【GD32F427开发板试用】USR-C210 WIFI模块进行以太网通信

本篇文章来自极术社区与兆易创新组织的GD32F427开发板评测活动，更多开发板试用活动请关注极术社区网站。作者：小蜗牛

一、硬件介绍

USR-C210 硬件上集成了 MAC、基频芯片、射频收发单元，尺寸小，易于焊接在客户的单板电路上，且模块可选择内置或外置天线的应用，方便客户多重选择，模块内置低功耗运行机制，可以有效实现模块的低功耗运行。

GD32F427系列高性能MCU产品系列提供了丰富的外设和大存储容量，可广泛应用于高级计算，云服务器，人工智能、工业控制、电机变频、图形显示、安防监控、传感器网络、无人机、机器人、物联网等创新领域。

二、硬件连接

从图中可以看到，只需将GD32F427开发板上的3.3V供给模块，然后UART口与WIFI模块连接，最后再使用一个GPIO作为WIFI模块的重启和复位控制，即可实现该模块完整控制。

三、程序初始化

本文使用USART3与WIFI模块进行连接，因此将对该部分进行初始化。
`void USART3_GpioInit(void)
{

/* enable GPIO clock */
rcu_periph_clock_enable(BSP_USART3_GPIO_RCU);/* configure the USART0 TX pin and USART0 RX pin */
gpio_af_set(BSP_USART3_TX_PORT, GPIO_AF_7, BSP_USART3_TX_PIN);
gpio_af_set(BSP_USART3_RX_PORT, GPIO_AF_7, BSP_USART3_RX_PIN);/* configure USART0 TX as alternate function push-pull */
gpio_mode_set(BSP_USART3_TX_PORT, GPIO_MODE_AF, GPIO_PUPD_PULLUP, BSP_USART3_TX_PIN);
gpio_output_options_set(BSP_USART3_TX_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, BSP_USART3_TX_PIN);/* configure USART0 RX as alternate function push-pull */
gpio_mode_set(BSP_USART3_RX_PORT, GPIO_MODE_AF, GPIO_PUPD_PULLUP, BSP_USART3_RX_PIN);
gpio_output_options_set(BSP_USART3_RX_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, BSP_USART3_RX_PIN);

} 串口波特率配置函数： void USART3_BoudRateConfig(uint32_t boud)
{

/* enable USART clock */
rcu_periph_clock_enable(BSP_USART3_RCU);/* USART configure */
usart_deinit(BSP_USART3_USART);
usart_baudrate_set(BSP_USART3_USART, boud);
usart_receive_config(BSP_USART3_USART, USART_RECEIVE_ENABLE);
usart_transmit_config(BSP_USART3_USART, USART_TRANSMIT_ENABLE);
usart_enable(BSP_USART3_USART);

} Wifi模块初始化 void USRC210_Init(void)
{

uint8_t strBuf[200];
uint8_t i,status;while(1)
{i=0;status=1;//1. Reset the UsrC210Wifi_Reset();//2.1 Send +++ Wake UsrC210if(UsrC210SendCmd("+++")!=3){continue;}//2.2 Send a Wake UsrC210 Into CMD Modeif(UsrC210SendCmd("a")!=1){continue;}//3. Set WIFI Modewhile(UsrC210SendCmd("AT+WMODE=APSTA\r\n")!=1){if(i++>CmdRepeatCount){status=0;break;}}if(!status)continue;//4. Set STA i=0;sprintf((char*)strBuf,"AT+WSTA=%s\r\n",STAMSG);while(UsrC210SendCmd((char*)strBuf)!=1){if(i++>CmdRepeatCount){status=0;break;}}if(!status)continue;//5. Set APi=0;sprintf((char*)strBuf,"AT+WAP=%s\r\n",APMSG);while(UsrC210SendCmd((char*)strBuf)!=1){if(i++>CmdRepeatCount){status=0;break;}}if(!status)continue;//6. Set WEB LOGINi=0;sprintf((char*)strBuf,"AT+WEBU=%s\r\n",LOGINMSG);while(UsrC210SendCmd((char*)strBuf)!=1){if(i++>CmdRepeatCount){status=0;break;}}if(!status)continue;//7. Set MIDi=0;sprintf((char*)strBuf,"AT+MID=%s\r\n",MID);while(UsrC210SendCmd((char*)strBuf)!=1){if(i++>CmdRepeatCount){status=0;break;}}if(!status)continue;//8. SET TCP CLIENTi=0;sprintf((char*)strBuf,"AT+SOCKA=%s\r\n",SERVERMSG);while(UsrC210SendCmd((char*)strBuf)!=1){if(i++>CmdRepeatCount){status=0;break;}}if(!status)continue;//9. Reset The UsrC210i=0;while(UsrC210SendCmd("AT+Z\r\n")!=1){if(i++>CmdRepeatCount){status=0;break;}}if(!status)continue;else{delay_ms(5000);break;}
}

} 在Wifi模块初始化中，需要定义一些参数，这样初始化后的模块就能拥有连接到以太网的信息。 uint8_t STAMSG[60]=“CMCC-sct3,45mnbqdb”; //连接的网络名字和密码

uint8_t APMSG[40]=“WG-0001,WG123456”;//模块作为AP的名字和密码

uint8_t LOGINMSG[40]=“WG-0001,WG123456”;//登录模块的名字和密码

uint8_t SERVERMSG[72]=“TCPC,47.103.12.149,8181”;//远程服务器端口
uint8_t ServerName[20]=“test.usr.cn,80”; //可以随便配置
uint8_t UrlName[12]=“/1.php[3F]”;

char OKMSG[4]={0x10,0xAA,0xBB,0xCC};//接收到正确信号返回信息
char PLSMSG[4]={0x10,0xCC,0xDD,0xEE};//发送心跳信号，如每秒连接
char RESMSG[4]={0xFF,0xFF,0xFF,0xFF};//返回保留信息`

四、定义通信协议

协议解析代码
`void Decode_Packet(void)
{

u8 packet_len;
u8 relay_status[4];
u16 crc_get, crc_cal;if(UartRecvMessage())
{packet_len = uart1receBuf[0];if(packet_len==0x10){crc_get = uart1receBuf[packet_len - 2];crc_get = (crc_get<< 8) | uart1receBuf[packet_len -1];    crc_cal = crc16(uart1receBuf,packet_len-2);if(crc_get!=crc_cal){return;}else{ic_address=uart1receBuf[1];R=uart1receBuf[2];B=uart1receBuf[3];G=uart1receBuf[4];W=uart1receBuf[5];relay_status[0] = uart1receBuf[6];relay_status[1] = uart1receBuf[7];relay_status[2] = uart1receBuf[8];relay_status[3] = uart1receBuf[9];reserved_data = (uart1receBuf[10]<<24)|(uart1receBuf[11]<<16)|(uart1receBuf[12]<<8)|(uart1receBuf[13]);DMX512_Buf_Init(0xf0);Update_Led();LedFlag = 1;Relay_Operation(1,relay_status[0]);Relay_Operation(2,relay_status[0]);Relay_Operation(3,relay_status[0]);Relay_Operation(4,relay_status[0]);SendOK();}    }UartFlushRecvBuf();
}

} 软件CRC解析 unsigned short crc16(unsigned char *src, unsigned long sizes) {

unsigned char *ptr = NULL;unsigned short i, j, n, ccitt;
unsigned short c = 0;
unsigned short  tabccitt[256];unsigned short crc = 0;
unsigned short tmp = 0;
unsigned short sc = 0;for (i = 0; i < 256; i++) {ccitt = 0;c  = i << 8;for (j = 0; j < 8; j++) {if ( (ccitt ^ c) & 0x8000 ){ccitt = ( ccitt << 1 ) ^ 0x1021;}else{ccitt =   ccitt << 1;}c = c << 1;}tabccitt[i] = ccitt;
}ptr = src;
crc = 0xFFFF;
if (ptr != NULL) for (n = 0; n < sizes; n++) {sc = 0X00FF & (unsigned short) *ptr;tmp     = (crc >> 8) ^ sc;crc     = (crc << 8) ^ tabccitt[tmp];ptr++;
}return crc;

} 定时发送心跳连接函数 void SendPulse(void)
{

u8 buf[16];
u16 i, crc;for(i = 0; i <= 13; i++)
{if(i<=3)buf[i]=PLSMSG[i];else if(i<=9)buf[i]=MID[i-4];elsebuf[i]=RESMSG[i-10];
}
crc = crc16(buf,14);
buf[14] = crc>>8;
buf[15] = (crc&0x00ff);
Send_Data_Uart3((char *)buf,16);

}
`
主函数While循环的操作

`while(1)
{Decode_Packet();if(TimerCmdFlag>=PULSE_TIME){TimerCmdFlag = 0;Send_Pulse();LED0 = !LED0;}
}`

五、实验效果