[From QnA]I can't read or write registers via SPI

Question

I bought 3 your module wiznet810mj and I attempted work with it via SPI . I use PIC18F452 which has hardewr SPI protocol. When I attempt read some register (example MR) I always get 0 from return same thing is when i write in some register. I read all datasheet of w5100 and check out more time connected pins. I first reset w5100 and wait some ms then enable SPI_EN and wait some ms and then send command in format f0adress (2B)data(1B). I don’t know what can I do next??? Wiznet810mj which I got from you is fill with IP Subnet mask and enable PING. When I attempt fill MR register with 0 (because I want disable ping) I can’t. A send my example code, maybe help you that tell me where I make wrong! #include <18F452.h> #DEVICE ADC=10 #use delay(clock=8000000) #use rs232(baud=19200,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,stream=PC,errors) #fuses HS,NOWDT,NOPROTECT,NOLVP,PUT,NOSTVREN #include #include #include #bit SMP=0xFC7.7 #bit CKE=0xFC7.6 #bit CKP=0xFC6.4 #bit SSPM1=0xFC6.1 #bit SSPM0=0xFC6.0 #bit SSPEN=0xFC6.5 #bit CS=0xF82.2 #bit BF=0xFC7.0 #bit TRS3=0xF94.3 #bit TRS5=0xF94.5 #bit SSPIF = 0xF9E.3 void wiznet_init() { output_bit(PIN_C0,1); //PIN_CO connected to reset pin delay_ms(10); output_bit(PIN_C0,0); delay_ms(10); output_bit(PIN_C0,1); delay_ms(10); SMP = 0; // input is valid in the middle of clock CKE = 0; // rising edge is data capture CKP = 0; // high value is passive state SSPM0 = 0; SSPM1 = 1; // speed f/64(312kHz), Master SSPEN = 1; // enable SPI CS = 1; // disable wiznet } int SPI(int d) // send character over SPI { SPI_write(d); // send character // while (!BF); // wait until sent //return SPI_READ(); // and return the received character } int send_wiz_command() { int arg3,arg2,arg1,arg0; int pom=255; // command string - fill mr registar with 0 arg3=0xf0;// make8(cmd,3); arg2=0x00;//make8(cmd,2); arg1=0x00;//make8(cmd,1); arg0=0x00;//make8(cmd,0); CS = 0; SPI(arg3); SPI(arg2); SPI(arg1); SPI(arg0); CS = 1; arg3=0x0f;// make8(cmd,3); arg2=0x00;//make8(cmd,2); arg1=0x00;//make8(cmd,1); arg0=0x00;//make8(cmd,0); CS = 0; SPI(arg3); SPI(arg2); SPI(arg1); SPI(arg0); pom=spi_read(); CS = 1; printf("rez2 = %d ",pom); } void main() { int16 brojac=0; output_bit(PIN_C1,0); // PIN_C1 - connected to SPI_EN wiznet_init(); output_bit(PIN_C1,1); // PIN_C1 - connected to SPI_EN delay_ms(5); send_wiz_command(); petlja : goto petlja ; } Help me PLEASE!

wiznetmuseum · Answer

Dear Sir, For the SPI control, SPI_EN pin is asserted High and /SCS pin starts with Low and ends with High. Please refer to below code. =============================================================== /** @brief This function writes the data into W5100 registers. */ uint8 IINCHIP_WRITE(uint16 addr,uint8 data) { IINCHIP_ISR_DISABLE(); IINCHIP_SpiInit(); //SPI MODE I/F IINCHIP_CSoff(); // SCS=0, SPI start IINCHIP_SpiSendData(0xF0); //Write OP code IINCHIP_SpiSendData((addr & 0xFF00) >> 8); //High Address IINCHIP_SpiSendData(addr & 0x00FF); //Low Address IINCHIP_SpiSendData(data); //Write Data IINCHIP_CSon(); // SCS=1, SPI end IINCHIP_ISR_ENABLE(); return 1; } /** @brief This function reads the value from W5100 registers. */ uint8 IINCHIP_READ(uint16 addr) { uint8 data; IINCHIP_ISR_ENABLE(); IINCHIP_ISR_DISABLE(); IINCHIP_SpiInit(); IINCHIP_CSoff(); // SCS=0, SPI start IINCHIP_SpiSendData(0x0F); //Read OP code IINCHIP_SpiSendData((addr & 0xFF00) >> 8); //High Address IINCHIP_SpiSendData(addr & 0x00FF); //Low Address IINCHIP_SpiSendData(0); data = IINCHIP_SpiRecvData(); //Read Data IINCHIP_CSon(); // SCS=1, SPI end IINCHIP_ISR_ENABLE(); return data; }