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_3.9.2.exe
网络调试工具:hercules_3-2-8.exe (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。
ESP8266 烧录 AT 指令集
这里使用的是 flash_download_tool.exe 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 ‘\r\n’。
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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
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首先配置 MM32F3277 UART:
#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;
#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;
}
void initGPIO_UART(UART_TypeDef *UARTx)
{
GPIO_InitTypeDef GPIO_InitStructure;
if(UARTx == UART1){
COMMON_EnableIpClock(emCLOCK_GPIOA);
GPIO_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);
GPIO_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);
GPIO_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);
GPIO_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);
}
}
void initUART(UART_TypeDef *UARTx, uint32_t baudrate)
{
UART_InitTypeDef UART_InitStructure;
if(UARTx == UART1){
COMMON_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){
COMMON_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);
}
}
void NVIC_UART(UART_TypeDef *UARTx)
{
NVIC_InitTypeDef NVIC_InitStructure;
if(UARTx == UART1){
NVIC_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){
NVIC_InitStructure.NVIC_IRQChannel = UART8_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
}
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;
}
}
}
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);
}
}
void UART_ClearRxBuffer()
{
memset(rxBuffer, 0, sizeof(rxBuffer));
stringStart = 1;
}
void BSP_UART_Configure()
{
initGPIO_UART(UART1);
initUART(UART1, 115200);
initGPIO_UART(UART8);
initUART(UART8, 115200);
NVIC_UART(UART8);
memset(rxBuffer, 0x00, sizeof(rxBuffer));
}
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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 \r\n ,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+RST\r\n ,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=1\r\n ,检查应答 OK - 连接 WiFi:
AT+CWJAP=\"WiFi_Name\",\"password\"\r\n ,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:
void ESP8266_UART_SendCmd(char *cmd)
{
UART_ClearRxBuffer();
char *wholeCmd = stringEndJoint(cmd);
UART_SendPackage(ESP8266_UART, (u8*)wholeCmd, strlen(wholeCmd));
}
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;
}
}
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;
}
}
char* stringJoint(char *cmd1, char *cmd2)
{
char *wholeCmd = (char *)malloc(strlen(cmd1) + strlen(cmd2) + 1);
sprintf(wholeCmd, "%s%s", cmd1, cmd2);
return wholeCmd;
}
char* stringCommaJoint(char *cmd)
{
char *sign = ",";
char *wholeCmd = stringJoint(sign, cmd);
return wholeCmd;
}
char* stringQutJoint(char *cmd)
{
char *sign = "\"";
char *wholeCmd = stringJoint(sign, stringJoint(cmd, sign));
return wholeCmd;
}
char* stringEndJoint(char *cmd)
{
char *sign = "\r\n";
char *wholeCmd = stringJoint(cmd, sign);
return wholeCmd;
}
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贴一张结果图,Congratulation! 是 MM32 发送给服务器的,123456 是服务器发送给 MM32 的
The End
踩着 4 月的尾巴写了一篇 CSDN,MQTT 的部分下周再说吧。
好害怕,我们还没能独当一面,还没来得及多陪陪长辈,没能给他们更好的生活,他们却已老去。
林阿公拜托一定一定要挺住,虽然现在很疼很累,但再坚持一下,我们都爱你,请再等等我们。
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