最近在做以太網數據傳輸,要把AD採到的數據通過網口發送給上位機(客戶端),我採用的是LWIP協議棧,實現了功能。做項目時間緊,也要先看一下LWIP協議棧,TCP ,UDP傳輸協議。我採用的是TCP協議 數據傳輸,好處是傳輸可靠。直接貼代碼,從main開始,
int main(void)
{
SystemInit();
System_Setup();
GpioLed_Init();
Init_Usart();
GPIO_Configuration();
GPIO_Configuration_SPI();
RCC_Configuration();
NVIC_Configuration();
Time_Configuration();
SPI_Configuration();
LwIP_Init();
HelloWorld_init();
while(1)
{
TI_ADC128S022_ADC_vout();
printf("Frequency1= %d HZ.\r\n",Frequency1);
printf("Frequency2= %d HZ.\r\n",Frequency2);
printf("V0=%fmv\r\n",V0);
printf("V1=%fmv\r\n",V1);
printf("V2=%fmv\r\n",V2);
printf("V3=%fmv\r\n",V3);
MCU_to_TCP();
/* Periodic tasks */
System_Periodic_Handle();
}
}
說一下LwIP_Init(); 函數,主要是LWIP協議棧,IP和MAC初始化,
void LwIP_Init(void)
{
struct ip_addr ipaddr;
struct ip_addr netmask;
struct ip_addr gw;
uint8_t macaddress[6]={0,0,0,0,0,1};
/* Initializes the dynamic memory heap defined by MEM_SIZE.*/
mem_init();
/* Initializes the memory pools defined by MEMP_NUM_x.*/
memp_init();
IP4_ADDR(&ipaddr, 192, 168, 1, 198);
IP4_ADDR(&netmask, 255, 255, 255, 0);
IP4_ADDR(&gw, 192, 168, 1, 1);
Set_MAC_Address(macaddress);
netif_add(&netif, &ipaddr, &netmask, &gw, NULL, ðernetif_init, ðernet_input);
/* Registers the default network interface.*/
netif_set_default(&netif);
netif_set_up(&netif);
}
HelloWorld_init();是建立TCP端口,
void HelloWorld_init(void)
{
/* Create a new TCP control block */
pcb = tcp_new();
/* Assign to the new pcb a local IP address and a port number */
/* Using IP_ADDR_ANY allow the pcb to be used by any local interface */
tcp_bind(pcb, IP_ADDR_ANY, 3007);
/* Set the connection to the LISTEN state */
pcb = tcp_listen(pcb);
/* Specify the function to be called when a connection is established */
tcp_accept(pcb, HelloWorld_accept);
}
tcp_bind(pcb, IP_ADDR_ANY, 3007); 是綁定你的端口號和IP地址, pcb = tcp_listen(pcb); 進入監聽,檢查連接,申請TCP_PCB內存,tcp_accept(pcb, HelloWorld_accept);客戶端連接以後的回調函數,可以收發數據。
static err_t HelloWorld_accept(void *arg, struct tcp_pcb *pcb, err_t err)
{
tcp_arg(pcb, mem_calloc(sizeof(struct name), 1)); //回傳建立連接
tcp_err(pcb, HelloWorld_conn_err);//錯誤回調函數
tcp_recv(pcb, HelloWorld_recv);//指定收到數據的回調函數
return ERR_OK;
}
void MCU_to_TCP(void)函數是給單片機(服務器)傳輸數據函數,每次傳輸數據完之後要調用tcp_output(cpcb);函數,用於TCP輸出。我之前調用tcp_write函數,每次只能收到一次數據,需要新創建一個新的pcb協議控制塊,tcp_write之後要調用tcp_output函數,才能不斷髮送數據。
void MCU_to_TCP(void)
{
struct tcp_pcb *cpcb;
for(cpcb = tcp_active_pcbs;cpcb != NULL; cpcb = cpcb->next)
{
memset(GpcBufFileRead, 0x00, sizeof(GpcBufFileRead));
sprintf( (void *)readdata, "Frequency1 = %dHz\nFrequency2 = %dHz\nV0 = %fmv\nV1 = %fmv\nV2 = %fmv\nV3 = %fmv\n", Frequency1,Frequency2,V0,V1,V2,V3);
//tcp_write(pcb, GpcBufFileRead, strlen((void *)readdata), 1);
tcp_write(cpcb,GpcBufFileRead,strlen((void *)readdata),TCP_WRITE_FLAG_COPY);
tcp_output(cpcb);
}
}
這樣就可以簡單實現LWIP TCP數據傳輸了,主要是這幾個地方注意一下,很快可以實現網口數據的發送與接收。
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