Open Source Hardware
This section allows you to view all Show Posts made by this member. Note that you can only see Show Posts made in areas you currently have access to.
if(termMode) //output for the terminal
350: 0d 04 e0 cp0.b w13
352: 00 00 32 bra Z, 0x354
{
RingBuffer[RingWritePostion++]='0';
354: 00 c3 b3 mov.b #0x30, w0
356: 00 73 7c mov.b w0, [w6+w8]
RingBuffer[RingWritePostion++&0xfff]='x';
358: 06 00 e8 inc.w w6, w0
35a: 0a 00 60 and.w w0, w10, w0
35c: 81 c7 b3 mov.b #0x78, w1
35e: 01 70 7c mov.b w1, [w0+w8]
RingBuffer[RingWritePostion++&0xfff]=HXASCII[dat>>4];
360: 06 80 e8 inc2.w w6, w0
362: 0a 00 60 and.w w0, w10, w0
364: 0c 81 fb ze w12, w2
366: c4 10 de lsr.w w2, #0x4, w1
368: e1 40 7f mov.b [w1+w14], w1
36a: 01 70 7c mov.b w1, [w0+w8]
RingBuffer[RingWritePostion++&0xfff]=HXASCII[dat&0x0f];
36c: 63 00 43 add.w w6, #0x3, w0
36e: 0a 00 60 and.w w0, w10, w0
370: 6f 01 61 and.w w2, #0xf, w2
372: 62 41 7f mov.b [w2+w14], w2
374: 02 70 7c mov.b w2, [w0+w8]
376: 64 00 43 add.w w6, #0x4, w0
RingWritePostion&=0xfff;
378: 8a 00 60 and.w w0, w10, w1
37a: 00 00 37 bra 0x37c <.L101>
if(termMode) //output for the terminal
422: 6e 48 90 mov.b [w14+14], w0
424: 00 04 e0 cp0.b w0
426: 00 00 32 bra Z, 0x428
{
RingBuffer[RingWritePostion++]='0';
428: 9e 00 78 mov.w [w14], w1
42a: 2e 00 90 mov.w [w14+4], w0
42c: 80 80 40 add.w w1, w0, w1
42e: 00 c3 b3 mov.b #0x30, w0
430: 80 48 78 mov.b w0, [w1]
432: 1e 0f e8 inc.w [w14], [w14]
RingBuffer[RingWritePostion++&0xfff]='x';
434: f0 ff 20 mov.w #0xfff, w0
436: 1e 00 60 and.w w0, [w14], w0
438: 80 00 78 mov.w w0, w1
43a: 2e 00 90 mov.w [w14+4], w0
43c: 80 80 40 add.w w1, w0, w1
43e: 80 c7 b3 mov.b #0x78, w0
440: 80 48 78 mov.b w0, [w1]
442: 1e 0f e8 inc.w [w14], [w14]
RingBuffer[RingWritePostion++&0xfff]=HXASCII[dat>>4];
444: f0 ff 20 mov.w #0xfff, w0
446: 1e 00 60 and.w w0, [w14], w0
448: 80 00 78 mov.w w0, w1
44a: 2e 00 90 mov.w [w14+4], w0
44c: 00 81 40 add.w w1, w0, w2
44e: 6e 40 90 mov.b [w14+6], w0
450: 00 80 fb ze w0, w0
452: 44 00 de lsr.w w0, #0x4, w0
454: 80 80 fb ze w0, w1
456: 00 00 20 mov.w #0x0, w0
458: 00 80 40 add.w w1, w0, w0
45a: 10 40 78 mov.b [w0], w0
45c: 00 49 78 mov.b w0, [w2]
45e: 1e 0f e8 inc.w [w14], [w14]
RingBuffer[RingWritePostion++&0xfff]=HXASCII[dat&0x0f];
460: f0 ff 20 mov.w #0xfff, w0
462: 1e 00 60 and.w w0, [w14], w0
464: 80 00 78 mov.w w0, w1
466: 2e 00 90 mov.w [w14+4], w0
468: 00 81 40 add.w w1, w0, w2
46a: 6e 40 90 mov.b [w14+6], w0
46c: 00 80 fb ze w0, w0
46e: ef 00 60 and.w w0, #0xf, w1
470: 00 00 20 mov.w #0x0, w0
472: 00 80 40 add.w w1, w0, w0
474: 10 40 78 mov.b [w0], w0
476: 00 49 78 mov.b w0, [w2]
478: 1e 0f e8 inc.w [w14], [w14]
RingWritePostion&=0xfff;
47a: f0 ff 20 mov.w #0xfff, w0
47c: 1e 0f 60 and.w w0, [w14], [w14]
47e: 00 00 37 bra 0x480 <.L106>
perhaps if the scanner was interrupt based/triggered a compromise could be found, the scanner could gather info and the main loop could spit out the results via UART and as long as there wasn't a constant stream and the buffer was big enough, the main loop might have a change of keeping up, but also there might be overheads with a interrupt based routine, pushing and popping all the regs on each trigger would waste alot of cycles, just a few thoughts anyways
He had mentioned on his page, was a hex parsing issue, code attached, I still need to tweak it abit, the buffer storage isnt optimal by any means, but it got me the data i wantedvoid I2C_Sniffer(unsigned char termMode)
{
unsigned char c;
short BufferPos=0;
short n;
unsigned char DataState=0;
unsigned char DataBits=0;
unsigned char Data=0;
unsigned char I2CSda,I2CSdaOld=0;
unsigned char I2CScl,I2CSclOld=0;
SDA_TRIS=1; // -- Ensure pins are in high impedance mode --
SCL_TRIS=1;
SCL=0; // writes to the PORTs write to the LATCH
SDA=0;
CNEN2bits.CN21IE=1; // enable change notice on SCL and SDA
CNEN2bits.CN22IE=1;
IFS1bits.CNIF=0; // clear the change interrupt flag
while((!U1STAbits.URXDA)&&(BufferPos<TERMINAL_BUFFER-4)) // Loops While No User Input Or Buffer Not Full
{
if(IFS1bits.CNIF==0)continue; // If Pins Haven't Changed, Skip Sampling
IFS1bits.CNIF=0; // Clear Change Flag
I2CScl=SCL; // Get Current State
I2CSda=SDA;
if(DataState&&I2CScl&&!I2CSclOld) // Sample When Clock Goes Low To High
{
if(DataBits<8) // The Next 8 Bits Are Data
{
Data=Data<<1;
Data=Data|I2CSda;
DataBits++;
}
else
{
bpConfig.terminalInput[BufferPos]=ESCAPE_CHAR; // Dump Data To Buffer
BufferPos++;
bpConfig.terminalInput[BufferPos]=Data;
BufferPos++;
if(I2CSda) // SDA High Means NACK
{
bpConfig.terminalInput[BufferPos]='-';
BufferPos++;
}
else // SDA Low Means ACK
{
bpConfig.terminalInput[BufferPos]='+';
BufferPos++;
}
DataBits=0; // Ready For Next Data Byte
}
}
else if(I2CScl&&I2CSclOld) // clock high, must be data transition
{ // if data changed while clock is high, start condition (HL) or stop condition (LH)
if(!I2CSda&&I2CSdaOld) // start condition (High To Low)
{
DataState=1; // start condition, allow data byte collection
DataBits=0;
bpConfig.terminalInput[BufferPos]='[';
BufferPos++;
}
else if(I2CSda&&!I2CSdaOld) // stop condition (Low To High)
{
DataState=0; // stop condition, don't allow byte collection
DataBits=0;
bpConfig.terminalInput[BufferPos]=']';
BufferPos++;
}
}
// Save Last Pin State
I2CSdaOld=I2CSda;
I2CSclOld=I2CScl;
}
CNEN2bits.CN21IE=0; // Clear Change Notice
CNEN2bits.CN22IE=0;
while(!U1STAbits.URXDA) // Always Wait For User Input Even If Buffer Is Full
c=U1RXREG;
for(n=0;n<BufferPos;n++)
{
if(bpConfig.terminalInput[n]==ESCAPE_CHAR) // Look For Escape Character
{
n++;
c=bpConfig.terminalInput[n];
if(termMode) // Deside What To Do
{
bpWhex(c); // Terminal Mode
}
else
{
UART1TX(ESCAPE_CHAR); // Raw Mode
UART1TX(c);
}
}
else
{
UART1TX(bpConfig.terminalInput[n]); // Send Captured Data Back
}
}
bpBR;
}