MM32F3277 + ESP8266 使用指南（1. 实现 TCP Client 透传）

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主控芯片：MM32F2377 (MB-039)

WiFi 适配器：ESP8266

开发环境：IAR 7.80.4

调试助手：ESP8266 调试工具V2.2

ESP8266 AT 指令烧录工具：flash_download_tool_3.

网络调试工具： (TCP)

从上周开始使用 ESP8266，磕磕绊绊终于实现了 TCP 和 MQTT 的通讯。

ESP8266 简介

ESP8266 由乐鑫公司开发，提供了一套高度集成的 Wi-Fi SoC 解决方案。

通讯接口：UART
用户配置：AT 指令集
工作模式：
1. Station：作为客户端连接路由器
2. AP：ESP8266 自身作为热点供用户连接
3. Station + AP：即能作为热点也能作为终端设备
AT 指令：
1. AT 指令下载：乐鑫官方 AT 下载地址 / Ai-thinker AT 下载地址
2. 指令详情可见 ESP-AT 用户指南
烧录工具：ESP8266Flasher 或者 flash_download_tool

ESP8266 烧录 AT 指令集

这里使用的是 flash_ 工具，AT 包用的是乐鑫官方提供的 v2.2.1.0 ESP8266-IDF-AT_V2.2.1.0.zip

选择 factory_WROOM-02.bin ，地址选择 0x00

勾选正确后，点击 START，这里需要你按一下 RST 键，或将 RST 接口重新上电复位，之后就会开始烧录了。

ESP8266 连接 USB 转 TTL

烧录完 AT 指令后，先将 ESP8266 连接 USB 转 TTL 设备试一下，我这里用的是 YS-CH340，连接方式如下：

这里使用的调试工具是 ESP8266调试工具V2.2，一开始用的是山外多功能调试助手，发送 AT 指令没有应答，后来发现山外多功能调试助手的回车只发送’n’，不发送’r’，而 AT 指令需要 ‘rn’。

首先测试 AT 指令：发送 AT，应答 OK
配置 Station 模式：发送 AT+CWMODE=1，应答 OK

查询当前模式：AT+CWMODE?，应答 +CWMODE:1
连接 WiFi：发送 AT+CWJAP="xxx","xxx"，第一个参数是热点名，第二个参数是密码，连接成功应答 WIFI CONNECTED WIFI GOT IP OK

还可以扫描当前可用的 WiFi：AT+CWLAP，应答 +CWLAP:<ecn>,<ssid>,<rssi>,<mac>,<channel>,<freq_offset>,<freqcal_val>,<pairwise_cipher>,<group_cipher>,<bgn>,<wps> OK

也可以获取 ESP8266 当前 IP 地址和 MAC 地址：AT+CIFSR，应答 +CIFSR:STAIP,"10.3.1.120" +CIFSR:STAMAC,"98:cd:ac:0b:cd:45" OK

MM32 连接 ESP8266 实现 TCP 传输

接下来我们就把 ESP8266 连接到主控 MM32F3277 上，这里连接的是 UART8

首先配置 MM32F3277 UART：

UART1: 用于 printf 打印错误报告
UART8: 用于 MM32 和 ESP8266 进行通讯


#define _UART_C_

#include <string.h>
#include <stdio.h>	
#include "mm32_types.h"#include "common.h"
#include "uart.h"#include "hal_uart.h"
#include "hal_gpio.h"
#include "hal_nvic.h"#define BUFFERSIZE  516
GLOBAL char rxBuffer[BUFFERSIZE];
GLOBAL bool stringStart;
/// @brief  printf redirection function.
/// @param  ch: One character.
/// @param  f: File pointer.
/// @retval int32_t: One character.

#ifdef __GNUC__
#    define PUTCHAR_PROTOTYPE int32_t __io_putchar(int32_t ch)
#else
#    define PUTCHAR_PROTOTYPE int32_t fputc(int32_t ch, FILE * f)
#endif
PUTCHAR_PROTOTYPE
{UART_SendData(UART1, (uint8_t)ch);while (UART_GetFlagStatus(UART1, UART_CSR_TXC) == RESET);return ch;
}
/// @brief  UART GPIO Configuration.
/// @param  UARTx: Select the UART or the UART peripheral.
/// @retval None.

void initGPIO_UART(UART_TypeDef *UARTx)
{GPIO_InitTypeDef GPIO_InitStructure;if(UARTx == UART1){COMMON_EnableIpClock(emCLOCK_GPIOA);// UART1_TX   GPIOA.9GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;GPIO_Init(GPIOA, &GPIO_InitStructure);GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_7);// UART1_RX   GPIOA.10GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;GPIO_Init(GPIOA, &GPIO_InitStructure);GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_7);}else if(UARTx == UART8){COMMON_EnableIpClock(emCLOCK_GPIOE);// UART8_TX   GPIOE.1GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;GPIO_Init(GPIOE, &GPIO_InitStructure);GPIO_PinAFConfig(GPIOE, GPIO_PinSource1, GPIO_AF_8);// UART8_RX   GPIOE.0GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;GPIO_Init(GPIOE, &GPIO_InitStructure);GPIO_PinAFConfig(GPIOE, GPIO_PinSource0, GPIO_AF_8);}
}
/// @brief  Initializes the UARTx peripheral according to the specified
///         parameters in the UART_InitStruct.
/// @param  UARTx: Select the UART or the UART peripheral.
/// @param  baudrate: UART communication baudrate.
/// @retval None.

void initUART(UART_TypeDef *UARTx, uint32_t baudrate)
{UART_InitTypeDef UART_InitStructure;if(UARTx == UART1){// Init UART1COMMON_EnableIpClock(emCLOCK_UART1);UART_InitStructure.BaudRate      = baudrate;UART_InitStructure.WordLength    = UART_WordLength_8b;UART_InitStructure.StopBits      = UART_StopBits_1;UART_InitStructure.Parity        = UART_Parity_No;UART_InitStructure.Mode          = UART_GCR_RX | UART_GCR_TX;UART_InitStructure.HWFlowControl = UART_HWFlowControl_None;UART_Init(UART1, &UART_InitStructure);UART_ITConfig(UART1, UART_IER_RX, ENABLE);UART_Cmd(UART1, ENABLE);}else if(UARTx == UART8){// Init UART8COMMON_EnableIpClock(emCLOCK_UART8);UART_InitStructure.BaudRate      = baudrate;UART_InitStructure.WordLength    = UART_WordLength_8b;UART_InitStructure.StopBits      = UART_StopBits_1;UART_InitStructure.Parity        = UART_Parity_No;UART_InitStructure.Mode          = UART_GCR_RX | UART_GCR_TX;UART_InitStructure.HWFlowControl = UART_HWFlowControl_None;UART_Init(UART8, &UART_InitStructure);UART_ITConfig(UART8, UART_IER_RX, ENABLE);UART_Cmd(UART8, ENABLE);}
}
/// @brief  Configure UART NVIC.
/// @param  UARTx: Select the UART or the UART peripheral.
/// @retval None.

void NVIC_UART(UART_TypeDef *UARTx)
{NVIC_InitTypeDef NVIC_InitStructure;if(UARTx == UART1){// UART1 NVICNVIC_InitStructure.NVIC_IRQChannel = UART1_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStructure);}else if(UARTx == UART8){// UART8 NVICNVIC_InitStructure.NVIC_IRQChannel = UART8_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStructure);}
}
/// @brief  UART8 Receive data by interrupt.
/// @param  None.
/// @retval None.

void UART8_IRQHandler(void)
{if(UART_GetITStatus(UART8, UART_ISR_RX) != RESET) {UART_ClearITPendingBit(UART8, UART_ISR_RX);static u16 rCnt = 0;if(stringStart){rCnt = 0;stringStart = 0;}*(rxBuffer + rCnt) = UART_ReceiveData(UART8);rCnt++;if (rCnt >= BUFFERSIZE){rCnt = 0;}}
}
/// @brief  UART send package data.
/// @param  UARTx: Select the UART or the UART peripheral.
/// @param  ptr: Data sent by UART.
/// @param  len: Length of data.
/// @retval None.

void UART_SendPackage(UART_TypeDef *UARTx, u8* ptr, u16 len)
{while(len--){UART_SendData(UARTx, *(u16*)ptr);ptr++;while (UART_GetFlagStatus(UARTx, UART_CSR_TXC) == RESET);}
}
/// @brief  Clear Rx Buffer.
/// @param  None.
/// @retval None.

void UART_ClearRxBuffer()
{memset(rxBuffer, 0, sizeof(rxBuffer));stringStart = 1;
}
/// @brief  Initialize UART on board MB-039.
/// @param  None.
/// @retval None.

void BSP_UART_Configure()
{initGPIO_UART(UART1);initUART(UART1, 115200);initGPIO_UART(UART8);initUART(UART8, 115200);NVIC_UART(UART8);memset(rxBuffer, 0x00, sizeof(rxBuffer));
}

配置网络调试助手，模拟 TCP Server，这里用的是 hercules，不知道为什么我电脑上山外的网络调试助手不大行

点击 Listen，开始监听

通过 MM32F3277 发送相应的 AT 指令给 ESP8266，连接 WiFi，连接 TCP

AT 指令的顺序是：

退出透传：+++ 不要 rn，只要三个 +，这一步是防止设备处于透传模式，会讲 AT 指令当做数据进行发送
重启复位：AT+RSTrn，检查应答 OK，如果之前连接过 WiFi，这一步之后会自动连接 WiFi
配置 Station 模式：AT+CWMODE=1rn，检查应答 OK
连接 WiFi：AT+CWJAP="WiFi_Name","password"rn，检查应答 OK，注意这里的引号需要添加转义符
连接 TCP：AT+CIPSTART="TCP","IP_Address",Port_Num，检查应答 OK
配置透传模式：AT+CIPMODE=1，检查应答 OK
开始发送数据：AT+CIPSEND，检查应答 >
就可以和 TCP 收发数据啦

下面是指令发送的几个函数：


/// @brief  Send commands to ESP8266 by UART.
/// @param  cmd: Commands sent to ESP8266.
/// @retval None.

void ESP8266_UART_SendCmd(char *cmd)
{UART_ClearRxBuffer();char *wholeCmd = stringEndJoint(cmd);UART_SendPackage(ESP8266_UART, (u8*)wholeCmd, strlen(wholeCmd));
}
/// @brief  Send AT commands to ESP8266 and check ack.
/// @param  cmd: Commands sent to ESP8266.
/// @param  ack: Ack from ESP8266 after receiving AT commands.
/// @param  longestWaitTime: Longest time waitting for right ack.
/// @retval ESP8266 OK or ERROR.

ESP8266_Error_Typedef ESP8266_Send_AT_Command(char *cmd, char *ack, u32 longestWaitTime)
{u32 timeOut = 0;ESP8266_UART_SendCmd(cmd);while(strstr(rxBuffer, ack) == NULL){timeOut++;if(timeOut == longestWaitTime) break;}if(timeOut < longestWaitTime){printf("Send AT Command:%s   Get Ack:%s n", cmd, ack);return ESP8266_OK;}else{printf("Send AT Command:%s   No Right Ack:%s n", cmd, ack);return ESP8266_ERROR;}
}
/// @brief  Sending AT commands to ESP8266 for maxTimes.
/// @param  cmd: Commands sent to ESP8266.
/// @param  ack: Ack from ESP8266 after receiving AT commands.
/// @param  longestWaitTime: Longest time waitting for right ack.
/// @param  maxTimes: Send commands for times. Return ERROR if no right ack.
/// @retval ESP8266 OK or ERROR.

ESP8266_Error_Typedef ESP8266_Send_AT_Command_Times(char *cmd, char *ack, u32 longestWaitTime, u8 maxTimes)
{u8 times = 0;while(ESP8266_Send_AT_Command(cmd, ack, longestWaitTime)){if(++times >= maxTimes) break;}if(times < maxTimes){return ESP8266_OK;}else{return ESP8266_ERROR;}
}
/// @brief  Joint string cmd1 and cmd2.
/// @param  cmd1: First string.
/// @param  cmd2: Second string.
/// @retval The result string.

char* stringJoint(char *cmd1, char *cmd2)
{char *wholeCmd = (char *)malloc(strlen(cmd1) + strlen(cmd2) + 1);sprintf(wholeCmd, "%s%s", cmd1, cmd2);return wholeCmd;
}
/// @brief  Joint string cmd and comma.
/// @param  cmd: First string.
/// @retval The result string.

char* stringCommaJoint(char *cmd)
{char *sign = ",";char *wholeCmd = stringJoint(sign, cmd);return wholeCmd;
}
/// @brief  Joint string cmd and quotation.
/// @param  cmd: First string.
/// @retval The result string.

char* stringQutJoint(char *cmd)
{char *sign = """;char *wholeCmd = stringJoint(sign, stringJoint(cmd, sign));return wholeCmd;
}
/// @brief  Joint string cmd and rn.
/// @param  cmd: First string.
/// @retval The result string.

char* stringEndJoint(char *cmd)
{char *sign = "rn";char *wholeCmd = stringJoint(cmd, sign);return wholeCmd;
}