STM32单片机ESP8266发送数据到WiFi接收端代码实现

ESP8266支持的一些指令看我另一篇博文：http://blog.csdn.net/qq_17242837/article/details/53931712

首先需要配置STM32的串口发送和接收，在本文中基于原子和网上的一些程序修改，使用DMA传输，减少CPU占用，下面列出所有代码。

注：发送使用的是UDP传输，在我自己的设计中是能正确执行的，程序中的头文件自己编译的时候需要什么自己添加吧，有"usart.h"和"stm32f10x_usart.h"，串口1配置了C语言重定向，可以使用printf发送数据，我用于调试，串口2用于与其他器件通讯。

ESP8266程序

头文件：

#ifndef __ESP8266_H#define__ESP8266_H#include "headers.h"void init_esp8266(void);u8* ESP8266_send(char* cmd);#endif /* __ESP8266_H */

C程序：

#include "esp8266.h"extern u16 USART2_RX_Size;extern u8 USART2_RX_FLAG;extern u8 USART2_RX_BUF[USART_REC_LEN];char* CWMODE = "AT+CWMODE=2\r\n";char* CIPMUX = "AT+CIPMUX=1\r\n";/** AT+ CWSAP=<ssid>,<pwd>,<chl>, <ecn>*ssid：WiFi热点名称* pwd： WiFi热点连接密码*chl： 通道* ecn： 加密方式，0-OPEN,1-WEP,2-WPA_PSK,3-WPA2_PSK,4-WPA_WPA2_PSK*/char* CWSAP  = "AT+CWSAP=\"WIFI\",\"12345678\",1,0\r\n";char* CIPSERVER  = "AT+CIPSERVER=1,8080\r\n";char* CIPSTART   = "AT+CIPSTART=1,\"UDP\",\"192.168.4.2\",8080\r\n";char  CIPSEND[50]= "AT+CIPSEND=1,12\r\n";char* CIPSTATUS  = "AT+CIPSTATUS\r\n";char* CIPCLOSE   = "AT+CIPCLOSE\r\n";u8 len(char str[]){u8 i = 0;while(str[i++]);return --i;}/** 判断src字符串中是否包含str字符串* input：截取部分，需要判断部分* return: 不包含返回0，包含返回1*/char haveString(char* str, char* src){u16 i;u16 j;u16 length = len(str);for(i = 0; i < len(src); i++){if(src[i] == str[0]){for(j = 1; j < length; j++)if(src[++i] != str[j])break;}if(length == j)break;    else      j = 0;}if(length == j)return 1;elsereturn 0;}/** brief: 发送指令，直到串口接收到响应返回* input: AT+CMD，指令内容* @note  在操作系统支持下，可以等待串口接收数据事件返回*/void write(char* str){SendMulData(str, len(str));while(!USART2_RX_FLAG);USART2_RX_FLAG = 0;}/** brief: 初始化ESP8266* in：    无* retval：无*/void init_esp8266(void){printf("----------start esp init-----------\n");USART2_RX_FLAG = 0;write(CWMODE);write(CIPMUX);write(CWSAP);write(CIPSERVER);write(CIPSTART);ESP8266_send("ESP start.\r\n");}/** brief：发送数据到服务器或上位机* in：   需发送数据* retval：串口接收到的数据*/u8* ESP8266_send(char* cmd){u8 wait = 10;sprintf(CIPSEND, "AT+CIPSEND=1,%d\r\n", len(cmd)-2);write(CIPSEND);while(!haveString(">", (char*)USART2_RX_BUF) && wait--) Delay_ms(1);SendMulData(cmd, len(cmd));return USART2_RX_BUF;}

串口程序

头文件：

#ifndef __USART_H#define__USART_H#include "headers.h"#define USART_REC_LEN  256 //定义最大接收字节数 8void USART_Config(uint32_t baud,uint32_t uart_num);void SendMulData(char *data, u16 size);#endif /* __USART1_H */

C程序：

/*************************************** * 文件名  ：usart1.c * 描述    ：配置USART1          * 实验平台：MINI STM32开发板 基于STM32F103C8T6 * 硬件连接：------------------------ *          | PA9  - USART1(Tx)      | *          | PA10 - USART1(Rx)      | *           ------------------------ * 库版本  ：ST3.0.0  **********************************************************************************/#include "usart.h"#include <stdarg.h>#include "misc.h"u8 USART1_RX_FLAG = 0;u8 USART2_RX_FLAG = 0;u16 USART1_RX_Size = 0;u16 USART2_RX_Size = 0;u8 USART1_RX_BUF[USART_REC_LEN];u8 USART2_RX_BUF[USART_REC_LEN];     //接收缓冲,最大USART_REC_LEN个字节.int fputc(int ch, FILE *f){USART_SendData(USART1, (unsigned char) ch);while (!(USART1->SR & USART_FLAG_TXE));return (ch);}void USART_Config(uint32_t baud,uint32_t uart_num){GPIO_InitTypeDef GPIO_InitStructure;USART_InitTypeDef USART_InitStructure;DMA_InitTypeDef   DMA_InitStructure;NVIC_InitTypeDef  NVIC_InitStructure;/* config USART1 clock */RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);//RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);if( uart_num == 1){RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);/* USART1 GPIO config *//* Configure USART1 Tx (PA.09) as alternate function push-pull */GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA, &GPIO_InitStructure);    /* Configure USART1 Rx (PA.10) as mn floating */GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;GPIO_Init(GPIOA, &GPIO_InitStructure);}else{RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);/* USART1 GPIO config *//* Configure USART1 Tx (PA.2) as alternate function push-pull */GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA, &GPIO_InitStructure);    /* Configure USART1 Rx (PA.3) as mn floating */GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;GPIO_Init(GPIOA, &GPIO_InitStructure);}/* USART1 mode config */USART_InitStructure.USART_BaudRate = baud;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;if( uart_num == 1 ){// UART1 interruptUSART_ITConfig(USART1,USART_IT_TC,DISABLE);USART_ITConfig(USART1,USART_IT_RXNE,DISABLE);USART_ITConfig(USART1,USART_IT_IDLE,ENABLE); NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;  USART_Init(USART1, &USART_InitStructure); DMA_DeInit(DMA1_Channel5);DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&USART1->DR);DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)USART1_RX_BUF;}else{// UART2 interruptUSART_ITConfig(USART2,USART_IT_TC,DISABLE);USART_ITConfig(USART2,USART_IT_RXNE,DISABLE);USART_ITConfig(USART2,USART_IT_IDLE,ENABLE); NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;  USART_Init(USART2, &USART_InitStructure); DMA_DeInit(DMA1_Channel6);DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&USART2->DR);DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)USART2_RX_BUF;}DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;DMA_InitStructure.DMA_BufferSize = USART_REC_LEN;//100DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//  内存自增DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;//8位DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;//8位DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;if( uart_num == 1 ){DMA_Init(DMA1_Channel5, &DMA_InitStructure);DMA_Cmd(DMA1_Channel5, ENABLE);USART_DMACmd(USART1,USART_DMAReq_Rx,ENABLE);USART_Cmd(USART1, ENABLE); }else{DMA_Init(DMA1_Channel6, &DMA_InitStructure);DMA_Cmd(DMA1_Channel6, ENABLE);USART_DMACmd(USART2,USART_DMAReq_Rx,ENABLE);USART_Cmd(USART2, ENABLE); }       NVIC_PriorityGroupConfig(NVIC_PriorityGroup_3);            NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;       NVIC_Init(&NVIC_InitStructure); }void uart1_Rstart_dma(void){static uint16_t last_size1 = 0;uint16_t x;DMA1_Channel5->CCR &= (uint16_t)(~DMA_CCR1_EN);//close dmaDMA1_Channel5->CMAR = (uint32_t)USART1_RX_BUF;DMA1_Channel5->CNDTR = USART_REC_LEN;for( x = USART1_RX_Size; x < last_size1; x++){USART1_RX_BUF[x] = 0;}last_size1 = USART1_RX_Size;DMA1_Channel5->CCR |= DMA_CCR1_EN;// enable}// usart1 interrupt handle    void USART1_IRQHandler(void)                                 {  uint32_t temp = 0;if(USART_GetITStatus(USART1, USART_IT_IDLE) != RESET)  { // 相当于USART_ClearFlag(USART1,USART_IT_IDLE); (函数无效，需软件读取清)       temp = USART1->SR;        temp = USART1->DR;USART1_RX_FLAG = 1;      USART1_RX_Size = USART_REC_LEN - DMA_GetCurrDataCounter(DMA1_Channel5);    #ifdef debugSendMulData((char*)USART1_RX_BUF, USART1_RX_Size);#endif      // DMA reset        uart1_Rstart_dma(); } __nop();} void uart2_Rstart_dma(void){static uint16_t last_size2 = 0;uint16_t x;DMA1_Channel6->CCR &= (uint16_t)(~DMA_CCR1_EN);//close dmaDMA1_Channel6->CMAR = (uint32_t)USART2_RX_BUF;DMA1_Channel6->CNDTR = USART_REC_LEN;for( x = USART2_RX_Size; x < last_size2; x++){USART2_RX_BUF[x] = 0;}last_size2 = USART2_RX_Size;DMA1_Channel6->CCR |= DMA_CCR1_EN;// enable}// usart1 interrupt handle    void USART2_IRQHandler(void)                                 {  uint32_t temp = 0;if(USART_GetITStatus(USART2, USART_IT_IDLE) != RESET)  { #ifdef debugprintf("\n%s\n", USART2_RX_BUF);#endif// 相当于USART_ClearFlag(USART1,USART_IT_IDLE); (函数无效，需软件读取清)       temp = USART2->SR;        temp = USART2->DR;USART2_RX_FLAG = 1;      USART2_RX_Size = USART_REC_LEN - DMA_GetCurrDataCounter(DMA1_Channel6);          // DMA reset        uart2_Rstart_dma(); } __nop();} void SendMulData(char *data, u16 size)//最多发送USART_SEND_LEN字节{int i=0;for(; i < size; i++){USART_SendData(USART2,data[i]);while( !USART_GetFlagStatus(USART2, USART_FLAG_TXE) );}}