W5500 Interrupt not triggering

Question

Hi, I’m working with W5500 for a college project and I’ve run into a bit of a concrete wall. I’ve crafted my own TCP/IP server for connecting with STM32F407G-DISC1 over LAN using W5500 chip and serving data to a central interface. Issue I’m currently having is that my HW Interrupt generated by W5500 chip is not being triggered. Here is the relevant code: uint8_t ETH_SocketInit(uint8_t *sck) { int8_t ret; if ((ret = socket(*sck, Sn_MR_TCP, 5000, SF_TCP_NODELAY)) != 0) { return -1; } setSn_IR(*sck, 0x1f); // clearing all interrupts on chip setSn_IMR(*sck, 0x04); // setting the socket mask to RECV sprintf(msgbuf, "Socket initialized!
"); HAL_UART_Transmit(&huart6, (uint8_t*) msgbuf, strlen(msgbuf), 100); return 0; } INT pin is connected to PB0 pin on my board which is in EXTI trigger on falling edge and no pull up/down configuration (although I’ve tested with both to no avail). EXTI0 line is enabled and the interrupt callback gets triggered properly once I physically unplug the connector and it goes from high to low state. void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin) { UART_Message("HEY IT WORKS
"); ETH_Listen(&sck, ethbuf); } int8_t ETH_Listen(uint8_t *sck, char* buf){ int RSR_Len = 0, repeat = 500; while(!RSR_Len && repeat){ RSR_Len = getSn_RX_RSR(*sck); } if(!repeat){ return 0; } else { return recv(*sck, buf, RSR_Len); setSn_IR(*sck, 0x1f); } } My server writes “ping
” to the connection every 2 seconds and the data goes through to the chip, but the INT line is not being triggered. note : I am aware that interrupt callback should only be setting a flag, this is just for development and will be done properly

Eugeny · Answer

Format code properly because it is wrongly displayed.

Eugeny · Answer

Thanks. What is about setting SIMR register appropriately?

Adel Sehic · Answer

It is set using setSn_IMR(socket, 0x04) inside ETH_SocketInit function. 0x04 translates to 0000100 mask, which is to correct mask to only get RECV interrupt. EDIT: Forgive me, I did not read the documentation carefully enough and did not realize that SIMR is a separate register. I’ve modified the function to be uint8_t ETH_SocketInit(uint8_t *sck) { int8_t ret; if ((ret = socket(*sck, Sn_MR_TCP, 5000, SF_TCP_NODELAY)) != 0) { return -1; } setSn_IR(*sck, 0x1f); setSn_IMR(*sck, 0x04); setSIMR(*sck); sprintf(msgbuf, "Socket initialized!
"); HAL_UART_Transmit(&huart6, (uint8_t*) msgbuf, strlen(msgbuf), 100); return 0; } but no interrupt is still occurring. Have I misunderstood the function?

Adel Sehic · Answer

Forgive my brain malfunction, yes - setting the correct mask for SIMR (and not sending the socket number which is 0 which disables the entire register) was the solution, interrupt works properly. Many thanks!