[W5100S-EVB-Pico]: How to set PHY_SPEED to 100Mbit/s ?

Question

Hello all, sorry for making another post, but there is a lack of basic examples on wiznet GitHub… As a starting point I followed the DHCP_DNS example and modified it into a simple UDP-sender to test the performance on the “PC”-side using “iperf”. However, the bandwidth is limited to 8-9MBit/s and I think the PHY is working at 10MBit/s and not 100Mbit/s. I changed the CPU SYS Clock to 240MHz and the SPI clock used by wiznet driver to 55MHz. I found this post (Can't connect with 100Mbit) where another user found a way to set the 100MBit/s but its not working for me. My minimal code is listed below, but unfortunately it is not working, since the speed is still 10MBit/s. How do I properly set the speed to 100MBit/s ? int main(){ /* SYS clock settings of the RP2040 */ set_sys_clock_khz(PLL_SYS_FREQ_KHZ, true); clock_configure(clk_peri, 0, CLOCKS_CLK_PERI_CTRL_AUXSRC_VALUE_CLKSRC_PLL_SYS, PLL_SYS_FREQ_KHZ*1E3, PLL_SYS_FREQ_KHZ*1E3); stdio_init_all(); sleep_ms(4000); printf("<%s>: System clock in Hz: %d ",EXAMPLE_NAME, clock_get_hz(clk_sys)); printf("<%s>: Launching Wiznet driver... ",EXAMPLE_NAME); /* Launch Wiznet driver */ wizchip_spi_initialize(); // Initialize the SPI with DMA capability wizchip_cris_initialize(); // Initialize cris wizchip_reset(); // Reset the Wiznet chipset wizchip_initialize(); // Initialize the Wiznet chipset wizchip_check(); // Check the Wiznet configuration? /* Approach for setting the PHY to 100MBit/s */ wiz_PhyConf cnf; // Ethernet controller CHIPUNLOCK(); setMR2((uint8_t)getMR2() | 0x80); CHIPLOCK(); PHYUNLOCK(); setPHYCR0(0x00); setPHYCR1(0x01); PHYLOCK(); cnf.mode = PHY_MODE_MANUAL; cnf.speed = PHY_SPEED_100; cnf.duplex = PHY_DUPLEX_FULL; ctlwizchip(CW_SET_PHYCONF, (wiz_PhyConf*)&cnf); printf("<%s>: Wiznet driver launched ",EXAMPLE_NAME); printf("<%s>: Launching network initialization... ",EXAMPLE_NAME); network_initialize(g_net_info); // apply from DHCP printf("<%s>: Network initialization done ",EXAMPLE_NAME); /* Initialize UDP socket */ printf("<%s>: Launching UDP socket initialization ",EXAMPLE_NAME); tcp_socket_retval = socket(0, Sn_MR_UDP, SOCKET_TCP_PORT,0); if(tcp_socket_retval !=0){ printf("<%s>: Failed to create UDP socket ",EXAMPLE_NAME); } printf("<%s>: UDP socket created! ",EXAMPLE_NAME); uint8_t destip[4]={192,168,1,118}; char buffer_tx[512]; for(int i=0; i<512; i++){ buffer_tx[i]=i; } printf("<%s>: Entering the main loop now! ",EXAMPLE_NAME); while(1) { sendto(0,buffer_tx,sizeof(buffer_tx),destip,SOCKET_TCP_PORT); } } Best regards, opcodex64

austin · Answer

Hello @opcodex64 Please refer to the example code below and check it after adding it. Change PHY configuration /* W5x00 configuration header */ #include "wizchip_conf.h" FUNCTION(void) { /* PHY configuration structure */ wiz_PhyConf phy_conf; /* Configure PHY */ phy_conf.by = PHY_CONFBY_SW; phy_conf.mode = PHY_MODE_MANUAL; phy_conf.speed = PHY_SPEED_100; phy_conf.duplex = PHY_DUPLEX_FULL; /* Apply PHY configuration */ wizphy_setphyconf(&phy_conf); } Reset PHY FUNCTION(void) { /* Reset PHY */ wizphy_reset(); } Additionally, you can use ‘wizpy_getphyconf()’ to get PHY configuration, so please refer to it.

opcodex64 · Answer

Hello austin, thanks for your reply! I think it worked for me, since I was able to achieve 14MBit/sec using “iperf” in server mode (TCP). Furthermore, I wrote a simple tcp server application in python where I receive a fixed datasize using the python “recv”-function (socket library!). To calculate the transfer speed, one need the data transmission time and for this I have just calculated the difference between the timestamp before and after the “recv”-function in python. However, for a datasize of approx. 100MBytes I achieve a net speed using TCP protocol of 20-22MBit/sec, which is fine for the W5100S, since the limit is 25MBit/sec max. according the datasheet. I can share the code after “cleaning it up”, if desired. Best regards, opcodex64

austin · Answer

Hi @opcodex64 If you can share the code, please share it. I think it will be helpful not only for W5100S-EVB-Pico but also for many people who use W5100S. Thank you.