Currently, I am trying to interface the a cs8900a to the motorola 6812 microcontroller. A desecription and schematic of the board I am using can be found at http://www.invector.nu/iet8900.asp. Additionally, I have been using the cs8900a in 8 bit mode (or trying to). I am able to read from registers or any place in internal memory using the packetpage pointer and packetpage data registers (i.e. I can read the product ID register). My main problem is that I I am unable to transmit any packets. I am connecting my ethernet module to my pc via a crossover cable. On my pc, I have an ethereal packet sniffer running to see if I was able to send anything. Right now I am able to get a bid for transmit (the RDY4txNow bit goes high) but it will not transmit anything. Also when I put the while loop in for the repeated transmit, the cs8900a will not reset and the link light will not come on. If I comment out the while loop, the reset light does come on but it still does transmit anything. I think it either may be compiler problems or timing issues. How long must I wait after I reset to start transmitting anything? I've looked in cirrus's 8-bit application note for transmitting and I've read the data sheet for transmitting many times (section 5.7). Im really stumped so any help will be appreciated. Motorola ports - IET 8900a pins PORTT[7:0] - AD[7:0] PORTJ[7:4] - D[3:0] PORTJ[0] - AEN PORTJ[1] - IOR PORTJ[2] - IOW #include "HC12.h" //port maps #define PPPtr 0x0a //address of packet page pointer #define PPData 0x0c //address of packet page data register #define RxTxData 0x00 // Receive/Transmit data (port 0) #define RxTxData1 0x02 // Receive/Transmit data (port 1) #define TxCmd 0x04 // Transmit Command #define TxLength 0x06 // Transmit Length #define ISQ 0x08 // Interrupt status queue #define bkpt asm("bgnd"); //waits a time/4 ms void mswait(unsigned short time){ for(;time>0;time--){ TC5=TCNT+2000; // wait TFLG1 = 0x20; // clear C5F while((TFLG1&0x20)==0){}; } } void TimerInit(void){ COPCTL = 0x00; // disable COP TIOS |= 0x20; // enable OC5 TSCR =0x80; // TEN(enable) } //changing the wait periods does not change the final data output unsigned char IOread (unsigned char address) { unsigned char data; DDRT = 0x00; //set port t as input PORTJ = ((address<<4)&0xF0) | 0x07; //put address on pins PORTJ &= ~0x01; //pulsing AEN PORTJ &= ~0x02; //IOR mswait(1); //wait data = PORTT; //capture data PORTJ |=0x02; //end pulse IOR PORTJ |= 0x01; //end pulse AEN return data; } //changing the wait periods does not change the final data output void IOwrite (unsigned char address, unsigned char value) { DDRT = 0xff; //set port as output PORTT = value; //Port T equals data value PORTJ = ((address<<4)&0xF0) | 0x07; //put address on pins PORTJ &= ~0x01; //pulsing AEN PORTJ &= ~0x04; //IOwrite PORTJ &= ~0x02; mswait(1); PORTJ |=0x02; PORTJ |=0x04; //end IOW PORTJ |= 0x01; //end pulse AEN } unsigned char reading; //first byte for input unsigned char reading1; //second byte for input unsigned char BusST0, BusST1; unsigned char event0, event1; void main(void){ DDRH = 0xFF; //set Port H as outputs event0 = 0x00; reading = 0x00; //setting reading to zero reading1 = 0x00; //sertting reading1 to zero COPCTL = 0x00; //disable COP // SCI_Init(13); //initialize SCI interface TimerInit(); //initialize timer unit DDRJ = 0xff; //set port j as outputs PORTJ |= 0x07; // PORTH |= 0x01; //pulse reset mswait(1000); //250 ms PORTH &= ~0x01; //end pulse reset // mswait(1); // Configure RxCTL fo Promiscious mode, RxOK // (1) Write 0x0104 to PacketPage Pointer // (2) Write 0x0180 to PacketPage Data Port IOwrite(PPPtr, 0x04); IOwrite(PPPtr + 1, 0x01); IOwrite(PPData, 0x80); IOwrite(PPData + 1, 0x01); // Set 10BaseT, SerRxOn, SerTxOn in LineCTL // (1) Write 0x0112 to PacketPage Pointer // (2) Write 0x00c0 to PacketPage Data Port IOwrite(PPPtr, 0x12); IOwrite(PPPtr + 1, 0x01); IOwrite(PPData, 0xc0); IOwrite(PPData + 1, 0x00); while (1) { // Send the transmit command IOwrite(TxCmd, 0xc0); //wait for whoel fram IOwrite(TxCmd + 1, 0x00); // 8 bytes to be sent IOwrite(TxLength, 0x04); //sending 8 byte IOwrite(TxLength + 1, 0x00); IOwrite(PPPtr, 0x38); //address of busST register IOwrite(PPPtr + 1, 0x01); // Bid for transmit do { BusST0 = IOread(PPData); BusST1 = IOread(PPData+1); }while(!(BusST1==0x01)); //check for rdy4txnow IOwrite(RxTxData, 0x12); //sending test data IOwrite(RxTxData+1, 0x23); IOwrite(RxTxData, 0x45); IOwrite(RxTxData+1, 0x67); IOwrite(RxTxData, 0x89); IOwrite(RxTxData+1, 0xab); IOwrite(RxTxData, 0xcd); IOwrite(RxTxData+1, 0xef); } } -Kiran Vinta ps Ive talked to the invector but they are very slow in responding.
CS8900a problems (very long post)
Started by ●May 3, 2004
Reply by ●May 3, 20042004-05-03
>I think it either may be compiler problems or timing issues.To see if there are compiler problems, look at the code generated by your compiler and see if it matches what you intended. Most compilers can produce combined assembly/C listings. Some debuggers also provide this.> How long must I wait after I reset to >start transmitting anything? I've looked in cirrus's 8-bit >application note for transmitting and I've read the data sheet for >transmitting many times (section 5.7).Try section 3.3 of the datasheet - "Reset and Initialization". Another helpful document might be the CS8900a FAQ at Cirrus Logic's website.
Reply by ●May 4, 20042004-05-04
I have looked at those documents but they still do not help me very much. garykato@aol.com (Gary Kato) wrote in message news:<20040503073923.27424.00000340@mb-m24.aol.com>...> >I think it either may be compiler problems or timing issues. > > To see if there are compiler problems, look at the code generated by your > compiler and see if it matches what you intended. Most compilers can produce > combined assembly/C listings. Some debuggers also provide this. > > > How long must I wait after I reset to > >start transmitting anything? I've looked in cirrus's 8-bit > >application note for transmitting and I've read the data sheet for > >transmitting many times (section 5.7). > > Try section 3.3 of the datasheet - "Reset and Initialization". > > Another helpful document might be the CS8900a FAQ at Cirrus Logic's website.
Reply by ●May 4, 20042004-05-04
Kiran, Adam Dunkels uIP package supports the CS8900a. Check out his source code. http://www.sics.se/~adam/uip/ It is written in C with some embedded 6502 assembler. Perhaps that might be helpful to you. Glenn
