W5500 UDP Recieve Working but SEND not working

Question

Hi i have following Wiznet W5100 board http://www.ebay.in/itm/112321091012?aff_source=Sok-Goog and i am interfacing it following STM32 Board using UDP http://www.st.com/en/evaluation-tools/stm32vldiscovery.html I am trying to make an Echo server. Whatever data is sent to my chip via W5500 , data is returned back to the PC. I have a C# program written by myself to send and receive data using UDP socket. I am Monitoring communication by Wireshark. UDP send from PC is working ok. i can see the data sent in wireshark and data is received without any problem in my C program. But when i send the data back to the PC, Function SendData is stuck inside while(1) loop such that Sok_0_INTR_Value is always 0x04. I neither get timeout or send_ok. Physically there is a direct connection by patch cable between W5500 and my laptop. and w5500 gateway defined as laptop IP Thank You #include #include #define BSB_Common_Reg 0b00000 // Block Selection Bits - Common Reg #define BSB_Sok_0_Reg 0b00001 #define Wiz_CS GPIO_Pin_3 // Port A #define Wiz_RST GPIO_Pin_2 // Port A unsigned volatile char DataRecieved = 0 ; // To be changed by Socket Interrupt = Volatile int main(void) { SPI1_setup(); Wiz_Setup_A_INIT(); Wiz_Setup_B_OPEN(); unsigned short RecvCount = 0 ; unsigned short Count = 0 ; unsigned char Data[64]; unsigned char SCADAInfo[8]; while(1) { GPIO_SetBits(GPIOC, GPIO_Pin_8 | GPIO_Pin_9 ); Delay(1,500); // 500 Mili Sec GPIO_ResetBits(GPIOC, GPIO_Pin_8 | GPIO_Pin_9 ); Delay(1,500); // 500 Mili Sec RecvCount = DataRecievedCheck(); if( RecvCount ) { GetData(Data , &Count ,SCADAInfo); // Recieve Data = Closes Soket in the end SendData(Data ,Count ); // Send Data = Closes Soket in the end __disable_irq(); RecvCount = 0 ; // Atomic __enable_irq(); Wiz_Setup_B_OPEN(); // Wiz UDP = Open-Close Socket every Time. But NOT in Wiz TCP } } return 1 ; } void Wiz_Setup_A_INIT(void) { unsigned short GAR = 0x0001 ; // Gateway 4 Bytes unsigned short SUBR = 0x0005 ; // Subnet 4 Bytes unsigned short SAR = 0x0009 ; // Source Hardware Address MAC - 6 Bytes unsigned short SIPR = 0x000F ; // IP Address 4 Bytes unsigned short RCR = 0x001B ; // Retry Count, Retry Attempts = RCR + 1, Set RCR = 2 so Attempts = 3 unsigned short SIMR = 0x0016 ; // Socket Interrupt Mask , Only enable for the Intterupts u would use , SIR = 0X00 = CLEARED BY STM32 // Reset Delay(1,200); // 200 Mili Sec GPIO_ResetBits(GPIOA, Wiz_RST); Delay(1,5); // Reset Time = 1.5 Mili Sec GPIO_SetBits(GPIOA, Wiz_RST); Delay(1,2); // 2 mili sec // Auto Negotionaion = 2 Chips decide their Speed ( 10 / 100 MBPs ) and Duplex ( Sigle / double) // Link = Up => Auto Negotiation is success // unsigned short PHYCFGR = 0x002E ; // unsigned char PHYCFGRValue = 0x00 ; // If PHYCFGRValue && 0x01 = 1 => Link UP // while( ( PHYCFGRValue & 0x01) != 0 ) // 0Th bit of PHYCFGR Reg = 1 // Wiz_Read_Multi( PHYCFGR , BSB_Common_Reg , &PHYCFGRValue , 1); // Mode Reg = 0x00 after Reset = ok unsigned char mac[] =…

Eugeny · Answer

This situation may happen in the following circumstances: you do not give SEND command to the W5500; you have data size set to 0 (so there’s nothing to send); W5500 does not know where (or how) to send. To be able to send it must know DHAR of the remote device, there should be valid port set. Does W5500 get responses (from laptop) for its ARP request packets?

Sachin Singh · Answer

Thanks for quick repply, i managed to solve the issue I get PING reply from W5500. i was making 3 mistakes (1) i was sending data on a UDP socket which was not open , and after this Polling methd recieve and transmit started to work as expected GetData(Data , &Count ,SCADAInfo); Wiz_Setup_B_OPEN(); // This Line was missing SendData(Data ,Count ); Wiz_Setup_B_OPEN(); later i wanted to use interrupt which was not working but i found out following error (2) correected SIMR = 0x0018. it was previously set to 0x0016 Now Interrupt would keep firing Endlessly. Send would fire Send_Ok interrupt which would set my volatile DataRecieved = 1 so SendData function was executed endlessly To fix this , i disabled all interrupts at start of SendData function and enabled only Socket_0 interrupt in the end (3) unsigned short SIMR = 0x0018; unsigned char SIMRValueDisable = 0x00 ; // Disable All Wiz Interrupt unsigned char SIMRValueEnable0 = 0x01 ; // Enable Interrupt 0 Wiz Interrupt Wiz_Write_Multi(SIMR , BSB_Common_Reg , &SIMRValueDisable , 1); // Disable Interrupt Now things are working as expected Thanks for your reply Here is the complete UDP working code both by polling and interrupt on stm32F100RB and Wiznet W5500 #include #include #include #include #include #include #include #include void Wiz_Write_Multi( unsigned short , unsigned char , unsigned char * , unsigned short ) ; // , , Pointer , Array Count void Wiz_Read_Multi( unsigned short , unsigned char , unsigned char *, unsigned short ) ; // , , Pointer , Array Count void LEDSetup(void); void SPI1_setup(void); void SPI_SendBye(unsigned char); unsigned char SPI_ReadByte(); void Tim2_init(unsigned char); void Delay( unsigned char , unsigned short); // 0 = Micro , 1 = Mili void Wiz_Setup_A_INIT(void); void Wiz_Setup_B_OPEN(void); void ExtInterruptLineConfig(void) ; void GetData(unsigned char*…