AVR-CDC Issues
Posted: Tue Oct 02, 2007 6:04 pm
The AVR-CDC project seems to be running correctly on my micro (ATMega88).
this is a code snippet of the int main() in the AVR-CDC 2007-07-07 release.
The light will not come on. If I put the SETBIT on before the if statement it will come on.
I have another atmega88 hooked up to this one transmitting "Hello World\n". Shouldn't the usb interrupt become ready at some time? It is not. I know for a fact that the SETBIT macro works fine, it is not the issue, the only issue is why will it not see the data coming from the other micro. I also tried SnoopyPro to send the other way and I get some info that it looks like it is sending to the CDC micro, and it seems to send a response, but I don't get data out of the CDC micro from the pc.
I would appreciate your help.
Code: Select all
/* rs232c -> usb: transmit char */
if( usbInterruptIsReady() ) {
uchar bytesRead, *data;
SETBIT(PORTC,1,1); //I added
bytesRead = uartRxBytesAvailable(&data);
if(bytesRead > 0 || sendEmptyFrame){
if(bytesRead >= HW_CDC_BULK_IN_SIZE) {
bytesRead = HW_CDC_BULK_IN_SIZE;
/* send an empty block after last data block to indicate transfer end */
sendEmptyFrame = 1;
}
else
sendEmptyFrame = 0;
usbSetInterrupt(data, bytesRead);
uartRxDidReadBytes(bytesRead);
}
}
SETBIT(PORTC,1,0); //I Added
this is a code snippet of the int main() in the AVR-CDC 2007-07-07 release.
The light will not come on. If I put the SETBIT on before the if statement it will come on.
I have another atmega88 hooked up to this one transmitting "Hello World\n". Shouldn't the usb interrupt become ready at some time? It is not. I know for a fact that the SETBIT macro works fine, it is not the issue, the only issue is why will it not see the data coming from the other micro. I also tried SnoopyPro to send the other way and I get some info that it looks like it is sending to the CDC micro, and it seems to send a response, but I don't get data out of the CDC micro from the pc.
I would appreciate your help.