W5200 Sn_CR(0) register is not clearing automatically

Question

Hi I’m using W5200 and your driver V1.5 with my STM32F103 board. I have written the initial registers such (GAR, SUBR SIPR etc) all are ok. But When I try to initiate sockets by sending following fucntion socket(s, Sn_MR_TCP , S0_SourcePort, 0) The w5200 chip starts endless loop I have debugged in detail. The cpu is going to endless loop in close(s) command The cpu sends Sn_CR_CLOSE command. But the chip is not operating. Sn_CR(0) register content is always 0xFF after sending the close command. It should be cleared to 0x00 automatically */ void close(SOCKET s) { #ifdef DEF_IINCHIP_DBG printf(“close()
”); #endif IINCHIP_WRITE(Sn_CR(s),Sn_CR_CLOSE); /* wait to process the command... */ while( IINCHIP_READ(Sn_CR(s)) ) ; /* ------- */ /* all clear */ IINCHIP_WRITE(Sn_IR(s), 0xFF); } Rgds

irinakim · Answer

Hi, Selaslan You’re right. After W5200 identifies the command, the Sn_CR register is automatically cleared to 0x00. Even though Sn_CR is cleared to 0x00, the command is still being processed. Therefore, you have to check the Sn_IR or Sn_SR registers. I could not understand. You says “Sn_CR(0) register content is always 0xFF after sending the close command.” Sn_CR don’t have 0xFF. If you read the Sn_IR after Sn_CR command excute, It has 0xFF. Please you have to check the Sn_IR or Sn_SR registers. Best regards, Irian Kim