MIDI input with the BS2

Kevin Harris

Hi, I'm working a receiving MIDI signals from a MIDI keyboard.· I realize that the unbuffered inputs of the Stamp are not very reliable, but for now I'm plugging the keyboard directly to power, I/O, and ground as specified in Jon Williams'· "Gettin' MIDI with it" article.· I'm trying to simply receive the typical "note on" 3-byte message, but I can't seem to get more than the first byte of any message.· It appears that the other 2 bytes were never even sent, but I tried this with two different keyboards and get identical results.· Is this the result of the unbuffered I/O?· My code is as follows:

serData VAR Byte

DO
· SERIN 1, 12, [noparse][[/noparse]serData]
· DEBUG HEX serData, " "
LOOP

Every time I push a key I get a 90 note on and nothing following, and an 80 note off when the key released (also with nothing following).· Anyone have any ideas?

Thanks,
Kevin Harris

Bean

Kevin,
You need to receive all the bytes at one time. You are losing the incoming data because the stamp is processing the DEBUG line while the rest of the data is coming in. By the time the stamp gets back to the SERIN instruction, there is no data to receive.

Use something like: SERIN 1,12,[noparse][[/noparse]serData1, serData2, serData3]


Bean.

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