Post by thread:[PICLIST] [OT] serial port and midi

Message-ID: <spam_OUTEXECMAIL.1011005121428.ETakeThisOuTsadmark.staffs.ac.uk>> Priority: NORMAL X-Mailer: Execmail for Win32 Version 5.0.1 Build (55) MIME-Version: 1.0 Content-Type: Multipart/mixed; BOUNDARY="Part10110051214.D" --Part10110051214.D Content-Type: Text/Plain; charset="us-ascii" Just to state the obvious I was hoping somebody might be able to help me. Its probably left field for the list but I figured that the because I'm trying to do what ought to be basic things with the serial port somebody might be able to help. Basically I'm trying to read MIDI data over the serial port from within a development kit for VR called WorldToolKit (WTK). There have been a load of 'cheap' sensors (at least compared with VR hardware) developed for performance that use midi and I'm trying to use these to capture data for use in WTK. The format of MIDI involves a status byte where the msb is set to 1 then the data bytes with the bit set to 0. WTK is needed to run the code so its a bit useless to attach it but I shall incase there's osme stupid mistake I'm making converting values. The code almost never reads the status byte but data bytes are read without a problem once their 'in the system'. I know proper midi is being sent as I've set up the system with an instrument attached and I hear notes being played. There are two further problems, the first is that if a batch of midi signals arrive half way through the code's execution (say two of four bytes) the next time around it is invisible to the function WTserial_ntoread which is supposed top tell me if data is waiting. The data is ONLY picked up when a fresh batch arrives, invisible to WTserial_read (the function call that reads the port) and is only picked up when a fresh batch of data arrives! The other issue is that any data with the msb set to 1 is read as its the negative value of it being subtracted from 256, so a status byte of 144 (a basic note on) is read as -112. 240 as -16, 247 as -9 etc. I've tried to convert the value - one might suspect that adding the negative to 256 would do the trick but it returns the same value. One would also expect addition to be communicative but value + 256 transforms the negative value into a positive one. My background is not in programming so I'm sure it must be something dumb but for the life of me I can't work it out! ************************************************ Dr Mark Palmer Arts & Humanities Research Board Fellow School of Art & Design College Road Staffordshire University Stoke-on-Trent ST4 2DE tel: +44 (0)1782 294802 (direct) fax: +44 (0)1782 294873 .....M.W.PalmerKILLspam@spam@staffs.ac.uk ************************************************ --Part10110051214.D Content-Type: Application/Octet-Stream; name="tail.cpp" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="tail.cpp" LyoqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioq KioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioNCg0K RGVzaWduZWQgdG8gcmVhZCBtaWRpIGRhdGEgZW50ZXJpbmcgc2VyaWFsIHBv cnQNCm5vdGlvbiBpcyB0byBjaGVjayBpZiBhbnkgZGF0YSBpcyBwcmVzZW50 DQp0aGVuIGlmIHRoaXMgaXMgdGhlIGNhc2UgY29sbGVjdCBpdA0KDQoNCg0K KioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioq KioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKioqKi8NCiNp bmNsdWRlICJXdC5oIg0KI2luY2x1ZGUgPGlvc3RyZWFtLmg+DQojaW5jbHVk ZSA8c3RyaW5nPg0KDQoNCg0Kdm9pZCBLQm1lbnUoKTsNCnZvaWQgQWN0aW9u cygpOw0Kdm9pZCBNaWRpKCk7DQp2b2lkIENvbnZlcnREZWNpbWFsVG9CaW5h cnkoaW50KTsNCg0KDQpXVHNlbnNvciAqc2Vuc29yOw0KV1R2aWV3cG9pbnQg Kk15VmlldzsNCkZMQUcgcXVpdCA9IEZBTFNFOw0KV1RzZXJpYWwqIHBNaWRp U2VyaWFsOw0KY2hhciBiaW5hcnlbOF09IiI7DQpjaGFyICpNaWRpRGF0YUlu Ow0KdW5zaWduZWQgY2hhciAqTWlkaURhdGFPdXQ7DQp1bnNpZ25lZCBpbnQg aU1lc3NhZ2VzV2FpdGluZzsNCnVuc2lnbmVkIHNob3J0IHNNZXNzYWdlc1Jl YWQ7DQpsb25nIGludCBnZXRiYXVkOw0KaW50IGJ5dGVzaXplOw0KDQoNCmlu dCBtYWluKCkNCnsNCg0KCVdUdW5pdmVyc2VfbmV3KFdURElTUExBWV9ERUZB VUxULCBXVFdJTkRPV19ERUZBVUxUKTsNCgkJDQoJV1Rub2RlICpSb290bm9k ZTsNCglSb290bm9kZSA9IFdUdW5pdmVyc2VfZ2V0cm9vdG5vZGVzKCk7DQoN CglXVGxpZ2h0bm9kZV9uZXdkaXJlY3RlZChSb290bm9kZSk7DQoNCglXVGtl eWJvYXJkX29wZW4oKTsNCglzZW5zb3I9IFdUbW91c2VfbmV3KCk7DQoJV1R1 bml2ZXJzZV9zZXRiZ3JnYigwLDAsMCk7DQoJV1R1bml2ZXJzZV9zZXRhY3Rp b25zKEFjdGlvbnMpOw0KCU15VmlldyA9V1R1bml2ZXJzZV9nZXR2aWV3cG9p bnRzKCk7DQoJV1R2aWV3cG9pbnRfYWRkc2Vuc29yKE15VmlldyxzZW5zb3Ip Ow0KDQoJcE1pZGlTZXJpYWwgPSBXVHNlcmlhbF9uZXcoU0VSSUFMMiwzODQw MCwnTicsOCwxLDY0KTsvL01VU1QgU0VUIEJBVUQgUkFURSBUTyBNQVRDSCAt IENPTlRST0wgUEFORUwvUE9SVFMvQ09NMi9CQVVEIFJBVEUNCglpZiAocE1p ZGlTZXJpYWwgPT1OVUxMKQ0KCQlXVG1lc3NhZ2UoInBNaWRpU2VyaWFsIGlu aXRpYWxpc2F0aW9uIGZhaWxlZFxuIik7DQoNCglXVHVuaXZlcnNlX3JlYWR5 KCk7DQoJV1R1bml2ZXJzZV9nbygpOw0KCVdUdW5pdmVyc2VfZGVsZXRlKCk7 DQoJcmV0dXJuIDA7DQoNCn0NCg0Kdm9pZCBBY3Rpb25zKCkNCnsNCglNaWRp KCk7DQoJS0JtZW51KCk7DQoJDQp9DQoNCg0Kdm9pZCBNaWRpKCkNCnsNCi8v CVVzZWQgdG8gY2hlY2sgaWYgdGhlcmUgaXMgZGF0YSB3YWl0aW5nIGF0IHRo ZSBzZXJpYWwgcG9ydAkNCi8vCUJVVCB0aGlzIHNlZW1zIGJsaW5kIHRvIGFu eSBkYXRhIGxlZnQgYmV0d2VlbiBjb2xsZWN0aW9uIGFuZCB3aGVuIGl0IHJ1 bnMgYWdhaW4NCi8vCXRoaXMgaXMgb25seSBwaWNrZWQgdXAgd2hlbiBhIHNl Y29uZCBiYXRjaCBvZiBkYXRhIGFycml2ZXMgYXQgdGhlIHBvcnQNCg0KLy8J aW50IEhvd01hbnlNZXNzYWdlcz0wOw0KCWNoYXIgRnVuY3Rpb25TdHJpbmcg WzY0XTsNCg0KLy8JdGhpcyB3YXMgcHJldmlvdXNseSB1c2VkIHRvIHNldCB0 aGUgc3RyaW5nIGxlbmd0aCBpbiBXVHNlcmlhbF9yZWFkDQoNCi8vCUhvd01h bnlNZXNzYWdlcyA9IFdUc2VyaWFsX250b3JlYWQocE1pZGlTZXJpYWwpOw0K Ly8JaWYoSG93TWFueU1lc3NhZ2VzIT0wKQ0KLy8Jew0KLy8JV1RtZXNzYWdl KCJcbkZsYWcgPSAlaSBcbiIsIEhvd01hbnlNZXNzYWdlcyk7DQovLwl9DQoN CgkvL25vdyB1c2luZyBhIHN0cmluZyB0aGUgc2l6ZSBvZiB0aGUgYnVmZmVy IGluIGFuIGF0dGVtcHQgdG8gcGljayB1cCB0aGlzIGRhdGENCg0KCU1pZGlE YXRhSW4gPSBGdW5jdGlvblN0cmluZzsNCglzTWVzc2FnZXNSZWFkID0gV1Rz ZXJpYWxfcmVhZChwTWlkaVNlcmlhbCxGdW5jdGlvblN0cmluZyw2NCxGQUxT RSk7DQoJDQoJaWYgKHNNZXNzYWdlc1JlYWQhPTApDQoJew0KCQlXVG1lc3Nh Z2UoIlxuc01lc3NhZ2VzUmVhZCA9ICVpIFxuIiwgc01lc3NhZ2VzUmVhZCk7 DQoJCWZvcih1bnNpZ25lZCBpbnQgRmlyc3RDb3VudGVyPTA7Rmlyc3RDb3Vu dGVyPHNNZXNzYWdlc1JlYWQ7Rmlyc3RDb3VudGVyKyspDQoJCXsJCQkNCgkJ CQlNaWRpRGF0YUluW0ZpcnN0Q291bnRlcl0gPSBGdW5jdGlvblN0cmluZ1tG aXJzdENvdW50ZXJdOw0KCQkJCXByaW50ZigiXG5jb3VudGVyWyVpXSBpczog XG4iLCBGaXJzdENvdW50ZXIpOw0KCQkJCXByaW50ZigiZGVjaW1hbDpcdCVp IiwgTWlkaURhdGFJbltGaXJzdENvdW50ZXJdKTsvL3JldHVybnMgYSB2YWx1 ZSB3aGljaCBpcyBpdHMgdmFsdWUNCgkJCQkJCQkJCQkJCQkJCQkvLyBzdWJ0 cmFjdGVkIGZyb20gMjU2IHdoZXJlIG1zYj0xDQoJCQkJQ29udmVydERlY2lt YWxUb0JpbmFyeSggTWlkaURhdGFJbltGaXJzdENvdW50ZXJdKTsNCgkJCQlw cmludGYoIlxuYmluYXJ5Olx0XHQlc1xuIixiaW5hcnkpOw0KCQl9DQoJCQ0K CX0NCn0NCg0Kdm9pZCBDb252ZXJ0RGVjaW1hbFRvQmluYXJ5KGludCB4KQ0K ew0KCWludCB0ZW1wPXg7DQoJZm9yIChpbnQgaT03O2k+PTA7aS0tKQ0KCXsN CgkJDQoJCWludCBtb2R1bHVzOw0KCQltb2R1bHVzPSB0ZW1wJTI7DQoJCWlm IChtb2R1bHVzPT0wKQ0KCQkJe2JpbmFyeSBbaV09NDg7DQoJCQl9ZWxzZXsN CgkJCWJpbmFyeSBbaV09NDk7fQ0KCQl0ZW1wPSB0ZW1wLzI7DQoJfQ0KfQ0K DQoNCnZvaWQgS0JtZW51KCkNCnsNCglzaG9ydCBLZXk7DQoNCglLZXkgPSBX VGtleWJvYXJkX2dldGxhc3RrZXkoKTsNCg0KDQoJc3dpdGNoKEtleSkNCgl7 DQoNCgkJY2FzZSAncSc6DQoJCWNhc2UgJ1EnOg0K CQkJcXVpdCA9IFRSVUU7DQoJCQlXVHVuaXZlcnNlX3N0b3AoKTsNCgkJCWJy ZWFrOw0KDQoJCWNhc2UgJ3onOg0KCQljYXNlICdaJzoNCgkJCVdUd2luZG93 ICpteVdpbmRvdzsgDQoJCQlteVdpbmRvdyA9IFdUdW5pdmVyc2VfZ2V0d2lu ZG93cygpOw0KCQkJV1R3aW5kb3dfem9vbXZpZXdwb2ludChteVdpbmRvdyk7 DQoJCWJyZWFrOwkNCgkJDQoJCWNhc2UgJ3cnOg0KCQljYXNlICdXJzoNCgkJ CVdUdW5pdmVyc2Vfc2V0cmVuZGVyaW5nKFdUUkVOREVSX1dJUkVGUkFNRSk7 DQoJCWJyZWFrOw0KDQoJCWNhc2UgJ2InOg0KCQljYXNlICdCJzoNCgkJCVdU dW5pdmVyc2Vfc2V0cmVuZGVyaW5nKFdUUkVOREVSX0JFU1QpOw0KCQlicmVh azsNCg0KCQljYXNlICcgJzoNCgkJCQkNCgkJCVdUbWVzc2FnZSgiTSBFIE4g VSBcblxuIik7DQoJCQlXVG1lc3NhZ2UoInEJLQlxdWl0XG4iKTsNCgkJCVdU bWVzc2FnZSgiegktCXpvb20gdmlld3BvaW50XG4iKTsNCgkJCVdUbWVzc2Fn ZSgidwktCXdpcmVmcmFtZVxuIik7DQoJCQlXVG1lc3NhZ2UoImIJLQliZXN0 IHNoYWRpbmdcbiIpOw0KCQkJV1RtZXNzYWdlKCJTcGFjZWJhcgktCU1lbnVc blxuIik7DQoJCWJyZWFrOw0KDQoJCQ0KCQljYXNlICdmJzoNCgkJY2FzZSAn Ric6DQoJCQlwcmludGYoIkZyYW1lcmF0ZTogJWZcbiIsIFdUdW5pdmVyc2Vf ZnJhbWVyYXRlKCkgKTsNCgkJYnJlYWs7DQoNCgkJY2FzZSAncyc6DQoJCWNh c2UgJ1MnOg0KCQkJV1Rub2RlX3ByaW50KFdUdW5pdmVyc2VfZ2V0cm9vdG5v ZGVzKCkpOw0KCQlicmVhazsNCg0KCWRlZmF1bHQ6DQoJCQ0KCQlicmVhazsN Cg0KCX0NCn0NCg== --Part10110051214.D-- -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics