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| + | == Description == |
| | | |
| MIDI devices are very easy to connect to DS via [[DSerial]]. MIDI Out can be directly wired to the connector without any components. MIDI In requires to use an [http://en.wikipedia.org/wiki/Optocoupler Optocoupler], but the schematic is quite simple. | | MIDI devices are very easy to connect to DS via [[DSerial]]. MIDI Out can be directly wired to the connector without any components. MIDI In requires to use an [http://en.wikipedia.org/wiki/Optocoupler Optocoupler], but the schematic is quite simple. |
Line 30: |
Line 30: |
| *[http://www.fairchildsemi.com/pf/FO/FOD260L.html FOD260L] optocoupler (3.3V, most other optocouplers are 5V...) | | *[http://www.fairchildsemi.com/pf/FO/FOD260L.html FOD260L] optocoupler (3.3V, most other optocouplers are 5V...) |
| *1N4148 switching diode | | *1N4148 switching diode |
− | *~1 kOhm resistor
| |
| *220 Ohm resistor. | | *220 Ohm resistor. |
| | | |
Latest revision as of 21:38, 9 September 2010
Description
MIDI devices are very easy to connect to DS via DSerial. MIDI Out can be directly wired to the connector without any components. MIDI In requires to use an Optocoupler, but the schematic is quite simple.
The signal lines should be connected to DSerial CMOS-level UART at IO2 connector (do not use RS-232). Sending and receiving is done using the UART commands. Make sure to set baud rate to 31250bps as this is what MIDI is using.
Here is some sample code to send a note:
<cpp>
void midiWrite(u8 message, u8 data1, u8 data2) {
u8 buffer[3];
buffer[0] = message;
buffer[1] = data1;
buffer[2] = data2;
dseUartSendBuffer((char *) buffer, 3, true); /* blocking UART send */
}
/* then somewhere else do: */
dseSetModes(0); /* Disable RS-232 */
dseUartSetBaudrate(31250); /* MIDI baudrate is 31250 bps */
midiWrite(0x90, 0x11, 0x22); /* send a note to MIDI keyboard */
</cpp>
Schematic
DSerial MIDI In/Out Schematic
Parts
- FOD260L optocoupler (3.3V, most other optocouplers are 5V...)
- 1N4148 switching diode
- 220 Ohm resistor.
Pictures
MIDI cables connected to DSerial
MIDI Input requires an Optocoupler IC
MIDI keyboard connected to DSerial
PCB