * data) / / send string;
{
while（*Data）
USART1_ Send_ Byte（*Data++）;
}
void USART1_ Irqhandler (void) / / interrupt processing function;
{
u8 res;
if（USART_ GetITStatus（USART1， USART_ IT_ Rxne) = = set) / / judge whether an interrupt occurs;
{
USART_ ClearFlag（USART1， USART_ IT_ RXNE）; // Clear the flag bit;
res=USART_ ReceiveData（USART1）; // Receiving data;
USART1_ Send_ Byte（res）; // User defined;
}
}
void USART2_ Configuration（void）
{
GPIO_ InitTypeDef GPIO_ InitStructure;
USART_ InitTypeDef USART_ InitStructure;
NVIC_ InitTypeDef NVIC_ InitStructure;
RCC_ APB2PeriphClockCmd（RCC_ APB2Periph_ GPIOA， ENABLE ）;
RCC_ APB1PeriphClockCmd（RCC_ APB1Periph_ USART2， ENABLE ）;
GPIO_ InitStructure.GPIO_ Pin = GPIO_ Pin_ 2; // USART2 TX；
GPIO_ InitStructure.GPIO_ Mode = GPIO_ Mode_ AF_ PP; // Multiplex push-pull output;
GPIO_ InitStructure.GPIO_ Speed = GPIO_ Speed_ 50MHz;
GPIO_ Init（GPIOA， &GPIO_ InitStructure）; // Port a;
GPIO_ InitStructure.GPIO_ Pin = GPIO_ Pin_ 3; // USART2 RX；
GPIO_ InitStructure.GPIO_ Mode = GPIO_ Mode_ IN_ FLOATING; // Floating input;
GPIO_ Init（GPIOA， &GPIO_ InitStructure）; // Port a;
USART_ InitStructure.USART_ BaudRate = 9600; // Baud rate;
USART_ InitStructure.USART_ WordLength = USART_ WordLength_ 8b; // 8 data bits;
USART_ InitStructure.USART_ StopBits = USART_ StopBits_ 1; // Stop bit: 1 bit;
USART_ InitStructure.USART_ Parity = USART_ Parity_ No ; // No check bit;
USART_ InitStructure.USART_ HardwareFlowControl = USART_ HardwareFlowControl_ None;
//No hardware flow control;
USART_ InitStructure.USART_ Mode = USART_ Mode_ Rx | USART_ Mode_ Tx;
//Transceiver mode;
USART_ Init（USART2， &USART_ InitStructure）;// Configure serial port parameters;
NVIC_ PriorityGroupConfig（NVIC_ PriorityGroup_ 2）; // Set interrupt group, 4-bit preemption priority and 4-bit response priority;
NVIC_ InitStructure.NVIC_ IRQChannel = USART2_ IRQn; // Interrupt number;
NVIC_ InitStructure.NVIC_ IRQChannelPreemptionPriority = 0; // Preemptive priority;
NVIC_ InitStructure.NVIC_ IRQChannelSubPriority = 0; // Response priority;
NVIC_ InitStructure.NVIC_ IRQChannelCmd = ENABLE;
NVIC_ Init（&NVIC_ InitStructure）;
USART_ ITConfig（USART2， USART_ IT_ RXNE， ENABLE）;
USART_ Cmd（USART2， ENABLE）; // Enable serial port;
}
void USART2_ Send_ Byte (U8 data) / / send a byte;
{
USART_ SendData（USART2，Data）;
while（ USART_ GetFlagStatus（USART2， USART_ FLAG_ TC） == RESET ）;
}
void USART2_ Send_ String (U8 * data) / / send string;
{
while（*Data）
USART2_ Send_ Byte（*Data++）;
}
void USART2_ Irqhandler (void) / / interrupt processing function;
{
u8 res;
if（USART_ GetITStatus（USART2， USART_ IT_ Rxne) = = set) / / judge whether an interrupt occurs;
{
USART_ ClearFlag（USART2， USART_ IT_ RXNE）; // Clear the flag bit;
res=USART_ ReceiveData（USART2）; // Receiving data;
USART2_ Send_ Byte（res）; // User defined;
}
}
void USART3_ Configuration（void）
{
GPIO_ InitTypeDef GPIO_ InitStructure;
USART_ InitTypeDef USART_ InitStructure;
NVIC_ InitTypeDef NVIC_ InitStructure;
RCC_ APB2PeriphClockCmd（RCC_ APB2Periph_ GPIOB， ENABLE ）;
RCC_ APB1PeriphClockCmd（RCC_ APB1Periph_ USART3， ENABLE ）;
GPIO_ InitStructure.GPIO_ Pin = GPIO_ Pin_ 10; // USART3 TX；
GPIO_ InitStructure.GPIO_ Mode = GPIO_ Mode_ AF_ PP; // Multiplex push-pull output;
GPIO_ InitStructure.GPIO_ Speed = GPIO_ Speed_ 50MHz;
GPIO_ Init（GPIOB， &GPIO_ InitStructure）; // Port B;
GPIO_ InitStructure.GPIO_ Pin = GPIO_ Pin_ 11; // USART3 RX；
GPIO_ InitStructure.GPIO_ Mode = GPIO_ Mode_ IN_ FLOATING; // Floating input;
GPIO_ Init（GPIOB， &GPIO_ InitStructure）; // Port B;
USART_ InitStructure.USART_ BaudRate = 9600; // Baud rate;
USART_ InitSt
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