W5500 strange behaviour of interrupts

Question

Hi, I wonder why interrupts comes from another socket and set IR register Interrupts init socket_0_config.sn = 0 //structure of socket settings setIMR (0x00); // Not use Wizchip IR if (getIMR()!=0x00) UART_Printf(“ ERROR: IMR set”); //check seted val setSIMR (1< IR: 0x%02X <---- ”,getIR()); UART_Printf(“ ----> SIR: 0x%02X <---- ”,getSIR()); UART_Printf(“ ----> Sn_IR: 0x%02X <---- ”,getSn_IR(socket_0_config.sn)); UART_Printf (" 0x%02X MP:%d,PPPoE:%d, Un:%d, Conf:%d ", socket_0_config.uWIZ_IR.WIZ_IR_reg, socket_0_config.uWIZ_IR.WIZ_IR_Flags.IR_MPack, socket_0_config.uWIZ_IR.WIZ_IR_Flags.IR_PPPoEConClose, socket_0_config.uWIZ_IR.WIZ_IR_Flags.IR_DestUnreach , socket_0_config.uWIZ_IR.WIZ_IR_Flags.IR_IPConflict); socket_0_config.uSIR.IR_reg = 0; //cl reg socket_0_config.uWIZ_IR.WIZ_IR_reg = 0; //clr setSn_IR(socket_0_config.sn,0x1F); //ACK socket interrupts and clear int setIR(0xF0);//ACK chip interrupts and clear int } Printf return at terminal This is interrupt generated when I send data from chip to PC. —> IR: 0x20 <---- ----> SIR: 0x20 <---- ----> Sn_IR: 0x00 <---- 0x20 MP:0,PPPoE:1, Un:0, Conf:0 As you can see the wizchip interrupt PPPoE is generated. I don’t know why (It is blocked). I expect Sn_IR SEND_OK int. Thanks for support Krzysztof Edit. This behaviour only occurs when I set SEND_OK interrupt mask in Sn_IMR setSn_IMR(socket_0_config.sn,(SIK_SENT))

irina · Answer

IMR , Sn_IMR , and SIMR are related to the activation of the interrupt pin. IR <->IMR, Sn_IMR<-> Sn_IR, SIMR <->SIR are the corresponding values of the bits. For example, When a bit of IMR is ‘1’ and the corresponding bit of IR is ‘1’, an interrupt Pin will be issued. In other words, if a bit of IMR is ‘0’, an interrupt pin will not be issued even if the corresponding bit of IR is ‘1’. Therefore, the IMR value indicates whether the Interrupt pin is activated, and even if the IMR value is ‘0’, it doesn’t affect the IR value becoming ‘1’. Other values do the same.

irina · Answer

Could you please tell me the value that bit ‘3’ of MR register(0x0000)? I think that the bit is enabled. image658×796 80.5 KB image624×649 56.6 KB

Krzysztof · Answer

Of course, I put debug printf on main while loop: UART_Printf(“
MR reg 0x%02X”, getMR()); From terminal: MR reg 0x00