包头包尾与数据载荷可能出现重复
对此,我们应该尽量使用固定长度的数据包;其次,我们可以选择增加包头包尾的数量,让包头包尾不与数据载荷相同
每收到一个字节,函数就会进入一次中断,在中断函数中,可以取出这个字节;通过设置标志位来区分接受的数据包处于包头、数据、还是包尾状态
与发送HEX数据包基本类似,就数据内容变成文本型(每个字节就经过一层编码和译码,最终表现出文本格式)
如:发送100,hex直接发送一个字节100,而文本发送三个字节’1’,‘0’.‘0’,收到之后还要把字符转换程数据,才能得到100。
serial.c
#include "stm32f10x.h" // Device header
#include
#include
uint8_t Serial_TxPacket[4]; //FF 01 02 03 04 FE(发送包)
uint8_t Serial_RxPacket[4]; //接收包
uint8_t Serial_RxFlag; //接收标志位
void Serial_Init(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_InitTypeDef USART_InitStructure;
USART_InitStructure.USART_BaudRate = 9600;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_Init(USART1, &USART_InitStructure);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_Init(&NVIC_InitStructure);
USART_Cmd(USART1, ENABLE);
}
void Serial_SendByte(uint8_t Byte)
{
USART_SendData(USART1, Byte);
while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
}
void Serial_SendArray(uint8_t *Array, uint16_t Length)
{
uint16_t i;
for (i = 0; i < Length; i ++)
{
Serial_SendByte(Array[i]);
}
}
void Serial_SendString(char *String)
{
uint8_t i;
for (i = 0; String[i] != '\0'; i ++)
{
Serial_SendByte(String[i]);
}
}
uint32_t Serial_Pow(uint32_t X, uint32_t Y)
{
uint32_t Result = 1;
while (Y --)
{
Result *= X;
}
return Result;
}
void Serial_SendNumber(uint32_t Number, uint8_t Length)
{
uint8_t i;
for (i = 0; i < Length; i ++)
{
Serial_SendByte(Number / Serial_Pow(10, Length - i - 1) % 10 + '0');
}
}
int fputc(int ch, FILE *f)
{
Serial_SendByte(ch);
return ch;
}
void Serial_Printf(char *format, ...)
{
char String[100];
va_list arg;
va_start(arg, format);
vsprintf(String, format, arg);
va_end(arg);
Serial_SendString(String);
}
void Serial_SendPacket(void) //发送函数
{
Serial_SendByte(0xFF); //发送包头
Serial_SendArray(Serial_TxPacket, 4); //发送数据(相当于数组)
Serial_SendByte(0xFE); //发送包尾
}
uint8_t Serial_GetRxFlag(void) //获取数据接收标志位
{
if (Serial_RxFlag == 1)
{
Serial_RxFlag = 0;
return 1;
}
return 0;
}
void USART1_IRQHandler(void) //数据接收中断函数
{
static uint8_t RxState = 0; //数据状态标志位
static uint8_t pRxPacket = 0; //数据存储位置
if (USART_GetITStatus(USART1, USART_IT_RXNE) == SET)
{
uint8_t RxData = USART_ReceiveData(USART1);
if (RxState == 0) //状态为0,即接收包头
{
if (RxData == 0xFF)
{
RxState = 1;
pRxPacket = 0;
}
}
else if (RxState == 1) //状态为1,即接收数据
{
Serial_RxPacket[pRxPacket] = RxData;
pRxPacket ++;
if (pRxPacket >= 4)
{
RxState = 2;
}
}
else if (RxState == 2) /状态为2,即接收包尾
{
if (RxData == 0xFE)
{
RxState = 0;
Serial_RxFlag = 1;
}
}
USART_ClearITPendingBit(USART1, USART_IT_RXNE); //手动清除标志位
}
}
serial.h
#ifndef __SERIAL_H
#define __SERIAL_H
#include
extern uint8_t Serial_TxPacket[]; //主函数可调用
extern uint8_t Serial_RxPacket[]; //主函数可调用
void Serial_Init(void);
void Serial_SendByte(uint8_t Byte);
void Serial_SendArray(uint8_t *Array, uint16_t Length);
void Serial_SendString(char *String);
void Serial_SendNumber(uint32_t Number, uint8_t Length);
void Serial_Printf(char *format, ...);
void Serial_SendPacket(void);
uint8_t Serial_GetRxFlag(void);
#endif
main.c
#include "stm32f10x.h" // Device header
#include "Delay.h"
#include "OLED.h"
#include "Serial.h"
#include "Key.h"
uint8_t KeyNum;
int main(void)
{
OLED_Init();
Key_Init();
Serial_Init();
OLED_ShowString(1, 1, "TxPacket");
OLED_ShowString(3, 1, "RxPacket");
Serial_TxPacket[0] = 0x01;
Serial_TxPacket[1] = 0x02;
Serial_TxPacket[2] = 0x03;
Serial_TxPacket[3] = 0x04;
while (1)
{
KeyNum = Key_GetNum(); //添加按键模块,按键按下一次,数据加一
if (KeyNum == 1)
{
Serial_TxPacket[0] ++;
Serial_TxPacket[1] ++;
Serial_TxPacket[2] ++;
Serial_TxPacket[3] ++;
Serial_SendPacket();
OLED_ShowHexNum(2, 1, Serial_TxPacket[0], 2);
OLED_ShowHexNum(2, 4, Serial_TxPacket[1], 2);
OLED_ShowHexNum(2, 7, Serial_TxPacket[2], 2);
OLED_ShowHexNum(2, 10, Serial_TxPacket[3], 2);
}
if (Serial_GetRxFlag() == 1) //接收到数据
{
OLED_ShowHexNum(4, 1, Serial_RxPacket[0], 2);
OLED_ShowHexNum(4, 4, Serial_RxPacket[1], 2);
OLED_ShowHexNum(4, 7, Serial_RxPacket[2], 2);
OLED_ShowHexNum(4, 10, Serial_RxPacket[3], 2);
}
}
}
serial.c
#include "stm32f10x.h" // Device header
#include
#include
char Serial_RxPacket[100]; //"@ \r\n"
uint8_t Serial_RxFlag; //接收标志位
void Serial_Init(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_InitTypeDef USART_InitStructure;
USART_InitStructure.USART_BaudRate = 9600;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_Init(USART1, &USART_InitStructure);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_Init(&NVIC_InitStructure);
USART_Cmd(USART1, ENABLE);
}
void Serial_SendByte(uint8_t Byte)
{
USART_SendData(USART1, Byte);
while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
}
void Serial_SendArray(uint8_t *Array, uint16_t Length)
{
uint16_t i;
for (i = 0; i < Length; i ++)
{
Serial_SendByte(Array[i]);
}
}
void Serial_SendString(char *String)
{
uint8_t i;
for (i = 0; String[i] != '\0'; i ++)
{
Serial_SendByte(String[i]);
}
}
uint32_t Serial_Pow(uint32_t X, uint32_t Y)
{
uint32_t Result = 1;
while (Y --)
{
Result *= X;
}
return Result;
}
void Serial_SendNumber(uint32_t Number, uint8_t Length)
{
uint8_t i;
for (i = 0; i < Length; i ++)
{
Serial_SendByte(Number / Serial_Pow(10, Length - i - 1) % 10 + '0');
}
}
int fputc(int ch, FILE *f)
{
Serial_SendByte(ch);
return ch;
}
void Serial_Printf(char *format, ...)
{
char String[100];
va_list arg;
va_start(arg, format);
vsprintf(String, format, arg);
va_end(arg);
Serial_SendString(String);
}
void USART1_IRQHandler(void) //主要是中断函数的修改
{
static uint8_t RxState = 0; //静态变量只能在本函数使用
static uint8_t pRxPacket = 0;
if (USART_GetITStatus(USART1, USART_IT_RXNE) == SET)
{
uint8_t RxData = USART_ReceiveData(USART1);
if (RxState == 0)
{
if (RxData == '@' && Serial_RxFlag == 0)
{
RxState = 1;
pRxPacket = 0;
}
}
else if (RxState == 1)
{
if (RxData == '\r')
{
RxState = 2;
}
else
{
Serial_RxPacket[pRxPacket] = RxData;
pRxPacket ++;
}
}
else if (RxState == 2)
{
if (RxData == '\n')
{
RxState = 0;
Serial_RxPacket[pRxPacket] = '\0';
Serial_RxFlag = 1;
}
}
USART_ClearITPendingBit(USART1, USART_IT_RXNE);
}
}
main.c
#include "stm32f10x.h" // Device header
#include "Delay.h"
#include "OLED.h"
#include "Serial.h"
#include "LED.h"
#include "string.h" //strcmp函数的应用
int main(void)
{
OLED_Init();
LED_Init();
Serial_Init();
OLED_ShowString(1, 1, "TxPacket");
OLED_ShowString(3, 1, "RxPacket");
while (1)
{
if (Serial_RxFlag == 1)
{
OLED_ShowString(4, 1, " ");
OLED_ShowString(4, 1, Serial_RxPacket);
if (strcmp(Serial_RxPacket, "LED_ON") == 0)
{
LED1_ON();
Serial_SendString("LED_ON_OK\r\n");
OLED_ShowString(2, 1, " ");
OLED_ShowString(2, 1, "LED_ON_OK");
}
else if (strcmp(Serial_RxPacket, "LED_OFF") == 0)
{
LED1_OFF();
Serial_SendString("LED_OFF_OK\r\n");
OLED_ShowString(2, 1, " ");
OLED_ShowString(2, 1, "LED_OFF_OK");
}
else
{
Serial_SendString("ERROR_COMMAND\r\n");
OLED_ShowString(2, 1, " ");
OLED_ShowString(2, 1, "ERROR_COMMAND");
}
Serial_RxFlag = 0;
}
}
}