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AVR459
14.6.3 Errors
At 4800 baud, there is only 208 clock cycles for SB201 between each bit. This means
that to ensure error free communication all the time, all other interrupts would have to
be less than 104 cycles, including the prologue of the timer interrupt. This is not
always true for the interrupt service routines used by SB201. However, since those
interrupts (CCADC & VADC conversion complete) only runs once per second, and
since the blocking interrupts has to occur just a few cycles before the timer interrupt,
a retransmission of the “broken” communication is sufficient and adequate to solve
this.
The errors the host can detect include:
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Wrong command returned by SB201
Frame error on data sent from SB201
PEC incorrect on data sent from SB201
SB201 does not respond within reasonable time (min 50ms)
SB201 sends a NACK to indicate an error occurred
On all those errors the host should send a break/arbitration lock and retransmit. A
break/arbitration lock is a minimum of 18 normal bit periods of low on the
communication line. This resets the communication on SB201 and makes it ready to
receive a new transmission. A break can be sent as soon as the error is detected.
If the same command fails many times in a row, that command is probably not
supported by SB201 or something serious is wrong. It might be that the frequency of
the clock on the host or SB201 has changed too much or maybe that SB201 have
shut itself down.
15
8132A-AVR-10/08
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