8051 Serial port

-how to "abort byte in progress".

-how to minimize the delay between write to SBUF and the start bit on tx.

1) That cannot be done on a std 8051. A power off, reset or TR1 = 0; would maybe do something like that and debugging would not be a funny task at all.

2) Create your own 8051. ( faster XTAL? )


Alex

-how to "abort byte in progress".

-how to minimize the delay between write to SBUF and the start bit on tx.

1) That cannot be done on a std 8051. A power off, reset or TR1 = 0; would maybe do something like that and debugging would not be a funny task at all.

2) Create your own 8051. ( faster XTAL? )


Alex

a "funny" (rather sad) story about J1708 and the pseudorandom "int rand(void);"

The J1708 specification specify that after a collision a random delay is to be invoked before the transmission is attempted.

Two devices, both using the Keil "int rand(void);" collided and since the random delay was the same for the two every time they just kept colliding.

WARNING:
When doing J1708 do not rely on pseudorandom use a true random. I have a free running timer that save the value at the end of each transmission from the individual device and this seems to work.

Erik