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— how_to_select_a_pic_id_header [2006/10/15 09:35] (current)
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 +The following boot options are controlled by the PIC ID header, which can be changed with IC-Prog before "​burning"​ the firmware:
 +
 +
 +
 +   - ID[57..63] : SysEx Device ID (0x00 - 0x7f)
 +
 +     ​choose a unique ID if you want to chain your MIDIboxes
 +
 +
 +
 +   - ID[55] ​ : if 0, UART will be initialized with common MIDI baudrate
 +
 +               if 1, UART will be initialized with 38200 baud
 +
 +               ​enable this setting your MIDIbox is connected via the
 +
 +               ​to-Host Interface (RS232) to your computer
 +
 +
 +
 +   - ID[48..51] : LCD type.
 +
 +                  Currently following LCDs are provided:
 +
 +                  0x0 : common character display
 +
 +                  0x1 : graphical LCD, KS0108 compatible
 +
 +                  0x2-0xf: reserved
 +
 +
 +
 +Examples:
 +
 +   ID = 0000000000000000 -> Device ID = 0x00
 +
 +                            common MIDI interface
 +
 +                            character LCD
 +
 +
 +
 +   ID = 0000000000000012 -> Device ID = 0x12
 +
 +                            common MIDI interface
 +
 +                            character LCD
 +
 +
 +
 +   ID = 0000000000000142 -> Device ID = 0x42
 +
 +                            to-Host Interface
 +
 +                            character LCD
 +
 +
 +
 +   ID = 0000000000001000 -> Device ID = 0x00
 +
 +                            common MIDI interface
 +
 +                            graphical LCD (KS0108)
 +
 +
 +
 +Note that the Bootstrap loader itself doesn'​t print a message on the LCD screen! After startup it requests a memory dump with the SysEx command: F0 00 00 7E 40  01 F7
 +
 +
 +
 +If no operating system is installed, the loader repeats the request every 2 seconds.
 +
 +
 +
 +During this time the converted dump file (*.syx) can be uploaded.
 +
 +
 +
 +IMPORTANT: since writing to flash memory requires some time, you've to use a SysEx loader which allows to insert delays after every
 +
 +F7 byte. Recommented tool: MIDI-Ox (http://​www.midiox.com)
 +
 +
 +
 +(Note: in difference to the PIC16F MIDIboxes, you don't have to specify an additional delay between every byte, only between every "F0 ... F7" block)
 +
 +
 +
 +The MIOS bootstrap loader can fetch up to 1k at once. Thereafter a delay of ca. 750 mS has to be inserted before sending the next data block. The "​hex2syx.pl"​ already takes care about this requirement by splitting the dump to 1k blocks.
 +
 +
 +
 +After the code has been uploaded (or the operating system is already in flash memory), you don't need to use the primary bootstrap loader anymore, unless you want to update MIOS.  Instead you will use the secondary bootstrap loader which is one of the background task of MIOS. This loader is similar to the primary one, but it prevents you from overwriting the operating system.
 +
 +
 +
 +Performance:​
 +
 +   - upload of MIOS (12k): 9 seconds
 +
 +   - upload of a typical application (4k): 3 seconds
 +
 +
 +
 +[Thorsten.Klose@gmx.de]
 +
  
how_to_select_a_pic_id_header.txt ยท Last modified: 2006/10/15 09:35 (external edit)

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