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
Reply by Kiran Vinta●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 Gary Kato●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 Kiran Vinta●May 3, 20042004-05-03
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.